Date:	Fri, 08 Jun 2007 18:47:46 -0700
From:	Tom <fivemiletom@...il.com>
To:	Sam Ravnborg <sam@...nborg.org>
CC:	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.arm.linux.org.uk
Subject: Re: [PATCH 2.6.21.3] kbuild: fix build for cygwin

Sam Ravnborg wrote:
> On Fri, Jun 08, 2007 at 11:32:29AM -0700, Tom wrote:
>> From: Tom Enderes <enderes@...il.com>
>>
>> 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".
>>
>> Signed-off-by: Tom Enderes <enderes@...il.com>
>>
>>
>> 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;
> This change is wrong.
> Somehow __uint32_t_defined gets defined and cygwin fails to define
> uint32_t.
> 
> So we have hit a bug in cygwin here.
> 
> Browsing the code I think that including inttypes.h much sooner will fix it.
> In file2alias.c I moved include of inttypes.h up.
> 
>  
>> diff -Naur -r o21.1/scripts/mod/modpost.h 2.6.21.1/scripts/mod/modpost.h
>> --- o21.1/scripts/mod/modpost.h    2007-04-27 14:49:26.000000000 -0700
>> +++ 2.6.21.1/scripts/mod/modpost.h    2007-05-29 20:35:01.599732800
>> -0700
>> @@ -9,6 +9,11 @@
>>  #include <unistd.h>
>>  #include <elf.h>
>>
>> +#ifdef __CYGWIN__
>> +typedef uint16_t Elf32_Section;
>> +typedef uint16_t Elf64_Section;
>> +#endif
> 
> I did this in an alternative way.
> Replacing use of Elf32_section with Elf32_Half did the trick.
> Same for the 64 bit type.
> 
> 
> Let me know if this works on Cygwin.

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


> I have tested with a few architectures on Linux with success.
> 
> (Needs to look into the lib part next).
> 
> Thanks for keeping attention on this.
> 
> 	Sam
> 
> diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
> index f646381..5e017a9 100644
> --- a/scripts/mod/file2alias.c
> +++ b/scripts/mod/file2alias.c
> @@ -10,6 +10,14 @@
>   * of the GNU General Public License, incorporated herein by reference.
>   */
>  
> +#ifdef __sun__
> +#include <inttypes.h>
> +#else
> +#include <stdint.h>
> +#endif
> +
> +#include <ctype.h>
> +
>  #include "modpost.h"
>  
>  /* We use the ELF typedefs for kernel_ulong_t but bite the bullet and
> @@ -21,13 +29,6 @@ typedef Elf32_Addr	kernel_ulong_t;
>  typedef Elf64_Addr	kernel_ulong_t;
>  #define BITS_PER_LONG 64
>  #endif
> -#ifdef __sun__
> -#include <inttypes.h>
> -#else
> -#include <stdint.h>
> -#endif
> -
> -#include <ctype.h>
>  
>  typedef uint32_t	__u32;
>  typedef uint16_t	__u16;
> diff --git a/scripts/mod/modpost.h b/scripts/mod/modpost.h
> index 4156dd3..0ffed17 100644
> --- a/scripts/mod/modpost.h
> +++ b/scripts/mod/modpost.h
> @@ -17,7 +17,7 @@
>  #define Elf_Shdr    Elf32_Shdr
>  #define Elf_Sym     Elf32_Sym
>  #define Elf_Addr    Elf32_Addr
> -#define Elf_Section Elf32_Section
> +#define Elf_Section Elf32_Half
>  #define ELF_ST_BIND ELF32_ST_BIND
>  #define ELF_ST_TYPE ELF32_ST_TYPE
>  
> @@ -31,7 +31,7 @@
>  #define Elf_Shdr    Elf64_Shdr
>  #define Elf_Sym     Elf64_Sym
>  #define Elf_Addr    Elf64_Addr
> -#define Elf_Section Elf64_Section
> +#define Elf_Section Elf64_Half
>  #define ELF_ST_BIND ELF64_ST_BIND
>  #define ELF_ST_TYPE ELF64_ST_TYPE
>  
> 

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