[CMake] Cmake: VS2013: General -> Whole Program Optimization (/LTCG)

[Sachin Gaikwad]

Hi all,

I am using:
 - cmake-3.0.2
 - Visual Studio 2013 (Update 4)

I get this log message in build logs when I build any target in my Visual
Studio solution:

"MSIL .netmodule or module compiled with /GL found; restarting link with
/LTCG; add /LTCG to the link command line to improve linker performance"

I read online on this and found this Microsoft link (
https://msdn.microsoft.com/en-us/library/xbf3tbeh.aspx) which suggests that
I should set "Whole Program Optimization" under "General" properties to
"Use Link Time Code Generation" (/LTCG).

I am not able to figure out which cmake variables I should set this in? I
tried setting this flag in following variables, but it did not work.

CMAKE_EXE_LINKER_FLAGS
CMAKE_MODULE_LINKER_FLAGS
CMAKE_SHARED_LINKER_FLAGS

Thanks,
Sachin
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