[glib: 2/6] meson: Autodetect when building for iOS

[Sebastian Dröge <sdroege src gnome org>]

commit 3c78d0cec68740231d6d2baac64f9a3584f67ee1
Author: Nirbheek Chauhan <nirbheek centricular com>
Date:   Fri May 29 00:31:35 2020 +0530

    meson: Autodetect when building for iOS
    
    Instead of relying on `system` to be set correctly in the
    cross-compile file, detect when we're building for iOS/watchOS/tvOS.

 meson.build | 10 ++++++++++
 1 file changed, 10 insertions(+)
---
diff --git a/meson.build b/meson.build
index f9fb01e20..51554ef62 100644
--- a/meson.build
+++ b/meson.build
@@ -33,6 +33,16 @@ endif
 
 host_system = host_machine.system()
 
+if host_system == 'darwin'
+  ios_test_code = '''#include <TargetConditionals.h>
+  #if ! TARGET_OS_IPHONE
+  #error "Not iOS/tvOS/watchOS/iPhoneSimulator"
+  #endif'''
+  if cc.compiles(ios_test_code, name : 'building for iOS')
+    host_system = 'ios'
+  endif
+endif
+
 glib_version = meson.project_version()
 glib_api_version = '2.0'
 version_arr = glib_version.split('.')