[CMake] option, configure_file and ON/OFF

2010-11-23 Thread Anton Deguet 
Hello,

I am trying to use a UI option to set a value used in configure_file and 
ideally obtain a file that doesn't use ON/OFF.   Here is a CMake sample:
  option (MYLIB_HAS_WHATEVER "Use whatever library" OFF)

In my config.h.in I have:
  #define ON 1
  #define OFF 0
  #define MYLIB_HAS_WHATEVER ${MYLIB_HAS_WHATEVER}

Then in my code I can use:
  #if MYLIB_HAS_WHATEVER
  
  #endif

It worked so far but there is an issue if we end up using other libraries which 
also define ON and/or OFF.  There seems to be no way to tell CMake to use 1/0 
instead of ON/OFF during the configure_file.  My solution has been to modify my 
CMake to do the following:
  option (MYLIB_HAS_WHATEVER "Use whatever library" OFF)
  if (MYLIB_HAS_WHATEVER)
set(MYLIB_CONFIG_HAS_WHATEVER 1)

  else (MYLIB_HAS_WHATEVER)
set(MYLIB_CONFIG_HAS_WHATEVER 0)

  endif (MYLIB_HAS_WHATEVER)

and in the config.h.in do:
  #define MYLIB_HAS_WHATEVER ${MYLIB_CONFIG_HAS_WHATEVER}

Is there a better way?

Anton

---
Anton Deguet, Research Engineer, ERC-CISST/LCSR, Johns Hopkins University
e-mail: anton.deg...@jhu.edu, iChat: anton.deg...@mac.com
phone: 410-790-0456
JHU, LCSR, Hackerman Hall 137b, 3400 North Charles Street, Baltimore, MD 21218, 
USA




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Re: [CMake] option, configure_file and ON/OFF

2010-11-23 Thread Michael Hertling 
On 11/23/2010 10:30 PM, Anton Deguet wrote:
> Hello,
> 
> I am trying to use a UI option to set a value used in configure_file and 
> ideally obtain a file that doesn't use ON/OFF.   Here is a CMake sample:
>   option (MYLIB_HAS_WHATEVER "Use whatever library" OFF)
> 
> In my config.h.in I have:
>   #define ON 1
>   #define OFF 0
>   #define MYLIB_HAS_WHATEVER ${MYLIB_HAS_WHATEVER}
> 
> Then in my code I can use:
>   #if MYLIB_HAS_WHATEVER
>   
>   #endif
> 
> It worked so far but there is an issue if we end up using other libraries 
> which also define ON and/or OFF.  There seems to be no way to tell CMake to 
> use 1/0 instead of ON/OFF during the configure_file.  My solution has been to 
> modify my CMake to do the following:
>   option (MYLIB_HAS_WHATEVER "Use whatever library" OFF)
>   if (MYLIB_HAS_WHATEVER)
> set(MYLIB_CONFIG_HAS_WHATEVER 1)
> 
>   else (MYLIB_HAS_WHATEVER)
> set(MYLIB_CONFIG_HAS_WHATEVER 0)
> 
>   endif (MYLIB_HAS_WHATEVER)
> 
> and in the config.h.in do:
>   #define MYLIB_HAS_WHATEVER ${MYLIB_CONFIG_HAS_WHATEVER}
> 
> Is there a better way?

In your config.h.in, simply write:

#cmakedefine01 MYLIB_HAS_WHATEVER

With CONFIGURE_FILE(), this expands to

#define MYLIB_HAS_WHATEVER 0

or

#define MYLIB_HAS_WHATEVER 1

depending on the value of MYLIB_HAS_WHATEVER.

Regards,

Michael
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