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Fix check for .cfi_negate_ra_state on aarch64

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Checking for LD_VERSION in unreliable as not all distros define it on
the compiler's preprocessor.

Explicitly check it via autoconf.

This fixes support for Ubuntu 18.04 on arm64.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Juhyung Park <qkrwngud825@gmail.com>
Closes #18262
This commit is contained in:
Juhyung Park
2026-03-07 04:04:37 +09:00
committed by GitHub
parent e73ada771d
commit c58b8b7dc2
4 changed files with 38 additions and 4 deletions
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config/toolchain-cfi.m4
+33
View File
@@ -0,0 +1,33 @@
dnl # SPDX-License-Identifier: CDDL-1.0
dnl #
dnl # Check whether assembler supports .cfi_negate_ra_state on AArch64.
dnl #
AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_TOOLCHAIN_CFI_PSEUDO_OP], [
case "$host_cpu" in
aarch64*)
AC_CACHE_CHECK([whether assembler supports .cfi_negate_ra_state],
[zfs_cv_as_cfi_pseudo_op], [
cat > conftest.S <<_ACEOF
.text
conftest:
.cfi_startproc
.cfi_negate_ra_state
ret
.cfi_endproc
_ACEOF
if AC_TRY_COMMAND([$CC -c $CFLAGS $CPPFLAGS conftest.S -o conftest.o]) >/dev/null 2>&1; then
zfs_cv_as_cfi_pseudo_op=yes
else
zfs_cv_as_cfi_pseudo_op=no
fi
rm -f conftest.S conftest.o
])
AS_IF([test "x$zfs_cv_as_cfi_pseudo_op" = xyes], [
AC_DEFINE([HAVE_AS_CFI_PSEUDO_OP], 1,
[Define if your assembler supports .cfi_negate_ra_state.])
])
;;
esac
])
config/zfs-build.m4
+1
View File
@@ -266,6 +266,7 @@ AC_DEFUN([ZFS_AC_CONFIG_ALWAYS], [
ZFS_AC_CONFIG_ALWAYS_CC_ASAN
ZFS_AC_CONFIG_ALWAYS_CC_UBSAN
ZFS_AC_TOOLCHAIN_SIMD
ZFS_AC_CONFIG_ALWAYS_TOOLCHAIN_CFI_PSEUDO_OP
ZFS_AC_CONFIG_ALWAYS_SYSTEM
ZFS_AC_CONFIG_ALWAYS_ARCH
ZFS_AC_CONFIG_CHECK_ARCH_VAR