[CMake] CheckTypeSize and non-standard headers

[Michael Jackson]

INCLUDE(CheckCXXSourceCompiles)
CHECK_CXX_SOURCE_COMPILES(
     "#include \"wchar.h\"
     static void testcb(wint_t w) { }
     int main() {
        wint_t w = 0;
        testcb(w);
        return 0;
     }"
     HAVE_WINT_T)
message(STATUS "HAVE_WINT_T: ${HAVE_WINT_T}")

If you start with runetype.h and start following all the headers out  
and keeping track of all the symbols being #defined (plus some  
googling) we can figure out that you need to include "wchar.h" as an  
include file in your code in order to get "wint_t" defined and usable.  
The above is the cmake code to check that case.

The above code worked on OS X 10.5.6 Intel using the Xcode 3.1.2  
tooling.

Hope that helps.
---
Mike Jackson                 www.bluequartz.net



On Feb 16, 2009, at 10:23 PM, Aaron Turner wrote:

> On Mon, Feb 16, 2009 at 5:53 PM, Michael Jackson
> <mike.jackson at bluequartz.net> wrote:
>> project(Test)
>> cmake_minimum_required(VERSION 2.7)
>>
>> INCLUDE(${CMAKE_ROOT}/Modules/CheckTypeSize.cmake)
>>
>> set(CMAKE_REQUIRED_DEFINITIONS_SAVE ${CMAKE_REQUIRED_DEFINITIONS})
>> set(CMAKE_REQUIRED_DEFINITIONS
>> ${CMAKE_REQUIRED_DEFINITIONS};-D__need_wint_t=1)
>>
>> CHECK_TYPE_SIZE(wint_t WINT_T)
>> message(STATUS "Size of wint_t: ${WINT_T}")
>> message(STATUS "HAVE_WINT_T: ${HAVE_WINT_T}")
>>
>> set(CMAKE_REQUIRED_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS_SAVE})
>>
>> Although I am not sure under what circumstances you are supposed to  
>> define
>> __need_wint_t? Or if there is some other encompassing macro to  
>> define.
>> Otherwise the above will find the size in bytes of wint_t.
>
> Not sure I follow what you're trying to accomplish with the above.
> Is this cmake 2.7 specific or some trick with the __need_wint_t (which
> isn't used in runetype.h)?
>
> For now, i'm just hacking around the issue with:
>
> check_include_file("runetype.h"     HAVE_RUNETYPE_H)
> IF(APPLE AND HAVE_RUNETYPE_H)
>    # OS X has wint_t, but check_type_size won't find it
>    SET(HAVE_WINT_T 1)
> ELSE(APPLE AND HAVE_RUNETYPE_H)
>    check_type_size("wint_t"            HAVE_WINT_T)
> ENDIF(APPLE AND HAVE_RUNTYPE_H)
>
> Long term, I'm going to write my own version of check_symbol_exists
> which uses a different test which is define/typedef agnostic.
>
> -- 
> Aaron Turner
> http://synfin.net/
> http://tcpreplay.synfin.net/ - Pcap editing and replay tools for  
> Unix & Windows
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