[CMake] Question about IF and STRINGS

[Steven Truppe]

The problem is the line:

if(${_var} MATCHES "^WITH_LIB_([AZaz]+)$")
cmake_print_variables(CMAKE_MATCH_0)

doesn't print me any output ...


On 31.05.19 18:53, Steven Truppe wrote:
>
> Hi everyone,
>
> i try to create a build system where you can decide which libraries
> you want to use with variables like "WITH_LIB_GLFW" for example. every
> lib variable has other variables like WITH_LIB_GLFW_INC_PATH,
>
> WITH_LIB_GLFW_LIB_PATH, etc. so i can decide with cmake what libraries
> i'm going to use for the final executable.
>
> Now my problem is that i'm relative new to cmake and i'm learning
> c++11 in the meantime and are coding on a project so i don't have to
> much time for cmake (but it's a realy important part).
>
> Here is the code:
>
> cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
> include(CMakePrintHelpers)
>
> set(WITH_LIB_GLAD "Support the GLAD library" 1)
> set(WITH_LIB_GLFW "Support for the GLFW library" 1)
>
>   macro(bsAddLibrary lib)
> 	# get all WITH_LIB varables
>
> 	get_cmake_property(_variables VARIABLES)
> 	foreach(_var ${_variables})
> 		#	cmake_print_variables(${_var})
> 		if(${_var} MATCHES "^WITH_LIB_[AZaz]+$" _lib)
> 			cmake_print_variables(${_lib})
> 		endif()
> 	endforeach()
> endmacro()
>
>
> bsAddLibrary(WITH_LIB_GLAD) # Adds WITH_LIB_GLAD_INC_PATH and the other variables to a list for the main application that holds all inc path, compiler flags etc.
>
>   ERROR:
> ======
>
> -- The C compiler identification is GNU 6.3.0
> -- The CXX compiler identification is GNU 6.3.0
> -- 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
> CMake Error at CMakeLists.txt:15 (if):
>    if given arguments:
>
>      "CMAKE_AR" "MATCHES" "^WITH_LIB_[AZaz]+\$" "_lib"
>
>    Unknown arguments specified
> Call Stack (most recent call first):
>    CMakeLists.txt:22 (bsAddLibrary)
>
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