refactor: Use immediate lambda to work around GCC bug 117966

hebasto commented at 11:16 am on August 1, 2025: member

This PR is a follow-up to the recently merged #31244, and provides a workaround for affected GCC compilers, similar to #31493.

Without this workaround, building the master branch using GCC 13 or 14 with the -D_GLIBCXX_DEBUG flag fails with the following error:

 0$ cmake -B build -DAPPEND_CPPFLAGS="-D_GLIBCXX_DEBUG"
 1-- The CXX compiler identification is GNU 13.3.0
 2<snip>
 3$ cmake --build build
 4[2/10] Building CXX object src/CMakeFiles/bitcoin_common.dir/musig.cpp.o
 5FAILED: src/CMakeFiles/bitcoin_common.dir/musig.cpp.o 
 6/usr/bin/ccache /usr/bin/c++ -DBOOST_MULTI_INDEX_DISABLE_SERIALIZATION -DBOOST_NO_CXX98_FUNCTION_BASE -I/home/hebasto/dev/bitcoin/build/src -I/home/hebasto/dev/bitcoin/src -I/home/hebasto/dev/bitcoin/src/univalue/include -I/home/hebasto/dev/bitcoin/src/secp256k1/include -O2 -g -std=c++20 -fPIC -fno-extended-identifiers -fdebug-prefix-map=/home/hebasto/dev/bitcoin/src=. -fmacro-prefix-map=/home/hebasto/dev/bitcoin/src=. -fstack-reuse=none -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -Wstack-protector -fstack-protector-all -fcf-protection=full -fstack-clash-protection -Wall -Wextra -Wformat -Wformat-security -Wvla -Wredundant-decls -Wdate-time -Wduplicated-branches -Wduplicated-cond -Wlogical-op -Woverloaded-virtual -Wsuggest-override -Wimplicit-fallthrough -Wunreachable-code -Wbidi-chars=any -Wundef -Wno-unused-parameter -MD -MT src/CMakeFiles/bitcoin_common.dir/musig.cpp.o -MF src/CMakeFiles/bitcoin_common.dir/musig.cpp.o.d -o src/CMakeFiles/bitcoin_common.dir/musig.cpp.o -c /home/hebasto/dev/bitcoin/src/musig.cpp -D_GLIBCXX_DEBUG
 7In file included from /usr/include/c++/13/debug/stl_iterator.h:32,
 8                 from /usr/include/c++/13/bits/stl_iterator.h:3003,
 9                 from /usr/include/c++/13/string:48,
10                 from ../src/crypto/sha256.h:10,
11                 from ../src/hash.h:12,
12                 from ../src/pubkey.h:10,
13                 from ../src/musig.h:8,
14                 from ../src/musig.cpp:5:
15../src/musig.h:17:108:   in ‘constexpr’ expansion of ‘std::span<const unsigned char>(util::hex_literals::operator""_hex_u8<util::detail::Hex<65>{std::array<std::byte, 32>{std::__array_traits<std::byte, 32>::_Type{(std::byte)134, (std::byte)128, (std::byte)135, (std::byte)202, (std::byte)2, (std::byte)166, (std::byte)249, (std::byte)116, (std::byte)196, (std::byte)89, (std::byte)137, (std::byte)36, (std::byte)195, (std::byte)107, (std::byte)87, (std::byte)118, (std::byte)45, (std::byte)50, (std::byte)203, (std::byte)69, (std::byte)113, (std::byte)113, (std::byte)103, (std::byte)227, (std::byte)0, (std::byte)98, (std::byte)44, (std::byte)113, (std::byte)103, (std::byte)227, (std::byte)137, (std::byte)101}}}>())’
16/usr/include/c++/13/span:204:57:   in ‘constexpr’ expansion of ‘((std::span<const unsigned char>*)this)->std::span<const unsigned char>::span<const unsigned char*>((& __arr)->std::array<unsigned char, 32>::data(), 32)’
17/usr/include/c++/13/span:167:4:   in ‘constexpr’ expansion of ‘__gnu_debug::__valid_range<const unsigned char*>(__first, (__first + ((sizetype)__count)))’
18/usr/include/c++/13/debug/helper_functions.h:267:44:   in ‘constexpr’ expansion of ‘__gnu_debug::__valid_range_aux<const unsigned char*>(__first, __last, (_Integral(), _Integral()))’
19/usr/include/c++/13/debug/helper_functions.h:197:44:   in ‘constexpr’ expansion of ‘__gnu_debug::__valid_range_aux<const unsigned char*>(__first, __last, (std::__iterator_category<const unsigned char*>(__first), std::iterator_traits<const unsigned char*>::iterator_category()))’
20/usr/include/c++/13/debug/helper_functions.h:183:44:   in ‘constexpr’ expansion of ‘__gnu_debug::__valid_range_aux<const unsigned char*>(__first, __last, (std::input_iterator_tag(), std::input_iterator_tag()))’
21/usr/include/c++/13/debug/helper_functions.h:143:20: error: ‘(((const unsigned char*)(&<anonymous>.std::array<unsigned char, 32>::_M_elems)) == 0)’ is not a constant expression
22  143 |     { return __ptr == 0; }
23      |              ~~~~~~^~~~
24[3/10] Building CXX object src/CMakeFiles/bitcoin_common.dir/script/descriptor.cpp.o
25FAILED: src/CMakeFiles/bitcoin_common.dir/script/descriptor.cpp.o 
26/usr/bin/ccache /usr/bin/c++ -DBOOST_MULTI_INDEX_DISABLE_SERIALIZATION -DBOOST_NO_CXX98_FUNCTION_BASE -I/home/hebasto/dev/bitcoin/build/src -I/home/hebasto/dev/bitcoin/src -I/home/hebasto/dev/bitcoin/src/univalue/include -I/home/hebasto/dev/bitcoin/src/secp256k1/include -O2 -g -std=c++20 -fPIC -fno-extended-identifiers -fdebug-prefix-map=/home/hebasto/dev/bitcoin/src=. -fmacro-prefix-map=/home/hebasto/dev/bitcoin/src=. -fstack-reuse=none -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -Wstack-protector -fstack-protector-all -fcf-protection=full -fstack-clash-protection -Wall -Wextra -Wformat -Wformat-security -Wvla -Wredundant-decls -Wdate-time -Wduplicated-branches -Wduplicated-cond -Wlogical-op -Woverloaded-virtual -Wsuggest-override -Wimplicit-fallthrough -Wunreachable-code -Wbidi-chars=any -Wundef -Wno-unused-parameter -MD -MT src/CMakeFiles/bitcoin_common.dir/script/descriptor.cpp.o -MF src/CMakeFiles/bitcoin_common.dir/script/descriptor.cpp.o.d -o src/CMakeFiles/bitcoin_common.dir/script/descriptor.cpp.o -c /home/hebasto/dev/bitcoin/src/script/descriptor.cpp -D_GLIBCXX_DEBUG
27In file included from /usr/include/c++/13/debug/stl_iterator.h:32,
28                 from /usr/include/c++/13/bits/stl_iterator.h:3003,
29                 from /usr/include/c++/13/string:48,
30                 from ../src/crypto/sha256.h:10,
31                 from ../src/hash.h:12,
32                 from ../src/pubkey.h:10,
33                 from ../src/addresstype.h:9,
34                 from ../src/outputtype.h:9,
35                 from ../src/script/descriptor.h:8,
36                 from ../src/script/descriptor.cpp:5:
37../src/musig.h:17:108:   in ‘constexpr’ expansion of ‘std::span<const unsigned char>(util::hex_literals::operator""_hex_u8<util::detail::Hex<65>{std::array<std::byte, 32>{std::__array_traits<std::byte, 32>::_Type{(std::byte)134, (std::byte)128, (std::byte)135, (std::byte)202, (std::byte)2, (std::byte)166, (std::byte)249, (std::byte)116, (std::byte)196, (std::byte)89, (std::byte)137, (std::byte)36, (std::byte)195, (std::byte)107, (std::byte)87, (std::byte)118, (std::byte)45, (std::byte)50, (std::byte)203, (std::byte)69, (std::byte)113, (std::byte)113, (std::byte)103, (std::byte)227, (std::byte)0, (std::byte)98, (std::byte)44, (std::byte)113, (std::byte)103, (std::byte)227, (std::byte)137, (std::byte)101}}}>())’
38/usr/include/c++/13/span:204:57:   in ‘constexpr’ expansion of ‘((std::span<const unsigned char>*)this)->std::span<const unsigned char>::span<const unsigned char*>((& __arr)->std::array<unsigned char, 32>::data(), 32)’
39/usr/include/c++/13/span:167:4:   in ‘constexpr’ expansion of ‘__gnu_debug::__valid_range<const unsigned char*>(__first, (__first + ((sizetype)__count)))’
40/usr/include/c++/13/debug/helper_functions.h:267:44:   in ‘constexpr’ expansion of ‘__gnu_debug::__valid_range_aux<const unsigned char*>(__first, __last, (_Integral(), _Integral()))’
41/usr/include/c++/13/debug/helper_functions.h:197:44:   in ‘constexpr’ expansion of ‘__gnu_debug::__valid_range_aux<const unsigned char*>(__first, __last, (std::__iterator_category<const unsigned char*>(__first), std::iterator_traits<const unsigned char*>::iterator_category()))’
42/usr/include/c++/13/debug/helper_functions.h:183:44:   in ‘constexpr’ expansion of ‘__gnu_debug::__valid_range_aux<const unsigned char*>(__first, __last, (std::input_iterator_tag(), std::input_iterator_tag()))’
43/usr/include/c++/13/debug/helper_functions.h:143:20: error: ‘(((const unsigned char*)(&<anonymous>.std::array<unsigned char, 32>::_M_elems)) == 0)’ is not a constant expression
44  143 |     { return __ptr == 0; }
45      |              ~~~~~~^~~~
46ninja: build stopped: subcommand failed.

refactor: Use immediate lambda to work around GCC bug 117966 a7bafb3e05

hebasto added the label Refactoring on Aug 1, 2025

DrahtBot commented at 11:16 am on August 1, 2025: contributor

The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

Code Coverage & Benchmarks

For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/33113.

Reviews

See the guideline for information on the review process.

Type	Reviewers
ACK	achow101

If your review is incorrectly listed, please react with 👎 to this comment and the bot will ignore it on the next update.

maflcko commented at 11:32 am on August 1, 2025: member

Seems fine, but it can’t hurt to enforce it in CI again?

 0
 1
 2
 3
 4    ci: Re-enable DEBUG=1 in centos task
 5    
 6    This reverts the workaround in commit fa079538e32d20aec6786c93e1117da1e8ea0cab, as it is no longer needed.
 7
 8diff --git a/ci/test/00_setup_env_native_centos.sh b/ci/test/00_setup_env_native_centos.sh
 9index 25b9923dc7..94002b6349 100755
10--- a/ci/test/00_setup_env_native_centos.sh
11+++ b/ci/test/00_setup_env_native_centos.sh
12@@ -10,11 +10,11 @@ export CONTAINER_NAME=ci_native_centos
13 export CI_IMAGE_NAME_TAG="quay.io/centos/centos:stream10"
14 export CI_BASE_PACKAGES="gcc-c++ glibc-devel libstdc++-devel ccache make ninja-build git python3 python3-pip which patch xz procps-ng ksh rsync coreutils bison e2fsprogs cmake"
15 export PIP_PACKAGES="pyzmq"
16+export DEP_OPTS="DEBUG=1"
17 export GOAL="install"
18 export BITCOIN_CONFIG="\
19  -DWITH_ZMQ=ON \
20  -DBUILD_GUI=ON \
21  -DREDUCE_EXPORTS=ON \
22- -DAPPEND_CPPFLAGS='-D_GLIBCXX_ASSERTIONS' \
23  -DCMAKE_BUILD_TYPE=Debug \
24 "

Extra runtime seems to be 3 minutes, which seems fine?

ci: Re-enable DEBUG=1 in centos task

This reverts the workaround in commit fa079538e32d20aec6786c93e1117da1e8ea0cab, as it is no longer needed.

c7a24c3052

hebasto commented at 4:20 pm on August 1, 2025: member

Seems fine, but it can’t hurt to enforce it in CI again?

 0    ci: Re-enable DEBUG=1 in centos task
 1    
 2    This reverts the workaround in commit fa079538e32d20aec6786c93e1117da1e8ea0cab, as it is no longer needed.
 3
 4diff --git a/ci/test/00_setup_env_native_centos.sh b/ci/test/00_setup_env_native_centos.sh
 5index 25b9923dc7..94002b6349 100755
 6--- a/ci/test/00_setup_env_native_centos.sh
 7+++ b/ci/test/00_setup_env_native_centos.sh
 8@@ -10,11 +10,11 @@ export CONTAINER_NAME=ci_native_centos
 9 export CI_IMAGE_NAME_TAG="quay.io/centos/centos:stream10"
10 export CI_BASE_PACKAGES="gcc-c++ glibc-devel libstdc++-devel ccache make ninja-build git python3 python3-pip which patch xz procps-ng ksh rsync coreutils bison e2fsprogs cmake"
11 export PIP_PACKAGES="pyzmq"
12+export DEP_OPTS="DEBUG=1"
13 export GOAL="install"
14 export BITCOIN_CONFIG="\
15  -DWITH_ZMQ=ON \
16  -DBUILD_GUI=ON \
17  -DREDUCE_EXPORTS=ON \
18- -DAPPEND_CPPFLAGS='-D_GLIBCXX_ASSERTIONS' \
19  -DCMAKE_BUILD_TYPE=Debug \
20 "

Extra runtime seems to be 3 minutes, which seems fine?

Thanks! Your changes have been added.

achow101 commented at 10:49 pm on August 1, 2025: member

ACK c7a24c3052557c4747eb8be7c40ee0a30e6b137d

fanquake merged this on Aug 6, 2025

fanquake closed this on Aug 6, 2025

hebasto deleted the branch on Aug 6, 2025

refactor: Use immediate lambda to work around GCC bug 117966 #33113

Code Coverage & Benchmarks

Reviews