Re: Macro to check header define value

[Peter Johansson]

Hi emannuel,

address@hidden wrote:
> Hi,
>
> my software uses an extern library which has its version number in it header.h 
> like following:
> #define LIB_VERSION 424242
>
> I need to check this version number (because the API was changed and this 
> introduced an incompatibility).
>
> I think about something like AC_CHECK_DEFINE_VALUE... bug nothing like that 
> seems to exist.
>
> Does someone knows how to do that?
>
>   
I would use a more low-level macro such as AC_COMPILE_IFELSE, e.g., as 
follows (not tested)

   AC_COMPILE_IFELSE(
     [AC_LANG_PROGRAM(address@hidden:@include <header.h>],
       [ #if LIB_VERSION >= 424242
         // OK
         #else
         # error version too old
         #endif
       ])
     ],
   [ACTION-IF_OK], ACTION-IF_NOT_OK])

Cheers,
Peter

--
Peter Johansson

svndigest maintainer, http://dev.thep.lu.se/svndigest
yat maintainer,       http://dev.thep.lu.se/yat