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Fix atomic-alignment warnings in libspl on FreeBSD/i386

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On i386, Clang complains about misaligned atomic operations.  Silence
these warnings to fix the build on FreeBSD/i386.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:	Alan Somers <asomers@gmail.com>
Sponsored by:	ConnectWise
Closes #17708
This commit is contained in:
Alan Somers
2025-09-17 17:31:27 -06:00
committed by Brian Behlendorf
parent 15a6b982c5
commit 9c6f72021d
4 changed files with 26 additions and 0 deletions
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config/always-compiler-options.m4
+21
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@@ -209,6 +209,27 @@ AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_NO_CLOBBERED], [
AC_SUBST([NO_CLOBBERED])
])
dnl #
dnl # Check if cc supports -Wno-atomic-alignment option.
dnl #
AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_NO_ATOMIC_ALIGNMENT], [
AC_MSG_CHECKING([whether $CC supports -Wno-atomic-alignment])
saved_flags="$CFLAGS"
CFLAGS="$CFLAGS -Werror -Wno-atomic-alignment"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
NO_ATOMIC_ALIGNMENT=-Wno-atomic-alignment
AC_MSG_RESULT([yes])
], [
NO_ATOMIC_ALIGNMENT=
AC_MSG_RESULT([no])
])
CFLAGS="$saved_flags"
AC_SUBST([NO_ATOMIC_ALIGNMENT])
])
dnl #
dnl # Check if cc supports -Wimplicit-fallthrough option.
dnl #