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cpu.cmake: fix compiler flag detection w/3.17.0+

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Between 3.17.0 and 3.18.2 check_cxx_compiler_flag() sets a normal
variable at parent scope while check_cxx_source_compiles() continues to
set an internal cache variable, so we unset both to avoid the failure /
success state persisting between checks.

This was fixed in 3.18.3 [1], but regressed shortly afterward [2];
currently seen with 3.20.0 installed via homebrew.

[1] https://gitlab.kitware.com/cmake/cmake/-/issues/21207
[2]
90dead024c CheckCompilerFlag: unified way to check compiler flags per language

Change-Id: I57282f89b07a9cfd85aca7569380f7d115c0b3cf
This commit is contained in:
James Zern 2021-07-05 17:52:51 -07:00
parent a2e18f10eb
commit 327ef24fbd
1 changed files with 7 additions and 0 deletions
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7
cmake/cpu.cmake
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@ -125,6 +125,12 @@ foreach(I_SIMD RANGE ${WEBP_SIMD_FLAGS_RANGE})
list(GET SIMD_DISABLE_FLAGS ${I_SIMD} SIMD_COMPILE_FLAG)
include(CheckCCompilerFlag)
if(SIMD_COMPILE_FLAG)
# Between 3.17.0 and 3.18.2 check_cxx_compiler_flag() sets a normal
# variable at parent scope while check_cxx_source_compiles() continues
# to set an internal cache variable, so we unset both to avoid the
# failure / success state persisting between checks. See
# https://gitlab.kitware.com/cmake/cmake/-/issues/21207.
unset(HAS_COMPILE_FLAG)
unset(HAS_COMPILE_FLAG CACHE)
check_c_compiler_flag(${SIMD_COMPILE_FLAG} HAS_COMPILE_FLAG)
if(HAS_COMPILE_FLAG)
@ -142,6 +148,7 @@ foreach(I_SIMD RANGE ${WEBP_SIMD_FLAGS_RANGE})
"warning: argument unused during compilation:"
${COMMON_PATTERNS})
if(NOT FLAG_${SIMD_COMPILE_FLAG})
unset(HAS_COMPILE_FLAG)
unset(HAS_COMPILE_FLAG CACHE)
endif()
endif()