[cmake-developers] target_link_libraries and --start-group/--end-group ?

[Robert Goulet]

I tried that but then target_link_libraries will automatically add “-l” in front of every additional flag I pass. Is there a way to pass other flags without having it changed them?

i.e.:
target_link_libraries(${PROJECT_NAME} -Wl,--start-group foo bar -Wl,--end-group)

…ends up like this in the linker command line:
-l”-Wl,--start-group” –lfoo –lbar –l”-Wl,--end-group”

So how do you preserve other flags so that it ends up like this:

-Wl,--start-group –lfoo –lbar -Wl,--end-group


From: Justin Borodinsky [mailto:justin.borodinsky at gmail.com]
Sent: Thursday, January 8, 2015 10:18 PM
To: Robert Goulet
Cc: Robert Maynard; cmake-developers at cmake.org
Subject: Re: [cmake-developers] target_link_libraries and --start-group/--end-group ?

I had a similar problem, and I found that passing the extra flags, along with the libraries, to target_link_libraries directly worked.

On Tue, Jan 6, 2015 at 3:50 PM, Robert Goulet <Robert.Goulet at autodesk.com<mailto:Robert.Goulet at autodesk.com>> wrote:
Thanks Robert,

But it doesn’t seems to work when building for NVidia NSight Android platform using Visual Studio IDE. Is there a way to add custom flags before and after the flags set by target_link_libraries? I tried CMAKE_LINK_EXE_FLAGS but it doesn’t work. Thanks!

From: Robert Maynard [mailto:robert.maynard at kitware.com<mailto:robert.maynard at kitware.com>]
Sent: Monday, January 5, 2015 4:22 PM
To: Robert Goulet
Cc: cmake-developers at cmake.org<mailto:cmake-developers at cmake.org>
Subject: Re: [cmake-developers] target_link_libraries and --start-group/--end-group ?

I believe what you want to do is bring the libraries in as imported targets and set the target property IMPORTED_LINK_INTERFACE_MULTIPLICITY ( http://www.cmake.org/cmake/help/v3.0/prop_tgt/IMPORTED_LINK_INTERFACE_MULTIPLICITY.html ).

By default the value should be 2 which means that we will list all static libraries twice, but you might need to increase the value.

I would also read the resolution of bug 14463 (http://public.kitware.com/Bug/view.php?id=14463) for a quick explanation of how the target_link_libraries order determines the static link ordering.


On Mon, Jan 5, 2015 at 2:09 PM, Robert Goulet <Robert.Goulet at autodesk.com<mailto:Robert.Goulet at autodesk.com>> wrote:
Hi,

My project needs to link with an external library which actually consist of a set of libraries. Adding these libs using target_link_libraries should be working just fine but unfortunately these libs have a bunch of circular dependencies, so it fails. In the makefile, we link with these libs using this syntax:

-Wl,--start-group …libs… -Wl,--end-group

…so that the linker is able to correctly find all symbols. What’s the proper way to deal with this using CMake? I tried to add the group flags to target_link_libraries but it does not work. Thanks!



Robert Goulet
Senior Software Developer
Games Solutions Group
Autodesk Media & Entertainment

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