cmake: fixes to enable linux compilation

string.c, capitalization, find fixes

cmake/Modules/FindSDL2.cmake

@@ -27,19 +27,8 @@ find_library(SDL2_LIBRARY
 		"/usr/local/lib"
 )
 
-find_library(SDL2_MAIN_LIBRARY
-	NAMES SDL2_main
-	PATHS
-		${SDL2_PKGCONF_LIBRARY_DIRS}
-		/usr/lib
-		/usr/local/lib
-)
-
 
 # set include dir variables
 set(SDL2_PROCESS_INCLUDES SDL2_INCLUDE_DIR)
 set(SDL2_PROCESS_LIBS SDL2_LIBRARY)
-set(SDL2_MAIN_PROCESS_INCLUDES SDL2_INCLUDE_DIR)
-set(SDL2_MAIN_PROCESS_LIBS SDL2_MAIN_LIBRARY)
 libfind_process(SDL2)
-libfind_process(SDL2_MAIN)

cmake/Modules/FindSDL2_main.cmake

@@ -11,7 +11,7 @@ libfind_pkg_check_modules(SDL2_MAIN_PKGCONF SDL2)
 
 # includes
 find_path(SDL2_MAIN_INCLUDE_DIR
-	NAMES SDL_main.h
+	NAMES SDL.h
 	PATHS
 		${SDL2_MAIN_PKGCONF_INCLUDE_DIRS}
 		"/usr/include/SDL2"

src/sdl/CMakeLists.txt

@@ -3,7 +3,7 @@
 set(SRB2_CONFIG_SDL2_USEMIXER ON CACHE BOOL "Use SDL2_mixer or regular sdl sound")
 
 if(${SRB2_CONFIG_SDL2_USEMIXER})
-	find_package(SDL2_MIXER)
+	find_package(SDL2_mixer)
 	if(${SDL2_MIXER_FOUND})
 		set(SRB2_HAVE_MIXER ON)
 		set(SRB2_SDL2_SOUNDIMPL mixer_sound.c)
@@ -75,6 +75,10 @@ if(${SDL2_FOUND})
 		set(SRB2_SDL2_TOTAL_SOURCES ${SRB2_SDL2_TOTAL_SOURCES}
 			${CMAKE_SOURCE_DIR}/src/win32/win_dbg.c
 			${CMAKE_SOURCE_DIR}/src/win32/Srb2win.rc
+		)
+	endif()
+	if(NOT CLANG)
+		set(SRB2_SDL2_TOTAL_SOURCES ${SRB2_SDL2_TOTAL_SOURCES}
 			${CMAKE_SOURCE_DIR}/src/string.c
 		)
 	endif()
@@ -109,6 +113,8 @@ if(${SDL2_FOUND})
 			${PNG_LIBRARIES}
 			${ZLIB_LIBRARIES}
 			${OPENGL_LIBRARIES}
+			m #need math lol
+			rt # this too
 		)
 
 	endif()