Use -frounding-math iff compiler supports it

1 files changed, 24 insertions, 0 deletions

diff --git a/configure b/configure
index d31af0b137..361bec7d20 100755
--- a/configure
+++ b/configure
@@ -7344,6 +7344,30 @@ printf "%s\n" "$libc_cv_cc_signaling_nans" >&6; }
 config_vars="$config_vars
 config-cflags-signaling-nans = $libc_cv_cc_signaling_nans"
 
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for compiler option -frounding-math" >&5
+printf %s "checking for compiler option -frounding-math... " >&6; }
+if test ${libc_cv_cc_rounding_math+y}
+then :
+  printf %s "(cached) " >&6
+else $as_nop
+  if { ac_try='${CC-cc} -Werror -frounding-math -xc /dev/null -S -o /dev/null'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }
+then :
+  libc_cv_cc_rounding_math=-frounding-math
+else $as_nop
+  libc_cv_cc_rounding_math=
+fi
+
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_cc_rounding_math" >&5
+printf "%s\n" "$libc_cv_cc_rounding_math" >&6; }
+config_vars="$config_vars
+config-cflags-frounding-math = $libc_cv_cc_rounding_math"
+
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if $CC accepts -fno-tree-loop-distribute-patterns with \
 __attribute__ ((__optimize__))" >&5
 printf %s "checking if $CC accepts -fno-tree-loop-distribute-patterns with \