[mirror_zfs.git] / config / user-libatomic.m4

dnl #
dnl # If -latomic exists and atomic.c doesn't link without it,
dnl # it's needed for __atomic intrinsics.
dnl #
AC_DEFUN([ZFS_AC_CONFIG_USER_LIBATOMIC], [
	AC_MSG_CHECKING([whether -latomic is required])

	saved_libs="$LIBS"
	LIBS="$LIBS -latomic"
	LIBATOMIC_LIBS=""

	AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], [
		LIBS="$saved_libs"
		saved_cflags="$CFLAGS"
		CFLAGS="$CFLAGS -isystem lib/libspl/include"
		AC_LINK_IFELSE([AC_LANG_PROGRAM([#include "lib/libspl/atomic.c"], [])], [], [LIBATOMIC_LIBS="-latomic"])
		CFLAGS="$saved_cflags"
	])

	if test -n "$LIBATOMIC_LIBS"; then
		AC_MSG_RESULT([yes])
	else
		AC_MSG_RESULT([no])
	fi

	LIBS="$saved_libs"
	AC_SUBST([LIBATOMIC_LIBS])
])
Commit	Line	Data
fef8bd41	1	dnl #
d9f0f158 AZ	2	dnl # If -latomic exists and atomic.c doesn't link without it,
d9f0f158 AZ	3	dnl # it's needed for __atomic intrinsics.
fef8bd41 AZ	4	dnl #
fef8bd41 AZ	5	AC_DEFUN([ZFS_AC_CONFIG_USER_LIBATOMIC], [
d9f0f158	6	AC_MSG_CHECKING([whether -latomic is required])
fef8bd41 AZ	7
	8	saved_libs="$LIBS"
	9	LIBS="$LIBS -latomic"
d9f0f158	10	LIBATOMIC_LIBS=""
fef8bd41 AZ	11
fef8bd41 AZ	12	AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], [
d9f0f158 AZ	13	LIBS="$saved_libs"
	14	saved_cflags="$CFLAGS"
	15	CFLAGS="$CFLAGS -isystem lib/libspl/include"
	16	AC_LINK_IFELSE([AC_LANG_PROGRAM([#include "lib/libspl/atomic.c"], [])], [], [LIBATOMIC_LIBS="-latomic"])
	17	CFLAGS="$saved_cflags"
	18	])
	19
	20	if test -n "$LIBATOMIC_LIBS"; then
fef8bd41	21	AC_MSG_RESULT([yes])
d9f0f158	22	else
fef8bd41	23	AC_MSG_RESULT([no])
d9f0f158	24	fi
fef8bd41 AZ	25
	26	LIBS="$saved_libs"
	27	AC_SUBST([LIBATOMIC_LIBS])
	28	])