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CMake: Compile with -ftrivial-auto-var-init=zero #139

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Mar 20, 2024
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CMake: Compile with -ftrivial-auto-var-init=zero #139

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16 changes: 16 additions & 0 deletions vendor/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,22 @@ if(APPLE)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D_DARWIN_C_SOURCE -D__DARWIN_C_LEVEL=__DARWIN_C_FULL")
endif()

# Different versions of clang require a different set of flags for -ftrivial-auto-var-init
# Simplify this contruct once old clang version support is dropped
include(CheckCXXCompilerFlag)
check_cxx_compiler_flag("-ftrivial-auto-var-init=zero" COMPILER_SUPPORTS_TRIVIAL_ZERO_INIT)
if(COMPILER_SUPPORTS_TRIVIAL_ZERO_INIT)
set(VAR_ZERO_INIT_FLAGS "-ftrivial-auto-var-init=zero")
else()
check_cxx_compiler_flag("-ftrivial-auto-var-init=zero -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang"
COMPILER_REQUIRES_ENABLE_TRIVIAL_ZERO_INIT)
if(COMPILER_REQUIRES_ENABLE_TRIVIAL_ZERO_INIT)
set(VAR_ZERO_INIT_FLAGS "-ftrivial-auto-var-init=zero -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang")
endif()
endif()
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${VAR_ZERO_INIT_FLAGS}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${VAR_ZERO_INIT_FLAGS}")

# Android seems to use various attributes supported by clang but not by
# GCC which causes it to emit lots of warnings. Since these attributes
# don't seem to effect runtime behaviour simply disable the warnings.
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