[CMake] Linker and archiver options

[Michael Ellery]

This seems like something that would be best-suited for a toolchain file:

https://cmake.org/cmake/help/latest/manual/cmake-toolchains.7.html

Have you given that a try? Also, I wonder if STATIC_LIBRARY_FLAGS is a custom setting, because I don’t think that one is a standard cmake variable.

-Mike

> On Aug 14, 2018, at 9:30 AM, Irina Chernushina via CMake <cmake at cmake.org> wrote:
> 
> Hi,
> 
> What is the correct way of setting archiver (and flags) and linker
> (and flags) outside the CMakeLists.txt?
> 
> 1) I am trying to use the following pattern:
> 
> cmake -DCMAKE_AR="<path-to-ar>" -DCMAKE_CXX_LINK_EXECUTABLE="<linker
> path> <FLAGS> <CMAKE_CXX_LINK_FLAGS> <LINK_FLAGS> <OBJECTS> -o
> <TARGET> <LINK_LIBRARIES>" -DSTATIC_LIBRARY_FLAGS="<flags>"
> -DCMAKE_SHARED_LINKER_FLAGS="<flags>"
> -DCMAKE_EXE_LINKER_FLAGS="<flags>"
> 
> Is that in general correct options to pass that information?
> Judging by documentation, they are.
> 
> 2) However, I am getting the following warning:
> CMake Warning:
>  Manually-specified variables were not used by the project:
> 
>    STATIC_LIBRARY_FLAGS
> (Also, in CMakeCache.txt this variable is UNINITIALIZED)
> 
> If I am trying to use CMAKE_STATIC_LINKER_FLAGS, I get in the cache:
> 
> //Path to a program.
> CMAKE_AR:FILEPATH=/usr/bin/ar
> ...
> //Flags used by the linker during the creation of static libraries.
> CMAKE_STATIC_LINKER_FLAGS:STRING=rcsD
> 
> But the link command looks like:
> 
> /usr/bin/ar qc libXXX.a rcsD file1.o .. filen.o
> /usr/bin/ranlib libz.a
> 
> and I get the error:
> /usr/bin/ar: rcsD: No such file or directory
> 
> Because the order of ar arguments is wrong, flags should come before "qc".
> 
> Thank you in advance
> Irina
> 
> 
> Irina Chernushina | Software Developer | ichern at google.com |
> 
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