[2/5,v2] kbuild: LLVMLinux: Adapt warnings for compilation with clang

Commit Message

Behan Webster March 6, 2014, 5:59 p.m. UTC

From: Jan-Simon Möller <[e-mail]>

When compiling kernel with clang, disable warnings which are too noisy, and
add the clang flag catch-undefined-behavior.

Re-enable warnings for self-assigns due to David Jones removing most of them
already from the kernel code base.

Signed-off-by: Jan-Simon Möller <[e-mail]>
Signed-off-by: Behan Webster <[e-mail]>
Signed-off-by: Mark Charlebois <[e-mail]>
Cc: PaX Team <[e-mail]>
---
 scripts/Makefile.build | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

Patch

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index d5d859c..5cd6651 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -65,12 +65,22 @@  warning-  := $(empty)
 warning-1 := -Wextra -Wunused -Wno-unused-parameter
 warning-1 += -Wmissing-declarations
 warning-1 += -Wmissing-format-attribute
-warning-1 += -Wmissing-prototypes
+warning-1 += $(call cc-option, -Wmissing-prototypes)
 warning-1 += -Wold-style-definition
 warning-1 += $(call cc-option, -Wmissing-include-dirs)
 warning-1 += $(call cc-option, -Wunused-but-set-variable)
 warning-1 += $(call cc-disable-warning, missing-field-initializers)
 
+# Clang
+warning-1 += $(call cc-disable-warning, initializer-overrides)
+warning-1 += $(call cc-disable-warning, unused-value)
+warning-1 += $(call cc-disable-warning, format)
+warning-1 += $(call cc-disable-warning, unknown-warning-option)
+warning-1 += $(call cc-disable-warning, sign-compare)
+warning-1 += $(call cc-disable-warning, format-zero-length)
+warning-1 += $(call cc-disable-warning, uninitialized)
+warning-1 += $(call cc-option, -fcatch-undefined-behavior)
+
 warning-2 := -Waggregate-return
 warning-2 += -Wcast-align
 warning-2 += -Wdisabled-optimization