From 219b6593209fda7d25dafb0151b73f2cf9b7eb5f Mon Sep 17 00:00:00 2001
From: Ignacio Casal Quinteiro <qignacio@amazon.com>
Date: Wed, 30 Dec 2020 13:38:46 +0100
Subject: [PATCH] deinterlace: force -DPREFIX on macos

This is due to a bug in meson where it will not detect properly
the compiler if the symbols need an undercore.
https://github.com/mesonbuild/meson/issues/5482

Fixes #821

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/845>
---
 gst/deinterlace/meson.build | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/gst/deinterlace/meson.build b/gst/deinterlace/meson.build
index 4c747b7659..5eae029ebb 100644
--- a/gst/deinterlace/meson.build
+++ b/gst/deinterlace/meson.build
@@ -49,7 +49,12 @@ if have_nasm and host_cpu == 'x86_64'
   endif
 
   # Assembly has to be told when the symbols have to be prefixed with _
-  if cc.symbols_have_underscore_prefix()
+  # Note that symbols_have_underscore_prefix does not work properly on macos
+  # if the compiler -g flag is used. See:
+  # https://github.com/mesonbuild/meson/issues/5482
+  if ['darwin', 'ios'].contains(host_system)
+    asm_prefix_def = '-DPREFIX'
+  elif cc.symbols_have_underscore_prefix()
     asm_prefix_def = '-DPREFIX'
   else
     asm_prefix_def = '-UPREFIX'