Project doesn't compile with Ninja

[afiskon]

Steps to reproduce:

$ mkdir build
$ cd build
$ cmake -G Ninja ..
[...]
$ ninja
ninja: error: 'ext/gtest/src/googletest-build/libgtest.a', needed by 'cpp-lru-cache-test', missing and no known rule to make it

CMake version is 3.9.4, the environment is Arch Linux x64.

make compiles everything as expected. I believe something is wrong in ExternalProject_Add arguments. Unfortunately I can't give more details since I've never used ExternalProject before (I prefer git submodules).

[lamerman]

@afiskon I will have a look soon

[lamerman]

@afiskon what I understood so far is that for some reason with cmake -G Ninja .. it generates build.ninja with incompatible paths for static libraries.

So in the build file we have path ext/gtest/src/googletest-build/libgtest.a while in reality when ninja googletest is executed the path where static libraries are generated is ext/gtest/src/googletest-build/googlemock/gtest/libgtest.a

Moreover it somehow doesn't work if you don't execute ninja googletest before ninja.

Now it's all not clear for me, so let the task be open.