[COMMITTED] aarch64: More configure checks for libmvec

[COMMITTED] aarch64: More configure checks for libmvec

[Szabolcs Nagy]

Check assembler and linker support too, not just SVE ACLE in the
compiler, since variant PCS requires at least binutils 2.32.1.
---
 sysdeps/aarch64/configure    | 29 ++++++++++++++++++++++++++---
 sysdeps/aarch64/configure.ac | 25 ++++++++++++++++++++++---
 2 files changed, 48 insertions(+), 6 deletions(-)

diff --git a/sysdeps/aarch64/configure b/sysdeps/aarch64/configure
index 030996c55a..5497dd397e 100644
--- a/sysdeps/aarch64/configure
+++ b/sysdeps/aarch64/configure
@@ -332,7 +332,7 @@ if test x"$build_mathvec" = xnotset; then
   build_mathvec=yes
 fi
 
-# Check if compiler is sufficient to build mathvec (needs SVE ACLE)
+# Check if compiler supports 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_aarch64_sve_acle+:} false; then :
@@ -355,6 +355,29 @@ EOF
 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
+
+# Check if compiler is sufficient to build mathvec
+if test $build_mathvec = yes; then
+  fail=no
+  if test $libc_cv_aarch64_variant_pcs = no; then
+    fail=yes
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: mathvec is enabled but linker does not support variant PCS." >&5
+$as_echo "$as_me: WARNING: mathvec is enabled but linker does not support variant PCS." >&2;}
+  fi
+  if test $libc_cv_aarch64_sve_asm = no; then
+    fail=yes
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: mathvec is enabled but assembler does not support SVE." >&5
+$as_echo "$as_me: WARNING: mathvec is enabled but assembler does not support SVE." >&2;}
+  fi
+  if test $libc_cv_aarch64_sve_acle = no; then
+    fail=yes
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: mathvec is enabled but compiler does not have SVE ACLE." >&5
+$as_echo "$as_me: WARNING: mathvec is enabled but compiler does not have SVE ACLE." >&2;}
+  fi
+  if test $fail = yes; then
+    as_fn_error $? "use a compatible toolchain or configure with --disable-mathvec (this results in incomplete ABI)." "$LINENO" 5
+  fi
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: mathvec is disabled, this results in incomplete ABI." >&5
+$as_echo "$as_me: WARNING: mathvec is disabled, this results in incomplete ABI." >&2;}
 fi
diff --git a/sysdeps/aarch64/configure.ac b/sysdeps/aarch64/configure.ac
index 76f78fcba9..27874eceb4 100644
--- a/sysdeps/aarch64/configure.ac
+++ b/sysdeps/aarch64/configure.ac
@@ -106,7 +106,7 @@ if test x"$build_mathvec" = xnotset; then
   build_mathvec=yes
 fi
 
-# Check if compiler is sufficient to build mathvec (needs SVE ACLE)
+# Check if compiler supports SVE ACLE.
 AC_CACHE_CHECK(for availability of SVE ACLE, libc_cv_aarch64_sve_acle, [dnl
   cat > conftest.c <<EOF
 #include <arm_sve.h>
@@ -117,6 +117,25 @@ EOF
     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).])
+
+# Check if compiler is sufficient to build mathvec
+if test $build_mathvec = yes; then
+  fail=no
+  if test $libc_cv_aarch64_variant_pcs = no; then
+    fail=yes
+    AC_MSG_WARN([mathvec is enabled but linker does not support variant PCS.])
+  fi
+  if test $libc_cv_aarch64_sve_asm = no; then
+    fail=yes
+    AC_MSG_WARN([mathvec is enabled but assembler does not support SVE.])
+  fi
+  if test $libc_cv_aarch64_sve_acle = no; then
+    fail=yes
+    AC_MSG_WARN([mathvec is enabled but compiler does not have SVE ACLE.])
+  fi
+  if test $fail = yes; then
+    AC_MSG_ERROR([use a compatible toolchain or configure with --disable-mathvec (this results in incomplete ABI).])
+  fi
+else
+  AC_MSG_WARN([mathvec is disabled, this results in incomplete ABI.])
 fi
-- 
2.25.1