build: Require C++20 compiler #28349

maflcko commented at 8:56 AM on August 27, 2023: member

C++20 allows to write safer code, because it allows to enforce more stuff at compile time (constinit, conteval, constexpr, std::span, ...).

Also, it allows to write less verbose and easier to understand code (C++ 20 Concepts).

See #23363 and https://en.cppreference.com/w/cpp/compiler_support#cpp20

With g++-10 (https://github.com/bitcoin/bitcoin/pull/28348) and clang-13 (https://github.com/bitcoin/bitcoin/pull/28210), there is broad support for almost all features of C++20.

It should be fine to require a C++20 compiler for Bitcoin Core 27.0 in 2024 (next year), not the soon upcoming 26.0 next month.

This pull request includes three small cleanups to make use of C++20 features. If any issues are detected before or after merge, this should be easy to revert. If no issues arise, it should be fine to make use of more involved C++20 features later on.

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Conflicts

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#26593 (tracing: Only prepare tracepoint arguments when actually tracing by 0xB10C)

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DrahtBot renamed this:
~~build: Require C++20 compiler~~
build: Require C++20 compiler
on Aug 27, 2023

DrahtBot added the label Build system on Aug 27, 2023

maflcko commented at 9:01 AM on August 27, 2023: member

Not sure why CI fails. Does ./depends/ support C++20?

in src/test/fuzz/fuzz.cpp:74 in de8355cd12 outdated

  66 | @@ -67,7 +67,7 @@ auto& FuzzTargets()
  67 |  
  68 |  void FuzzFrameworkRegisterTarget(std::string_view name, TypeTestOneInput target, FuzzTargetOptions opts)
  69 |  {
  70 | -    const auto it_ins{FuzzTargets().try_emplace(name, FuzzTarget /* temporary can be dropped in C++20 */ {std::move(target), std::move(opts)})};
  71 | +    const auto it_ins{FuzzTargets().try_emplace(name, std::move(target), std::move(opts))};

maflcko commented at 9:30 AM on August 27, 2023:

https://github.com/bitcoin/bitcoin/actions/runs/5989963678/job/16246763442#step:7:2565

   CXX      test/fuzz/libtest_fuzz_a-fuzz.o
In file included from test/fuzz/fuzz.cpp:5:
In file included from ./test/fuzz/fuzz.h:8:
In file included from ./span.h:8:
In file included from /Applications/Xcode_14.2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/algorithm:653:
In file included from /Applications/Xcode_14.2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/functional:495:
In file included from /Applications/Xcode_14.2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/__functional/bind_front.h:14:
In file included from /Applications/Xcode_14.2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/__functional/perfect_forward.h:14:
/Applications/Xcode_14.2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/tuple:1522:7: error: no matching constructor for initialization of 'FuzzTarget'
      second(_VSTD::forward<_Args2>(_VSTD::get<_I2>(__second_args))...)
      ^      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Applications/Xcode_14.2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/__utility/pair.h:252:11: note: in instantiation of function template specialization 'std::pair<const std::string_view, FuzzTarget>::pair<const std::string_view &, std::function<void (Span<const unsigned char>)> &&, FuzzTargetOptions &&, 0UL, 0UL, 1UL>' requested here
        : pair(__pc, __first_args, __second_args,
          ^
/Applications/Xcode_14.2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/__memory/construct_at.h:37:38: note: in instantiation of function template specialization 'std::pair<const std::string_view, FuzzTarget>::pair<const std::string_view &, std::function<void (Span<const unsigned char>)> &&, FuzzTargetOptions &&>' requested here
    return ::new ((void*)__location) _Tp(_VSTD::forward<_Args>(__args)...);
                                     ^
/Applications/Xcode_14.2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/__memory/allocator_traits.h:298:16: note: in instantiation of function template specialization 'std::construct_at<std::pair<const std::string_view, FuzzTarget>, const std::piecewise_construct_t &, std::tuple<const std::string_view &>, std::tuple<std::function<void (Span<const unsigned char>)> &&, FuzzTargetOptions &&>, std::pair<const std::string_view, FuzzTarget> *>' requested here
        _VSTD::construct_at(__p, _VSTD::forward<_Args>(__args)...);
               ^
/Applications/Xcode_14.2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/__tree:2136:20: note: in instantiation of function template specialization 'std::allocator_traits<std::allocator<std::__tree_node<std::__value_type<std::string_view, FuzzTarget>, void *>>>::construct<std::pair<const std::string_view, FuzzTarget>, const std::piecewise_construct_t &, std::tuple<const std::string_view &>, std::tuple<std::function<void (Span<const unsigned char>)> &&, FuzzTargetOptions &&>, void, void>' requested here
    __node_traits::construct(__na, _NodeTypes::__get_ptr(__h->__value_), _VSTD::forward<_Args>(__args)...);
                   ^
/Applications/Xcode_14.2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/__tree:2098:29: note: in instantiation of function template specialization 'std::__tree<std::__value_type<std::string_view, FuzzTarget>, std::__map_value_compare<std::string_view, std::__value_type<std::string_view, FuzzTarget>, std::less<std::string_view>, true>, std::allocator<std::__value_type<std::string_view, FuzzTarget>>>::__construct_node<const std::piecewise_construct_t &, std::tuple<const std::string_view &>, std::tuple<std::function<void (Span<const unsigned char>)> &&, FuzzTargetOptions &&>>' requested here
        __node_holder __h = __construct_node(_VSTD::forward<_Args>(__args)...);
                            ^
/Applications/Xcode_14.2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/v1/map:1235:24: note: in instantiation of function template specialization 'std::__tree<std::__value_type<std::string_view, FuzzTarget>, std::__map_value_compare<std::string_view, std::__value_type<std::string_view, FuzzTarget>, std::less<std::string_view>, true>, std::allocator<std::__value_type<std::string_view, FuzzTarget>>>::__emplace_unique_key_args<std::string_view, const std::piecewise_construct_t &, std::tuple<const std::string_view &>, std::tuple<std::function<void (Span<const unsigned char>)> &&, FuzzTargetOptions &&>>' requested here
        return __tree_.__emplace_unique_key_args(__k,
                       ^
test/fuzz/fuzz.cpp:70:37: note: in instantiation of function template specialization 'std::map<std::string_view, FuzzTarget>::try_emplace<std::function<void (Span<const unsigned char>)>, FuzzTargetOptions>' requested here
    const auto it_ins{FuzzTargets().try_emplace(name, std::move(target), std::move(opts))};
                                    ^
test/fuzz/fuzz.cpp:57:8: note: candidate constructor (the implicit copy constructor) not viable: requires 1 argument, but 2 were provided
struct FuzzTarget {
       ^
test/fuzz/fuzz.cpp:57:8: note: candidate constructor (the implicit move constructor) not viable: requires 1 argument, but 2 were provided
test/fuzz/fuzz.cpp:57:8: note: candidate constructor (the implicit default constructor) not viable: requires 0 arguments, but 2 were provided
1 error generated.

fanquake commented at 10:40 AM on August 27, 2023:

I assume the problem here is that macOS is going to need a newer version of the SDK for (better) c++20 support

maflcko commented at 10:43 AM on August 27, 2023:

I am not sure if this even a C++20 feature, or something else: #28065 (review)

I guess I'll just drop it from this pull, unless someone with a macOS wants to spend time on this.

maflcko commented at 11:17 AM on October 3, 2023:

Looks like this also happens on Ubuntu clang-13, so I'll drop commit c3d6f193c806c9ec1bc052e228ae84af97af89e0 for now

DrahtBot added the label CI failed on Aug 27, 2023

hebasto commented at 12:58 PM on August 27, 2023: member

Not sure why CI fails. Does ./depends/ support C++20?

--- a/depends/Makefile
+++ b/depends/Makefile
@@ -49,7 +49,7 @@ NO_HARDEN ?=
 FALLBACK_DOWNLOAD_PATH ?= https://bitcoincore.org/depends-sources
 
 C_STANDARD ?= c11
-CXX_STANDARD ?= c++17
+CXX_STANDARD ?= c++20
 
 BUILD = $(shell ./config.guess)
 HOST ?= $(BUILD)

?

hebasto commented at 1:23 PM on August 27, 2023: member

https://cirrus-ci.com/task/5662608053764096:

g++: error: unrecognized command line option '-std=c++20'; did you mean '-std=c++2a'?

funny...

maflcko commented at 1:31 PM on August 27, 2023: member

Ok, looks like this is passing. The remaining errors should go away once and if this is rebased on the bump pull requests.

maflcko added the label Needs rebase on Aug 27, 2023

hebasto commented at 1:36 PM on August 27, 2023: member

cirrus-ci.com/task/5662608053764096:

g++: error: unrecognized command line option '-std=c++20'; did you mean '-std=c++2a'?

funny...

It seems we should require GCC >= 10 first. See: https://gcc.gnu.org/projects/cxx-status.html.

maflcko commented at 2:12 PM on August 27, 2023: member

It seems we should require GCC >= 10 first. See: https://gcc.gnu.org/projects/cxx-status.html.

Yes, I am aware, see the pull request description and my previous comment.

ajtowns commented at 3:00 PM on August 27, 2023: contributor

FWIW, I get a configure.ac error with clang 14 and libstdc++ 13 -- configure: error: cannot figure out how to use std::atomic. Seems to be due to clang not correctly implementing consteval prior to clang++-15. Using clang's libc++ (apt-get install libc++abi-dev libc++-dev and -stdlib=libc++) seems like it might fix it.

$ head -n31 build-aux/m4/l_atomic.m4  | tail -n19  > testing.cpp
$ clang++ -std=c++17 -stdlib=libc++ -o testing -Wall -W testing.cpp
$ clang++ -std=c++20 -stdlib=libc++ -o testing -Wall -W testing.cpp
$ clang++ -std=c++17 -o testing -Wall -W testing.cpp
$ clang++ -std=c++20 -o testing -Wall -W testing.cpp
In file included from testing.cpp:3:
/usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/chrono:2320:48: error: call to consteval function 'std::chrono::hh_mm_ss::_S_fractional_width' is not a constant expression
        static constexpr unsigned fractional_width = {_S_fractional_width()};
                                                      ^
/usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/chrono:2320:48: note: undefined function '_S_fractional_width' cannot be used in a constant expression
/usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/chrono:2275:2: note: declared here
        _S_fractional_width()
        ^
1 error generated.
$ clang++-15 -std=c++20 -o testing -Wall -W testing.cpp
$ clang++ --version
Debian clang version 14.0.6
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin

DrahtBot removed the label Needs rebase on Aug 27, 2023

maflcko commented at 3:12 PM on August 27, 2023: member

FWIW, I get a configure.ac error with clang 14 and libstdc++ 13

Ugh, that seems like a blocker, given that clang-14 seems still to be the default for the current Debian stable (https://packages.debian.org/bookworm/clang) and even trixie (for now).

configure: error: cannot figure out how to use std::atomic

If this was the only error, I wonder if it will go away with the cmake transition, or if we can work around it, but I doubt it and expect almost any code to fail to compile.

ajtowns commented at 4:19 PM on August 27, 2023: contributor

If this was the only error, I wonder if it will go away with the cmake transition, or if we can work around it, but I doubt it and expect almost any code to fail to compile.

I think it's specific to atomic<chrono::duration> as specified in parts of gcc's libstdc++ headers bracketed by #if c++20... Could just decide we're not going to use atomic<duration>.

ajtowns commented at 4:59 AM on August 28, 2023: contributor

If this was the only error, I wonder if it will go away with the cmake transition, or if we can work around it, but I doubt it and expect almost any code to fail to compile.

I think it's specific to atomic<chrono::duration> as specified in parts of gcc's libstdc++ headers bracketed by #if c++20... Could just decide we're not going to use atomic<duration>.

Ah, it's worse than that -- clang++-14 can't deal with libstdc++'s chrono header at all in c++20 mode.

$ cat testing.cpp
#include <chrono>
int main() { return 0; }
$ clang++-14 -std=c++20 -o testing -Wall -W testing.cpp
In file included from testing.cpp:1:
/usr/bin/../lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/chrono:2320:48: error: call to consteval function 'std::chrono::hh_mm_ss::_S_fractional_width' is not a constant expression
        static constexpr unsigned fractional_width = {_S_fractional_width()};

Using libc++ with CC=clang-14 CXX='env clang++-14 -stdlib=libc++' LDFLAGS='-stdlib=libc++' almost works, but Db::verify with clang's ostream isn't available for linking (using system libdb5.3++, not depends build):

/usr/bin/ld: libbitcoin_wallet.a(libbitcoin_wallet_a-bdb.o): in function `wallet::BerkeleyDatabase::Verify(bilingual_str&)':
./src/./src/wallet/bdb.cpp:327:(.text+0x3367): undefined reference to `Db::verify(char const*, char const*, std::__1::basic_ostream<char, std::__1::char_traits<char> >*, unsigned int)'

maflcko commented at 5:57 AM on August 28, 2023: member

Using libc++ with CC=clang-14 CXX='env clang++-14 -stdlib=libc++' LDFLAGS='-stdlib=libc++' almost works, but Db::verify with clang's ostream isn't available for linking (using system libdb5.3++, not depends build):

Yeah, that should be a known "issue", unrelated to C++20.

maflcko commented at 7:25 AM on August 28, 2023: member

Ah, it's worse than that -- clang++-14 can't deal with libstdc++'s chrono header at all in c++20 mode.

So to clarify, this is only a bug with clang++-14 and libstdc++-13? If so, the only operating system that ships with this config is Debian 13 Trixie, which is your operating system? If so, I'd suggest to just fix it upstream by bumping the default clang version in Debian.

ajtowns commented at 7:49 AM on August 28, 2023: contributor

Using libc++ with CC=clang-14 CXX='env clang++-14 -stdlib=libc++' LDFLAGS='-stdlib=libc++' almost works, but Db::verify with clang's ostream isn't available for linking (using system libdb5.3++, not depends build):

Yeah, that should be a known "issue", unrelated to C++20.

Yeah... I guess we could do C++20 with the following options on linux:

gcc 10 or above should be fine
clang 15 or above should be fine
clang 13/14 -- use libc++ and depends build of libdb++

Probably want an autoconf macro to check for the latter case?

maflcko commented at 7:54 AM on August 28, 2023: member

See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1050684

maflcko commented at 7:58 AM on August 28, 2023: member

clang 13/14 -- use libc++ and depends build of libdb++

Probably want an autoconf macro to check for the latter case?

Sgtm, but maybe check the status of the autoconf and bdb removal before spending time on this? :sweat_smile:

ajtowns commented at 12:14 PM on August 28, 2023: contributor

Ah, it's worse than that -- clang++-14 can't deal with libstdc++'s chrono header at all in c++20 mode.

So to clarify, this is only a bug with clang++-14 and libstdc++-13? If so, the only operating system that ships with this config is Debian 13 Trixie, which is your operating system? If so, I'd suggest to just fix it upstream by bumping the default clang version in Debian.

Yes, this seems correct! Seems like a non-problem then.

fanquake added this to the milestone 27.0 on Sep 26, 2023

fanquake commented at 1:54 PM on October 2, 2023: member

Our depends version of Qt is also going to be a blocker here. We'll need to move along to a more recent point release for improved C++20 support.

hebasto commented at 5:24 PM on October 2, 2023: member

Our depends version of Qt is also going to be a blocker here. We'll need to move along to a more recent point release for improved C++20 support.

Sorry if I missed something that was mentioned previously, but what is wrong in Qt 5.15.5 with C++20 support?

With this diff:

diff --git a/depends/Makefile b/depends/Makefile
index 3169117633..319c3498df 100644
--- a/depends/Makefile
+++ b/depends/Makefile
@@ -49,7 +49,7 @@ NO_HARDEN ?=
 FALLBACK_DOWNLOAD_PATH ?= https://bitcoincore.org/depends-sources
 
 C_STANDARD ?= c11
-CXX_STANDARD ?= c++17
+CXX_STANDARD ?= c++20
 
 BUILD = $(shell ./config.guess)
 HOST ?= $(BUILD)
diff --git a/depends/packages/qt.mk b/depends/packages/qt.mk
index 136ce32579..ef30878e65 100644
--- a/depends/packages/qt.mk
+++ b/depends/packages/qt.mk
@@ -39,7 +39,7 @@ $(package)_config_opts_release += -silent
 $(package)_config_opts_debug = -debug
 $(package)_config_opts_debug += -optimized-tools
 $(package)_config_opts += -bindir $(build_prefix)/bin
-$(package)_config_opts += -c++std c++17
+$(package)_config_opts += -c++std c++2a
 $(package)_config_opts += -confirm-license
 $(package)_config_opts += -hostprefix $(build_prefix)
 $(package)_config_opts += -no-compile-examples

everything compiles. Did not test cross-compiling, however.

A quick look at https://github.com/qt/qtbase/compare/v5.15.5-lts-lgpl..v5.15.10-lts-lgpl shows that support for C++23 has been added. But we are talking about C++20, right?

fanquake commented at 5:29 PM on October 2, 2023: member

Last I looked there were fixes since 5.15.5 that we needed, and things didn't work.

Did not test cross-compiling, however.

What do you mean by "everything"? Probably also worth checking cross-compilation before claiming it works?

hebasto commented at 5:31 PM on October 2, 2023: member

Last I looked there were fixes since 5.15.5 that we needed, and things didn't work.

Why not just sharing known steps to reproduce "things didn't work"?

fanquake commented at 5:33 PM on October 2, 2023: member

Because I tested it as part of a different change, months ago, and don't have a trivial reproducer on hand.

fanquake commented at 6:21 PM on October 2, 2023: member

With this diff: everything compiles.

The first thing I tested after applying your diff failed to compile. Master (fd8ab08558ccfb62f2d0a64d2d0d4dcefba977bc) + #28543 + the diff above:

Build type: macx-clang (x86_64, CPU features: cx16 mmx sse sse2 sse3 ssse3 sse4.1)
Compiler: clang (Apple) 15.0.0
Configuration: sse2 aesni sse3 ssse3 sse4_1 sse4_2 avx avx2 avx512f avx512bw avx512cd avx512dq avx512er avx512ifma avx512pf avx512vbmi avx512vl f16c largefile precompile_header rdrnd rdseed shani silent x86SimdAlways release c++11 c++14 c++17 c++1z c++2a reduce_exports static stl
Build options:
  Mode ................................... release
  Optimize release build for size ........ no
  Building shared libraries .............. no
  Using C standard ....................... C11
  Using C++ standard ..................... C++2a
  Using ccache ........................... no
<snip>
compiling ../../corelib/io/qdir.cpp
compiling ../../corelib/io/qdiriterator.cpp
../../corelib/global/qrandom.cpp:386:30: error: no member named 'is_literal_type' in namespace 'std'
        Q_STATIC_ASSERT(std::is_literal_type<SystemAndGlobalGenerators>::value);
                        ~~~~~^
../../../include/QtCore/../../src/corelib/global/qglobal.h:120:57: note: expanded from macro 'Q_STATIC_ASSERT'
#  define Q_STATIC_ASSERT(Condition) static_assert(bool(Condition), #Condition)
                                                        ^~~~~~~~~
../../corelib/global/qrandom.cpp:386:46: error: 'SystemAndGlobalGenerators' does not refer to a value
        Q_STATIC_ASSERT(std::is_literal_type<SystemAndGlobalGenerators>::value);
                                             ^
../../corelib/global/qrandom.cpp:350:26: note: declared here
struct QRandomGenerator::SystemAndGlobalGenerators
                         ^
../../corelib/global/qrandom.cpp:386:74: error: no member named 'value' in the global namespace
        Q_STATIC_ASSERT(std::is_literal_type<SystemAndGlobalGenerators>::value);
                                                                       ~~^
../../../include/QtCore/../../src/corelib/global/qglobal.h:120:57: note: expanded from macro 'Q_STATIC_ASSERT'
#  define Q_STATIC_ASSERT(Condition) static_assert(bool(Condition), #Condition)
                                                        ^~~~~~~~~
compiling ../../corelib/io/qfile.cpp
3 errors generated.

Looks like this was fixed upstream in https://github.com/qt/qtbase/commit/df08a21fa4e7139d46ec68bcf264c922789c4f3a, which we don't yet have until updating. Am I missing something?

maflcko commented at 8:22 AM on October 3, 2023: member

Is it required that qt is compiled under C++20 when Bitcoin Core (and other dependencies) are compiled under C++20?

If yes, I should probably include that patch hunk in this pull request?

fanquake commented at 8:32 AM on October 3, 2023: member

Is it required that qt is compiled under C++20 when Bitcoin Core (and other dependencies) are compiled under C++20?

Yes. We've always compiled our dependencies this way, and I can't see a reason to change that now.

maflcko force-pushed on Oct 3, 2023

maflcko commented at 8:41 AM on October 3, 2023: member

Is it required that qt is compiled under C++20 when Bitcoin Core (and other dependencies) are compiled under C++20?

Yes. We've always compiled our dependencies this way, and I can't see a reason to change that now.

Thanks, fixed.

in depends/packages/qt.mk:42 in aec17939a5 outdated

  38 | @@ -39,7 +39,7 @@ $(package)_config_opts_release += -silent
  39 |  $(package)_config_opts_debug = -debug
  40 |  $(package)_config_opts_debug += -optimized-tools
  41 |  $(package)_config_opts += -bindir $(build_prefix)/bin
  42 | -$(package)_config_opts += -c++std c++17
  43 | +$(package)_config_opts += -c++std c++20

hebasto commented at 9:04 AM on October 3, 2023:

$(package)_config_opts += -c++std c++2a

maflcko commented at 9:10 AM on October 3, 2023:

So I guess we'd need qt6 for the c++20 option: https://doc.qt.io/qt-6/qmake-variable-reference.html ?

maflcko force-pushed on Oct 3, 2023

maflcko commented at 12:04 PM on October 3, 2023: member

Could make sense to test this on macOS (depends) locally, to avoid re-introducing bugs similar to https://github.com/bitcoin/bitcoin/issues/28566

fanquake commented at 2:02 PM on October 3, 2023: member

If you wanted to see what else will break, could pull in the std::bit change: https://github.com/fanquake/bitcoin/commit/67af0da7ee57361860a435615f92c092db060018. Could also bump assumptions.h and/or start using starts_with in test/fuzz/rpc.cpp.

maflcko commented at 2:12 PM on October 3, 2023: member

Heh, my goal was to only touch the build system (and tests) here.

I presume testing the build system changes will be mostly different from testing the actual C++20 source code changes in production code.

Obviously no objection, if someone is including more changes when testing locally, but I think I'll keep the changes minimal here.

maflcko commented at 2:24 PM on October 3, 2023: member

Could also bump assumptions.h

Not sure what to bump it to. For some reason g++10 has 201709. https://godbolt.org/z/xbY1z4fGM

maflcko commented at 2:26 PM on October 3, 2023: member

start using starts_with in test/fuzz/rpc.cpp.

Thanks, done

fanquake commented at 2:51 PM on October 3, 2023: member

Not sure what to bump it to. For some reason g++10 has 201709. https://godbolt.org/z/xbY1z4fGM

Hmm. I guess we'll have to just take that value if we want to require c++20, but also support gcc 10. Looking at https://gcc.gnu.org/projects/cxx-status.html, it seems that most language features are implmented by 10.x.

It looks like the value was added to GCC 8, with the addition of c++20 features (https://github.com/gcc-mirror/gcc/commit/026a79f70cf33f836ea5275eda72d4870a3041e5), but then didn't actually get bumped to 202002 until GCC 11 (https://github.com/gcc-mirror/gcc/commit/445430e16bd08ade34637d2346ded40dd49de508), where it was "past time to update this macro".

maflcko commented at 3:17 PM on October 3, 2023: member

Hmm. I guess we'll have to just take that value

Happy to do that, but I wonder what the check does. The header compat/assumptions.h is not included anywhere, except for one file, where iwyu suggests to drop it.

Generally I think that assumptions should be put right next to the code that uses them.

I understand that there are assumptions that hold for all code, but then we should make sure to include the compilation blob at least once in a central part, for example libbitcoinkernel.

maflcko referenced this in commit 77774110f4 on Oct 4, 2023

maflcko commented at 9:30 AM on October 4, 2023: member

Fixed in https://github.com/bitcoin/bitcoin/pull/28579

fanquake referenced this in commit 30b3477507 on Oct 4, 2023

maflcko commented at 9:52 AM on October 5, 2023: member

Looks like CI fails with https://cirrus-ci.com/task/6671857634508800?logs=ci#L1949

Build failure. Verbose build follows.
+ make deploy V=1
Making all in src
make[1]: Entering directory '/ci_container_base/ci/scratch/build/bitcoin-x86_64-apple-darwin/src'
make[2]: Entering directory '/ci_container_base/ci/scratch/build/bitcoin-x86_64-apple-darwin/src'
/usr/bin/ccache env -u C_INCLUDE_PATH -u CPLUS_INCLUDE_PATH -u OBJC_INCLUDE_PATH -u OBJCPLUS_INCLUDE_PATH -u CPATH -u LIBRARY_PATH /ci_container_base/depends/x86_64-apple-darwin/native/bin/clang++ --target=x86_64-apple-darwin -mmacosx-version-min=11.0 -B/ci_container_base/depends/x86_64-apple-darwin/native/bin -mlinker-version=609 -isysroot/ci_container_base/depends/SDKs/Xcode-12.2-12B45b-extracted-SDK-with-libcxx-headers -nostdlibinc -iwithsysroot/usr/include/c++/v1 -iwithsysroot/usr/include -iframeworkwithsysroot/System/Library/Frameworks -std=c++20 -DHAVE_CONFIG_H -I. -I../src/config  -fmacro-prefix-map=/ci_container_base/ci/scratch/build/bitcoin-x86_64-apple-darwin=. -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -DHAVE_BUILD_INFO -DMAC_OSX -DOBJC_OLD_DISPATCH_PROTOTYPES=0 -DPROVIDE_FUZZ_MAIN_FUNCTION -I. -I./minisketch/include -I./secp256k1/include -I./univalue/include -I/ci_container_base/depends/x86_64-apple-darwin/include/  -fdebug-prefix-map=/ci_container_base/ci/scratch/build/bitcoin-x86_64-apple-darwin=. -Wstack-protector -fstack-protector-all -fcf-protection=full   -Werror    -fvisibility=hidden -fPIE -pipe -std=c++20 -O2  -c -o bitcoind-bitcoind.o `test -f 'bitcoind.cpp' || echo './'`bitcoind.cpp
In file included from bitcoind.cpp:12:
In file included from ./common/args.h:8:
In file included from ./common/settings.h:8:
./util/fs.h:75:12: error: no matching conversion for functional-style cast from 'std::u8string' (aka 'basic_string<char8_t>') to 'std::filesystem::path'
    return std::filesystem::path(std::u8string{utf8_str.begin(), utf8_str.end()});
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/ci_container_base/depends/SDKs/Xcode-12.2-12B45b-extracted-SDK-with-libcxx-headers/usr/include/c++/v1/filesystem:763:29: note: candidate constructor not viable: no known conversion from 'std::u8string' (aka 'basic_string<char8_t>') to 'const std::filesystem::path' for 1st argument
  _LIBCPP_INLINE_VISIBILITY path(const path& __p) : __pn_(__p.__pn_) {}
                            ^
/ci_container_base/depends/SDKs/Xcode-12.2-12B45b-extracted-SDK-with-libcxx-headers/usr/include/c++/v1/filesystem:764:29: note: candidate constructor not viable: no known conversion from 'std::u8string' (aka 'basic_string<char8_t>') to 'std::filesystem::path' for 1st argument
  _LIBCPP_INLINE_VISIBILITY path(path&& __p) noexcept
                            ^
/ci_container_base/depends/SDKs/Xcode-12.2-12B45b-extracted-SDK-with-libcxx-headers/usr/include/c++/v1/filesystem:768:3: note: candidate constructor not viable: no known conversion from 'basic_string<char8_t>' to 'basic_string<std::filesystem::path::value_type>' for 1st argument
  path(string_type&& __s, format = format::auto_format) noexcept
  ^
/ci_container_base/depends/SDKs/Xcode-12.2-12B45b-extracted-SDK-with-libcxx-headers/usr/include/c++/v1/filesystem:772:3: note: candidate template ignored: requirement '__is_pathable<std::basic_string<char8_t, std::char_traits<char8_t>, std::allocator<char8_t>>, false, false, false>::value' was not satisfied [with _Source = std::basic_string<char8_t>]
  path(const _Source& __src, format = format::auto_format) {
  ^
/ci_container_base/depends/SDKs/Xcode-12.2-12B45b-extracted-SDK-with-libcxx-headers/usr/include/c++/v1/filesystem:762:29: note: candidate constructor not viable: requires 0 arguments, but 1 was provided
  _LIBCPP_INLINE_VISIBILITY path() noexcept {}
                            ^
/ci_container_base/depends/SDKs/Xcode-12.2-12B45b-extracted-SDK-with-libcxx-headers/usr/include/c++/v1/filesystem:777:3: note: candidate constructor template not viable: requires at least 2 arguments, but 1 was provided
  path(_InputIt __first, _InputIt __last, format = format::auto_format) {
  ^
/ci_container_base/depends/SDKs/Xcode-12.2-12B45b-extracted-SDK-with-libcxx-headers/usr/include/c++/v1/filesystem:784:3: note: candidate constructor template not viable: requires at least 2 arguments, but 1 was provided
  path(const _Source& __src, const locale& __loc, format = format::auto_format);
  ^
/ci_container_base/depends/SDKs/Xcode-12.2-12B45b-extracted-SDK-with-libcxx-headers/usr/include/c++/v1/filesystem:786:3: note: candidate constructor template not viable: requires at least 3 arguments, but 1 was provided
  path(_InputIt __first, _InputIt _last, const locale& __loc,
  ^
1 error generated.
make[2]: *** [Makefile:16287: bitcoind-bitcoind.o] Error 1
make[2]: Leaving directory '/ci_container_base/ci/scratch/build/bitcoin-x86_64-apple-darwin/src'
make[1]: *** [Makefile:20150: all-recursive] Error 1
make[1]: Leaving directory '/ci_container_base/ci/scratch/build/bitcoin-x86_64-apple-darwin/src'
make: *** [Makefile:812: all-recursive] Error 1
Exit status: 2

fanquake commented at 12:31 PM on October 6, 2023: member

Looks like CI fails with

My assumption is that a newer version of the macOS SDK is going to be needed, probably from Xcode 14.3 or 15, as that is where most c++20 support has landed in Apples libc++ (We currently use the version from Xcode 12). Note that building this branch, using Xcode 15, targetting -mmacosx-version-min=11.0 work ok.

maflcko commented at 12:54 PM on October 6, 2023: member

Ah, thanks for taking a look. I presumed this was fixed by #28337, but I guess bumping the SDK will be needed as well.

PastaPastaPasta referenced this in commit 8c641f2dbe on Oct 6, 2023

Frank-GER referenced this in commit f0b8779803 on Oct 13, 2023

maflcko commented at 6:27 AM on October 25, 2023: member

Is it required that qt is compiled under C++20 when Bitcoin Core (and other dependencies) are compiled under C++20?

Yes. We've always compiled our dependencies this way, and I can't see a reason to change that now.

Thanks, fixed.

Looks like this results in a new error now. Steps to reproduce:

cd depends && make MULTIPROCESS=1 capnp -j $( nproc )

Output:

src/kj/string.h:238:67: warning: in C++20 this comparison calls the current function recursively with reversed arguments
  238 | inline bool operator==(const char* a, const String& b) { return b == a; }
      |                                                                 ~~^~~~

I wonder if this will be fixed by bumping capnp. Which could make sense independently of the changes here? cc @ryanofsky

ryanofsky commented at 12:51 PM on October 25, 2023: contributor

I wonder if this will be fixed by bumping capnp. Which could make sense independently of the changes here? cc @ryanofsky

I wouldn't say it makes sense independently of the changes here, but bumping would probably be easier than patching. The upstream fix is: https://github.com/capnproto/capnproto/commit/4b35480e18af80b9f0f0c3b9013c2e1ab6d5d7c2 which is pretty recent and only goes back to the 1.0 release, so probably just makes sense to bump to latest 1.01 release

maflcko commented at 12:57 PM on October 25, 2023: member

I wouldn't say it makes sense independently of the changes here

I think it makes sense independently for the following reasons:

debian is starting to ship this version in Trixie (https://packages.debian.org/trixie/capnproto), which will likely become the version shipped with Ubuntu 24.04 LTS, so testing with a more recent version in depends makes sense.
The feature is currently experimental, so bumping the version shouldn't cause any production issues.
With multiprocess begin a priority project for 27.0, it seems better to do build system changes/bumps early, rather than later, to allow for more time testing them.

maflcko commented at 11:46 AM on October 26, 2023: member

See https://github.com/bitcoin/bitcoin/pull/28735

maflcko added the label DrahtBot Guix build requested on Oct 26, 2023

DrahtBot commented at 6:30 PM on October 26, 2023: contributor

Guix builds (on x86_64)

File	commit cb8844e2b9d3ae3cae613c82683660f0fc5222d6<br>(master)	commit c785addb8b9911175818f4b8ae1546d6129a0406<br>(master and this pull)
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DrahtBot removed the label DrahtBot Guix build requested on Oct 26, 2023

PastaPastaPasta referenced this in commit c38071b663 on Oct 27, 2023

maflcko commented at 7:17 AM on October 31, 2023: member

Looks like configure doesn't detect g++-10 as a C++20 compiler, see https://cirrus-ci.com/task/5152770953576448?logs=ci#L5426 and #28349 (comment)

 | #ifndef __cplusplus
| 
| #error "This is not a C++ compiler"
| 
| #elif __cplusplus < 202002L
| 
| #error "This is not a C++20 compiler"
| 
| #else
| 
| #include <version>
| 
| namespace cxx20
| {
| 
| // As C++20 supports feature test macros in the standard, there is no
| // immediate need to actually test for feature availability on the
| // Autoconf side.
| 
| }  // namespace cxx20
| 
| #endif  // __cplusplus < 202002L
| 
| 
| 
configure:5613: result: no
configure:5637: error: *** A compiler with support for C++20 language features is required.

maflcko commented at 7:23 AM on October 31, 2023: member

I presume this will be fixed by cmake, so I'll just leave this in draft for now.

fanquake commented at 8:06 AM on October 31, 2023: member

CMake isn't ready yet, and we actually want C++20 first, to save porting over redundant code, just to delete it later.

Happy to take over this pull if you prefer.

maflcko commented at 4:56 PM on October 31, 2023: member

In any case, it is waiting on the macOS compile failure (Xcode?), so I can't really take it out of draft anyway.

maflcko force-pushed on Oct 31, 2023

maflcko added the label DrahtBot Guix build requested on Oct 31, 2023

maflcko force-pushed on Oct 31, 2023

maflcko commented at 8:16 PM on October 31, 2023: member

No idea what is wrong with Microsoft/Azure/GHA again. Locally it works fine, but not on their infra:

https://github.com/bitcoin/bitcoin/actions/runs/6711963492/job/18240509895?pr=28349#step:6:210

 checking whether clang is Clang... yes
checking whether pthreads work with "-pthread" and "-lpthread"... yes
checking whether Clang needs flag to prevent "argument unused" warning when linking with -pthread... no
checking for joinable pthread attribute... PTHREAD_CREATE_JOINABLE
checking whether more special flags are required for pthreads... no
checking for PTHREAD_PRIO_INHERIT... yes
checking whether std::atomic can be used without link library... no
checking whether std::atomic needs -latomic... no
configure: error: in `/home/runner/work/bitcoin/bitcoin':
configure: error: cannot figure out how to use std::atomic
See `config.log' for more details

maflcko force-pushed on Oct 31, 2023

DrahtBot commented at 3:45 AM on November 1, 2023: contributor

Guix builds (on x86_64)

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DrahtBot removed the label DrahtBot Guix build requested on Nov 1, 2023

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DrahtBot added the label Needs rebase on Nov 22, 2023

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DrahtBot removed the label Needs rebase on Nov 22, 2023

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PastaPastaPasta referenced this in commit 64c41d1f39 on Dec 6, 2023

PastaPastaPasta referenced this in commit bb1ecd4489 on Dec 7, 2023

fanquake closed this on Dec 7, 2023

maflcko reopened this on Dec 7, 2023

build: Require C++20 compiler fa67f096bd

refactor: modernize-use-default-member-init for bit-fields (C++20) fa02fc0a86

refactor: Drop unused _Pragma to ignore -Wgnu-zero-variadic-macro-arguments fae3b77a87

Revert "tracepoints: Disables `-Wgnu-zero-variadic-macro-arguments` to compile without warnings"

This reverts commit 5197660e947435e510ef3ef72be8be8dee3ffa41.

faa48388bc

fuzz: Use C++20 starts_with in rpc.cpp fa6e50d6c7

maflcko force-pushed on Dec 7, 2023

maflcko added the label DrahtBot Guix build requested on Dec 7, 2023

maflcko marked this as ready for review on Dec 7, 2023

maflcko commented at 10:08 AM on December 7, 2023: member

Rebased.

Once and if this is merged, I'll follow-up with a fs.h cleanup.

fanquake commented at 3:07 PM on December 7, 2023: member

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06fc6332a1e591da965c615f871386042b6f6b023cc7aa2a2f5ee459c247d257  guix-build-fa6e50d6c796/output/x86_64-w64-mingw32/bitcoin-fa6e50d6c796-win64-unsigned.tar.gz
8046be0ad76c90dd9fe63c8569cf2bfe7a8989cbf07843ff0c2920e87c17e7e9  guix-build-fa6e50d6c796/output/x86_64-w64-mingw32/bitcoin-fa6e50d6c796-win64.zip

PastaPastaPasta referenced this in commit db82ecbefe on Dec 7, 2023

maflcko commented at 3:22 PM on December 7, 2023: member

The benchmarks on https://corecheck.dev/bitcoin/bitcoin/pulls/28349 are grey ("normal"/expected)

DrahtBot commented at 7:32 PM on December 7, 2023: contributor

Guix builds (on x86_64)

File	commit dce1dfbc47050404bcf3ce2461e8baff0b088ffb<br>(master)	commit e3c53e43fd6f9b166c4888727e1595c76afe218e<br>(master and this pull)
SHA256SUMS.part	`d80bfdff781d89e3...`	`0af02ff57f0c6add...`
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DrahtBot removed the label DrahtBot Guix build requested on Dec 7, 2023

fanquake approved

fanquake commented at 11:18 AM on December 8, 2023: member

ACK fa6e50d6c79633e22ad4cfc75f56aaa40112ecbb

fanquake merged this on Dec 8, 2023

fanquake closed this on Dec 8, 2023

maflcko deleted the branch on Dec 8, 2023

0xB10C commented at 12:57 PM on December 8, 2023: contributor

post-merge ACK. Tested this on my NixOS setup. Configure and build works fine, unit tests pass. Reverting in faa48388bca06df1ca7ab92461b76a6720481e45 makes sense.

<details> <summary> I see a few `-Wmaybe-uninitialized` warnings not sure if they're related. </summary>

  CXX      policy/libbitcoin_common_a-feerate.o
In file included from ./hash.h:13,
                 from ./pubkey.h:10,
                 from ./addresstype.h:9,
                 from ./outputtype.h:9,
                 from outputtype.cpp:6:
In member function ‘bool prevector<N, T, Size, Diff>::is_direct() const [with unsigned int N = 28; T = unsigned char; Size = unsigned int; Diff = int]’,
    inlined from ‘prevector<N, T, Size, Diff>::~prevector() [with unsigned int N = 28; T = unsigned char; Size = unsigned int; Diff = int]’ at ./prevector.h:469:23,
    inlined from ‘CScript::~CScript()’ at ./script/script.h:413:7,
    inlined from ‘CNoDestination::~CNoDestination()’ at ./addresstype.h:18:7,
    inlined from ‘constexpr void std::destroy_at(_Tp*) [with _Tp = CNoDestination]’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/bits/stl_construct.h:88:18,
    inlined from ‘constexpr void std::_Destroy(_Tp*) [with _Tp = CNoDestination]’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/bits/stl_construct.h:149:22,
    inlined from ‘std::__detail::__variant::_Variant_storage<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::_M_reset()::<lambda(auto:19&&)> mutable [with auto:19 = CNoDestination&]’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/variant:472:19,
    inlined from ‘constexpr _Res std::__invoke_impl(__invoke_other, _Fn&&, _Args&& ...) [with _Res = void; _Fn = __detail::__variant::_Variant_storage<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::_M_reset()::<lambda(auto:19&&)>; _Args = {CNoDestination&}]’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/bits/invoke.h:61:36,
    inlined from ‘constexpr std::enable_if_t<is_invocable_r_v<_Res, _Callable, _Args ...>, _Res> std::__invoke_r(_Callable&&, _Args&& ...) [with _Res = void; _Callable = __detail::__variant::_Variant_storage<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::_M_reset()::<lambda(auto:19&&)>; _Args = {CNoDestination&}]’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/bits/invoke.h:111:28,
    inlined from ‘static constexpr decltype(auto) std::__detail::__variant::__gen_vtable_impl<std::__detail::__variant::_Multi_array<_Result_type (*)(_Visitor, _Variants ...)>, std::integer_sequence<long unsigned int, __indices ...> >::__visit_invoke(_Visitor&&, _Variants ...) [with _Result_type = void; _Visitor = std::__detail::__variant::_Variant_storage<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::_M_reset()::<lambda(auto:19&&)>&&; _Variants = {std::variant<CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>&}; long unsigned int ...__indices = {0}]’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/variant:1035:40,
    inlined from ‘constexpr decltype(auto) std::__do_visit(_Visitor&&, _Variants&& ...) [with _Result_type = void; _Visitor = __detail::__variant::_Variant_storage<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::_M_reset()::<lambda(auto:19&&)>; _Variants = {variant<CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>&}]’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/variant:1783:5,
    inlined from ‘constexpr decltype(auto) std::__do_visit(_Visitor&&, _Variants&& ...) [with _Result_type = void; _Visitor = __detail::__variant::_Variant_storage<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::_M_reset()::<lambda(auto:19&&)>; _Variants = {variant<CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>&}]’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/variant:1729:5,
    inlined from ‘constexpr void std::__detail::__variant::_Variant_storage<false, _Types ...>::_M_reset() [with _Types = {CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown}]’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/variant:470:23,
    inlined from ‘constexpr std::__detail::__variant::_Variant_storage<false, _Types ...>::~_Variant_storage() [with _Types = {CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown}]’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/variant:480:17,
    inlined from ‘constexpr std::__detail::__variant::_Copy_ctor_base<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::~_Copy_ctor_base()’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/variant:554:12,
    inlined from ‘constexpr std::__detail::__variant::_Move_ctor_base<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::~_Move_ctor_base()’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/variant:591:12,
    inlined from ‘constexpr std::__detail::__variant::_Copy_assign_base<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::~_Copy_assign_base()’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/variant:629:12,
    inlined from ‘constexpr std::__detail::__variant::_Move_assign_base<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::~_Move_assign_base()’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/variant:681:12,
    inlined from ‘constexpr std::__detail::__variant::_Variant_base<CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::~_Variant_base()’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/variant:735:12,
    inlined from ‘constexpr std::variant<_Types>::~variant() [with _Types = {CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown}]’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/variant:1407:28,
    inlined from ‘std::vector<std::variant<CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown> > GetAllDestinationsForKey(const CPubKey&)’ at outputtype.cpp:79:5:
./prevector.h:170:37: warning: ‘*(const prevector<28, unsigned char, unsigned int, int>*)((char*)&p2sh + offsetof(std::CTxDestination, std::variant<CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::<unnamed>.std::__detail::__variant::_Variant_base<CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::<unnamed>.std::__detail::__variant::_Move_assign_base<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::<unnamed>.std::__detail::__variant::_Copy_assign_base<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::<unnamed>.std::__detail::__variant::_Move_ctor_base<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::<unnamed>.std::__detail::__variant::_Copy_ctor_base<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::<unnamed>.std::__detail::__variant::_Variant_storage<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::_M_u)).prevector<28, unsigned char>::_size’ may be used uninitialized [-Wmaybe-uninitialized]
  170 |     bool is_direct() const { return _size <= N; }
      |                                     ^~~~~
outputtype.cpp: In function ‘std::vector<std::variant<CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown> > GetAllDestinationsForKey(const CPubKey&)’:
outputtype.cpp:77:24: note: ‘p2sh’ declared here
   77 |         CTxDestination p2sh = ScriptHash(GetScriptForDestination(segwit));
      |                        ^~~~
In file included from /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/vector:64,
                 from ./serialize.h:25,
                 from ./hash.h:14:
In destructor ‘constexpr std::_Vector_base<_Tp, _Alloc>::~_Vector_base() [with _Tp = unsigned char; _Alloc = std::allocator<unsigned char>]’,
    inlined from ‘constexpr std::vector<_Tp, _Alloc>::~vector() [with _Tp = unsigned char; _Alloc = std::allocator<unsigned char>]’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/bits/stl_vector.h:733:7,
    inlined from ‘constexpr WitnessUnknown::~WitnessUnknown()’ at ./addresstype.h:94:8,
    inlined from ‘constexpr void std::destroy_at(_Tp*) [with _Tp = WitnessUnknown]’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/bits/stl_construct.h:88:18,
    inlined from ‘constexpr void std::_Destroy(_Tp*) [with _Tp = WitnessUnknown]’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/bits/stl_construct.h:149:22,
    inlined from ‘std::__detail::__variant::_Variant_storage<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::_M_reset()::<lambda(auto:19&&)> mutable [with auto:19 = WitnessUnknown&]’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/variant:472:19,
    inlined from ‘constexpr _Res std::__invoke_impl(__invoke_other, _Fn&&, _Args&& ...) [with _Res = void; _Fn = __detail::__variant::_Variant_storage<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::_M_reset()::<lambda(auto:19&&)>; _Args = {WitnessUnknown&}]’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/bits/invoke.h:61:36,
    inlined from ‘constexpr std::enable_if_t<is_invocable_r_v<_Res, _Callable, _Args ...>, _Res> std::__invoke_r(_Callable&&, _Args&& ...) [with _Res = void; _Callable = __detail::__variant::_Variant_storage<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::_M_reset()::<lambda(auto:19&&)>; _Args = {WitnessUnknown&}]’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/bits/invoke.h:111:28,
    inlined from ‘static constexpr decltype(auto) std::__detail::__variant::__gen_vtable_impl<std::__detail::__variant::_Multi_array<_Result_type (*)(_Visitor, _Variants ...)>, std::integer_sequence<long unsigned int, __indices ...> >::__visit_invoke(_Visitor&&, _Variants ...) [with _Result_type = void; _Visitor = std::__detail::__variant::_Variant_storage<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::_M_reset()::<lambda(auto:19&&)>&&; _Variants = {std::variant<CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>&}; long unsigned int ...__indices = {7}]’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/variant:1035:40,
    inlined from ‘constexpr decltype(auto) std::__do_visit(_Visitor&&, _Variants&& ...) [with _Result_type = void; _Visitor = __detail::__variant::_Variant_storage<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::_M_reset()::<lambda(auto:19&&)>; _Variants = {variant<CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>&}]’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/variant:1790:5,
    inlined from ‘constexpr void std::__detail::__variant::_Variant_storage<false, _Types ...>::_M_reset() [with _Types = {CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown}]’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/variant:470:23,
    inlined from ‘constexpr std::__detail::__variant::_Variant_storage<false, _Types ...>::~_Variant_storage() [with _Types = {CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown}]’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/variant:480:17,
    inlined from ‘constexpr std::__detail::__variant::_Copy_ctor_base<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::~_Copy_ctor_base()’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/variant:554:12,
    inlined from ‘constexpr std::__detail::__variant::_Move_ctor_base<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::~_Move_ctor_base()’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/variant:591:12,
    inlined from ‘constexpr std::__detail::__variant::_Copy_assign_base<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::~_Copy_assign_base()’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/variant:629:12,
    inlined from ‘constexpr std::__detail::__variant::_Move_assign_base<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::~_Move_assign_base()’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/variant:681:12,
    inlined from ‘constexpr std::__detail::__variant::_Variant_base<CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::~_Variant_base()’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/variant:735:12,
    inlined from ‘constexpr std::variant<_Types>::~variant() [with _Types = {CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown}]’ at /nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/variant:1407:28,
    inlined from ‘std::vector<std::variant<CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown> > GetAllDestinationsForKey(const CPubKey&)’ at outputtype.cpp:79:5:
/nix/store/b7hvml0m3qmqraz1022fwvyyg6fc1vdy-gcc-12.2.0/include/c++/12.2.0/bits/stl_vector.h:367:31: warning: ‘*(std::_Vector_base<unsigned char, std::allocator<unsigned char> >*)((char*)&p2sh + offsetof(std::CTxDestination, std::variant<CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::<unnamed>.std::__detail::__variant::_Variant_base<CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::<unnamed>.std::__detail::__variant::_Move_assign_base<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::<unnamed>.std::__detail::__variant::_Copy_assign_base<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::<unnamed>.std::__detail::__variant::_Move_ctor_base<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::<unnamed>.std::__detail::__variant::_Copy_ctor_base<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::<unnamed>.std::__detail::__variant::_Variant_storage<false, CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown>::_M_u) + 8).std::_Vector_base<unsigned char, std::allocator<unsigned char> >::_M_impl.std::_Vector_base<unsigned char, std::allocator<unsigned char> >::_Vector_impl::<anonymous>.std::_Vector_base<unsigned char, std::allocator<unsigned char> >::_Vector_impl_data::_M_end_of_storage’ may be used uninitialized [-Wmaybe-uninitialized]
  367 |                       _M_impl._M_end_of_storage - _M_impl._M_start);
      |                       ~~~~~~~~^~~~~~~~~~~~~~~~~
outputtype.cpp: In function ‘std::vector<std::variant<CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, WitnessUnknown> > GetAllDestinationsForKey(const CPubKey&)’:
outputtype.cpp:77:24: note: ‘p2sh’ declared here
   77 |         CTxDestination p2sh = ScriptHash(GetScriptForDestination(segwit));
      |                        ^~~~

</details>

TheCharlatan commented at 3:23 PM on December 8, 2023: contributor

Post-merge ACK.

hebasto commented at 8:53 PM on December 8, 2023: member

Looks like configure doesn't detect g++-10 as a C++20 compiler...

I presume this will be fixed by cmake...

It does :)

fanquake commented at 9:02 PM on December 8, 2023: member

Isn't it just applying the exact same workaround (internally) that we are using? There's no other way to know that GCC supports C++20, because of the bug we discussed above.

hebasto commented at 9:14 PM on December 8, 2023: member

Isn't it just applying the exact same workaround (internally) that we are using? There's no other way to know that GCC supports C++20, because of the bug we discussed above.

I didn't look into CMake code for that. I only tested it, including the minimum supported CMake 3.16.

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theuni commented at 4:33 PM on March 1, 2024: member

This needs a release note imo.

fanquake added the label Needs release note on Mar 1, 2024

fanquake removed the label Needs release note on Mar 4, 2024

fanquake commented at 11:57 AM on March 4, 2024: member

Added rel-note todo to the draft wiki.

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