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occt/adm/cmake/occt_defs_flags.cmake
ddzama e92d322d40 0032921: Configuration, CMake - allow selecting C++ standard. 
Make C++ standard to be enable from cmake settings:

User will be able choosing C++ language standard by selecting cmake variable BUILD_CPP_STANDARD.
For correct working, CMAKE_CXX_STANDARD cmake built-in variable should be available.
To enable CMAKE_CXX_STANDARD, minimum CMAKE version has been updated to 3.1.

Available next standard items:
C++11
C++14
C++17
C++20
C++23

This issue consists from several steps to achive main goal:
1) Configuratiuon, CMake - allow selecting C++ standard.
2) Require minimum CMAKE version 3.1 (for enabling CMAKE_CXX_STANDARD).
3) More flexible CMAKE_CXX_COMPILER_ID identification (fixups previous commit!)
4) Add description of new CMAKE variable `BUILD_CPP_STANDARD` into documentation.
5) Update CMAKE requirements in documentation.
6) Set C++11 standard for several projects.
2022-09-06 20:06:54 +03:00

160 lines
6.2 KiB
CMake
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##
if(FLAGS_ALREADY_INCLUDED)
return()
endif()
set(FLAGS_ALREADY_INCLUDED 1)
# force option /fp:precise for Visual Studio projects.
#
# Note that while this option is default for MSVC compiler, Visual Studio
# project can be switched later to use Intel Compiler (ICC).
# Enforcing -fp:precise ensures that in such case ICC will use correct
# option instead of its default -fp:fast which is harmful for OCCT.
if (MSVC)
set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /fp:precise")
set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /fp:precise")
endif()
# add SSE2 option for old MSVC compilers (VS 2005 - 2010, 32 bit only)
if (NOT CMAKE_SIZEOF_VOID_P EQUAL 8)
if (MSVC AND ((MSVC_VERSION EQUAL 1400) OR (MSVC_VERSION EQUAL 1500) OR (MSVC_VERSION EQUAL 1600)))
set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /arch:SSE2")
set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /arch:SSE2")
endif()
endif()
if (MSVC)
# suppress C26812 on VS2019/C++20 (prefer 'enum class' over 'enum')
set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /fp:precise /wd\"26812\"")
# suppress warning on using portable non-secure functions in favor of non-portable secure ones
add_definitions (-D_CRT_SECURE_NO_WARNINGS -D_CRT_NONSTDC_NO_DEPRECATE)
else()
set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fexceptions -fPIC")
set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fexceptions -fPIC")
add_definitions(-DOCC_CONVERT_SIGNALS)
endif()
# enable structured exceptions for MSVC
string (REGEX MATCH "EHsc" ISFLAG "${CMAKE_CXX_FLAGS}")
if (ISFLAG)
string (REGEX REPLACE "EHsc" "EHa" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
elseif (MSVC)
set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /EHa")
endif()
if (MSVC)
# string pooling (GF), function-level linking (Gy)
set (CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /GF /Gy")
set (CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /GF /Gy")
if (BUILD_FORCE_RelWithDebInfo)
# generate debug info (Zi), inline expansion level (Ob1)
set (CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Zi /Ob1")
set (CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /Zi /Ob1")
# generate debug info (debug), OptimizeReferences=true (OPT:REF), EnableCOMDATFolding=true (OPT:ICF)
set (CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} /debug /OPT:REF /OPT:ICF")
endif()
endif()
# remove _WINDOWS flag if it exists
string (REGEX MATCH "/D_WINDOWS" IS_WINDOWSFLAG "${CMAKE_CXX_FLAGS}")
if (IS_WINDOWSFLAG)
message (STATUS "Info: /D_WINDOWS has been removed from CMAKE_CXX_FLAGS")
string (REGEX REPLACE "/D_WINDOWS" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
endif()
# remove WIN32 flag if it exists
string (REGEX MATCH "/DWIN32" IS_WIN32FLAG "${CMAKE_CXX_FLAGS}")
if (IS_WIN32FLAG)
message (STATUS "Info: /DWIN32 has been removed from CMAKE_CXX_FLAGS")
string (REGEX REPLACE "/DWIN32" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
endif()
# remove _WINDOWS flag if it exists
string (REGEX MATCH "/D_WINDOWS" IS_WINDOWSFLAG "${CMAKE_C_FLAGS}")
if (IS_WINDOWSFLAG)
message (STATUS "Info: /D_WINDOWS has been removed from CMAKE_C_FLAGS")
string (REGEX REPLACE "/D_WINDOWS" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
endif()
# remove WIN32 flag if it exists
string (REGEX MATCH "/DWIN32" IS_WIN32FLAG "${CMAKE_C_FLAGS}")
if (IS_WIN32FLAG)
message (STATUS "Info: /DWIN32 has been removed from CMAKE_C_FLAGS")
string (REGEX REPLACE "/DWIN32" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
endif()
# remove DEBUG flag if it exists
string (REGEX MATCH "-DDEBUG" IS_DEBUG_CXX "${CMAKE_CXX_FLAGS_DEBUG}")
if (IS_DEBUG_CXX)
message (STATUS "Info: -DDEBUG has been removed from CMAKE_CXX_FLAGS_DEBUG")
string (REGEX REPLACE "-DDEBUG" "" CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")
endif()
string (REGEX MATCH "-DDEBUG" IS_DEBUG_C "${CMAKE_C_FLAGS_DEBUG}")
if (IS_DEBUG_C)
message (STATUS "Info: -DDEBUG has been removed from CMAKE_C_FLAGS_DEBUG")
string (REGEX REPLACE "-DDEBUG" "" CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG}")
endif()
# enable parallel compilation on MSVC 9 and above
if (MSVC AND (MSVC_VERSION GREATER 1400))
set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP")
endif()
# generate a single response file which enlist all of the object files
if (NOT DEFINED CMAKE_C_USE_RESPONSE_FILE_FOR_OBJECTS)
SET(CMAKE_C_USE_RESPONSE_FILE_FOR_OBJECTS 1)
endif()
if (NOT DEFINED CMAKE_CXX_USE_RESPONSE_FILE_FOR_OBJECTS)
SET(CMAKE_CXX_USE_RESPONSE_FILE_FOR_OBJECTS 1)
endif()
# increase compiler warnings level (-W4 for MSVC, -Wextra for GCC)
if (MSVC)
if (CMAKE_CXX_FLAGS MATCHES "/W[0-4]")
string (REGEX REPLACE "/W[0-4]" "/W4" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
else()
set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W4")
endif()
elseif (CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX OR (CMAKE_CXX_COMPILER_ID MATCHES "[Cc][Ll][Aa][Nn][Gg]"))
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra")
if (CMAKE_CXX_COMPILER_ID MATCHES "[Cc][Ll][Aa][Nn][Gg]")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wshorten-64-to-32")
endif()
if (BUILD_SHARED_LIBS)
if (APPLE)
set (CMAKE_SHARED_LINKER_FLAGS "-lm ${CMAKE_SHARED_LINKER_FLAGS}")
elseif(NOT WIN32)
set (CMAKE_SHARED_LINKER_FLAGS "-lm ${CMAKE_SHARED_LINKER_FLAGS}")
endif()
endif()
endif()
if (CMAKE_CXX_COMPILER_ID MATCHES "[Cc][Ll][Aa][Nn][Gg]")
if (APPLE)
# CLang can be used with both libstdc++ and libc++, however on OS X libstdc++ is outdated.
set (CMAKE_CXX_FLAGS "-stdlib=libc++ ${CMAKE_CXX_FLAGS}")
endif()
# Optimize size of binaries
set (CMAKE_SHARED_LINKER_FLAGS "-Wl,-s ${CMAKE_SHARED_LINKER_FLAGS}")
elseif(MINGW)
add_definitions(-D_WIN32_WINNT=0x0601)
# _WIN32_WINNT=0x0601 (use Windows 7 SDK)
#set (CMAKE_SYSTEM_VERSION "6.1")
# workaround bugs in mingw with vtable export
set (CMAKE_SHARED_LINKER_FLAGS "-Wl,--export-all-symbols")
# Optimize size of binaries
set (CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -s")
set (CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -s")
elseif (DEFINED CMAKE_COMPILER_IS_GNUCXX)
# Optimize size of binaries
set (CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -s")
set (CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -s")
endif()
if (BUILD_RELEASE_DISABLE_EXCEPTIONS)
set (CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -DNo_Exception")
set (CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -DNo_Exception")
endif()
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