Add a 'W=1' Makefile switch which adds additional checking per build object. The idea behind this option is targeted at developers who, in the process of writing their code, want to do the occasional make W=1 [target.o] and let gcc do more extensive code checking for them. Then, they could eyeball the output for valid gcc warnings about various bugs/discrepancies which are not reported during the normal build process. For more background information and a use case, read through this thread: http://marc.info/?i=20110218091716.GA4384@bicker Cc: Ingo Molnar <mingo@xxxxxxx> Cc: Michal Marek <mmarek@xxxxxxx> Cc: linux-kbuild@xxxxxxxxxxxxxxx Signed-off-by: Borislav Petkov <bp@xxxxxxxxx> --- Makefile | 31 +++++++++++++++++++++++++++++++ 1 files changed, 31 insertions(+), 0 deletions(-) diff --git a/Makefile b/Makefile index c9c8c8f..a783a69 100644 --- a/Makefile +++ b/Makefile @@ -102,6 +102,10 @@ ifeq ("$(origin O)", "command line") KBUILD_OUTPUT := $(O) endif +ifeq ("$(origin W)", "command line") + KBUILD_ENABLE_EXTRA_WARNINGS = 1 +endif + # That's our default target when none is given on the command line PHONY := _all _all: @@ -363,6 +367,32 @@ KBUILD_AFLAGS_MODULE := -DMODULE KBUILD_CFLAGS_MODULE := -DMODULE KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds +ifdef KBUILD_ENABLE_EXTRA_WARNINGS +KBUILD_CFLAGS += -Wextra -Wno-unused +KBUILD_CFLAGS += -Waggregate-return +KBUILD_CFLAGS += -Wbad-function-cast +KBUILD_CFLAGS += -Wcast-qual +KBUILD_CFLAGS += -Wcast-align +KBUILD_CFLAGS += -Wconversion +KBUILD_CFLAGS += -Wdisabled-optimization +KBUILD_CFLAGS += -Wlogical-op +KBUILD_CFLAGS += -Wmissing-declarations +KBUILD_CFLAGS += -Wmissing-format-attribute +KBUILD_CFLAGS += -Wmissing-include-dirs +KBUILD_CFLAGS += -Wmissing-prototypes +KBUILD_CFLAGS += -Wnested-externs +KBUILD_CFLAGS += -Wold-style-definition +KBUILD_CFLAGS += -Woverlength-strings +KBUILD_CFLAGS += -Wpacked +KBUILD_CFLAGS += -Wpacked-bitfield-compat +KBUILD_CFLAGS += -Wpadded +KBUILD_CFLAGS += -Wpointer-arith +KBUILD_CFLAGS += -Wredundant-decls +KBUILD_CFLAGS += -Wshadow +KBUILD_CFLAGS += -Wswitch-default +KBUILD_CFLAGS += -Wvla +endif + # Read KERNELRELEASE from include/config/kernel.release (if it exists) KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION) @@ -1262,6 +1292,7 @@ help: @echo ' make O=dir [targets] Locate all output files in "dir", including .config' @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' @echo ' make C=2 [targets] Force check of all c source with $$CHECK' + @echo ' make W=1 [targets] Enable extra gcc checks' @echo '' @echo 'Execute "make" or "make all" to build all targets marked with [*] ' @echo 'For further info see the ./README file' -- 1.7.4.1.48.g5673d -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
