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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 <thuth@redhat.com>
Message-Id: <20210525142032.156989-1-thuth@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Thomas Huth 2021-05-25 16:20:32 +02:00 committed by Cornelia Huck
parent 463e50da8b
commit 3af448b386
1 changed files with 1 additions and 1 deletions
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2
configure vendored
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@ -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."