[CMake] Check_Type_Size question

[Alexander Neundorf]

> --- Ursprüngliche Nachricht --- 
> Von: "Tanner Lovelace" <clubjuggler at gmail.com> 
> An: "Cmake Mailing List" <cmake at cmake.org> 
> Betreff: [CMake] Check_Type_Size question 
> Datum: Fri, 31 Mar 2006 00:41:36 -0500 
>  
> Greetings, 
>  
> With the function check_type_size, I'm trying to, if an initial test 
> fails, 
> try it again with a different header file, but for some reason the 
second 
> test is never getting run.  What am I doing wrong with this code? 
>  
> set(CMAKE_EXTRA_INCLUDE_FILES sys/statfs.h) 
> check_type_size("struct statfs" HAVE_STRUCT_STATFS) 
> SET(CMAKE_EXTRA_INCLUDE_FILES)  #reset CMAKE_EXTRA_INCLUDE_FILES 
>  
> if(NOT HAVE_HAVE_STRUCT_STATFS) 
>   set(CMAKE_EXTRA_INCLUDE_FILES sys/mount.h) 
>   check_type_size("struct statfs" HAVE_STRUCT_STATFS) 
>   SET(CMAKE_EXTRA_INCLUDE_FILES)  #reset CMAKE_EXTRA_INCLUDE_FILES 
> endif(NOT HAVE_HAVE_STRUCT_STATFS) 
>  
> The problem is that on OS X Tiger, the file <sys/statfs.h> doesn't 
> exist, but "struct statfs" is in <sys/mount.h>.  Now I could just 
> surround "set(CMAKE_EXTRA_INCLUDE_FILES ...)" with 
> an if(APPLE) and set the correct header file for the correct 
> platform, but I'd rather do it as a fallback in case apple later 
> changes its mine and decides to put it in sys/statfs.h. 
>  
> Note, btw, that HAVE_HAVE_STRUCT_STATFS is set to 
> HAVE_HAVE_STRUCT_STATFS:INTERNAL=false 
> in CMakeCache.txt after running cmake. 
>  
> Any help would be appreciated!  Thanks in advance. 
 
I think the second test isn't executed because a variable with this name 
already exists. 
So you should give the result variables of the two tests different names 
and then use something like: 
 
IF (HAVE_STRUCT_STATFS_1 OR HAVE_STRUCT_STATFS_2) 
   SET(HAVE_STRUCT_STATFS TRUE) 
ENDIF (HAVE_STRUCT_STATFS_1 OR HAVE_STRUCT_STATFS_2) 
 
Bye 
Alex 
 
 
 
 
 

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