[CMake] MSYS EXEC_PROGRAM() or EXECUTE_PROCESS() fails

[Brad King]

Brad King wrote:
> Peter Visser wrote:
>> I just "discovered" cmake, I find cmake easy to setup and it works
>> fantastic.
>> However, a small problem occurs. I'm using: cmake 2.4-patch3 under
>> MSYS-1.0.10.
>>  
>> The problem occurs when using EXEC_PROGRAM() or EXECUTE_PROCESS().
>> Instead of "sh.exe" from MSYS being used to execute the program
>> "cmd.exe" from windows is being used.
>> This results in an error if the binary doesn't run under windows
>> natively e.g. wx-config. ( e.g. FIND_PACKAGE(wxWidgets) will not work)
>> It can be solved by
>> Changing:
>>  EXEC_PROGRAM(wx-config
>>         ARGS "--cxxflags"
>>         OUTPUT_VARIABLE wxWidgets_CXX_FLAGS
>>         RETURN_VALUE RET)
>> Into:
>>  EXEC_PROGRAM(sh
>>         ARGS "wx-config --cxxflags"
>>         OUTPUT_VARIABLE wxWidgets_CXX_FLAGS
>>         RETURN_VALUE RET)
>>  
>> Most likely I'm doing something wrong, is there a switch/macro or
>> calling cmake with an argument to solve this?
> 
> CMake is a windows program that happens to know how to generate MSYS
> makefiles.  It does not try to reproduce the native build behavior for
> EXEC* commands during processing of CMakeLists.txt code.  Windows
> programs do not know how to interpret #! lines in scripts they execute.
>  You'll have to  invoke it using the second form.  It should work
> everywhere anyway.

Oops, I meant "we'll have to invoke it using the second form".  We'll
fix the find script.

Thanks,
-Brad