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[CMake] Disable more noisy GCC warnings #159044

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merged 1 commit into from
Sep 16, 2025
+16 −0
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[CMake] Disable more noisy GCC warnings #159044

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16 changes: 16 additions & 0 deletions llvm/cmake/modules/HandleLLVMOptions.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -911,6 +911,22 @@ if (LLVM_ENABLE_WARNINGS AND (LLVM_COMPILER_IS_GCC_COMPATIBLE OR CLANG_CL))
endif()
endif()

# Disable -Warray-bounds on GCC; this warning exists since a very long time,
# but since GCC 11, it produces a lot of very noisy, seemingly false positive
# warnings (potentially originating in libstdc++).
if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
append("-Wno-array-bounds" CMAKE_CXX_FLAGS)
endif()

# Disable -Wstringop-overread on GCC; this warning produces a number of very
# noisy diagnostics when -Warray-bounds is disabled above; this option exists
# since GCC 11.
if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
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We should probably deduplicate this CMAKE_CXX_COMPILER_ID STREQUAL "GNU" check, as it's repeated 6 times in a row now...

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Sure, I can do that as a separate change.

if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 11.1)
append("-Wno-stringop-overread" CMAKE_CXX_FLAGS)
endif()
endif()

# The LLVM libraries have no stable C++ API, so -Wnoexcept-type is not useful.
append("-Wno-noexcept-type" CMAKE_CXX_FLAGS)

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