Re: [2.6.16rc2] compile error

[Sam Ravnborg]

On Fri, Feb 03, 2006 at 07:55:47PM +0100, Alexander Fieroch wrote:
> Hello,
> 
> I can't compile kernel 2.6.16-rc[12] and get the following error:
> 
> # make
> /bin/sh: -c: line 0: syntax error near unexpected token `('
> /bin/sh: -c: line 0: `set -e; echo '  CHK     include/linux/version.h';
> mkdir -p include/linux/;        if [ `echo -n "2.6.16-rc2 .file null
> .ident GCC:(GNU)4.0.320060128(prerelease)(Debian4.0.2-8) .section
> .note.GNU-stack,,@progbits" | wc -c ` -gt 64 ]; then echo '"2.6.16-rc2
> .file null .ident GCC:(GNU)4.0.320060128(prerelease)(Debian4.0.2-8)
> .section .note.GNU-stack,,@progbits" exceeds 64 characters' >&2; exit 1;
> fi; (echo \#define UTS_RELEASE \"2.6.16-rc2 .file null .ident
> GCC:(GNU)4.0.320060128(prerelease)(Debian4.0.2-8) .section
> .note.GNU-stack,,@progbits\"; echo \#define LINUX_VERSION_CODE `expr 2
> \\* 65536 + 6 \\* 256 + 16`; echo '#define KERNEL_VERSION(a,b,c) (((a)
> << 16) + ((b) << 8) + (c))'; ) < /usr/src/linux-2.6.16rc2/Makefile >
> include/linux/version.h.tmp; if [ -r include/linux/version.h ] && cmp -s
> include/linux/version.h include/linux/version.h.tmp; then rm -f
> include/linux/version.h.tmp; else echo '  UPD
> include/linux/version.h'; mv -f include/linux/version.h.tmp
> include/linux/version.h; fi'
> make: *** [include/linux/version.h] Error 2

You are hit be an outstanding issue with -rc1 + rc2.
When you build as root you will alter /dev/null and in your case it
became a regular file.

Recreate /dev/null and build as normal user for now.
You can apply patch below to fix it - will be in next -rc.

	Sam

diff-tree 3835f82183eab8b67ddda6b32c127859a546c82d (from 3ee68c4af3fd7228c1be63254b9f884614f9ebb2)
Author: Sam Ravnborg <sam@xxxxxxxxxxxxxxxxx>
Date:   Sat Jan 21 12:03:09 2006 +0100

    kconfig: fix /dev/null breakage
    
    While running "make menuconfig" and "make mrproper"
    some people experienced that /dev/null suddenly changed
    permissions or suddenly became a regular file.
    The main reason was that /dev/null was used as output
    to gcc in the check-lxdialog.sh script and gcc did
    some strange things with the output file; in this
    case /dev/null when it errorred out.
    
    Following patch implements a suggestion
    from Bryan O'Sullivan <bos@xxxxxxxxxxxxxx> to
    use gcc -print-file-name=libxxx.so.
    
    Also the Makefile is adjusted to not resolve value of
    HOST_EXTRACFLAGS and HOST_LOADLIBES until they are actually used.
    This prevents us from calling gcc when running make *clean/mrproper
    
    Thanks to Eyal Lebedinsky <eyal@xxxxxxxxxxxxxx> and
    Jean Delvare <khali@xxxxxxxxxxxx> for the first error reports.
    
    Signed-off-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
    ---

diff --git a/scripts/kconfig/lxdialog/Makefile b/scripts/kconfig/lxdialog/Makefile
index fae3e29..bbf4887 100644
--- a/scripts/kconfig/lxdialog/Makefile
+++ b/scripts/kconfig/lxdialog/Makefile
@@ -1,11 +1,14 @@
 # Makefile to build lxdialog package
 #
 
 check-lxdialog  := $(srctree)/$(src)/check-lxdialog.sh
-HOST_EXTRACFLAGS:= $(shell $(CONFIG_SHELL) $(check-lxdialog) -ccflags)
-HOST_LOADLIBES  := $(shell $(CONFIG_SHELL) $(check-lxdialog) -ldflags $(HOSTCC))
+
+# Use reursively expanded variables so we do not call gcc unless
+# we really need to do so. (Do not call gcc as part of make mrproper)
+HOST_EXTRACFLAGS = $(shell $(CONFIG_SHELL) $(check-lxdialog) -ccflags)
+HOST_LOADLIBES   = $(shell $(CONFIG_SHELL) $(check-lxdialog) -ldflags $(HOSTCC))
  
 HOST_EXTRACFLAGS += -DLOCALE 
 
 .PHONY: dochecklxdialog
 $(obj)/dochecklxdialog:
diff --git a/scripts/kconfig/lxdialog/check-lxdialog.sh b/scripts/kconfig/lxdialog/check-lxdialog.sh
index 448e353..120d624 100644
--- a/scripts/kconfig/lxdialog/check-lxdialog.sh
+++ b/scripts/kconfig/lxdialog/check-lxdialog.sh
@@ -2,21 +2,21 @@
 # Check ncurses compatibility
 
 # What library to link
 ldflags()
 {
-	echo "main() {}" | $cc -lncursesw -xc - -o /dev/null 2> /dev/null
+	$cc -print-file-name=libncursesw.so | grep -q /
 	if [ $? -eq 0 ]; then
 		echo '-lncursesw'
 		exit
 	fi
-	echo "main() {}" | $cc -lncurses -xc - -o /dev/null 2> /dev/null
+	$cc -print-file-name=libncurses.so | grep -q /
 	if [ $? -eq 0 ]; then
 		echo '-lncurses'
 		exit
 	fi
-	echo "main() {}" | $cc -lcurses -xc - -o /dev/null 2> /dev/null
+	$cc -print-file-name=libcurses.so | grep -q /
 	if [ $? -eq 0 ]; then
 		echo '-lcurses'
 		exit
 	fi
 	exit 1
@@ -34,14 +34,17 @@ ccflags()
 	else
 		echo '-DCURSES_LOC="<curses.h>"'
 	fi
 }
 
-compiler=""
+# Temp file, try to clean up after us
+tmp=.lxdialog.tmp
+trap "rm -f $tmp" 0 1 2 3 15
+
 # Check if we can link to ncurses
 check() {
-	echo "main() {}" | $cc -xc - -o /dev/null 2> /dev/null
+	echo "main() {}" | $cc -xc - -o $tmp 2> /dev/null
 	if [ $? != 0 ]; then
 		echo " *** Unable to find the ncurses libraries."          1>&2
 		echo " *** make menuconfig require the ncurses libraries"  1>&2
 		echo " *** "                                               1>&2
 		echo " *** Install ncurses (ncurses-devel) and try again"  1>&2
@@ -57,10 +60,11 @@ usage() {
 if [ $# == 0 ]; then
 	usage
 	exit 1
 fi
 
+cc=""
 case "$1" in
 	"-check")
 		shift
 		cc="$@"
 		check
-
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