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Diffstat (limited to 'config/always-compiler-options.m4')
| -rw-r--r-- | config/always-compiler-options.m4 | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/config/always-compiler-options.m4 b/config/always-compiler-options.m4 index a84123317..ce84f7e60 100644 --- a/config/always-compiler-options.m4 +++ b/config/always-compiler-options.m4 @@ -162,6 +162,29 @@ AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_NO_UNUSED_BUT_SET_VARIABLE], [ ]) dnl # +dnl # Check if gcc supports -Wimplicit-fallthrough option. +dnl # +AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_IMPLICIT_FALLTHROUGH], [ + AC_MSG_CHECKING([whether $CC supports -Wimplicit-fallthrough]) + + saved_flags="$CFLAGS" + CFLAGS="$CFLAGS -Werror -Wimplicit-fallthrough" + + AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [ + IMPLICIT_FALLTHROUGH=-Wimplicit-fallthrough + AC_DEFINE([HAVE_IMPLICIT_FALLTHROUGH], 1, + [Define if compiler supports -Wimplicit-fallthrough]) + AC_MSG_RESULT([yes]) + ], [ + IMPLICIT_FALLTHROUGH= + AC_MSG_RESULT([no]) + ]) + + CFLAGS="$saved_flags" + AC_SUBST([IMPLICIT_FALLTHROUGH]) +]) + +dnl # dnl # Check if gcc supports -fno-omit-frame-pointer option. dnl # AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_NO_OMIT_FRAME_POINTER], [ |