From: Andrew Udvare <audvare@gmail.com>
Subject: [PATCH] Return a value when the shader file cannot be opened

loadShader() only returns from inside the if(shader_file.is_open()) block, so
the path taken when the file is missing runs off the end of a function
returning bool. That is undefined behaviour, and GCC warns about it with
-Wreturn-type; whatever happens to be in the return register decides whether
the caller believes the shader loaded.

That is exactly the case worth getting right, because it is the one taken when
n64.psh cannot be found.

diff --git a/Source/SysGL/HLEGraphics/RendererGL.cpp b/Source/SysGL/HLEGraphics/RendererGL.cpp
index 0806add..b76c7ff 100644
--- a/Source/SysGL/HLEGraphics/RendererGL.cpp
+++ b/Source/SysGL/HLEGraphics/RendererGL.cpp
@@ -111,6 +111,9 @@ bool loadShader(const std::filesystem::path& shader_path)
 
 	return true;
 	}
+
+	std::cerr << "ERROR: Could not open shader source " << shader_path << std::endl;
+	return false;
 }
 
 bool initgl()