Re: Libtool does not generate shared libraries when cross compiling x86/64 -> sparc64 using fujitsu compiler

[Harald Servat]

On 02/02/2016 07:02 PM, Mike Frysinger wrote:
> On 02 Feb 2016 17:51, Harald Servat wrote:
> >     we want to use libtool on a system on which we have to cross-compile
> > from intel x86/64 to sparc/64 using the Fujitsu compiler (fccpx).
> > Unfortunately, I'm unable to get libtool (version 2.4.2) to generate
> > shared libraries.
> >
> >     I have written a very small libtool + autotools example and run the
> > following but I'm always getting the output shown below the commands.
> > Note, that the same works fine in a linux/x86-64 and I don't have to add
> > --enable-shared in that case, so I guess I don't need --enable-shared
> > either in these tests.
> >
> > COMMANDS:
> >
> >     ./configure --prefix=/tmp/test CC=fccpx --host=x86_64
> >     ./configure --prefix=/tmp/test CC=fccpx --host=x86-64 --target=sparc64
> >     ./configure --prefix=/tmp/test CC=fccpx --host=x86_64
> > --target=sparc64-linux
>
> your flags are incorrect.  you want --build=x86_64-linux-gnu and
> --host=sparc64-linux-gnu.  please read this doc for more info:
> https://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/Hosts-and-Cross_002dCompilation.html
> -mike

Thank you for the pointer Mike.

  we have found that

 ./configure --prefix=/tmp/test CC=fccpx --build=x86_64-linux-gnu 
--host=sparc64-linux-gnu

  did not work. See:

...
checking whether the fccpx linker (/usr/bin/ld -m elf64_sparc) supports 
shared libraries... no
checking dynamic linker characteristics... GNU/Linux ld.so
checking how to hardcode library paths into programs... unsupported
checking for shl_load... no
checking for shl_load in -ldld... no
checking for dlopen... yes
checking whether a program can dlopen itself... cross
checking whether stripping libraries is possible... yes
checking if libtool supports shared libraries... no

  However, the system support suggested to add the flag -Xg into the 
Fujitsu compiler and we found that the following configure did work.

./configure --prefix=/tmp/test CC=fccpx --host=x86-linux CFLAGS="-Xg"

checking whether the fccpx linker (/usr/bin/ld) supports shared 
libraries... yes
checking whether -lc should be explicitly linked in... no
checking dynamic linker characteristics... fccpx: warning: 
-print-search-dirs is unrecognized option. This option is passed to the 
linker.
usage: fccpx [options] files.
GNU/Linux ld.so
checking how to hardcode library paths into programs... immediate
checking for shl_load... no
checking for shl_load in -ldld... no
checking for dlopen... yes
checking whether a program can dlopen itself... cross
checking whether stripping libraries is possible... yes
checking if libtool supports shared libraries... yes

  So that works for the small test example I generated. However, when 
passing the same flags to the application we want to build, then the 
libtool still claims it does not support shared libraries. So there are 
couple of questions then: any idea on why this larger case the addition 
of CFLAGS and --host does allow libtool to generate shared libraries? 
And, I don't have direct access to the system, but can I do something to 
improve the support on this system?

Best,


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