[CMake] General cross platform stating place

[Aaron Gray]

Hi,

Am new to this mailing list. And have looked at CMake as a tool in a number
of other projects including LLVM, but still consider myself a CMake newbie.

I am looking at using CMake for a group of meta language based projects I
am developing.

Basically I need to be able to develop for all three major C++ compilers,
MSVC, GCC, and Clang, on all major platforms, Windows, Linux and on the Mac.

What I am wondering is if there is a good starting point / set of scripts
for CMake that will allow me to build :-

   a) On Windows for MSVC, Clang and GCC
   b) For Linux with Clang/LLVm tool chain and GCC

And at some point
   c) XCode on the Mac

Support for using Googles gtest.

Basically I don't want to get too bogged down with CMake scripts if it is
possible to avoid getting bogged down with them as much as it is possible.

Heres where I am now, I have pinched gtests script and have Windows MSVC,
MSYS GCC and Linux GCC and Clang.

I have used gtest's script as a staring place :-


https://github.com/google/googletest/blob/master/googletest/cmake/internal_utils.cmake

And the following script :-
~~~
cmake_minimum_required(VERSION 2.6)
set(CMAKE_AR /usr/bin/ar CACHE FILEPATH "Archiver")

project(gtest-test CXX C)

find_package (Threads)

# Define helper functions and macros.
include(cmake/internal_utils.cmake)
config_compiler_and_linker()  # Defined in internal_utils.cmake.

#message("prefix: ${CMAKE_FIND_LIBRARY_PREFIXES}")
#message("suffix: ${CMAKE_FIND_LIBRARY_SUFFIXES}")

find_package(BISON)
find_package(FLEX)


# Locate GTest
find_package(GTest REQUIRED)
include_directories(${GTEST_INCLUDE_DIRS})

# Link runTests with what we want to test and the GTest and pthread library
add_executable(runTests tests.cpp)
target_link_libraries(runTests ${GTEST_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})
~~~

It runs fine on Windows with MSVC, seems to be failing on MSYS :-
~~~

$ cmake -G "MSYS Makefiles" .
CMake Error: CMAKE_AR was not found, please set to archive program.
CMake Error: CMAKE_AR was not found, please set to archive program.
CMake Error: CMAKE_AR was not found, please set to archive program.
CMake Error at C:/Program Files
(x86)/CMake/share/cmake-3.3/Modules/FindPackageHandleStandardArgs.cmake:148
(message):
Could NOT find GTest (missing: GTEST_LIBRARY GTEST_INCLUDE_DIR
GTEST_MAIN_LIBRARY)

Call Stack (most recent call first):
C:/Program Files
(x86)/CMake/share/cmake-3.3/Modules/FindPackageHandleStandardArgs.cmake:388
(_FPHSA_FAILURE_MESSAGE)
C:/Program Files (x86)/CMake/share/cmake-3.3/Modules/FindGTest.cmake:204
(FIND_PACKAGE_HANDLE_STANDARD_ARGS)

CMakeLists.txt:20 (find_package)

-- Configuring incomplete, errors occurred!
See also "C:/Users/Aaron/GitHub/GTest/CMakeFiles/CMakeOutput.log".
See also "C:/Users/Aaron/GitHub/GTest/CMakeFiles/CMakeError.log".

~~~

CMakeOutput.txt and CMakeError.txt Files attached.

So if theres either a better starting point or better/proper way of doing
this then please put me on the right path.

Aaron
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