1dnl # 2dnl # If -latomic exists and atomic.c doesn't link without it, 3dnl # it's needed for __atomic intrinsics. 4dnl # 5AC_DEFUN([ZFS_AC_CONFIG_USER_LIBATOMIC], [ 6 AC_MSG_CHECKING([whether -latomic is required]) 7 8 saved_libs="$LIBS" 9 LIBS="$LIBS -latomic" 10 LIBATOMIC_LIBS="" 11 12 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], [ 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 "$LIBATOMIC_LIBS"; then 21 AC_MSG_RESULT([yes]) 22 else 23 AC_MSG_RESULT([no]) 24 fi 25 26 LIBS="$saved_libs" 27 AC_SUBST([LIBATOMIC_LIBS]) 28]) 29