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Ignore libstdc++'s <format> sign change in the sanitizer job

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libstdc++ 14's <format> initializes a size_t parameter with -1 (GCC bug
119429), so every std::format call fails ci_test_clang_sanitizer under
-fsanitize=integer (test-std-format_cpp20). Exclude only the
implicit-integer-sign-change check and only that header via
-fsanitize-ignorelist.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-10-05 12:36:10 +02:00
parent d5a1c5d149
commit f88e209ea9
2 changed files with 9 additions and 1 deletions
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cmake/ci.cmake
+1 -1
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@@ -376,7 +376,7 @@ add_custom_target(ci_test_coverage
# Sanitizers.
###############################################################################
set(CLANG_CXX_FLAGS_SANITIZER "-g -O1 -fsanitize=address -fsanitize=undefined -fsanitize=integer -fsanitize=nullability -fno-omit-frame-pointer -fno-sanitize-recover=all -fno-sanitize=unsigned-integer-overflow -fno-sanitize=unsigned-shift-base")
set(CLANG_CXX_FLAGS_SANITIZER "-g -O1 -fsanitize=address -fsanitize=undefined -fsanitize=integer -fsanitize=nullability -fno-omit-frame-pointer -fno-sanitize-recover=all -fno-sanitize=unsigned-integer-overflow -fno-sanitize=unsigned-shift-base -fsanitize-ignorelist=${PROJECT_SOURCE_DIR}/cmake/clang_sanitizer_ignorelist.txt")
add_custom_target(ci_test_clang_sanitizer
COMMAND CXX=${CLANG_TOOL} CXXFLAGS=${CLANG_CXX_FLAGS_SANITIZER} ${CMAKE_COMMAND}
cmake/clang_sanitizer_ignorelist.txt
+8
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@@ -0,0 +1,8 @@
# Sanitizer ignore list for ci_test_clang_sanitizer (-fsanitize-ignorelist).
#
# libstdc++ 14's <format> declares `_Scanner(basic_string_view<_CharT>, size_t __nargs = -1)`, so every std::format
# call converts -1 to size_t, which -fsanitize=integer reports as implicit-integer-sign-change. This is
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119429, not a bug in this library. Only that check and only <format> are
# excluded, so implicit sign changes in the library and the tests are still reported.
[implicit-integer-sign-change]
src:*/include/c++/*/format