[glibmm: 1/2] Meson build: fix is_os_cocoa detection

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 2bbaf923f9ee51afc199f4555db6edd43e3adba0
Author: Tom Schoonjans <Tom Schoonjans rfi ac uk>
Date:   Sat Nov 21 13:19:39 2020 +0000

    Meson build: fix is_os_cocoa detection
    
    The previous check didnt work as the compiler choked on the Objective-C code
    that was dragged in by the Cocoa headers.
    
    This patch simplifies things by simply asking what system the host is
    running on.

 meson.build | 16 +---------------
 1 file changed, 1 insertion(+), 15 deletions(-)
---
diff --git a/meson.build b/meson.build
index 4d2c13a6..fd253a60 100644
--- a/meson.build
+++ b/meson.build
@@ -45,21 +45,7 @@ project_build_root = meson.current_build_dir()
 cpp_compiler = meson.get_compiler('cpp')
 is_msvc = cpp_compiler.get_id() == 'msvc'
 is_host_windows = host_machine.system() == 'windows'
-
-is_os_cocoa = false
-if not is_host_windows
-  # This test for Mac OS is copied from glib. If the result of glib's test
-  # is ever made available outside glib, use glib's result instead of this test.
-  # glib: https://bugzilla.gnome.org/show_bug.cgi?id=780309
-  # glibmm: https://bugzilla.gnome.org/show_bug.cgi?id=781947
-  is_os_cocoa = cpp_compiler.compiles(
-    '''#include <Cocoa/Cocoa.h>
-    #ifdef GNUSTEP_BASE_VERSION
-    #error "Detected GNUstep, not Cocoa"
-    #endif''',
-    name: 'Mac OS X Cocoa support'
-  )
-endif
+is_os_cocoa = host_machine.system() == 'darwin'
 
 python3 = import('python').find_installation()
 python_version = python3.language_version()