Message-ID: <20061028230730.GA28966@quickstop.soohrt.org>
Date:	Sun, 29 Oct 2006 01:07:30 +0200
From:	Horst Schirmeier <horst@...irmeier.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	Andi Kleen <ak@...e.de>, Jan Beulich <jbeulich@...ell.com>,
	Sam Ravnborg <sam@...nborg.org>, jpdenheijer@...il.com,
	linux-kernel@...r.kernel.org, dsd@...too.org, draconx@...il.com,
	kernel@...too.org
Subject: [PATCH -mm] replacement for broken kbuild-dont-put-temp-files-in-the-source-tree.patch

Hello,

the kbuild-dont-put-temp-files-in-the-source-tree.patch (-mm patches) is
implemented faultily and fails in its intention to put temporary files
in $TMPDIR (or /tmp by default).

This is the code as it results from the patch:

ASTMP = $(shell mktemp ${TMPDIR:-/tmp}/asXXXXXX)
as-instr = $(shell if echo -e "$(1)" | $(AS) >/dev/null 2>&1 -W -Z -o $ASTMP ; \
 		   then echo "$(2)"; else echo "$(3)"; fi; \
	           rm -f $ASTMP)

1) $ needs to be escaped in the shell function call, otherwise make
   tries to substitute with a (in this case not existing) make variable
   with this name.

2) Makefile variable names need to be put in parentheses; $ASTMP is
   being interpreted as $(A)STMP, resulting in as-instr writing to a file
   named after whatever is in $(A), followed by "STMP".

3) ld-option also writes to a temporary file and needs the same
   treatment.

Please consider using the corrected patch below instead. Alternatively,
we could also simply use -o /dev/null, as we are not interested in the
output anyways. Daniel Drake already suggested this in a LKML post
(message-id 452F9602.1050906@...too.org).

It would also be nice if this would make it into the mainline kernel
before 2.6.19 gets released; this would help avoiding the sandbox
violation problems on Gentoo Linux [1] [2].

Kind regards,
 Horst Schirmeier

[1] http://bugs.gentoo.org/show_bug.cgi?id=149307
[2] LKML Message-ID: <451ABE0E.2030904@....de>

---
http://bugzilla.kernel.org/show_bug.cgi?id=7261 berates us for putting a
temporary file into the kernel source tree.  Use mktemp instead.

Cc: Andi Kleen <ak@...e.de>
Cc: Jan Beulich <jbeulich@...ell.com>
Cc: Sam Ravnborg <sam@...nborg.org>
Cc: jpdenheijer@...il.com,
Signed-off-by: Horst Schirmeier <horst@...irmeier.com>
---

 Kbuild.include |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

--- linux-mm/scripts/Kbuild.include.orig	2006-10-29 00:39:35.000000000 +0200
+++ linux-mm/scripts/Kbuild.include	2006-10-29 00:41:43.000000000 +0200
@@ -66,9 +66,10 @@ as-option = $(shell if $(CC) $(CFLAGS) $
 # as-instr
 # Usage: cflags-y += $(call as-instr, instr, option1, option2)
 
-as-instr = $(shell if echo -e "$(1)" | $(AS) >/dev/null 2>&1 -W -Z -o astest$$$$.out ; \
+ASTMP = $(shell mktemp $${TMPDIR:-/tmp}/asXXXXXX)
+as-instr = $(shell if echo -e "$(1)" | $(AS) >/dev/null 2>&1 -W -Z -o $(ASTMP) ; \
 		   then echo "$(2)"; else echo "$(3)"; fi; \
-	           rm -f astest$$$$.out)
+	           rm -f $(ASTMP))
 
 # cc-option
 # Usage: cflags-y += $(call cc-option, -march=winchip-c6, -march=i586)
@@ -97,10 +98,11 @@ cc-ifversion = $(shell if [ $(call cc-ve
 
 # ld-option
 # Usage: ldflags += $(call ld-option, -Wl$(comma)--hash-style=both)
+LDTMP = $(shell mktemp $${TMPDIR:-/tmp}/ldXXXXXX)
 ld-option = $(shell if $(CC) $(1) \
-			     -nostdlib -o ldtest$$$$.out -xc /dev/null \
+			     -nostdlib -o $(LDTMP) -xc /dev/null \
              > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi; \
-	     rm -f ldtest$$$$.out)
+	     rm -f $(LDTMP))
 
 ###
 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
-
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