elf.c: section limit inference for linux, fixes for stb_ds.h hashing, more compilation flags

CMakeLists.txt

@@ -23,6 +23,14 @@ add_subdirectory(third-party/physfs)
 add_subdirectory(third-party/libxm)
 
 
+if(UNIX)
+        set(SYSTEM_SOURCE_FILES
+                src/system/linux/elf.c
+        )
+else()
+        set(SYSTEM_SOURCE_FILES)
+endif()
+
 set(SOURCE_FILES
         third-party/physfs/extras/physfsrwops.c
         third-party/stb/stb_vorbis.c
@@ -49,6 +57,8 @@ set(SOURCE_FILES
         src/game/scenes/scene.c src/game/scenes/scene.h
         src/game/scenes/title.c src/game/scenes/title.h
         src/game/scenes/ingame.c src/game/scenes/ingame.h
+
+        ${SYSTEM_SOURCE_FILES}
 )
 
 # target
@@ -90,19 +100,24 @@ else()
                 # these SHOULDN'T break anything...
                 -fno-math-errno
                 -ffp-contract=fast
-                -fno-signed-zeros
-                -fno-trapping-math
-                -freciprocal-math)
+                -fno-signed-zeros)
         set(BUILD_FLAGS_RELEASE
+                -O3
                 -flto
                 -Wl,-gc-sections
                 -fdata-sections
-                -ffunction-sections)
+                -ffunction-sections
+                -funroll-loops
+                -fomit-frame-pointer
+                -fallow-store-data-races)
         set(BUILD_FLAGS_DEBUG
+                -O0
                 -g3
                 -gdwarf
+                -fno-omit-frame-pointer
+                -fstack-protector-all
                 -fsanitize=undefined
-                -fsanitize-trap=undefined)
+                -fsanitize=address)
         target_compile_options(${PROJECT_NAME} PRIVATE
                                                ${WARNING_FLAGS}
                                                ${BUILD_FLAGS}