aarch64: fix check for SVE support in assembler

Due to GCC bug 110901 -mcpu can override -march setting when compiling
asm code and thus a compiler targetting a specific cpu can fail the
configure check even when binutils gas supports SVE.

The workaround is that explicit .arch directive overrides both -mcpu
and -march, and since that's what the actual SVE memcpy uses the
configure check should use that too even if the GCC issue is fixed
independently.

Reviewed-by: Florian Weimer <fweimer@redhat.com>
(cherry picked from commit 73c26018ed0ecd9c807bb363cc2c2ab4aca66a82)

diff --git a/sysdeps/aarch64/configure b/sysdeps/aarch64/configure
old mode 100644 (file)
new mode 100755 (executable)
index 2130f6b..19d2b46
--- a/sysdeps/aarch64/configure
+++ b/sysdeps/aarch64/configure
@@ -307,9 +307,10 @@ if ${libc_cv_aarch64_sve_asm+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   cat > conftest.s <<\EOF
-        ptrue p0.b
+       .arch armv8.2-a+sve
+       ptrue p0.b
 EOF
-if { ac_try='${CC-cc} -c -march=armv8.2-a+sve conftest.s 1>&5'
+if { ac_try='${CC-cc} -c conftest.s 1>&5'
   { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
   (eval $ac_try) 2>&5
   ac_status=$?

diff --git a/sysdeps/aarch64/configure.ac b/sysdeps/aarch64/configure.ac
index 85c6f765082811f5e8312eebda8d615eabcf39a1..bb5adb17828c0d8f203478c7872fd4fbc84f265a 100644 (file)
--- a/sysdeps/aarch64/configure.ac
+++ b/sysdeps/aarch64/configure.ac
@@ -90,9 +90,10 @@ LIBC_CONFIG_VAR([aarch64-variant-pcs], [$libc_cv_aarch64_variant_pcs])
 # Check if asm support armv8.2-a+sve
 AC_CACHE_CHECK([for SVE support in assembler], [libc_cv_aarch64_sve_asm], [dnl
 cat > conftest.s <<\EOF
-        ptrue p0.b
+       .arch armv8.2-a+sve
+       ptrue p0.b
 EOF
-if AC_TRY_COMMAND(${CC-cc} -c -march=armv8.2-a+sve conftest.s 1>&AS_MESSAGE_LOG_FD); then
+if AC_TRY_COMMAND(${CC-cc} -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
   libc_cv_aarch64_sve_asm=yes
 else
   libc_cv_aarch64_sve_asm=no