[CMake] cmake 2.8.12.2 fails on AIX 6.1 with "ld: target noipath not found"

[Bill Hoffman]

On Thu, May 1, 2014 at 6:35 PM, Graham Russell <grussell at cheetah.com> wrote:

> Seems like there are 2 choices for a solution:
>   1. Change CMake so it uses the IBM linker instead of the GNU linker.
>  What settings would I need to change in the cmake files to try this?
>

This is not really an option.  CMake can not choose the linker for the
compiler.  You would have to rebuild gcc with the option to use the native
linker.

>   2. Change the linker options so they will work for the GNU linker.
>
> I tried option #2 by removing "-bnoipath" from the Modules/AIX-GNU.cmake
> file.  This enabled cmake to run successfully on test files and on the
> MySQL package.
>
> Yes, that would be the way to do it.  However, we have to somehow tell the
difference between a gcc configured to use the native linker and one
configured to use the GNU linker and pick the flags accordingly.


> However, my ultimate aim being to build MySQL, the make did run into
> errors subsequently, so I would like to try option #1 also.  I am
> interested if you have an opinion as to whether option #1 or option #2
> would give me a better shot at building MySQL.
>

I think you have to deal with those errors or rebuild gcc with the native
linker, or use the native compilers.

>
> Further to your question "Would you be willing to run a nightly
> dashboard with this configuration so we can test it over time?"
> I would be willing, but need to know how to do this and what it involves.
>

It involves setting up a cronjob on your machine that runs once a day and
pulls from the cmake repository, builds cmake, and runs the tests, then
sends the results to CDash.   If we get to that point I can send pretty
simple instructions.

Thanks.

-Bill


>
> Thanks
> Graham Russell
>
> -----Original Message-----
> From: CMake [mailto:cmake-bounces at cmake.org] On Behalf Of Bill Hoffman
> Sent: Thursday, May 01, 2014 1:33 PM
> To: cmake at cmake.org
> Subject: Re: [CMake] cmake 2.8.12.2 fails on AIX 6.1 with "ld: target
> noipath not found"
>
> On 5/1/2014 4:04 PM, Graham Russell wrote:
> > Thanks for the response, Bill.
> >
> > I confirmed that the compiler install works fine:
> > pvm-vangogh-94:grussell [625] /usr/local/bin/gcc  hello.c -o hello
> pvm-vangogh-94:grussell [626] ./hello Hello World!
> >
> > I also tested it with your simple program and it also compiles OK and
> runs.
> >
> > I think the problem lies in the options that CMake uses to test the AIX
> compile environment.
> >
> > Thanks
> > Graham Russell
>
>
> OK, from the log you sent, we can see that CMake is passing some stuff to
> the linker:
>
> /usr/local/bin/gcc
> CMakeFiles/cmTryCompileExec680887608.dir/testCCompiler.c.o  -o
> cmTryCompileExec680887608 -Wl,-brtl,-bnoipath,-bexpall
> -Wl,-blibpath:/usr/lib:/lib
>
>
>
> I think the problem is that you are using the GNU linker, and CMake seems
> to be expecting the AIX linker to be used even with gcc.
>
> You can see this is the linker used:
>
> /usr/local/lib/gcc/powerpc-ibm-aix6.1.0.0/4.4.4/../../../../powerpc-ibm-aix6.1.0.0/bin/ld:
>
> Which is the GNU linker and not the AIX linker which supports and needs
> that flag.
>
>
> You should be able to change this in Modules/AIX-GNU.cmake
>
> which has this:
>    set(CMAKE_SHARED_LIBRARY_LINK_${lang}_FLAGS
> "-Wl,-brtl,-bnoipath,-bexpall")  # +s, flag for exe link to use shared lib
>
>
>
> That should get you going.  I will think about a solution that can be
> incorporated into CMake.  Would you be willing to run a nightly
> dashboard with this configuration so we can test it over time?
>
> Thanks.
>
> -Bill
>
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