Build regression with GCC 14 when moving to libmamba 2.0.4

[dannf]

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maybe-uninitialized

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libmamba 2.0.4 no longer builds with GCC 14, as observed using wolfi-os's toolchain. See the error below. This is a regression from 2.0.3, and was introduced by commit 0a8128d. Of course, we can work around this by adding -Wno-error=maybe-uninitialized to CXXFLAGS. But perhaps this should be added upstream so that each impacted downstream needn't work around this independently.

2024/12/08 15:35:57 WARN ninja: job failed: /usr/local/bin/c++ -DFMT_SHARED -DLIBMAMBA_EXPORTS -DMAMBA_USE_INSTALL_PREFIX_AS_BASE -DSIMDJSON_THREADS_ENABLED=1 -DSPDLOG_ACTIVE_LEVEL=SPDLOG_LEVEL_TRACE -DSPDLOG_FMT_EXTERNAL -Dlibmamba_dyn_EXPORTS -I/home/build/libmamba/include -I/home/build/libmamba/src -I/home/build/libmamba/ext/solv-cpp/include -isystem /usr/share -fPIC -O3 -DNDEBUG -fPIC -Wall -Wextra -Wshadow -Wnon-virtual-dtor -Wold-style-cast -Wcast-align -Wunused -Woverloaded-virtual -Wpedantic -Wconversion -Wsign-conversion -Wnull-dereference -Wdouble-promotion -Wformat=2 -Wunreachable-code -Wuninitialized -Werror -Wmisleading-indentation -Wduplicated-cond -Wduplicated-branches -Wlogical-op -Wuseless-cast -MD -MT libmamba/CMakeFiles/libmamba-dyn.dir/src/download/curl.cpp.o -MF libmamba/CMakeFiles/libmamba-dyn.dir/src/download/curl.cpp.o.d -o libmamba/CMakeFiles/libmamba-dyn.dir/src/download/curl.cpp.o -c /home/build/libmamba/src/download/curl.cpp uses=cmake/build
2024/12/08 15:35:57 INFO     inlined from 'void std::iter_swap(_ForwardIterator1, _ForwardIterator2) [with _ForwardIterator1 = char*; _ForwardIterator2 = char*]' at /usr/include/c++/14/bits/stl_algobase.h:185:11, uses=cmake/build
2024/12/08 15:35:57 INFO     inlined from '_ForwardIterator2 std::swap_ranges(_ForwardIterator1, _ForwardIterator1, _ForwardIterator2) [with _ForwardIterator1 = char*; _ForwardIterator2 = char*]' at /usr/include/c++/14/bits/stl_algobase.h:215:16, uses=cmake/build
2024/12/08 15:35:57 INFO     inlined from 'void std::array<_Tp, _Nm>::swap(std::array<_Tp, _Nm>&) [with _Tp = char; long unsigned int _Nm = 256]' at /usr/include/c++/14/array:127:25, uses=cmake/build
2024/12/08 15:35:57 INFO     inlined from 'std::__enable_if_t<((bool)typename std::__array_traits<_Tp, _Nm>::_Is_swappable::value)> std::swap(array<_Tp, _Nm>&, array<_Tp, _Nm>&) [with _Tp = char; long unsigned int _Nm = 256]' at /usr/include/c++/14/array:379:17, uses=cmake/build
2024/12/08 15:35:57 INFO     inlined from 'mamba::download::CURLHandle::CURLHandle(mamba::download::CURLHandle&&)' at /home/build/libmamba/src/download/curl.cpp:253:18: uses=cmake/build
2024/12/08 15:35:57 INFO /usr/include/c++/14/bits/move.h:221:11: error: '((__vector(16) char*)this)[1]' may be used uninitialized [-Werror=maybe-uninitialized] uses=cmake/build
2024/12/08 15:35:57 INFO   221 |       _Tp __tmp = _GLIBCXX_MOVE(__a); uses=cmake/build
2024/12/08 15:35:57 INFO       |           ^~~~~ uses=cmake/build
2024/12/08 15:35:57 INFO /usr/include/c++/14/bits/move.h:221:11: error: '((__vector(16) char*)this)[2]' may be used uninitialized [-Werror=maybe-uninitialized] uses=cmake/build
2024/12/08 15:35:57 INFO /usr/include/c++/14/bits/move.h:221:11: error: '((__vector(16) char*)this)[3]' may be used uninitialized [-Werror=maybe-uninitialized] uses=cmake/build
2024/12/08 15:35:57 INFO /usr/include/c++/14/bits/move.h:221:11: error: '((__vector(16) char*)this)[4]' may be used uninitialized [-Werror=maybe-uninitialized] uses=cmake/build
2024/12/08 15:35:57 INFO /usr/include/c++/14/bits/move.h:221:11: error: '((__vector(16) char*)this)[5]' may be used uninitialized [-Werror=maybe-uninitialized] uses=cmake/build
2024/12/08 15:35:57 INFO /usr/include/c++/14/bits/move.h:221:11: error: '((__vector(16) char*)this)[6]' may be used uninitialized [-Werror=maybe-uninitialized] uses=cmake/build
2024/12/08 15:35:57 INFO /usr/include/c++/14/bits/move.h:221:11: error: '((__vector(16) char*)this)[7]' may be used uninitialized [-Werror=maybe-uninitialized] uses=cmake/build
2024/12/08 15:35:57 INFO /usr/include/c++/14/bits/move.h:221:11: error: '((__vector(16) char*)this)[8]' may be used uninitialized [-Werror=maybe-uninitialized] uses=cmake/build
2024/12/08 15:35:57 INFO /usr/include/c++/14/bits/move.h:221:11: error: '((__vector(16) char*)this)[9]' may be used uninitialized [-Werror=maybe-uninitialized] uses=cmake/build
2024/12/08 15:35:57 INFO /usr/include/c++/14/bits/move.h:221:11: error: '((__vector(16) char*)this)[10]' may be used uninitialized [-Werror=maybe-uninitialized] uses=cmake/build
2024/12/08 15:35:57 INFO /usr/include/c++/14/bits/move.h:221:11: error: '((__vector(16) char*)this)[11]' may be used uninitialized [-Werror=maybe-uninitialized] uses=cmake/build
2024/12/08 15:35:57 INFO /usr/include/c++/14/bits/move.h:221:11: error: '((__vector(16) char*)this)[12]' may be used uninitialized [-Werror=maybe-uninitialized] uses=cmake/build
2024/12/08 15:35:57 INFO /usr/include/c++/14/bits/move.h:221:11: error: '((__vector(16) char*)this)[13]' may be used uninitialized [-Werror=maybe-uninitialized] uses=cmake/build
2024/12/08 15:35:57 INFO /usr/include/c++/14/bits/move.h:221:11: error: '((__vector(16) char*)this)[14]' may be used uninitialized [-Werror=maybe-uninitialized] uses=cmake/build
2024/12/08 15:35:57 INFO /usr/include/c++/14/bits/move.h:221:11: error: '((__vector(16) char*)this)[15]' may be used uninitialized [-Werror=maybe-uninitialized] uses=cmake/build
2024/12/08 15:35:57 INFO /usr/include/c++/14/bits/move.h:221:11: error: '((__vector(16) char*)this)[16]' may be used uninitialized [-Werror=maybe-uninitialized] uses=cmake/build
2024/12/08 15:35:57 INFO cc1plus: all warnings being treated as errors uses=cmake/build
2024/12/08 15:36:11 WARN ninja: subcommand failed uses=cmake/build

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[JohanMabille]

But perhaps this should be added upstream so that each impacted downstream needn't work around this independently.

Yes, definitely. Thanks for reporting.

[jjerphan]

@dannf: can you let us know if #3669 fixes the problem?

[dannf]

@dannf: can you let us know if #3669 fixes the problem?

It did, thank you @jjerphan and @JohanMabille !