Messages in this thread Patch in this message | | | Date | Wed, 10 Nov 2004 02:45:16 +0100 | From | Adrian Bunk <> | Subject | [2.6 patch] Use -ffreestanding? |
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On Tue, Nov 09, 2004 at 06:01:07AM +0100, Andi Kleen wrote: > > Why doesn't the kernel use -ffreestanding which should prevent all such > > problems? > > Because we want most of these optimizations. Also with -ffreestanding
Do we really want the compiler to silently replace in-kernel functions with built-ins?
You can still do an explicit #define strlen __builtin_strlen if you want to use a gcc built-in function.
> you would need to supply the out of line string functions anyways > because gcc wouldn't inline them.
At least with gcc 3.4.2 on i386 adding -ffreestanding and your (i386-specific) IN_STRING_C hack removed compiles fine.
> -Andi
I'm open for examples why this actually doesn't work, but after my (limited) testin I'd suggest the patch below for inclusion in the next -mm.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
--- linux-2.6.10-rc1-mm4-full-ffreestanding/Makefile.old 2004-11-09 22:27:06.000000000 +0100 +++ linux-2.6.10-rc1-mm4-full-ffreestanding/Makefile 2004-11-09 22:27:47.000000000 +0100 @@ -349,7 +349,8 @@ CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE) CFLAGS := -Wall -Wstrict-prototypes -Wno-trigraphs \ - -fno-strict-aliasing -fno-common + -fno-strict-aliasing -fno-common \ + -ffreestanding AFLAGS := -D__ASSEMBLY__ export VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION LOCALVERSION KERNELRELEASE \
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