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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])
])
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