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Disable AVX512 when using ancient versions of GCC

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This commit is contained in:
Frank Denis 2018-10-31 10:38:09 +01:00
parent 1dae690ad7
commit 43d51e4e6d
1 changed files with 5 additions and 3 deletions
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8
configure.ac
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@ -324,10 +324,12 @@ AX_CHECK_LINK_FLAG([-Wl,-z,relro], [LDFLAGS="$LDFLAGS -Wl,-z,relro"])
AX_CHECK_LINK_FLAG([-Wl,-z,now], [LDFLAGS="$LDFLAGS -Wl,-z,now"])
AX_CHECK_LINK_FLAG([-Wl,-z,noexecstack], [LDFLAGS="$LDFLAGS -Wl,-z,noexecstack"])
AC_MSG_CHECKING(for a broken clang + AVX512 combination)
AC_MSG_CHECKING(for obsolete compiler with possibly broken AVX512 support)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[
#if !(defined(__AVX512F__) && defined(__clang__) && __clang_major__ < 4)
#error Not a broken clang + AVX512 combination
#if !(defined(__AVX512F__) && \
((defined(__clang__) && __clang_major__ < 4) || \
(defined(__GNUC__) && __GNUC__ < 6)))
#error Compiler should properly support AVX512 opcodes
#endif
]])],
[AC_MSG_RESULT(yes - disabling AVX512 optimizations)