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[host] cmake: use -march=x86-64-v2 when it becomes available

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GCC 11 will support x86_64 micro-architecture feature levels.
What we really want to support is nehalem or newer, which is x86-64-v2,
and specifying this instead of nehalem means that we are not tuning for
nehalem specifically.
This commit is contained in:
Quantum 2021-07-19 20:55:20 -04:00 committed by Geoffrey McRae
parent f5ad14b109
commit 0525515bee
1 changed files with 8 additions and 3 deletions
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11
host/CMakeLists.txt
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@ -17,9 +17,14 @@ if(OPTIMIZE_FOR_NATIVE)
add_compile_options("-march=native")
endif()
else()
CHECK_C_COMPILER_FLAG("-march=nehalem" COMPILER_SUPPORTS_MARCH_NEHALEM)
if(COMPILER_SUPPORTS_MARCH_NEHALEM)
add_compile_options("-march=nehalem")
CHECK_C_COMPILER_FLAG("-march=x86-64-v2" COMPILER_SUPPORTS_MARCH_X86_64_V2)
if(COMPILER_SUPPORTS_MARCH_X86_64_V2)
add_compile_options("-march=x86-64-v2")
else()
CHECK_C_COMPILER_FLAG("-march=nehalem" COMPILER_SUPPORTS_MARCH_NEHALEM)
if(COMPILER_SUPPORTS_MARCH_NEHALEM)
add_compile_options("-march=nehalem")
endif()
endif()
endif()