From 3af448b38677e7be5ccda6a65e06150abd1005b6 Mon Sep 17 00:00:00 2001 From: Thomas Huth Date: Tue, 25 May 2021 16:20:32 +0200 Subject: [PATCH] configure: Check whether we can compile the s390-ccw bios with -msoft-float The -msoft-float switch is not available in older versions of Clang. Since we rely on the compiler to not generate floating point instructions unexpectedly, we block those old compilers now via a test in the configure script. Note that for some weird reasons, the Clang compiler only complains about the missing soft-float support if no other flags are passed via "-Wl,..." to the linker. So we have to use "compile_object" instead of "compile_prog" for this check. Signed-off-by: Thomas Huth Message-Id: <20210525142032.156989-1-thuth@redhat.com> Signed-off-by: Cornelia Huck --- configure | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/configure b/configure index 262ab71802..931f6ac01a 100755 --- a/configure +++ b/configure @@ -5424,7 +5424,7 @@ if test "$cpu" = "s390x" ; then write_c_skeleton compile_prog "-march=z900" "" has_z900=$? - if [ $has_z900 = 0 ] || compile_prog "-march=z10" ""; then + if [ $has_z900 = 0 ] || compile_object "-march=z10 -msoft-float -Werror"; then if [ $has_z900 != 0 ]; then echo "WARNING: Your compiler does not support the z900!" echo " The s390-ccw bios will only work with guest CPUs >= z10."