The master branch @ b042c4f0538c6f9cdf8efbcef552796851e38a85 fails to compile with GCC 14.2 and -D_GLIBCXX_DEBUG:
0$ cmake -B build -DCMAKE_CXX_FLAGS="-D_GLIBCXX_DEBUG"
1$ cmake --build build --target bitcoind
2[4/6] Building CXX object src/CMakeFiles/bitcoin_consensus.dir/pubkey.cpp.o
3FAILED: src/CMakeFiles/bitcoin_consensus.dir/pubkey.cpp.o
4/usr/bin/ccache /usr/bin/c++ -I/home/hebasto/git/bitcoin/build/src -I/home/hebasto/git/bitcoin/src -I/home/hebasto/git/bitcoin/src/secp256k1/include -D_GLIBCXX_DEBUG -O2 -g -std=c++20 -fPIC -fno-extended-identifiers -fdebug-prefix-map=/home/hebasto/git/bitcoin/src=. -fmacro-prefix-map=/home/hebasto/git/bitcoin/src=. -fstack-reuse=none -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 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -Wstack-protector -fstack-protector-all -fcf-protection=full -fstack-clash-protection -MD -MT src/CMakeFiles/bitcoin_consensus.dir/pubkey.cpp.o -MF src/CMakeFiles/bitcoin_consensus.dir/pubkey.cpp.o.d -o src/CMakeFiles/bitcoin_consensus.dir/pubkey.cpp.o -c /home/hebasto/git/bitcoin/src/pubkey.cpp
5In file included from /usr/include/c++/14/debug/debug.h:90,
6 from /usr/include/c++/14/bits/stl_algobase.h:69,
7 from /usr/include/c++/14/string:51,
8 from /home/hebasto/git/bitcoin/src/crypto/sha256.h:10,
9 from /home/hebasto/git/bitcoin/src/hash.h:12,
10 from /home/hebasto/git/bitcoin/src/pubkey.h:10,
11 from /home/hebasto/git/bitcoin/src/pubkey.cpp:6:
12/home/hebasto/git/bitcoin/src/pubkey.cpp:195:116: 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)80, (std::byte)146, (std::byte)155, (std::byte)116, (std::byte)193, (std::byte)160, (std::byte)73, (std::byte)84, (std::byte)183, (std::byte)139, (std::byte)75, (std::byte)96, (std::byte)53, (std::byte)233, (std::byte)122, (std::byte)94, (std::byte)7, (std::byte)138, (std::byte)90, (std::byte)15, (std::byte)40, (std::byte)236, (std::byte)150, (std::byte)213, (std::byte)71, (std::byte)191, (std::byte)238, (std::byte)154, (std::byte)206, (std::byte)128, (std::byte)58, (std::byte)192}}}>())’
13/usr/include/c++/14/span:202:57: 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)’
14/usr/include/c++/14/span:165:11: error: ‘__builtin_expect(((long int)(! __gnu_debug::__valid_range<const unsigned char*>(__first, (__first + ((sizetype)__count))))), 0)’ is not a constant expression
15 165 | __glibcxx_requires_valid_range(__first, __first + __count);
16 | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
17ninja: build stopped: subcommand failed.
The issue was introduced in 50bc017040ae300c795e3709233b80619db24518 from #30377.
