I use the "Unix Makefiles" generator (on macOS), with clang and clang++ as compilers (XCode version 9).
On Wed, 8 Nov 2017 at 03:47 Craig Scott <[email protected]> wrote: > > On Wed, Nov 8, 2017 at 7:29 AM, Robin Verschueren < > [email protected]> wrote: > >> Hi there, >> >> I'm building some C code into a library. The library needs to link to a >> C++ static library (IMPORTED target). I'm puzzled by the following: >> >> - with BUILD_SHARED_LIBS=OFF (default), everything works as expected >> and CMake sees the C library as a "C++ library" (i.e. it uses the C++ >> compiler/linker to link the two libraries together into a static library). >> - with BUILD_SHARED_LIBS=ON however, CMake tries to link the C >> library to the C++ library with cc (clang in my case), and I get linker >> errors. >> >> My questions: >> >> *What mechanism does CMake use to determine the linker language, and why >> is it different in these two cases?* Is it because I want to link a >> shared library against a static library as opposed to two static ones? Or >> is BUILD_SHARED_LIBS a red herring? Does CMake have a notion of what linker >> language to use for IMPORTED targets? >> >> > Can you confirm which CMake generator type you are using? If it is the > Xcode generator, do you get the same behaviour building at the command line > as you do from within the IDE? I only ask because your symptoms sound > eerily familiar to a problem I've seen before where linking used a > different launcher from the command line compared to the IDE (see the Xcode > section of this article > <https://crascit.com/2016/04/09/using-ccache-with-cmake/>). > > > > -- > Craig Scott > Melbourne, Australia > https://crascit.com >
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