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Change SIMD test to use a compile check.

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This commit is contained in:
Wayne Davison
2020-06-20 10:34:12 -07:00
parent 63508f1518
commit f9aece899f
1 changed files with 12 additions and 27 deletions
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39
configure.ac
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@@ -69,7 +69,7 @@ if test x"$ac_cv_path_PYTHON3" = x; then
AC_MSG_RESULT(no - python3 not found)
md2man_works=no
else
md2man_out=`"$srcdir/md2man" --test "$srcdir/rsync.1.md" 2>&1`
md2man_out=`"$srcdir/md2man" --test "$srcdir/rsync-ssl.1.md" 2>&1`
if test $? = 0; then
AC_MSG_RESULT(yes)
md2man_works=yes
@@ -203,36 +203,21 @@ AC_ARG_ENABLE(simd,
if test x"$enable_simd" != x"no"; then
# For x86-64 SIMD, g++ >=5 or clang++ >=7 is required
if test x"$build_cpu" = x"x86_64"; then
CXX_OK=
case "$CXX" in
g++|*-g++)
CXX_VERSION=`$CXX -dumpversion | sed 's/\..*//'`
if test "$CXX_VERSION" -ge "5"; then
CXX_OK=yes
fi
;;
*clang*)
# -dumpversion is broken on older clang versions, so we need a fallback.
CXX_VERSION=`$CXX -dumpversion 2>/dev/null | sed 's/\..*//'`
if test x"$CXX_VERSION" = x; then
CXX_VERSION=`$CXX --version | head -n 1 | sed 's/.*version //' | sed 's/\..*//'`
fi
if test "$CXX_VERSION" -ge "7"; then
CXX_OK=yes
fi
;;
*)
CXX='No c++'
CXX_VERSION='Unknown'
;;
esac
AC_LANG(C++)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>
#include <immintrin.h>
__attribute__ ((target("default"))) static int testing(int x) { return x; }
__attribute__ ((target("sse3"))) static int testing(int x) { return x; }
__attribute__ ((target("sse2"))) static int testing(int x) { return x; }
]], [[if (testing(42)) printf("HERE\n");]])],[CXX_OK=yes],[CXX_OK=no])
AC_LANG(C)
if test x"$CXX_OK" = x"yes"; then
# AC_MSG_RESULT() is called below.
SIMD="$SIMD x86_64"
else
elif test x"$enable_simd" = x"yes"; then
AC_MSG_RESULT(error)
AC_MSG_ERROR([Failed to find g++ >=5 or clang++ >=7 for SIMD optimizations.
Specify --disable-simd to continue without it. ($CXX, $CXX_VERSION)])
AC_MSG_ERROR(The SIMD compilation test failed.
Omit --enable-simd to continue without it.)
fi
elif test x"$enable_simd" = x"yes"; then
AC_MSG_RESULT(unavailable)