linux-kernel - Re: [PATCH 2.6.21.3] kbuild: fix build for cygwin

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Message-ID: <20070828193416.GB32202@uranus.ravnborg.org>
Date:	Tue, 28 Aug 2007 21:34:16 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Tom <fivemiletom@...il.com>
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

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".

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
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