2015-06-27 10:28:21 +01:00
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--- a/configure.ac 2011-09-22 16:13:22 +0000
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+++ b/configure.ac 2011-11-26 23:55:24 +0000
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2013-03-17 10:01:49 +00:00
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@@ -381,6 +381,28 @@
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AC_SUBST(HAVE_DARWIN_IEEE_INTERFACE)
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AC_SUBST(HAVE_DARWIN86_IEEE_INTERFACE)
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+dnl check for compiler flags to disable use of FMA
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+save_cflags="$CFLAGS"
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+AC_CACHE_CHECK([for compiler flags to disable use of FMA], ac_cv_c_fma_flags,
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+[
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+if test X"$GCC" = Xyes; then
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+ fma_flags='-ffp-contract=off'
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+else
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+ fma_flags=
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+fi
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+if test X"$fma_flags" != X; then
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+ CFLAGS="$fma_flags $CFLAGS"
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+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[int foo;]])],[ac_cv_c_fma_flags="$fma_flags"],[ac_cv_c_fma_flags="none"])
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+else
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+ ac_cv_c_fma_flags="none"
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+fi])
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+
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+if test "$ac_cv_c_fma_flags" != "none" ; then
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+ CFLAGS="$ac_cv_c_fma_flags $save_cflags"
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+else
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+ CFLAGS="$save_cflags"
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+fi
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+
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dnl Check for IEEE control flags
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save_cflags="$CFLAGS"
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