Re: Is the version of MacOS available to CPP ?

[Ben Abbott]

On Jun 10, 2012, at 7:33 AM, Jordi Gutiérrez Hermoso wrote:

> On 09/06/2012, Ben Abbott <address@hidden> wrote:
>> With MacOS 10.7.x, Apple has deprecated CGDisplayBitsPerPixel.
> [snip]
>> Is the version of MacOS X available to the preprocessor ?
> 
> We test for features, not for versions. If you need that function or a
> replacement if it's absent, write an autoconf macro to test for it.
> There have been recent examples by Carlo about how to do this for NaN
> in Fortran and std::bit_and for C++.
> 
> HTH,
> - Jordi G. H.

Jordi / others,

The code below is intended to be added to ./m4/acinclude.m4. I'm not familiar 
with the naming of variables. Are my choices acceptable ?

dnl
AC_DEFUN([CARBON_HAS_CGDISPLAYBITSPERPIXEL],
[AC_CACHE_CHECK([whether CGDisplayBitsPerPixel is defined in the Carbon 
Framework],
carbon_cv_has_cgdisplaybitsperpixel,
[AC_LANG_PUSH(C++)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <Carbon/Carbon.h>]],
[[int main (void)]]
[[{]]
[[  CGDirectDisplayID display = CGMainDisplayID ();]]
[[  size_t depth = CGDisplayBitsPerPixel (display);]]
[[  return 0;]]
[[}]])],
carbon_cv_has_cgdisplaybitsperpixel=yes, 
carbon_cv_has_cgdisplaybitsperpixel=no)])
if test $carbon_cv_cgdisplaybitsperpixel = yes; then
AC_DEFINE(CARBON_HAS_CGDISPLAYBITSPERPIXEL,1,[Define if Carbon Framework has 
CGDisplayBitsPerPixel])
fi
AC_LANG_POP(C++)
])

Ben