Newell, James C. wrote:
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Martin Apel
Sent: Tuesday, April 22, 2008 9:06 AM
To: [email protected]
Subject: [CMake] How to link executable with libraries containing
circulardependencies
Hi there,
I am trying to link an executable with multiple libraries, which
reference each other in a circular fashion. It seems, that I cannot
specify the same library multiple times
in TARGET_LINK_LIBRARIES, so the link line will always end up with
each
library listed exactly once. In my case, this leads to unresolved
symbols.
I know that circular dependencies are not nice, but it's a large
"inherited" project I would like to convert to use CMake.
I posted this issue before, trying to resolve it using the --start-
group
and --end-group options to the linker, but haven't gotten any
responses
yet.
To me it looks, as if CMake is not able to handle linker calls with
circular references. Any pointers?
Regards,
I solved it by using the 'add_custom_target'. The example below isn't
generic, but could be made so with a bit more work and the example
assumes the main is contained in one of the libx.a and I used the cxx
instead of c compiler.
project(myproj)
set(mylibs
lib1.a
lib2.a
lib3.a)
foreach(libs ${mylibs})
set(userlibs ${uselibs} somepath/${libs})
endforeach(libs)
add_custom_target(mymain ALL ${CMAKE_CXX_COMPILER} -g -o mymain
-Wl,--start-group ${uselibs} -Wl,--end-group ${MY_LINK_FLAGS})
Regards,
Jim
Hi Jim,
thanks for your reply. I tried this approach myself, but the problem
with it is, that you also have to define custom commands for generating
the object file containing the main function,
which should rather not be contained in a library. Otherwise one of the
libraries has to contain exactly one main function, which probably leads
to creating one additional library for each main
program in the system, which is not nice.
Regards,
Martin
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