Re[2]: [Mingw-users] Checking w32api version

[berk <be...@nm...>]

Use The Source, Mattia!

Replying to your mail dated Saturday, February 17, 2001, 2:23:59 AM,
about "[Mingw-users] Checking w32api version":

#if FOO_VERSION >>= 0.4

MB> gcc complains:
MB> foo.c:3: Floating point numbers not allowed in #if expressions

found that in mingw ansidecl.h:

/* Using MACRO(x,y) in cpp #if conditionals does not work with some
   older preprocessors.  Thus we can't define something like this:

#define HAVE_GCC_VERSION(MAJOR, MINOR) \
  (__GNUC__ > (MAJOR) || (__GNUC__ == (MAJOR) && __GNUC_MINOR__ >= (MINOR)))

and then test "#if HAVE_GCC_VERSION(2,7)".

So instead we use the macro below and test it against specific values.  */

/* This macro simplifies testing whether we are using gcc, and if it
   is of a particular minimum version. (Both major & minor numbers are
   significant.)  This macro will evaluate to 0 if we are not using
   gcc at all.  */
#ifndef GCC_VERSION
#define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
#endif /* GCC_VERSION */

so, obviously, you don't have to deal with float numbers but to a
several orders of magnitude larger integer numbers.

#ifndef FOO_VERSION
#define FOO_VERSION (__FOO_MAJOR * 1000 + __FOO_MINOR)
#endif

keep in touch. berk.
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