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

[Dmitry Polyanitsa]

Hi Brad, Robert,

Here's the algorithm in short: we split the string by the semicolon and then merge it again, processing each entry as follows. If it contains a slash (forward or backward) or ends with a .so or .a, we consider it to be a fully specified path and don’t add the "-l" prefix. Otherwise, we add it. We also do some additional processing to handle parentheses (we use them to denote start/end of the groups), but it should be orthogonal to the addition of the prefix.

Speaking of which, you could try using parentheses instead of -Wl,--start-group/-Wl,--end-group to define a linker group in the CMakeLists.txt file. The following worked for me (note the escaping):
target_link_libraries(twolib-second twolib-first \( c m gcc log \))

This won't be compatible with other generators I presume, but at least it should serve as a workaround while we fix the prefix addition to the -Wl flags in Nsight Tegra.

-Dmitry

-----Original Message-----
From: Brad King [mailto:brad.king at kitware.com] 
Sent: Monday, January 12, 2015 9:06 PM
To: Robert Goulet
Cc: Justin Borodinsky; cmake-developers at cmake.org; Dmitry Polyanitsa
Subject: Re: [cmake-developers] target_link_libraries and --start-group/--end-group ?

On 1/12/2015 12:39 PM, Robert Goulet wrote:
> the generated line in the .vcxproj file looks correct :
> 
> <AdditionalDependencies>android;dl;EGL;GLESv3;OpenSLES;-Wl,--start-gro
> up;libfoo.a;libbar.a;-Wl,--end-group</AdditionalDependencies>
> 
> So now I am guessing the problem is in the glue that adds support of Android to the VS IDE?
> Where is the code that translate a link library into the command line, such as "libfoo.a" to "-lfoo"?

That is in the Nsight Tegra implementation AFAIK.  Here is a related change already in 3.1.0:

 VS: Fix Tegra-Android platform linking of libraries by name
 http://cmake.org/gitweb?p=cmake.git;a=commitdiff;h=178f56a5

Dmitry, how does Nsight Tegra transform these flags?

Thanks,
-Brad

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