tip-of-tree does not compile (cmake configuration failure)

[aslushnikov]

Hi!

I'm trying to compile tip-of-tree libwpe on Ubuntu. I do the following steps:

1. git clone https://github.com/WebPlatformForEmbedded/libwpe
2. cd libwpe
3. cmake .

Here is what I get:

aslushnikov:~/prog/libwpe(master)$ cmake .
-- The C compiler identification is GNU 7.4.0
-- The CXX compiler identification is GNU 7.4.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Performing Test CXX_HAS_FLAG_-fno-exceptions
-- Performing Test CXX_HAS_FLAG_-fno-exceptions - Success
-- Performing Test CXX_HAS_FLAG_-fno-rtti
-- Performing Test CXX_HAS_FLAG_-fno-rtti - Success
-- Performing Test CXX_HAS_FLAG_-Wall
-- Performing Test CXX_HAS_FLAG_-Wall - Success
-- Performing Test CC_HAS_FLAG_-Wall
-- Performing Test CC_HAS_FLAG_-Wall - Success
-- Found PkgConfig: /usr/bin/pkg-config (found version "0.29.1")
-- Checking for module 'egl'
--   Found egl, version 19.2.1
CMake Error at cmake/FindEGL.cmake:53 (target_link_libraries):
  Cannot specify link libraries for target "GL::egl" which is not built by
  this project.
Call Stack (most recent call first):
  CMakeLists.txt:51 (find_package)


-- Configuring incomplete, errors occurred!
See also "/home/aslushnikov/prog/libwpe/CMakeFiles/CMakeOutput.log".

Note: this worked fine on version 1.4.0; it looks like this commit changed the EGL discovery somehow and CMake is unhappy.

I tried compiling under clean ubuntu docker image with the same results.

Is this a bug in cmake configuration, or do I miss something?

Thanks!

[zdobersek]

Reproduced the same problem.

d395e44 should fix this. AFAIU the error is a quirk of older CMake versions.