Add a config option "ERROR_ON_WARNING" that adds the "-Werror" flag to
gcc, which turns warnings into errors.
This option enables developers to set a stricter level of code checking
for kernel code: all code must be warning-free.
Signed-off-by: Simon Que <s...@chromium.org>
Signed-off-by: Mandeep Singh Baines <m...@chromium.org>
---
Makefile | 4 ++++
lib/Kconfig.debug | 9 +++++++++
2 files changed, 13 insertions(+), 0 deletions(-)
diff --git a/Makefile b/Makefile
index a687963..7502f5f 100644
--- a/Makefile
+++ b/Makefile
@@ -620,6 +620,10 @@ endif
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
CHECKFLAGS += $(NOSTDINC_FLAGS)
+ifdef CONFIG_ERROR_ON_WARNING
+KBUILD_CFLAGS += -Werror
+endif
+
# warn about C99 declaration after statement
KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 83b2558..28005ff 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1305,3 +1305,12 @@ source "lib/Kconfig.kmemcheck"
config TEST_KSTRTOX
tristate "Test kstrto*() family of functions at runtime"
+
+config ERROR_ON_WARNING
+ bool "Treat compiler warnings as errors"
+ help
+ If you say Y here, the Makefile will pass the "-Werror" option to the
+ compiler. This will cause the compiler to fail on any warning, as if
+ it were an error.
+
+ If unsure, say N.
--
1.7.8.6
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