From: Sergei Trofimovich <slyfox@xxxxxxxxxx>
Subject: ./Makefile: enable -Werror=implicit-int and -Werror=strict-prototypes by default
The common error found in forward-ported/backported patches is missing
headers. One recent example (files and function names are mangled):
void foo(){}
EXPORT_SYMBOL(foo);
gave only warning
foo.c:12345678:5: warning: function declaration isn't a prototype [-Wstrict-prototypes]
void foo(){}
^
foo.c:12345679:5: warning: data definition has no type or storage class [enabled by default]
EXPORT_SYMBOL(foo);
foo.c:12345679:5: warning: type defaults to 'int' in declaration of 'EXORT_SYMBOL' [-Werror=implicit-int]
Now it's a fatal error. Tested on x86_64 allyesconfig.
[akpm@xxxxxxxxxxxxxxxxxxxx: fix typos in comments]
Signed-off-by: Sergei Trofimovich <slyfox@xxxxxxxxxx>
Cc: Michal Marek <mmarek@xxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Makefile | 6 ++++++
1 file changed, 6 insertions(+)
diff -puN Makefile~makefile-enable-werror=implicit-int-and-werror=strict-prototypes-by-default Makefile
--- a/Makefile~makefile-enable-werror=implicit-int-and-werror=strict-prototypes-by-default
+++ a/Makefile
@@ -659,6 +659,12 @@ KBUILD_CFLAGS += $(call cc-option,-fno-s
# conserve stack if available
KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
+# disallow errors like 'EXPORT_GPL(foo);' with missing header
+KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
+
+# require functions to have arguments in prototypes, not empty 'int foo()'
+KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
+
# use the deterministic mode of AR if available
KBUILD_ARFLAGS := $(call ar-option,D)
_
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