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libgcc: aarch64: Configure check for .variant_pcs support

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Ideally SME support routines in libgcc are marked as variant PCS symbols
so check if as supports the directive.

libgcc/ChangeLog:

	* config.in: Undef HAVE_AS_VARIANT_PCS.
	* configure: Regenerate.
	* configure.ac: Check for .variant_pcs.
This commit is contained in:
Szabolcs Nagy 2022-11-14 17:14:18 +00:00
parent 5e25baa7e5
commit 3ebb591c65
3 changed files with 59 additions and 0 deletions
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3
libgcc/config.in
View File

@ -13,6 +13,9 @@
/* Define to 1 if the assembler supports LSE. */
#undef HAVE_AS_LSE
/* Define to 1 if the assembler supports .variant_pcs. */
#undef HAVE_AS_VARIANT_PCS
/* Define to 1 if the target assembler supports thread-local storage. */
#undef HAVE_CC_TLS

39
libgcc/configure vendored
View File

@ -5619,6 +5619,45 @@ $as_echo "#define HAVE_AS_LSE 1" >>confdefs.h
;;
esac
case "${target}" in
aarch64*-*-*)
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if as supports .variant_pcs" >&5
$as_echo_n "checking if as supports .variant_pcs... " >&6; }
if ${libgcc_cv_as_variant_pcs+:} false; then :
$as_echo_n "(cached) " >&6
else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
int
main ()
{
asm (".variant_pcs foobar");
;
return 0;
}
_ACEOF
if ac_fn_c_try_compile "$LINENO"; then :
libgcc_cv_as_variant_pcs=yes
else
libgcc_cv_as_variant_pcs=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgcc_cv_as_variant_pcs" >&5
$as_echo "$libgcc_cv_as_variant_pcs" >&6; }
if test x$libgcc_cv_as_variant_pcs = xyes; then
$as_echo "#define HAVE_AS_VARIANT_PCS 1" >>confdefs.h
fi
;;
esac
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for init priority support" >&5
$as_echo_n "checking for init priority support... " >&6; }
if ${libgcc_cv_init_priority+:} false; then :

17
libgcc/configure.ac
View File

@ -648,6 +648,23 @@ changequote([,])dnl
esac])
LIBGCC_CHECK_AS_LSE
dnl Check if as supports .variant_pcs.
AC_DEFUN([LIBGCC_CHECK_AS_VARIANT_PCS], [
case "${target}" in
aarch64*-*-*)
AC_CACHE_CHECK([if as supports .variant_pcs], libgcc_cv_as_variant_pcs, [
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,
[[asm (".variant_pcs foobar");]])],
[libgcc_cv_as_variant_pcs=yes], [libgcc_cv_as_variant_pcs=no])
])
if test x$libgcc_cv_as_variant_pcs = xyes; then
AC_DEFINE(HAVE_AS_VARIANT_PCS, 1,
[Define to 1 if the assembler supports .variant_pcs.])
fi
;;
esac])
LIBGCC_CHECK_AS_VARIANT_PCS
dnl Check if as supports RTM instructions.
AC_CACHE_CHECK(for init priority support, libgcc_cv_init_priority, [
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,