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From:	RoBoard Lab <robotics AT dmp DOT com DOT tw>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Cygwin-to-DJGPP cross compiler
Date:	Wed, 02 Oct 2013 11:39:32 +0800
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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)

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.

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'

and

     %{_libdir}/gcc/%{target}/%{gcc_version}/finclude

'finclude' should be changed to 'include'

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:

error: Installed (but unpackaged) file(s) found:
    /usr/bin/i586-pc-msdosdjgpp-c++.exe
    /usr/bin/i586-pc-msdosdjgpp-cpp.exe
    /usr/bin/i586-pc-msdosdjgpp-g++.exe
    /usr/bin/i586-pc-msdosdjgpp-gcov.exe
    /usr/libexec/gcc/i586-pc-msdosdjgpp/4.8.1/cc1.exe
    /usr/libexec/gcc/i586-pc-msdosdjgpp/4.8.1/cc1plus.exe
    /usr/libexec/gcc/i586-pc-msdosdjgpp/4.8.1/collect2.exe
    /usr/libexec/gcc/i586-pc-msdosdjgpp/4.8.1/lto-wrapper.exe

RPM build errors:
     File listed twice: 
/usr/lib/gcc/i586-pc-msdosdjgpp/4.8.1/include/adxintrin.h
     File listed twice: 
/usr/lib/gcc/i586-pc-msdosdjgpp/4.8.1/include/ammintrin.h
     File listed twice: 
/usr/lib/gcc/i586-pc-msdosdjgpp/4.8.1/include/avx2intrin.h
......

So we then manually copy and install the generated 
i586-pc-msdosdjgpp-xxx binaries to the Cygwin system, and with some 
tests, they seems to work normally.


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