[Bf-blender-cvs] [a7e92843f72] master: Fix: Build error on windows.

[Ray Molenkamp]

Commit: a7e92843f72efe0f395eb67d24a419f83f60dc70
Author: Ray Molenkamp
Date:   Tue Nov 2 07:43:44 2021 -0600
Branches: master
https://developer.blender.org/rBa7e92843f72efe0f395eb67d24a419f83f60dc70

Fix: Build error on windows.

External symbols in C files need
to be marked as such otherwise
the linker will not find them.

===================================================================

M	source/blender/draw/engines/image/image_shader.cc

===================================================================

diff --git a/source/blender/draw/engines/image/image_shader.cc b/source/blender/draw/engines/image/image_shader.cc
index f5128fa00c7..1c6abf36505 100644
--- a/source/blender/draw/engines/image/image_shader.cc
+++ b/source/blender/draw/engines/image/image_shader.cc
@@ -29,12 +29,14 @@
 #include "image_engine.h"
 #include "image_private.hh"
 
+extern "C" {
 extern char datatoc_common_colormanagement_lib_glsl[];
 extern char datatoc_common_globals_lib_glsl[];
 extern char datatoc_common_view_lib_glsl[];
 
 extern char datatoc_engine_image_frag_glsl[];
 extern char datatoc_engine_image_vert_glsl[];
+}
 
 namespace blender::draw::image_engine {
 
@@ -84,4 +86,3 @@ void IMAGE_shader_free()
 }
 
 }  // namespace blender::draw::image_engine
-