[glibc/release/2.35/master] aarch64: fix check for SVE support in assembler

[Wilco Dijkstra <wilco@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=7f3c1433815c4c00755a1b7c2f015d18196c6c0e

commit 7f3c1433815c4c00755a1b7c2f015d18196c6c0e
Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date:   Wed Mar 13 14:34:14 2024 +0000

    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:
---
 sysdeps/aarch64/configure    | 5 +++--
 sysdeps/aarch64/configure.ac | 5 +++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/sysdeps/aarch64/configure b/sysdeps/aarch64/configure
old mode 100644
new mode 100755
index 276a2d1dc4..af47ca78f3
--- a/sysdeps/aarch64/configure
+++ b/sysdeps/aarch64/configure
@@ -312,9 +312,10 @@ 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 6afe178823..186e1007ea 100644
--- a/sysdeps/aarch64/configure.ac
+++ b/sysdeps/aarch64/configure.ac
@@ -94,9 +94,10 @@ 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