On Fri, Jun 27, 2025 at 01:37:13PM +0100, Richard W.M. Jones wrote:
> On Tue, Jun 24, 2025 at 12:19:47PM -0500, Chris Adams wrote:
> > Once upon a time, Richard W.M. Jones <[email protected]> said:
> > > To make the discussion concrete, could you grab a list of the actual
> > > libraries that we're talking about here? I'm interested in how hard
> > > it would be to adapt them to cross compilation as Dan mentioned upthread.
> >
> > Just looking at a running copy of the Steam client, I see libs loaded
> > from a whole lot of packages. I expect that some are loaded by others,
> > like I don't expect steam is actually using lm_sensors-libs itself.
> >
> > NetworkManager-libnm
> > atk
> > bzip2-libs
>
> Thanks! It's a lot of libraries. I picked bzip2 at random as it's
> relatively simple and modified it so it cross-compiled to a 32 bit
> library. The diff to the spec is attached.
And I should say this probably only works because I have glibc.i686
installed. The packages would need to be modified & rebuilt in
dependency order starting with glibc.
Rich.
> Obviously this could either be done as a new, separate package, or as
> a subpackage of the existing bzip2 package. (For mingw we're mixing
> both approaches.)
>
> RPM complains about:
>
> Macro expanded in comment on line 10: %{version}/%{name}-%{version}.tar.gz
>
> Binaries arch (1) not matching the package arch (2).
> Binaries arch (1) not matching the package arch (2).
>
> I couldn't use 'BuildArch: i686' as I expected. Apparently only
> 'BuildArch: noarch' works. But surely this could be fixed somehow.
>
> Cross-compiling _all_ of the packages in this way is going to be a
> fair bit of work.
>
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
> Fedora Windows cross-compiler. Compile Windows programs, test, and
> build Windows installers. Over 100 libraries supported.
> http://fedoraproject.org/wiki/MinGW
> diff --git a/bzip2.spec b/bzip2.spec
> index ca1b861..7a0baab 100644
> --- a/bzip2.spec
> +++ b/bzip2.spec
> @@ -1,4 +1,5 @@
> %global library_version 1.0.8
> +%global _libdir32 %{_prefix}/lib
>
> Summary: File compression utility
> Name: bzip2
> @@ -64,28 +65,28 @@ Static libraries for applications using the bzip2
> compression format.
> %patch -P3 -p2
>
> cp -a %{SOURCE1} .
> -sed -i "s|^libdir=|libdir=%{_libdir}|" bzip2.pc
> +sed -i "s|^libdir=|libdir=%{_libdir32}|" bzip2.pc
>
> %build
>
> %make_build -f Makefile-libbz2_so CC="%{__cc}" AR="%{__ar}" RANLIB="ranlib" \
> - CFLAGS="$RPM_OPT_FLAGS -D_FILE_OFFSET_BITS=64 -fpic -fPIC" \
> + CFLAGS="$RPM_OPT_FLAGS -D_FILE_OFFSET_BITS=64 -fpic -fPIC -m32" \
> LDFLAGS="%{__global_ldflags}" \
> all
>
> rm -f *.o
> %make_build CC="%{__cc}" AR="%{__ar}" RANLIB="ranlib" \
> - CFLAGS="$RPM_OPT_FLAGS -D_FILE_OFFSET_BITS=64" \
> + CFLAGS="$RPM_OPT_FLAGS -D_FILE_OFFSET_BITS=64 -m32" \
> LDFLAGS="%{__global_ldflags}" \
> all
>
> %install
> chmod 644 bzlib.h
> -mkdir -p
> $RPM_BUILD_ROOT{%{_bindir},%{_mandir}/man1,%{_libdir}/pkgconfig,%{_includedir}}
> +mkdir -p
> $RPM_BUILD_ROOT{%{_bindir},%{_mandir}/man1,%{_libdir32}/pkgconfig,%{_includedir}}
> cp -p bzlib.h $RPM_BUILD_ROOT%{_includedir}
> -install -m 755 libbz2.so.%{library_version} $RPM_BUILD_ROOT%{_libdir}
> -install -m 644 libbz2.a $RPM_BUILD_ROOT%{_libdir}
> -install -m 644 bzip2.pc $RPM_BUILD_ROOT%{_libdir}/pkgconfig/bzip2.pc
> +install -m 755 libbz2.so.%{library_version} $RPM_BUILD_ROOT%{_libdir32}
> +install -m 644 libbz2.a $RPM_BUILD_ROOT%{_libdir32}
> +install -m 644 bzip2.pc $RPM_BUILD_ROOT%{_libdir32}/pkgconfig/bzip2.pc
> install -m 755 bzip2-shared $RPM_BUILD_ROOT%{_bindir}/bzip2
> install -m 755 bzip2recover bzgrep bzdiff bzmore $RPM_BUILD_ROOT%{_bindir}/
> cp -p bzip2.1 bzdiff.1 bzgrep.1 bzmore.1 $RPM_BUILD_ROOT%{_mandir}/man1/
> @@ -95,8 +96,8 @@ ln -s bzdiff $RPM_BUILD_ROOT%{_bindir}/bzcmp
> ln -s bzmore $RPM_BUILD_ROOT%{_bindir}/bzless
> ln -s bzgrep $RPM_BUILD_ROOT%{_bindir}/bzegrep
> ln -s bzgrep $RPM_BUILD_ROOT%{_bindir}/bzfgrep
> -ln -s libbz2.so.%{library_version} $RPM_BUILD_ROOT%{_libdir}/libbz2.so.1
> -ln -s libbz2.so.1 $RPM_BUILD_ROOT%{_libdir}/libbz2.so
> +ln -s libbz2.so.%{library_version} $RPM_BUILD_ROOT%{_libdir32}/libbz2.so.1
> +ln -s libbz2.so.1 $RPM_BUILD_ROOT%{_libdir32}/libbz2.so
> ln -s bzip2.1 $RPM_BUILD_ROOT%{_mandir}/man1/bzip2recover.1
> ln -s bzip2.1 $RPM_BUILD_ROOT%{_mandir}/man1/bunzip2.1
> ln -s bzip2.1 $RPM_BUILD_ROOT%{_mandir}/man1/bzcat.1
> @@ -115,17 +116,17 @@ ln -s bzgrep.1 $RPM_BUILD_ROOT%{_mandir}/man1/bzfgrep.1
>
> %files libs
> %license LICENSE
> -%{_libdir}/libbz2.so.1*
> +%{_libdir32}/libbz2.so.1*
>
> %files static
> %license LICENSE
> -%{_libdir}/libbz2.a
> +%{_libdir32}/libbz2.a
>
> %files devel
> %doc manual.html manual.pdf
> %{_includedir}/*
> -%{_libdir}/*.so
> -%{_libdir}/pkgconfig/bzip2.pc
> +%{_libdir32}/*.so
> +%{_libdir32}/pkgconfig/bzip2.pc
>
> %changelog
> * Thu Jan 16 2025 Fedora Release Engineering <[email protected]> -
> 1.0.8-20
> --
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--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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