[glib/glib-2-64: 1/2] meson: Don't use gnulib for printf on iOS

[Sebastian Dröge <sdroege src gnome org>]

commit 41af1187c3fb26baa4404c70d74b1294f6d887db
Author: Nirbheek Chauhan <nirbheek centricular com>
Date:   Thu Aug 6 05:02:59 2020 +0530

    meson: Don't use gnulib for printf on iOS
    
    iOS and tvOS use the same printf family as macOS, and these all have
    been available on macOS for a long time.
    
    Closes https://gitlab.gnome.org/GNOME/glib/-/issues/1868

 meson.build | 9 +++++++++
 1 file changed, 9 insertions(+)
---
diff --git a/meson.build b/meson.build
index 7c80472d8..810649376 100644
--- a/meson.build
+++ b/meson.build
@@ -834,6 +834,15 @@ if host_system == 'windows' and (cc.get_id() == 'msvc' or cc.get_id() == 'clang-
   glib_conf.set('HAVE_C99_SNPRINTF', false)
   glib_conf.set('HAVE_C99_VSNPRINTF', false)
   glib_conf.set('HAVE_UNIX98_PRINTF', false)
+elif not cc_can_run and host_system in ['ios', 'darwin']
+  # All these are true when compiling natively on macOS, so we should use good
+  # defaults when building for iOS and tvOS.
+  glib_conf.set('HAVE_C99_SNPRINTF', true)
+  glib_conf.set('HAVE_C99_VSNPRINTF', true)
+  glib_conf.set('HAVE_UNIX98_PRINTF', true)
+  have_good_vsnprintf = true
+  have_good_snprintf = true
+  have_good_printf = true
 else
   vsnprintf_c99_test_code = '''
 #include <stdio.h>