XOR/mint0x33
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Add option to enable -Wframe-larger-than= on gcc 4.4

Browse source 
Add option to enable -Wframe-larger-than= on gcc 4.4

gcc mainline (upcoming 4.4) added a new -Wframe-larger-than=...
option to warn at build time about too large stack frames. Add a config
option to enable this warning, since this very useful for the kernel.

I choose (somewhat arbitarily) 2048 as default warning threshold for 64bit
and 1024 as default for 32bit architectures.  With some research and
fixing all the code for smaller values these defaults should be probably
lowered.

With the default allyesconfigs have some new warnings, but I think
that is all code that should be just fixed.

At some point (when gcc 4.4 is released and widely used) this should
obsolete make checkstack

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
This commit is contained in:
Andi Kleen 2008-02-22 15:15:03 +01:00 • committed by Sam Ravnborg
parent 80ff262416
commit 35bb5b1e0e
2 changed files with 15 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

4
Makefile
View file

@ -507,6 +507,10 @@ else
KBUILD_CFLAGS += -O2
endif
ifneq (CONFIG_FRAME_WARN,0)
KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
endif
# Force gcc to behave correct even for buggy distributions
# Arch Makefiles may override this setting
KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)