From d93b27f16cd9f549f13da9ab3baec6a7cde2c98e Mon Sep 17 00:00:00 2001
From: Erwin Coumans <erwincoumans@google.com>
Date: Mon, 18 Aug 2014 22:19:34 -0700
Subject: [PATCH] premake4: add option to force dynamic loading of OpenGL and
 X11 --force_dlopen_opengl and --force_dlopen_x11

---
 build3/findOpenGLGlewGlut.lua | 17 +++++++++--------
 build3/premake4.lua           | 13 +++++++++++++
 2 files changed, 22 insertions(+), 8 deletions(-)

diff --git a/build3/findOpenGLGlewGlut.lua b/build3/findOpenGLGlewGlut.lua
index cf8521c9d..bf0dfb42e 100644
--- a/build3/findOpenGLGlewGlut.lua
+++ b/build3/findOpenGLGlewGlut.lua
@@ -14,8 +14,8 @@
 		configuration {"MacOSX"}
  			links { "OpenGL.framework"} 
 		configuration {"not Windows", "not MacOSX"}
-			if os.isdir("/usr/include") and os.isfile("/usr/include/GL/gl.h") then
-				links {"GL","GLU"}
+			if not  _OPTIONS["force_dlopen_opengl"] and (os.isdir("/usr/include") and os.isfile("/usr/include/GL/gl.h")) then
+				links {"GL"}
 			else
 				print("No GL/gl.h found, using dynamic loading of GL using glew")
 				defines {"GLEW_INIT_OPENGL11_FUNCTIONS=1"}
@@ -57,16 +57,17 @@
 		end
 		if os.is("Linux") then
 			configuration{"Linux"}
-			--if os.isdir("/usr/include") and os.isfile("/usr/include/GL/glew.h") then 
-		--		links {"GLEW"}
-		--	else
-				--print("Using static glew and dynamic loading of glx functions")
+			if not _OPTIONS["force_dlopen_opengl"] and (os.isdir("/usr/include") and os.isfile("/usr/include/GL/gl.h") and os.isfile("/usr/include/GL/glew.h"))  then
+				links {"GLEW"}
+			else
+				print("Using static glew and dynamic loading of glx functions")
 			 	defines { "GLEW_STATIC","GLEW_DYNAMIC_LOAD_ALL_GLX_FUNCTIONS=1"}
                         	includedirs {
                                         projectRootDir .. "btgui/OpenGLWindow/GlewWindows"
                         	}
                         	files { projectRootDir .. "btgui/OpenGLWindow/GlewWindows/glew.c"}
-		--	end
+				links {"dl"}
+			end
 
 		end
 		configuration{}
@@ -74,7 +75,7 @@
 
 	function initX11()
 		if os.is("Linux") then
-			if os.isdir("/usr/include") and os.isfile("/usr/include/X11/X.h") then
+			if not _OPTIONS["force_dlopen_x11"] and (os.isdir("/usr/include") and os.isfile("/usr/include/X11/X.h")) then
 				links{"X11","pthread"}
 			else
 				print("No X11/X.h found, using dynamic loading of X11")
diff --git a/build3/premake4.lua b/build3/premake4.lua
index 558681cd6..e0b9c72fe 100644
--- a/build3/premake4.lua
+++ b/build3/premake4.lua
@@ -12,6 +12,19 @@
         act = _ACTION
     end
 
+	newoption
+        {
+                trigger = "force_dlopen_opengl",
+                description = "Dynamically load OpenGL (instead of static/dynamic linking)"
+        }
+
+	newoption
+        {
+                trigger = "force_dlopen_x11",
+                description = "Dynamically load OpenGL (instead of static/dynamic linking)"
+        }
+
+
 	newoption
 	{
 		trigger = "midi",