From ca5b0928075a22693d6bf07e7a5dbab41e3ca286 Mon Sep 17 00:00:00 2001
From: Clownacy <Clownacy@users.noreply.github.com>
Date: Wed, 1 Apr 2020 20:14:44 +0100
Subject: [PATCH] Add static-linkage support to CMake file

Well, kind of.

It uses pkg-config and GCC's `-static' flag. It's very tied the Linux
way of doing things.
---
 CMakeLists.txt | 49 ++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 44 insertions(+), 5 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index dbeb2665..5337ff22 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -18,8 +18,9 @@ option(DEBUG_SAVE "Re-enable the ability to drag-and-drop save files onto the wi
 set(BACKEND_RENDERER "SDLTexture" CACHE STRING "Which renderer the game should use: 'OpenGL3' for an OpenGL 3.2 renderer, 'OpenGLES2' for an OpenGL ES 2.0 renderer, 'SDLTexture' for SDL2's hardware-accelerated Texture API, 'SDLSurface' for SDL2's software-rendered Surface API, or 'Software' for a handwritten software renderer")
 set(BACKEND_AUDIO "SDL2" CACHE STRING "Which audio backend the game should use: 'SDL2' or 'miniaudio'")
 
+option(STATIC_LINKAGE "On platforms with pkg-config, static-link the dependencies" OFF)
 option(LTO "Enable link-time optimisation" OFF)
-option(MSVC_LINK_STATIC_RUNTIME "Link the static MSVC runtime library" OFF)
+option(MSVC_LINK_STATIC_RUNTIME "Link the static MSVC runtime library (Visual Studio only)" OFF)
 
 option(FORCE_LOCAL_LIBS "Compile the built-in versions of SDL2, FreeType, and FLTK instead of using the system-provided ones" OFF)
 
@@ -258,6 +259,10 @@ if(DEBUG_SAVE)
 	target_compile_definitions(CSE2 PRIVATE DEBUG_SAVE)
 endif()
 
+if(STATIC_LINKAGE)
+	target_link_options(CSE2 PRIVATE "-static")
+endif()
+
 if(LTO)
 	include(CheckIPOSupported)
 
@@ -372,10 +377,29 @@ set_target_properties(CSE2 PROPERTIES
 ################
 
 if(NOT FORCE_LOCAL_LIBS)
-	find_package(SDL2)
+	find_package(PkgConfig QUIET)
 endif()
 
-if(TARGET SDL2::SDL2)
+if(NOT FORCE_LOCAL_LIBS)
+	find_package(SDL2)
+
+	if (PKG_CONFIG_FOUND)
+		pkg_check_modules(sdl2 QUIET sdl2)
+	endif()
+endif()
+
+if(sdl2_FOUND)
+	# pkg-config
+	if (STATIC_LINKAGE)
+		message(STATUS "Using system SDL2 (pkg-config, static)")
+		target_compile_options(CSE2 PRIVATE ${sdl2_STATIC_CFLAGS})
+		target_link_libraries(CSE2 PRIVATE ${sdl2_STATIC_LIBRARIES})
+	else()
+		message(STATUS "Using system SDL2 (pkg-config, dynamic)")
+		target_compile_options(CSE2 PRIVATE ${sdl2_CFLAGS})
+		target_link_libraries(CSE2 PRIVATE ${sdl2_LIBRARIES})
+	endif()
+elseif(TARGET SDL2::SDL2)
 	# CMake-generated config (Arch, vcpkg, Raspbian)
 	message(STATUS "Using system SDL2 (CMake, dynamic)")
 	target_link_libraries(CSE2 PRIVATE SDL2::SDL2 SDL2::SDL2main)
@@ -401,10 +425,25 @@ endif()
 
 if(NOT FORCE_LOCAL_LIBS)
 	find_package(Freetype)
+
+	if (PKG_CONFIG_FOUND)
+		pkg_check_modules(freetype2 QUIET freetype2)
+	endif()
 endif()
 
-if(FREETYPE_FOUND)
-	message(STATUS "Using system FreeType")
+if(freetype2_FOUND)
+	# pkg-config
+	if (STATIC_LINKAGE)
+		message(STATUS "Using system FreeType (pkg-config, static)")
+		target_compile_options(CSE2 PRIVATE ${freetype2_STATIC_CFLAGS})
+		target_link_libraries(CSE2 PRIVATE ${freetype2_STATIC_LIBRARIES})
+	else()
+		message(STATUS "Using system FreeType (pkg-config, dynamic)")
+		target_compile_options(CSE2 PRIVATE ${freetype2_CFLAGS})
+		target_link_libraries(CSE2 PRIVATE ${freetype2_LIBRARIES})
+	endif()
+elseif(FREETYPE_FOUND)
+	message(STATUS "Using system FreeType (CMake)")
 	target_include_directories(CSE2 PRIVATE ${FREETYPE_INCLUDE_DIRS})
 	target_link_libraries(CSE2 PRIVATE ${FREETYPE_LIBRARIES})
 else()