Package: cmake
Version: 2.8.9-1
The following cmake code works nicely with gcc-4.7:
include(CheckCCompilerFlag)
check_c_compiler_flag(-msse2 HAS_MSSE2)
check_c_compiler_flag(-mavx HAS_MAVX)
check_c_compiler_flag(-mavx2 HAS_MAVX2)
check_c_compiler_flag(-mssse3 HAS_MSSSE3)
check_c_compiler_flag(-faltivec HAS_FALTIVEC)
check_c_compiler_flag(-maltivec HAS_MALTIVEC)
on my amd64 box, it returns:
-- Performing Test HAS_MSSE2
-- Performing Test HAS_MSSE2 - Success
-- Performing Test HAS_MAVX
-- Performing Test HAS_MAVX - Success
-- Performing Test HAS_MAVX2
-- Performing Test HAS_MAVX2 - Success
-- Performing Test HAS_MSSSE3
-- Performing Test HAS_MSSSE3 - Success
-- Performing Test HAS_FALTIVEC
-- Performing Test HAS_FALTIVEC - Failed
-- Performing Test HAS_MALTIVEC
-- Performing Test HAS_MALTIVEC - Failed
However running with clang (same box) returns the following:
$ export CC=clang
$ export CXX=clang++
$ cmake .
[...]
-- Performing Test HAS_MSSE2
-- Performing Test HAS_MSSE2 - Success
-- Performing Test HAS_MAVX
-- Performing Test HAS_MAVX - Success
-- Performing Test HAS_MAVX2
-- Performing Test HAS_MAVX2 - Success
-- Performing Test HAS_MSSSE3
-- Performing Test HAS_MSSSE3 - Success
-- Performing Test HAS_FALTIVEC
-- Performing Test HAS_FALTIVEC - Success
-- Performing Test HAS_MALTIVEC
-- Performing Test HAS_MALTIVEC - Success
Looks like clang does not handle bogus command line option the same
way gcc does:
$ cat t.c
int main() {}
$ clang -faltivec t.c
$ echo $?
0
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