Hi Linus.
Please apply following fix.
Pull from:
ssh://master.kernel.org/pub/scm/linux/kernel/git/sam/fix-kbuild.git
Sam
>From 69ee0b3522428a07ff1765446d631ecc7da6ae0f Mon Sep 17 00:00:00 2001
From: Sam Ravnborg <[email protected]>
Date: Sun, 4 Nov 2007 19:00:46 +0100
Subject: [PATCH] kbuild: do not pick up CFLAGS from the environment
MIME-Version: 1.0
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Too many people have CFLAGS set to support building userspace.
And now Kbuild picks up CFLAGS this caused troubles.
Although people should realise that setting CFLAGS has
a 'global' effect the impact on the kernel build is a suprise.
So change kbuild to pick up value from KCFLAGS that is
much less used.
When kbuild pick up a value it will warn like this:
Makefile:544: "WARNING: Appending $KCFLAGS (-O3) from environment to kernel $CFLAGS"
Signed-off-by: Sam Ravnborg <[email protected]>
Cc: Thomas Bächler <[email protected]>
Cc: David Miller <[email protected]>
Cc: Ingo Molnar <[email protected]>
---
Makefile | 19 ++++++++++++++++---
1 files changed, 16 insertions(+), 3 deletions(-)
diff --git a/Makefile b/Makefile
index 188c3b6..cb740d4 100644
--- a/Makefile
+++ b/Makefile
@@ -528,9 +528,22 @@ KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
-KBUILD_CPPFLAGS += $(CPPFLAGS)
-KBUILD_AFLAGS += $(AFLAGS)
-KBUILD_CFLAGS += $(CFLAGS)
+# But warn user when we do so
+warn-assign = \
+$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
+
+ifneq ($(KCPPFLAGS),)
+ $(call warn-assign,CPPFLAGS)
+ KBUILD_CPPFLAGS += $(KCPPFLAGS)
+endif
+ifneq ($(KAFLAGS),)
+ $(call warn-assign,AFLAGS)
+ KBUILD_AFLAGS += $(KAFLAGS)
+endif
+ifneq ($(KCFLAGS),)
+ $(call warn-assign,CFLAGS)
+ KBUILD_CFLAGS += $(KCFLAGS)
+endif
# Use --build-id when available.
LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
--
1.5.3.4.1157.g0e74-dirty
-
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