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configure: Check support of compile flags with -Werror

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gcc fails if an unsupported compile flag is given, but clang and clang++
normally only emit a warning "argument unused during compilation".

The old test had accepted flags like -mavx for clang++ on non Intel hosts.
This resulted in build failures because Intel code was included.

Now the check runs with -Werror, and unsupported flags are detected as
an error. This fixes the build problem with clang++ on non Intel hosts.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
This commit is contained in:
Stefan Weil 2019-03-26 16:41:52 +01:00
parent b6bfb20f1d
commit 4ccbb9f830
1 changed files with 6 additions and 6 deletions
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12
configure.ac
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@ -117,22 +117,22 @@ AM_CONDITIONAL([AVX2_OPT], false)
AM_CONDITIONAL([SSE41_OPT], false)
AM_CONDITIONAL([MARCH_NATIVE_OPT], false)
AX_CHECK_COMPILE_FLAG([-mavx], [avx=true], [avx=false])
AX_CHECK_COMPILE_FLAG([-mavx], [avx=true], [avx=false], [-Werror])
if $avx; then
AM_CONDITIONAL([AVX_OPT], true)
fi
AX_CHECK_COMPILE_FLAG([-mavx2], [avx2=true], [avx2=false])
AX_CHECK_COMPILE_FLAG([-mavx2], [avx2=true], [avx2=false], [-Werror])
if $avx2; then
AM_CONDITIONAL([AVX2_OPT], true)
fi
AX_CHECK_COMPILE_FLAG([-msse4.1], [sse41=true], [sse41=false])
AX_CHECK_COMPILE_FLAG([-msse4.1], [sse41=true], [sse41=false], [-Werror])
if $sse41; then
AM_CONDITIONAL([SSE41_OPT], true)
fi
AX_CHECK_COMPILE_FLAG([-march=native], [arch_native=true], [arch_native=false])
AX_CHECK_COMPILE_FLAG([-march=native], [arch_native=true], [arch_native=false], [-Werror])
if $arch_native; then
AM_CONDITIONAL([MARCH_NATIVE_OPT], true)
fi
@ -337,12 +337,12 @@ dnl **********************
CPLUSPLUS=
AX_CHECK_COMPILE_FLAG([-std=c++11], [cplusplus11=true], [cplusplus11=false])
AX_CHECK_COMPILE_FLAG([-std=c++11], [cplusplus11=true], [cplusplus11=false], [-Werror])
if $cplusplus11; then
CPLUSPLUS=11
fi
AX_CHECK_COMPILE_FLAG([-std=c++14], [cplusplus14=true], [cplusplus14=false])
AX_CHECK_COMPILE_FLAG([-std=c++14], [cplusplus14=true], [cplusplus14=false], [-Werror])
if $cplusplus14; then
CPLUSPLUS=14
fi