linux-kernel - Re: [PATCH] kbuild: remove duplicate -I flag in addtree

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Date:	Mon, 4 Oct 2010 17:10:45 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	matt mooney <mfm@...eddisk.com>
Cc:	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] kbuild: remove duplicate -I flag in addtree

On Sun, Sep 26, 2010 at 07:11:12PM -0700, matt mooney wrote:
> When O= is used, any -I flag given that is not an absolute path gets
> duplicated. The $(1) appended to the conditional clause covers the
> absolute case, but due to being outside of the conditional statement
> it gets added everytime.
> 
> Signed-off-by: matt mooney <mfm@...eddisk.com>
> ---
>  scripts/Kbuild.include |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
> index ed2773e..08c74ed 100644
> --- a/scripts/Kbuild.include
> +++ b/scripts/Kbuild.include
> @@ -158,7 +158,7 @@ modbuiltin := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.modbuiltin obj
>  # Prefix -I with $(srctree) if it is not an absolute path.
>  # skip if -I has no parameter
>  addtree = $(if $(patsubst -I%,%,$(1)), \
> -$(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1))
> +$(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1)),$(1)))

$ mkdir _build-new; make O=_build-new defconfig; make O=_build-new V=1 all
fails with

  perl /home/mmarek/linux-2.6/kernel/timeconst.pl 1000 > kernel/timeconst.h
  gcc -Wp,-MD,kernel/.time.o.d  -nostdinc -isystem /usr/lib64/gcc/x86_64-suse-linux/4.5/include -I/home/mmarek/linux-2.6/arch/x86/include -Iinclude  -I/home/mmarek/linux-2.6/include -include include/generated/autoconf.h  -I/home/mmarek/linux-2.6/kernel -D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -Wno-format-security -fno-delete-null-pointer-checks -Os -m64 -mtune=generic -mno-red-zone -mcmodel=kernel -funit-at-a-time -maccumulate-outgoing-args -DCONFIG_AS_CFI=1 -DCONFIG_AS_CFI_SIGNAL_FRAME=1 -DCONFIG_AS_CFI_SECTIONS=1 -pipe -Wno-sign-compare -fno-asynchronous-unwind-tables -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -Wframe-larger-than=2048 -fno-stack-protector -fno-omit-frame-pointer -fno-optimize-sibling-calls -Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-overflow -fconserve-stack    -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(time)"  -D"KBUILD_MODNAME=KBUILD_STR(time)"  -c -o kernel/time.o /home/mmarek/linux-2.6/kernel/time.c
/home/mmarek/linux-2.6/kernel/time.c:44:23: fatal error: timeconst.h: No such file or directory

The correct gcc line without your patch is 
  gcc -Wp,-MD,kernel/.time.o.d  -nostdinc -isystem /usr/lib64/gcc/x86_64-suse-linux/4.5/include -I/home/mmarek/linux-2.6/arch/x86/include -Iinclude  -I/home/mmarek/linux-2.6/include -include include/generated/autoconf.h  -I/home/mmarek/linux-2.6/kernel -Ikernel -D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -Wno-format-security -fno-delete-null-pointer-checks -Os -m64 -mtune=generic -mno-red-zone -mcmodel=kernel -funit-at-a-time -maccumulate-outgoing-args -DCONFIG_AS_CFI=1 -DCONFIG_AS_CFI_SIGNAL_FRAME=1 -DCONFIG_AS_CFI_SECTIONS=1 -pipe -Wno-sign-compare -fno-asynchronous-unwind-tables -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -Wframe-larger-than=2048 -fno-stack-protector -fno-omit-frame-pointer -fno-optimize-sibling-calls -Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-overflow -fconserve-stack    -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(time)"  -D"KBUILD_MODNAME=KBUILD_STR(time)"  -c -o kernel/time.o /home/mmarek/linux-2.6/kernel/time.c

The difference is that with your patch it is lacking the -Ikernel
include, so it does not search for generated header files in $(obj).

Michal
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