Building kernel 2.6.21.3 for arm on cygwin

Hi Sam

enclosed is the 'k_smf.patch' which modifies three files to enable the kernel 2.6.21.3 to be built under cygwin:

host:  cygwin 1.5.24, hostcc= gcc 3.4.4
cross: arm-linux-uclibcgnueabi-gcc (GCC) 4.1.2
cmd:   make ARCH=arm CROSS_COMPILE=arm-linux- \

HOST_LOADLIBES="-lcurses -lintl" at91rm9200dk_defconfig

I verified that this does not break building on a linux-host on this config:

host:  FC5, gcc 4.1.1-1
cross: arm-none-linux-gnueabi-gcc 4.1.1
cmd:   make ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi-

Let me know if I can help any further. Tom

k_smf.patch:
------------
diff -Naur -r o21.1/scripts/mod/file2alias.c 2.6.21.1/scripts/mod/file2alias.c
--- o21.1/scripts/mod/file2alias.c 2007-04-27 14:49:26.000000000
-0700
+++ 2.6.21.1/scripts/mod/file2alias.c 2007-05-29 20:35:01.209115300
-0700
@@ -29,7 +29,11 @@

#include <ctype.h>

+#ifdef __CYGWIN__
+typedef __uint32_t __u32;
+#else
typedef uint32_t __u32;
+#endif
typedef uint16_t __u16;
typedef unsigned char __u8;

diff -Naur -r o21.1/scripts/mod/modpost.h 2.6.21.1/scripts/mod/modpost.h

-0700
@@ -9,6 +9,11 @@
#include <unistd.h>
#include <elf.h>

+#ifdef __CYGWIN__
+typedef uint16_t Elf32_Section;
+typedef uint16_t Elf64_Section;
+#endif
+
#include "elfconfig.h"

#if KERNEL_ELFCLASS == ELFCLASS32

diff -Naur -r o21.1/scripts/mod/sumversion.c 2.6.21.1/scripts/mod/sumversion.c
--- o21.1/scripts/mod/sumversion.c 2007-04-27 14:49:26.000000000
-0700
+++ 2.6.21.1/scripts/mod/sumversion.c 2007-05-29 20:35:01.677856300
-0700
@@ -7,6 +7,7 @@
#include <ctype.h>
#include <errno.h>
#include <string.h>
+#include <limits.h>
#include "modpost.h"

/*

linux host error (old gcc!):
----------------------------

  CC      mm/bootmem.o
  CC      mm/filemap.o
  CC      mm/mempool.o
  CC      mm/oom_kill.o
  CC      mm/fadvise.o
  CC      mm/page_alloc.o

mm/page_alloc.c:684: warning: `setup_nr_node_ids' defined but not used /tmp/ccj7iwRd.s: Assembler messages:
/tmp/ccj7iwRd.s:3089: Error: .err encountered
make[1]: *** [mm/page_alloc.o] Error 1
make: *** [mm] Error 2

arm-linux-gcc (GCC) 3.3.2 20030820 (prerelease)
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Hi Tom.

Patch looks good. The last bit touching sumversion.c is not needed in latest kernel - we already include limits.h.

I need you to sign off the patch as per instruction in Documentation/SubmittingPatch.
Please do so and send me a new mail containing both changlog entry (the introduction part of your mail) and the patch itself.

Sam

Hi,

What about something like that for ncurses stuff ?

Matthieu

Index: scripts/kconfig/Makefile
===================================================================
RCS file: /soft/cvs/Linux/kernel/linux/scripts/kconfig/Makefile,v retrieving revision 1.1.1.1
retrieving revision 1.2

diff -u -r1.1.1.1 -r1.2
@@ -148,6 +148,13 @@
      else echo no ; fi)
 ifeq ($(KBUILD_HAVE_NLS),no)
 HOSTCFLAGS	+= -DKBUILD_NO_NLS
+else
+HOST_OS := $(shell uname -o)
+ifeq ($(HOST_OS),Cygwin)
+HOSTLOADLIBES_conf	= -lintl
+endif
+
+
 endif
 
 # generated files seem to need this to find local include files

Index: scripts/kconfig/lxdialog/check-lxdialog.sh
===================================================================
RCS file: /soft/cvs/Linux/kernel/linux/scripts/kconfig/lxdialog/check-lxdialog.sh,v retrieving revision 1.1.1.1
retrieving revision 1.2

diff -u -r1.1.1.1 -r1.2
@@ -19,6 +19,11 @@
 		echo '-lcurses'
 		exit
 	fi
+	$cc -print-file-name=libncurses.a | grep -q /
+	if [ $? -eq 0 ]; then
+		echo '-lintl -lncurses'
+		exit
+	fi
 	exit 1
 }
 

From: Tom Enderes <[email protected]>

The kernel build failed on cygwin hosts, because cygwin has slightly different typedefs compared to linux:
scripts/mod/file2alias.c:518: error: dereferencing pointer to incomplete
type
Two files, scripts/mod/file2alias.c and scripts/mod/modpost.h, were modified as follows:
Whever __CYGWIN__ is defined, __uint32 is defined as __uint32_t (instead of uint_32_t) and the missing ElfxxSection definitions are added.
These changes have been tested both on cygwin 1.5.24, hostcc=gcc 3.4.4 and on FC5, hostcc=gcc 4.1.1-1. Any tests on cygwin, with and without this change, were executed with the following set for make: HOST_LOADLIBES="-lcurses -lintl".

diff -Naur -r o21.1/scripts/mod/file2alias.c
2.6.21.1/scripts/mod/file2alias.c
--- o21.1/scripts/mod/file2alias.c 2007-04-27 14:49:26.000000000 -0700
+++ 2.6.21.1/scripts/mod/file2alias.c 2007-05-29 20:35:01.209115300
-0700
@@ -29,7 +29,11 @@

#include <ctype.h>

+#ifdef __CYGWIN__
+typedef __uint32_t __u32;
+#else
typedef uint32_t __u32;
+#endif
typedef uint16_t __u16;
typedef unsigned char __u8;

diff -Naur -r o21.1/scripts/mod/modpost.h 2.6.21.1/scripts/mod/modpost.h

-0700
@@ -9,6 +9,11 @@
#include <unistd.h>
#include <elf.h>

+#ifdef __CYGWIN__
+typedef uint16_t Elf32_Section;
+typedef uint16_t Elf64_Section;
+#endif
+
#include "elfconfig.h"

#if KERNEL_ELFCLASS == ELFCLASS32

Hi Matthieu.

Can you please try to tell what your patch actually does.

As for the part added in the MAkefile you pass -lintl for Cygwin - but I fail to see _why_ -lintl is needed.

The patch to check-lxdialog.sh is outdated.
Could I ask you to redo it againt latest version and again explains the _why_ part. The how part is obvious from the diff...

Do not get me worg. I would love to have Cygwin supported but I want it in the cleanest possible way.

Sam

This is what I got on cygwin:

In file included from scripts/mod/../../include/linux/input.h:19,
from scripts/mod/file2alias.c:41:
/usr/include/asm/types.h:21: error: conflicting types for '__u32' scripts/mod/file2alias.c:33: error: previous declaration of '__u32' was here scripts/mod/file2alias.c: In function `do_ieee1394_entry':
scripts/mod/file2alias.c:193: warning: unsigned int format, __u32 arg (arg 3) scripts/mod/file2alias.c:195: warning: unsigned int format, __u32 arg (arg 3) scripts/mod/file2alias.c:197: warning: unsigned int format, __u32 arg (arg 3) scripts/mod/file2alias.c:199: warning: unsigned int format, __u32 arg (arg 3) scripts/mod/file2alias.c: In function `do_pci_entry':
scripts/mod/file2alias.c:221: warning: unsigned int format, __u32 arg (arg 3) scripts/mod/file2alias.c:222: warning: unsigned int format, __u32 arg (arg 3) scripts/mod/file2alias.c:223: warning: unsigned int format, __u32 arg (arg 3) scripts/mod/file2alias.c:224: warning: unsigned int format, __u32 arg (arg 3) scripts/mod/file2alias.c: In function `do_pcmcia_entry':
scripts/mod/file2alias.c:346: warning: unsigned int format, long unsigned int ar g (arg 3)
scripts/mod/file2alias.c:347: warning: unsigned int format, long unsigned int ar g (arg 3)
scripts/mod/file2alias.c:348: warning: unsigned int format, long unsigned int ar g (arg 3)
scripts/mod/file2alias.c:349: warning: unsigned int format, long unsigned int ar g (arg 3)
scripts/mod/file2alias.c: In function `do_parisc_entry':
scripts/mod/file2alias.c:469: warning: unsigned int format, __u32 arg (arg 3) make[2]: *** [scripts/mod/file2alias.o] Error 1
make[1]: *** [scripts/mod] Error 2
make: *** [scripts] Error 2

It is because I think .DLLs do not have something like ELF's DT_NEEDED, hence needing to specify all libs you ever need explicitly. Quite ugly.

Jan

Hi Sam,

If I don't do it, I got [1] or [2].

Matthieu

[1]
scripts/kconfig/conf.o:conf.c:(.text+0x91): undefined reference to _libintl_gettext' scripts/kconfig/conf.o:conf.c:(.text+0xa5): undefined reference to _libintl_gettext' scripts/kconfig/conf.o:conf.c:(.text+0xb9): undefined reference to _libintl_gettext' scripts/kconfig/conf.o:conf.c:(.text+0x7b8): undefined reference to _libintl_gettext' scripts/kconfig/conf.o:conf.c:(.text+0xf19): undefined reference to _libintl_gettext' scripts/kconfig/conf.o:conf.c:(.text+0x1026): more undefined references to _libintl_gettext' follow
collect2: ld returned 1 exit status

[2]
scripts/kconfig/mconf.o:mconf.c:(.text+0x923): undefined reference to _libintl_gettext' scripts/kconfig/mconf.o:mconf.c:(.text+0x9c9): undefined reference to _libintl_gettext' scripts/kconfig/mconf.o:mconf.c:(.text+0xa66): undefined reference to _libintl_gettext' scripts/kconfig/mconf.o:mconf.c:(.text+0xa91): undefined reference to _libintl_gettext' scripts/kconfig/mconf.o:mconf.c:(.text+0xab1): undefined reference to _libintl_gettext' scripts/kconfig/mconf.o:mconf.c:(.text+0xadd): more undefined references to _libintl_gettext' follow scripts/kconfig/mconf.o:mconf.c:(.text+0x11af): undefined reference to _libintl_bindtextdomain' scripts/kconfig/mconf.o:mconf.c:(.text+0x11bb): undefined reference to _libintl_textdomain' scripts/kconfig/mconf.o:mconf.c:(.text+0x1207): undefined reference to _libintl_gettext' scripts/kconfig/mconf.o:mconf.c:(.text+0x1414): undefined reference to _libintl_gettext' scripts/kconfig/mconf.o:mconf.c:(.text+0x1467): undefined reference to _libintl_gettext' scripts/kconfig/mconf.o:mconf.c:(.text+0x1482): undefined reference to _libintl_gettext' scripts/kconfig/mconf.o:mconf.c:(.text+0x14af): undefined reference to _libintl_gettext' scripts/kconfig/zconf.tab.o:zconf.tab.c:(.text+0x54e6): more undefined references to _libintl_gettext' follow
Info: resolving _stdscr by linking to __imp__stdscr (auto-import)
Info: resolving _COLS by linking to __imp__COLS (auto-import)
Info: resolving _LINES by linking to __imp__LINES (auto-import)
collect2: ld returned 1 exit status

Hi Tom.

I have revisited this and have made a successfull kernel build on a windows/cygwin box now.

I had to change two things only:
1) The -lintl workaround was fixed by introducing a little script. If gcc cannot link a program that sues gettext then NLS is disabled.

2) Elf32_Section and Elf64_Section was replaced by Elfnn_Half

The build succeeds with a number of warnings that I just ignored. fixdep and friends always get rebuild because kbuild does not know about the .exe suffix so it does not
see that the binaries exists.
This is annoying and I hope to fix it before the merge.

These change will hit mainline during next merge window so it will take a while before you can benefit.

For now they are in the kbuild.git tree at git.kernel.org and will soon be part of -mm.

Sam