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From: Felix Krause <fordprefect86@googlemail.com>
Newsgroups: comp.lang.ada
Subject: GprBuild and linker options
Date: Mon, 18 Jul 2011 05:39:31 -0700 (PDT)
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Date: 2011-07-18T05:39:31-07:00
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I need GprBuild to use a custom linker option (in this case, for linking ag=
ainst an OSX framework). So I include this in my project file:

package Linker is
   for Linker_Options use ("-framework OpenCL", "-v");
end Linker;

When I try to build this project, this is the output I get at linking phase=
, which fails:

/usr/local/gnat/bin/gcc [...] -framework OpenCL -v [...]
[...]
COLLECT_GCC_OPTIONS=3D[...] '-framework OpenCL' '-v' [...]
 /usr/local/gnat/libexec/gcc/x86_64-apple-darwin10.2.0/4.5.3/collect2 [...]

After that, I get a list of undefined symbols. This is due to "-framework O=
penCL" not being given to the collect2 call. I have no idea what COMPILE_GC=
C_OPTIONS does, but I noticed my switch being listed there. Now when I copy=
paste the above call to /usr/local/gnat/bin/gcc into my shell and execute i=
t there, my switch isn't listed in COLLECT_GCC_OPTIONS anymore, but instead=
 is given to the collect2 call, and everything links correctly.

Now of course, I want the build to work directly without having to copy com=
mands to the shell. One thing I tried is splitting the switch into two stri=
ngs:

for Linker_Options use ("-framework", "OpenCL", "-v");

The linking phase now executes the following:

/usr/local/gnat/bin/gcc [...] -framework /users/felix/projects/libs/opencla=
da//OpenCL -v [...]

This obviously results in an error because this framework can't be found. I=
 searched in the GprBuild user's guide for some hint on what causes this be=
havior, but I didn't find anything. Can anyone tell me how to either make t=
he GprBuild execution with "-framework OpenCL" work like when I execute it =
in the shell, or prevent GprBuild from prepending the working path to "Open=
CL" when passing two strings to Linker_Options?

Thanks.
Felix