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CMake: Add ALLOW_CLMUL_CRC option to enable/disable CLMUL. 

The option is enabled by default, but will only be visible to a user
listing cache variables or using a CMake GUI application if the
immintrin.h header file is found.

This mirrors our Autotools build --disable-clmul-crc functionality.
This commit is contained in:
Jia Tan 2023-10-19 16:09:01 +08:00
parent 5056bc5107
commit 1695021e4a
1 changed files with 23 additions and 17 deletions
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8
CMakeLists.txt
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@ -802,12 +802,17 @@ if(HAVE_IMMINTRIN_H)
tuklib_add_definition_if(liblzma HAVE__MM_MOVEMASK_EPI8)
# CLMUL intrinsic:
option(ALLOW_CLMUL_CRC "Allow carryless multiplication for CRC \
calculation if supported by the system" ON)
if(ALLOW_CLMUL_CRC)
check_c_source_compiles("
#include <immintrin.h>
#if defined(__e2k__) && __iset__ < 6
# error
#endif
#if (defined(__GNUC__) || defined(__clang__)) && !defined(__EDG__)
#if (defined(__GNUC__) || defined(__clang__)) \
&& !defined(__EDG__)
__attribute__((__target__(\"ssse3,sse4.1,pclmul\")))
#endif
__m128i my_clmul(__m128i a)
@ -820,6 +825,7 @@ if(HAVE_IMMINTRIN_H)
HAVE_USABLE_CLMUL)
tuklib_add_definition_if(liblzma HAVE_USABLE_CLMUL)
endif()
endif()
# Support -fvisiblity=hidden when building shared liblzma.
# These lines do nothing on Windows (even under Cygwin).