[glibc] aarch64: SVE ACLE configure test cleanups

[Szabolcs Nagy <nsz@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ee68e9cba456ed02f080cccd0c37af671bd48108

commit ee68e9cba456ed02f080cccd0c37af671bd48108
Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date:   Thu May 4 10:14:43 2023 +0100

    aarch64: SVE ACLE configure test cleanups
    
    Use more idiomatic configure test for better autoconf cache and logs.

Diff:
---
 sysdeps/aarch64/configure    | 24 ++++++++++++++++--------
 sysdeps/aarch64/configure.ac | 19 +++++++++++--------
 2 files changed, 27 insertions(+), 16 deletions(-)

diff --git a/sysdeps/aarch64/configure b/sysdeps/aarch64/configure
index d0d78d69f1..030996c55a 100644
--- a/sysdeps/aarch64/configure
+++ b/sysdeps/aarch64/configure
@@ -335,18 +335,26 @@ fi
 # Check if compiler is sufficient to build mathvec (needs SVE ACLE)
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for availability of SVE ACLE" >&5
 $as_echo_n "checking for availability of SVE ACLE... " >&6; }
-if ${libc_cv_has_sve_acle+:} false; then :
+if ${libc_cv_aarch64_sve_acle+:} false; then :
   $as_echo_n "(cached) " >&6
 else
-    if test $build_mathvec = yes; then
     cat > conftest.c <<EOF
 #include <arm_sve.h>
 EOF
-    if ! ${CC-cc} conftest.c -fsyntax-only -ffreestanding; then
-      as_fn_error 1 "mathvec is enabled but compiler does not have SVE ACLE. Either use a compatible compiler or configure with --disable-mathvec (this results in incomplete ABI)."
-    fi
-    rm conftest.c
+  if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -fsyntax-only -ffreestanding conftest.c'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }; then
+    libc_cv_aarch64_sve_acle=yes
+  else
+    libc_cv_aarch64_sve_acle=no
   fi
+  rm conftest.c
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_aarch64_sve_acle" >&5
+$as_echo "$libc_cv_aarch64_sve_acle" >&6; }
+if test $build_mathvec = yes && test $libc_cv_aarch64_sve_acle = no; then
+  as_fn_error $? "mathvec is enabled but compiler does not have SVE ACLE. Either use a compatible compiler or configure with --disable-mathvec (this results in incomplete ABI)." "$LINENO" 5
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_has_sve_acle" >&5
-$as_echo "$libc_cv_has_sve_acle" >&6; }
diff --git a/sysdeps/aarch64/configure.ac b/sysdeps/aarch64/configure.ac
index 259edc3de8..76f78fcba9 100644
--- a/sysdeps/aarch64/configure.ac
+++ b/sysdeps/aarch64/configure.ac
@@ -107,13 +107,16 @@ if test x"$build_mathvec" = xnotset; then
 fi
 
 # Check if compiler is sufficient to build mathvec (needs SVE ACLE)
-AC_CACHE_CHECK(for availability of SVE ACLE, libc_cv_has_sve_acle, [dnl
-  if test $build_mathvec = yes; then
-    cat > conftest.c <<EOF
+AC_CACHE_CHECK(for availability of SVE ACLE, libc_cv_aarch64_sve_acle, [dnl
+  cat > conftest.c <<EOF
 #include <arm_sve.h>
 EOF
-    if ! ${CC-cc} conftest.c -fsyntax-only -ffreestanding; then
-      as_fn_error 1 "mathvec is enabled but compiler does not have SVE ACLE. Either use a compatible compiler or configure with --disable-mathvec (this results in incomplete ABI)."
-    fi
-    rm conftest.c
-  fi])
+  if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -fsyntax-only -ffreestanding conftest.c]); then
+    libc_cv_aarch64_sve_acle=yes
+  else
+    libc_cv_aarch64_sve_acle=no
+  fi
+  rm conftest.c])
+if test $build_mathvec = yes && test $libc_cv_aarch64_sve_acle = no; then
+  AC_MSG_ERROR([mathvec is enabled but compiler does not have SVE ACLE. Either use a compatible compiler or configure with --disable-mathvec (this results in incomplete ABI).])
+fi