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Date: Sun, 06 Oct 2013 20:30:58 +0300
From: Andris Pavenis <andris DOT pavenis AT iki DOT fi>
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To: djgpp AT delorie DOT com
CC: RoBoard Lab <robotics AT dmp DOT com DOT tw>
Subject: Re: Cygwin-to-DJGPP cross compiler
References: <l2g4gv$11km$1 AT adenine DOT netfront DOT net>
In-Reply-To: <l2g4gv$11km$1@adenine.netfront.net>
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Reply-To: djgpp AT delorie DOT com

On 10/02/2013 06:39 AM, RoBoard Lab wrote:
> We successfully built DJGPP cross compiler in Cygwin last night using Andris Pavenis's SRPM
> packages. We use it to compile several sample programs (such as a hello world program and a
> 100-line I/O program hooking the 08h interrupt) and it seems that no problem occurs (but more tests
> should be done).
>
> I briefly mention our process in the following:
>
> 1. djcross-binutils-2.22-1ap.src.rpm
>
> This is a package with less problems. We just added _smp_mflags to .rpmmacros and removed
> BuildRequires from the spec file. Then the build progress basically succeeded under Cygwin.
>
> 2. djcrx-2.04pre_20130306-15ap.src.rpm
>
> This package needs DJGPP cross compiler to build, but we has no such compiler under Cygwin:( And if
> we want to build Cygwin-to-DJGPP cross compiler, we must build this package first... (like a
> contradiction)

See also old package

ftp://ftp.delorie.com/pub/djgpp/rpms/djcrx-2.04pre-5.src.rpm

That can be used for bootstrapping as it relies on prepackages djcrx204.zip. It is however 
recommended to replace djcrx204.zip with newer version built from current CVS sources.


> On the other hand, the makefile of DJGPP source in this package uses the environment variable
> "COMSPEC" to determine whether the cross compiling should run. And in my Cygwin (running on WinXP),
> COMSPEC is always defined, and hence the makefile don't run cross compiling correctly.
>
> To solve the above problems, we modify that makefile to force cross compiling and remove the
> compilation of all DOS binaries. The DOS binaries (djcrx204.zip) are downloaded from internet
> instead and added into this package. We then modify the spec file correspondingly to build this
> package.
>
> 3. djcross-gcc-4.8.1-1ap.src.rpm
>
> Because we need only c,c++ compilers, we modify the spec file to remove the compilation of f95,
> objc/objc++, ada.
>
> The original spec file uses the following line to make gcc binaries:
>
> make %{_smp_mflags} PATH=$RPM_BUILD_DIR/%{name}-%{version}/tmpinst/bin:$PATH || exit 1
>
> The $PATH variable has problems in Cygwin due to some path names with spaces (such as "/Program
> Files"). So we change $PATH to '/usr/local/bin:/usr/bin' in our spec file.

You can try updated SRPM version

ftp://ftp.delorie.com/pub/djgpp/rpms/djcross-gcc-4.8.1/djcross-gcc-4.8.1-3ap.src.rpm

I added "" around path so hopefully directory names with spaces should be OK.
I have not however tried to build for Cygwin

>
> The original spec file has two bugs as follows:
>
>      sh unpack-gcc.sh --no-djgpp-sources gcc-%{gcc_source_name}.tar.bz2 || exit 1
>
> '--no-djgpp-sources' should be changed to '--no-djgpp-source'

That was typo. Fixed in my local GIT repo and SRPM mentioned above

>
> and
>
>      %{_libdir}/gcc/%{target}/%{gcc_version}/finclude
>
> 'finclude' should be changed to 'include'

It should not. This line was simply misplaced and is now moved to Fortran cross-compiler section

>
> With the above modification, the binaries of gcc cross compilers can then be built successfully.
> But the RPM building progress fails due to the lack of some paths/files specified in the original
> spec file:
>
>       %{_libdir}/gcc/%{target}/%{gcc_version}/libcaf_single.*
>       %{_libdir}/gcc/%{target}/%{gcc_version}/plugin/gtype.state
>       %{_libdir}/gcc/%{target}/%{gcc_version}/plugin/include/*
>       %{_libexecdir}/gcc/%{target}/%{gcc_version}/plugin/gengtype
>       %doc COPYING* README readme.DJGPP
>
> This is possibly because we skip the compilation of gcc fortran. And we remove the above lines and
> rebuild, and then every step is passed but rpmbuild still reports errors after the last step as
> follows:

Added define to SPEC file to enable/disable also Fortran, ObjectiveC and ObjectiveC++ support.

Andris