linux-kernel - Re: [3.7-rc6] Build failure with scripts/Makefile.headersinst

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Date:	Sun, 3 Mar 2013 16:34:44 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:	dhowells@...hat.com, mmarek@...e.c, arnd@...db.de,
	tglx@...utronix.de, paulmck@...ux.vnet.ibm.com, davej@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [3.7-rc6] Build failure with scripts/Makefile.headersinst

On Mon, Mar 04, 2013 at 12:07:31AM +0900, Tetsuo Handa wrote:
> Sam Ravnborg wrote:
> > On Wed, Nov 28, 2012 at 01:55:14PM +0000, David Howells wrote:
> > > Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> wrote:
> > > 
> > > > Tetsuo Handa wrote:
> > > > > Linux 3.6 builds fine. I can't use "git bisect" until Linux 3.7-rc6 but
> > > > > possibly caused by either commit 10b63956 "UAPI: Plumb the UAPI Kbuilds
> > > > > into the user header installation and checking" or commit 40f1d4c2 "UAPI:
> > > > > Remove the objhdr-y export list".
> > > > 
> > > > Bisected to commit 10b63956 "UAPI: Plumb the UAPI Kbuilds into the user header
> > > > installation and checking".
> > > 
> > > Indeed, but that doesn't help much.  The problem is that make's behaviour has
> > > apparently changed.  I could do with Sam Ravnborg's help to work around this
> > > since I think he's mainly responsible for the Makefile infrastructure.
> > 
> > Mical is the kbuild person these days.
> > Anyway - it this still relevant?
> > 
> Yes, as of commit a7c1120d "Merge tag 'ext4_for_linus' of
> git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4" in linux.git still
> has this problem.
> 
> > I took a quick look and my suspect is the use of $(or ..),
> > as this feature was added recently to make.

Hi Tetsuo.

If my guess is correct this patch should help.
I have gmake 3.81 and I do nto see the beforementioned problem.

	Sam

diff --git a/scripts/Makefile.headersinst b/scripts/Makefile.headersinst
index 25f216a..477d137 100644
--- a/scripts/Makefile.headersinst
+++ b/scripts/Makefile.headersinst
@@ -14,7 +14,7 @@ kbuild-file := $(srctree)/$(obj)/Kbuild
 include $(kbuild-file)
 
 # called may set destination dir (when installing to asm/)
-_dst := $(or $(destination-y),$(dst),$(obj))
+_dst := $(if $(destination-y),$(destination-y),$(if $(dst),$(dst),$(obj)))
 
 old-kbuild-file := $(srctree)/$(subst uapi/,,$(obj))/Kbuild
 ifneq ($(wildcard $(old-kbuild-file)),)
@@ -48,13 +48,14 @@ all-files     := $(header-y) $(genhdr-y) $(wrapper-files)
 output-files  := $(addprefix $(installdir)/, $(all-files))
 
 input-files   := $(foreach hdr, $(header-y), \
-		   $(or \
+		   $(if $(wildcard $(srcdir)/$(hdr)), \
 			$(wildcard $(srcdir)/$(hdr)), \
-			$(wildcard $(oldsrcdir)/$(hdr)), \
-			$(error Missing UAPI file $(srcdir)/$(hdr)) \
+			$(if $(wildcard $(oldsrcdir)/$(hdr)), \
+				$(wildcard $(oldsrcdir)/$(hdr)), \
+				$(error Missing UAPI file $(srcdir)/$(hdr))) \
 		   )) \
 		 $(foreach hdr, $(genhdr-y), \
-		   $(or \
+		   $(if	$(wildcard $(gendir)/$(hdr)), \
 			$(wildcard $(gendir)/$(hdr)), \
 			$(error Missing generated UAPI file $(gendir)/$(hdr)) \
 		   ))
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