[PATCH v2] Makefile: enable -Werror=implicit-int and -Werror=strict-prototypes by default

[Sergei Trofimovich]

The common error type 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 fata error. Tested on x86_64 allyesconfig.

Signed-off-by: Sergei Trofimovich <slyfox@xxxxxxxxxx>
Cc: Michal Marek <mmarek@xxxxxxx>
Cc: linux-kbuild@xxxxxxxxxxxxxxx
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
 Makefile | 5 +++++
 1 file changed, 5 insertions(+)

Change since v1:
 - use 'cc-option' to respect old gccs
 - fix typos. Thanks to Oleg Verych

diff --git a/Makefile b/Makefile
index 6e48848..53f4776 100644
--- a/Makefile
+++ b/Makefile
@@ -374,6 +374,11 @@ KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 		   -Werror-implicit-function-declaration \
 		   -Wno-format-security \
 		   -fno-delete-null-pointer-checks
+
+# not universally available, but nice to have ones
+KBUILD_CFLAGS   +=  $(call cc-option,-Werror=implicit-int) \
+		    $(call cc-option,-Werror=strict-prototypes)
+
 KBUILD_AFLAGS_KERNEL :=
 KBUILD_CFLAGS_KERNEL :=
 KBUILD_AFLAGS   := -D__ASSEMBLY__
-- 
1.8.3.2

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