Doctest spams several thousands warnings with memory sanitizer

[qarmin]

Description

When compliing doctest with memory sanitizer,

CXX=clang++ CXXFLAGS="-fsanitize=memory -fsanitize-recover=memory -fsanitize-memory-track-origins -Og" LDFLAGS="-fsanitize=memory" cmake .;make -j6

it produce thousands of warnings when executing examples/all_features/all_features

==110585==WARNING: MemorySanitizer: use-of-uninitialized-value
    #0 0x55573e7a1bb9 in doctest::(anonymous namespace)::wildcmp(char const*, char const*, bool) main.cpp
    #1 0x55573e75fc7b in doctest::(anonymous namespace)::matchesAny(char const*, std::vector<doctest::String, std::allocator<doctest::String> > const&, bool, bool) main.cpp
    #2 0x55573e79270a in doctest::Context::run() (/home/rafal/test/doctest/examples/all_features/all_features+0x12770a) (BuildId: 3ea1d43b0b3e71f1d4967436582f7754d57a2e19)
    #3 0x55573e79e5e8 in main (/home/rafal/test/doctest/examples/all_features/all_features+0x1335e8) (BuildId: 3ea1d43b0b3e71f1d4967436582f7754d57a2e19)
    #4 0x7ffb3d635d8f in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
    #5 0x7ffb3d635e3f in __libc_start_main csu/../csu/libc-start.c:392:3
    #6 0x55573e6c0704 in _start (/home/rafal/test/doctest/examples/all_features/all_features+0x55704) (BuildId: 3ea1d43b0b3e71f1d4967436582f7754d57a2e19)

  Uninitialized value was stored to memory at
    #0 0x55573e6ee709 in __msan_memcpy (/home/rafal/test/doctest/examples/all_features/all_features+0x83709) (BuildId: 3ea1d43b0b3e71f1d4967436582f7754d57a2e19)
    #1 0x55573e74ea67 in doctest::String::String(doctest::String&&) (/home/rafal/test/doctest/examples/all_features/all_features+0xe3a67) (BuildId: 3ea1d43b0b3e71f1d4967436582f7754d57a2e19)
    #2 0x55573e897194 in void __gnu_cxx::new_allocator<doctest::String>::construct<doctest::String, doctest::String>(doctest::String*, doctest::String&&) (/home/rafal/test/doctest/examples/all_features/all_features+0x22c194) (BuildId: 3ea1d43b0b3e71f1d4967436582f7754d57a2e19)
    #3 0x55573e89576b in void std::allocator_traits<std::allocator<doctest::String> >::construct<doctest::String, doctest::String>(std::allocator<doctest::String>&, doctest::String*, doctest::String&&) (/home/rafal/test/doctest/examples/all_features/all_features+0x22a76b) (BuildId: 3ea1d43b0b3e71f1d4967436582f7754d57a2e19)
    #4 0x55573e8963ad in void std::vector<doctest::String, std::allocator<doctest::String> >::_M_realloc_insert<doctest::String>(__gnu_cxx::__normal_iterator<doctest::String*, std::vector<doctest::String, std::allocator<doctest::String> > >, doctest::String&&) (/home/rafal/test/doctest/examples/all_features/all_features+0x22b3ad) (BuildId: 3ea1d43b0b3e71f1d4967436582f7754d57a2e19)
    #5 0x55573e895435 in void std::vector<doctest::String, std::allocator<doctest::String> >::emplace_back<doctest::String>(doctest::String&&) (/home/rafal/test/doctest/examples/all_features/all_features+0x22a435) (BuildId: 3ea1d43b0b3e71f1d4967436582f7754d57a2e19)
    #6 0x55573e817311 in std::vector<doctest::String, std::allocator<doctest::String> >::push_back(doctest::String&&) (/home/rafal/test/doctest/examples/all_features/all_features+0x1ac311) (BuildId: 3ea1d43b0b3e71f1d4967436582f7754d57a2e19)
    #7 0x55573e7a2a51 in doctest::(anonymous namespace)::parseCommaSepArgs(int, char const* const*, char const*, std::vector<doctest::String, std::allocator<doctest::String> >&)::$_2::operator()() const main.cpp
    #8 0x55573e786aad in doctest::(anonymous namespace)::parseCommaSepArgs(int, char const* const*, char const*, std::vector<doctest::String, std::allocator<doctest::String> >&) main.cpp
    #9 0x55573e7786e1 in doctest::Context::parseArgs(int, char const* const*, bool) (/home/rafal/test/doctest/examples/all_features/all_features+0x10d6e1) (BuildId: 3ea1d43b0b3e71f1d4967436582f7754d57a2e19)
    #10 0x55573e7896ca in doctest::Context::setOption(char const*, char const*) (/home/rafal/test/doctest/examples/all_features/all_features+0x11e6ca) (BuildId: 3ea1d43b0b3e71f1d4967436582f7754d57a2e19)
    #11 0x55573e788e0c in doctest::Context::addFilter(char const*, char const*) (/home/rafal/test/doctest/examples/all_features/all_features+0x11de0c) (BuildId: 3ea1d43b0b3e71f1d4967436582f7754d57a2e19)
    #12 0x55573e79e472 in main (/home/rafal/test/doctest/examples/all_features/all_features+0x133472) (BuildId: 3ea1d43b0b3e71f1d4967436582f7754d57a2e19)
    #13 0x7ffb3d635d8f in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16

  Uninitialized value was stored to memory at
    #0 0x55573e6ee709 in __msan_memcpy (/home/rafal/test/doctest/examples/all_features/all_features+0x83709) (BuildId: 3ea1d43b0b3e71f1d4967436582f7754d57a2e19)
    #1 0x55573e74c1e4 in doctest::String::String(char const*, unsigned int) (/home/rafal/test/doctest/examples/all_features/all_features+0xe11e4) (BuildId: 3ea1d43b0b3e71f1d4967436582f7754d57a2e19)
    #2 0x55573e74bdd1 in doctest::String::String(char const*) (/home/rafal/test/doctest/examples/all_features/all_features+0xe0dd1) (BuildId: 3ea1d43b0b3e71f1d4967436582f7754d57a2e19)
    #3 0x55573e7a2a11 in doctest::(anonymous namespace)::parseCommaSepArgs(int, char const* const*, char const*, std::vector<doctest::String, std::allocator<doctest::String> >&)::$_2::operator()() const main.cpp
    #4 0x55573e786aad in doctest::(anonymous namespace)::parseCommaSepArgs(int, char const* const*, char const*, std::vector<doctest::String, std::allocator<doctest::String> >&) main.cpp
    #5 0x55573e7786e1 in doctest::Context::parseArgs(int, char const* const*, bool) (/home/rafal/test/doctest/examples/all_features/all_features+0x10d6e1) (BuildId: 3ea1d43b0b3e71f1d4967436582f7754d57a2e19)
    #6 0x55573e7896ca in doctest::Context::setOption(char const*, char const*) (/home/rafal/test/doctest/examples/all_features/all_features+0x11e6ca) (BuildId: 3ea1d43b0b3e71f1d4967436582f7754d57a2e19)
    #7 0x55573e788e0c in doctest::Context::addFilter(char const*, char const*) (/home/rafal/test/doctest/examples/all_features/all_features+0x11de0c) (BuildId: 3ea1d43b0b3e71f1d4967436582f7754d57a2e19)
    #8 0x55573e79e472 in main (/home/rafal/test/doctest/examples/all_features/all_features+0x133472) (BuildId: 3ea1d43b0b3e71f1d4967436582f7754d57a2e19)
    #9 0x7ffb3d635d8f in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16

  Uninitialized value was stored to memory at
    #0 0x55573e6ee709 in __msan_memcpy (/home/rafal/test/doctest/examples/all_features/all_features+0x83709) (BuildId: 3ea1d43b0b3e71f1d4967436582f7754d57a2e19)
    #1 0x7ffb3da87ee4 in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_replace(unsigned long, unsigned long, char const*, unsigned long) (/lib/x86_64-linux-gnu/libstdc++.so.6+0x14cee4) (BuildId: f57e02bfadacc0c923c82457d5e18e1830b5faea)

  Uninitialized value was created by an allocation of 's' in the stack frame of function '_ZN7doctest12_GLOBAL__N_117parseCommaSepArgsEiPKPKcS2_RSt6vectorINS_6StringESaIS6_EE'
    #0 0x55573e785720 in doctest::(anonymous namespace)::parseCommaSepArgs(int, char const* const*, char const*, std::vector<doctest::String, std::allocator<doctest::String> >&) main.cpp

SUMMARY: MemorySanitizer: use-of-uninitialized-value main.cpp in doctest::(anonymous namespace)::wildcmp(char const*, char const*, bool)

Extra information

• doctest version: Git
• Operating System: Ubuntu 22.04
• Compiler+version: Clang 14

[onqtam]

haven't looked in-depth, but could be because your STL is not built with MSAN - could be a duplicate issue like the previous reports for MSAN: https://github.com/doctest/doctest/issues?q=memory+sanitizer