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# Macro which contains all bits to setup the compile flags correctly.
#
# compile_flags()
#
macro(compile_flags)
if(MSVC)
# Switch to MT (static) instead of MD (dynamic) binary
# For MSVC two generators are available
# - a command line generator (Ninja) using CMAKE_BUILD_TYPE to specify the
# configuration of the build tree
# - an IDE generator (Visual Studio) using CMAKE_CONFIGURATION_TYPES to
# specify all configurations that will be available in the generated solution
list(APPEND MSVC_CONFIGS "${CMAKE_BUILD_TYPE}" "${CMAKE_CONFIGURATION_TYPES}")
# Set usage of static runtime for all configurations
foreach(MSVC_CONFIG ${MSVC_CONFIGS})
string(TOUPPER "CMAKE_CXX_FLAGS_${MSVC_CONFIG}" MSVC_FLAGS)
string(REPLACE "/MD" "/MT" ${MSVC_FLAGS} "${${MSVC_FLAGS}}")
endforeach()
# "If /Zc:rvalueCast is specified, the compiler follows section 5.4 of the
# C++11 standard". We need C++11 for the way we use threads.
add_compile_options(/Zc:rvalueCast)
if(NOT CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
# Enable multi-threaded compilation.
add_compile_options(/MP)
endif()
# Add DPI manifest to project; other WIN32 targets get this via ottdres.rc
list(APPEND GENERATED_SOURCE_FILES "${CMAKE_SOURCE_DIR}/os/windows/openttd.manifest")
endif()
# Add some -D flags for Debug builds. We cannot use add_definitions(), because
# it does not appear to support the $<> tags.
add_compile_options(
"$<$<CONFIG:Debug>:-D_DEBUG>"
"$<$<NOT:$<CONFIG:Debug>>:-D_FORTIFY_SOURCE=2>" # FORTIFY_SOURCE should only be used in non-debug builds (requires -O1+)
)
if(MINGW)
add_link_options(
"$<$<NOT:$<CONFIG:Debug>>:-fstack-protector>" # Prevent undefined references when _FORTIFY_SOURCE > 0
)
endif()
# Prepare a generator that checks if we are not a debug, and don't have asserts
# on. We need this later on to set some compile options for stable releases.
set(IS_STABLE_RELEASE "$<AND:$<NOT:$<CONFIG:Debug>>,$<NOT:$<BOOL:${OPTION_USE_ASSERTS}>>>")
if(MSVC)
add_compile_options(/W3)
elseif(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" OR CMAKE_CXX_COMPILER_ID STREQUAL "Clang" OR CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
add_compile_options(
-W
-Wall
-Wcast-qual
-Wextra
-Wsign-compare
-Wundef
-Wpointer-arith
-Wwrite-strings
-Wredundant-decls
-Wformat-security
-Wformat=2
-Winit-self
-Wnon-virtual-dtor
# Often parameters are unused, which is fine.
-Wno-unused-parameter
# We use 'ABCD' multichar for SaveLoad chunks identifiers
-Wno-multichar
# Compilers complains about that we break strict-aliasing.
# On most places we don't see how to fix it, and it doesn't
# break anything. So disable strict-aliasing to make the
# compiler all happy.
-fno-strict-aliasing
)
# When we are a stable release (Release build + USE_ASSERTS not set),
# assertations are off, which trigger a lot of warnings. We disable
# these warnings for these releases.
if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
add_compile_options(
"$<${IS_STABLE_RELEASE}:-Wno-unused-variable>"
"$<${IS_STABLE_RELEASE}:-Wno-unused-but-set-parameter>"
"$<${IS_STABLE_RELEASE}:-Wno-unused-but-set-variable>"
)
else()
add_compile_options(
"$<${IS_STABLE_RELEASE}:-Wno-unused-variable>"
"$<${IS_STABLE_RELEASE}:-Wno-unused-parameter>"
)
endif()
# Ninja processes the output so the output from the compiler
# isn't directly to a terminal; hence, the default is
# non-coloured output. We can override this to get nicely
# coloured output, but since that might yield odd results with
# IDEs, we extract it to an option.
if(OPTION_FORCE_COLORED_OUTPUT)
if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
add_compile_options (-fdiagnostics-color=always)
elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang" OR CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
add_compile_options (-fcolor-diagnostics)
endif()
endif()
if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
include(CheckCXXCompilerFlag)
check_cxx_compiler_flag("-flifetime-dse=1" LIFETIME_DSE_FOUND)
add_compile_options(
# GCC 4.2+ automatically assumes that signed overflows do
# not occur in signed arithmetics, whereas we are not
# sure that they will not happen. It furthermore complains
# about its own optimized code in some places.
"-fno-strict-overflow"
# Prevent optimisation supposing enums are in a range specified by the standard
# For details, see http://gcc.gnu.org/PR43680
"-fno-tree-vrp"
# -flifetime-dse=2 (default since GCC 6) doesn't play
# well with our custom pool item allocator
"$<$<BOOL:${LIFETIME_DSE_FOUND}>:-flifetime-dse=1>"
)
endif()
elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Intel")
add_compile_options(
-Wall
# warning #873: function ... ::operator new ... has no corresponding operator delete ...
-wd873
# warning #1292: unknown attribute "fallthrough"
-wd1292
# warning #1899: multicharacter character literal (potential portability problem)
-wd1899
# warning #2160: anonymous union qualifier is ignored
-wd2160
)
else()
message(FATAL_ERROR "No warning flags are set for this compiler yet; please consider creating a Pull Request to add support for this compiler.")
endif()
if(NOT WIN32)
# rdynamic is used to get useful stack traces from crash reports.
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -rdynamic")
endif()
endmacro()
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