From f2ae1a25457ea679f2964a5d3d351d0a1e58750b Mon Sep 17 00:00:00 2001
From: Mathieu Comandon <strycore@gmail.com>
Date: Sat, 7 Nov 2015 10:50:47 -0800
Subject: [PATCH] Implement relocatable builds on Linux

- Change the path of the Sys folder to the executable's location
- Add LINUX_LOCAL_DEV flag to use relocatable version on Linux
- Add CMake definition for relocatable build
---
 CMakeLists.txt                   |  6 ++++++
 Source/Core/Common/CommonPaths.h |  2 +-
 Source/Core/Common/FileUtil.cpp  | 16 +++++++++++++---
 Source/Core/Common/FileUtil.h    |  2 --
 4 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 853f206cd3..c3f7b12354 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -312,6 +312,12 @@ if(WIN32)
 	add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
 endif(WIN32)
 
+# Add an option to build relocatable binaries on Linux
+# The Sys folder will need to be copied to the Binaries folder.
+if(UNIX)
+	add_definitions(-DLINUX_LOCAL_DEV=0)
+endif(UNIX)
+
 # Dolphin requires threads.
 # The Apple build may not need an explicit flag because one of the
 # frameworks may already provide it.
diff --git a/Source/Core/Common/CommonPaths.h b/Source/Core/Common/CommonPaths.h
index 41cb65c24c..5d81bd29e7 100644
--- a/Source/Core/Common/CommonPaths.h
+++ b/Source/Core/Common/CommonPaths.h
@@ -32,7 +32,7 @@
 #endif
 
 // Shared data dirs (Sys and shared User for Linux)
-#ifdef _WIN32
+#if defined(_WIN32) || defined(LINUX_LOCAL_DEV)
 	#define SYSDATA_DIR "Sys"
 #elif defined __APPLE__
 	#define SYSDATA_DIR "Contents/Resources/Sys"
diff --git a/Source/Core/Common/FileUtil.cpp b/Source/Core/Common/FileUtil.cpp
index 84961d54ad..585b0c5cc1 100644
--- a/Source/Core/Common/FileUtil.cpp
+++ b/Source/Core/Common/FileUtil.cpp
@@ -728,12 +728,12 @@ std::string GetBundleDirectory()
 }
 #endif
 
-#ifdef _WIN32
 std::string& GetExeDirectory()
 {
 	static std::string DolphinPath;
 	if (DolphinPath.empty())
 	{
+#ifdef _WIN32
 		TCHAR Dolphin_exe_Path[2048];
 		TCHAR Dolphin_exe_Clean_Path[MAX_PATH];
 		GetModuleFileName(nullptr, Dolphin_exe_Path, 2048);
@@ -742,10 +742,20 @@ std::string& GetExeDirectory()
 		else
 			DolphinPath = TStrToUTF8(Dolphin_exe_Path);
 		DolphinPath = DolphinPath.substr(0, DolphinPath.find_last_of('\\'));
+#else
+		char Dolphin_exe_Path[PATH_MAX];
+		ssize_t len = ::readlink("/proc/self/exe", Dolphin_exe_Path, sizeof(Dolphin_exe_Path));
+		if (len == -1 || len == sizeof(Dolphin_exe_Path))
+		{
+			len = 0;
+		}
+		Dolphin_exe_Path[len] = '\0';
+		DolphinPath = Dolphin_exe_Path;
+		DolphinPath = DolphinPath.substr(0, DolphinPath.rfind('/'));
+#endif
 	}
 	return DolphinPath;
 }
-#endif
 
 std::string GetSysDirectory()
 {
@@ -753,7 +763,7 @@ std::string GetSysDirectory()
 
 #if defined (__APPLE__)
 	sysDir = GetBundleDirectory() + DIR_SEP + SYSDATA_DIR;
-#elif defined (_WIN32)
+#elif defined (_WIN32) || defined (LINUX_LOCAL_DEV)
 	sysDir = GetExeDirectory() + DIR_SEP + SYSDATA_DIR;
 #else
 	sysDir = SYSDATA_DIR;
diff --git a/Source/Core/Common/FileUtil.h b/Source/Core/Common/FileUtil.h
index fefbed193d..0736d7c88f 100644
--- a/Source/Core/Common/FileUtil.h
+++ b/Source/Core/Common/FileUtil.h
@@ -145,9 +145,7 @@ std::string GetSysDirectory();
 std::string GetBundleDirectory();
 #endif
 
-#ifdef _WIN32
 std::string &GetExeDirectory();
-#endif
 
 bool WriteStringToFile(const std::string& str, const std::string& filename);
 bool ReadFileToString(const std::string& filename, std::string& str);