diff options
Diffstat (limited to 'config')
| -rw-r--r-- | config/Rules.am | 1 | ||||
| -rw-r--r-- | config/always-compiler-options.m4 | 23 | ||||
| -rw-r--r-- | config/zfs-build.m4 | 1 |
3 files changed, 25 insertions, 0 deletions
diff --git a/config/Rules.am b/config/Rules.am index be80c1e9c..20779ba49 100644 --- a/config/Rules.am +++ b/config/Rules.am @@ -26,6 +26,7 @@ AM_LIBTOOLFLAGS = --silent AM_CFLAGS = -std=gnu99 -Wall -Wstrict-prototypes -Wmissing-prototypes AM_CFLAGS += -fno-strict-aliasing AM_CFLAGS += $(NO_OMIT_FRAME_POINTER) +AM_CFLAGS += $(IMPLICIT_FALLTHROUGH) AM_CFLAGS += $(DEBUG_CFLAGS) AM_CFLAGS += $(ASAN_CFLAGS) AM_CFLAGS += $(CODE_COVERAGE_CFLAGS) $(NO_FORMAT_ZERO_LENGTH) 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], [ diff --git a/config/zfs-build.m4 b/config/zfs-build.m4 index 1af4356cd..27041c054 100644 --- a/config/zfs-build.m4 +++ b/config/zfs-build.m4 @@ -211,6 +211,7 @@ AC_DEFUN([ZFS_AC_CONFIG_ALWAYS], [ ZFS_AC_CONFIG_ALWAYS_CC_NO_UNUSED_BUT_SET_VARIABLE ZFS_AC_CONFIG_ALWAYS_CC_NO_BOOL_COMPARE + ZFS_AC_CONFIG_ALWAYS_CC_IMPLICIT_FALLTHROUGH ZFS_AC_CONFIG_ALWAYS_CC_FRAME_LARGER_THAN ZFS_AC_CONFIG_ALWAYS_CC_NO_FORMAT_TRUNCATION ZFS_AC_CONFIG_ALWAYS_CC_NO_FORMAT_ZERO_LENGTH |