basic project

cmake/CompilerFlags.cmake

@@ -0,0 +1,52 @@
+
+# Core compile arguments used for the whole native project
+
+if(NOT TV2HV_LINKER)
+	message(FATAL_ERROR "Somehow we got here without a set TV2HV_LINKER, bailing.")
+endif()
+
+# This isn't really the best place to put this, but it's probably the only one which makes sense.
+set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+
+# TODO: Use a list so that this isn't one giant line, and we can just append compile flags to it as needed
+set(TV2HV_CORE_COMPILE_ARGS "-Wall -Wno-builtin-declaration-mismatch -Wformat=2 -fstrict-flex-arrays=3 -fstack-clash-protection -fstack-protector-strong")
+set(TV2HV_CORE_LINKER_ARGS "-fuse-ld=${TV2HV_LINKER}")
+
+if("${CMAKE_BUILD_TYPE}" STREQUAL "Release" OR "${CMAKE_BUILD_TYPE}" STREQUAL "RelWithDebInfo")
+	# Disable C assert() in release builds (needed since we wipe cmake core args) and enable FORTIFY_SOURCE
+	set(TV2HV_CORE_COMPILE_ARGS "${TV2HV_CORE_COMPILE_ARGS} -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -DNDEBUG")
+
+	# If on Release and we are prompted to use link-time optimizations do so
+	if("lto" IN_LIST TV2HV_BUILD_FEATURES)
+		# On clang we use ThinLTO for even better build performance.
+		if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+			message(STATUS "CompilerFlags: Using LLVM ThinLTO")
+			set(TV2HV_CORE_COMPILE_ARGS "${TV2HV_CORE_COMPILE_ARGS} -flto=thin")
+			set(TV2HV_CORE_LINKER_ARGS "${TV2HV_CORE_LINKER_ARGS} -flto=thin")
+		else()
+			message(STATUS "CompilerFlags: Using LTO")
+			set(TV2HV_CORE_COMPILE_ARGS "${TV2HV_CORE_COMPILE_ARGS} -flto")
+			set(TV2HV_CORE_LINKER_ARGS "${TV2HV_CORE_LINKER_ARGS} -flto")
+		endif()
+	endif()
+endif()
+
+include(SanitizerSetup)
+
+# Set core CMake toolchain variables so that they get applied to all projects.
+# A bit nasty, but /shrug, this way our third party libraries can be mostly sanitized/etc as well.
+#
+# Note that -g3 in release flags is temporary, and will be removed once we don't need it
+
+set(CMAKE_C_FLAGS "${TV2HV_CORE_COMPILE_ARGS}")
+set(CMAKE_CXX_FLAGS "${TV2HV_CORE_COMPILE_ARGS}")
+
+set(CMAKE_C_FLAGS_DEBUG "-O0 -g3")
+set(CMAKE_C_FLAGS_RELWITHDEBINFO "-O3 -g3")
+set(CMAKE_C_FLAGS_RELEASE "-O3 -g3")
+
+set(CMAKE_CXX_FLAGS_DEBUG "-O0 -g3")
+set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O3 -g3")
+set(CMAKE_CXX_FLAGS_RELEASE "-O3 -g3")
+
+set(CMAKE_EXE_LINKER_FLAGS "${TV2HV_CORE_LINKER_ARGS} -Wl,-z,noexecstack,-z,relro,-z,now")