Reordering of Libs

[Christopher Hulbert]

On Thu, Jan 22, 2009 at 11:24 AM, Daniel Macks <dmacks at netspace.org> wrote:
> On Thu, Jan 22, 2009 at 11:13:47AM -0500, Christopher Hulbert wrote:
>> On Thu, Jan 22, 2009 at 11:03 AM, Daniel Macks <dmacks at netspace.org> wrote:
>> > On Thu, Jan 22, 2009 at 10:09:57AM -0500, Christopher Hulbert wrote:
>> >> I searched the archive and found a few messages by 'bora.sahin at
>> >> ttnet.net.tr' on this topic, but never a response. I have a .pc file
>> >> that has a library requiring linking in the fortran compiler's
>> >> libraries. These are added with appropriate '-Bstatic' and -Bdynamic'
>> >> flags to link in static versions of the compiler libraries. Running
>> >> pkg-config --libs obviously reorders that line and messes that up. Is
>> >> there an intentional reason for this, or just an implementation
>> >> artifact?
>> >
>> > Could you give us a sample .pc and what you expect vs what happens?
>>
>> The .pc file is below. When I run pkg-config --libs, the -Bstatic and
>> -Bdynamic flags get moved up front presumably treated as other libs.
>> What I would like, is the -Bstatic to stay ordered with the libs (just
>> like the Libs line).
>>
>> [chulbert at fourier pkgconfig]$ PKG_CONFIG_PATH=. pkg-config --libs scats
>> -Bstatic -Bdynamic
>> -L/home/chulbert/isl-scrd/x86_64-unknown-linux-gnu/lib64
>> -L/opt/matio/linux86-64/1.5.0/pgi-8.0/lib
>> -L/opt/hdf5/linux86-64/1.8.2/pgi-8.0/lib
>> -L/opt/pgi/linux86-64/8.0-3/libso -L/opt/pgi/linux86-64/8.0-3/lib
>> -L/usr/lib/gcc/x86_64-redhat-linux/4.1.2 -lscats -lseke -lvsip
>> -lscatsio -lmatio -lhdf5 -lz -lpgf90 -lpgf90_rpm1 -lpgf902 -lpgf90rtl
>> -lpgftnrtl -lnspgc -lpgc -lrt -lpthread -lm
>>
> scats.pc excerpt:
>> prefix=/home/chulbert/isl-scrd/x86_64-unknown-linux-gnu
>> libdir=${exec_prefix}/lib64
>>
>> Libs: -L${libdir} -lscats -lseke
>> -L/home/chulbert/isl-scrd/x86_64-unknown-linux-gnu/lib64 -lvsip
>> -lscatsio -L/opt/matio/linux86-64/1.5.0/pgi-8.0/lib
>> -L/opt/hdf5/linux86-64/1.8.2/pgi-8.0/lib -lmatio -lhdf5 -lz
>> -L/usr/lib64 -lz  -L/opt/pgi/linux86-64/8.0-3/libso
>> -L/opt/pgi/linux86-64/8.0-3/lib -L/usr/lib64
>> -L/usr/lib/gcc/x86_64-redhat-linux/4.1.2 -Bstatic -lpgf90 -lpgf90_rpm1
>> -lpgf902 -lpgf90rtl -lpgftnrtl -lnspgc -lpgc -Bdynamic -lrt -lpthread
>> -lm -Bstatic -Bdynamic
>
> You can use -Wl, to tie multiple linker flags together as a single
> word with no whitespace. This single chunk will not get broken by
> pkg-config:
>
>  -Wl,-Bdynamic,-lrt,-lpthread,-lm,-Bstatic,-Bdynamic
>
> because the whole thing is a single word. The location of that word in
> the "pkg-config --libs" output relative to other flags might vary (I
> don't know what pkg-config's algorithm is for ordering!), but the -B
> wrappers around those -l flags will not get lost.

It does indeed move that chunk to the beginning (see below), which is
bad as some of the libs depend on the libraries in that chunk. I would
have to join the whole line into a -Wl and I'm not sure that's a good
solution. Besides, I would have to do some trickery to join together
different variables, replace spaces with commas, etc.

[chulbert at fourier pkgconfig]$ PKG_CONFIG_PATH=. pkg-config --libs scats
-Wl,-L/opt/pgi/linux86-64/8.0-3/libso,-L/opt/pgi/linux86-64/8.0-3/lib,-L/usr/lib64,-L/usr/lib/gcc/x86_64-redhat-linux/4.1.2,-Bstatic,-lpgf90,-lpgf90_rpm1,-lpgf902,-lpgf90rtl,-lpgftnrtl,-lnspgc,-lpgc,-Bdynamic,-lrt,-lpthread,-lm,-Bstatic,-Bdynamic
-L/home/chulbert/isl-scrd/x86_64-unknown-linux-gnu/lib64
-L/opt/matio/linux86-64/1.5.0/pgi-8.0/lib
-L/opt/hdf5/linux86-64/1.8.2/pgi-8.0/lib -lscats -lseke -lvsip
-lscatsio -lmatio -lhdf5 -lz


Chris

>
> dan
>
> --
> Daniel Macks
> dmacks at netspace.org
> http://www.netspace.org/~dmacks
>
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