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################################################################################
#
# Program: 3D Slicer
#
# Copyright (c) Kitware Inc.
#
# See COPYRIGHT.txt
# or http://www.slicer.org/copyright/copyright.txt for details.
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# This file was originally developed by Jean-Christophe Fillion-Robin, Kitware Inc.
# and was partially funded by NIH grant 3P41RR013218-12S1
#
################################################################################
#
# Required C/CXX flags
#
#
# Usage: The variable Slicer_REQUIRED_C_FLAGS and Slicer_REQUIRED_CXX_FLAGS
# will set appropriately.
#
if(NOT DEFINED Slicer_REQUIRED_C_FLAGS OR NOT DEFINED Slicer_REQUIRED_CXX_FLAGS)
include(SlicerFunctionCheckCompilerFlags)
include(SlicerFunctionGetGccVersion)
set(tmp_c_flags)
set(tmp_cxx_flags)
if(CMAKE_COMPILER_IS_GNUCXX)
set(cflags "-Wall -Wextra -Wpointer-arith -Winvalid-pch -Wcast-align -Wwrite-strings -D_FORTIFY_SOURCE=2")
SlicerFunctionCheckCompilerFlags("-fdiagnostics-show-option" cflags)
SlicerFunctionCheckCompilerFlags("-Wl,--no-undefined" cflags)
slicerFunctionGetGccVersion(${CMAKE_CXX_COMPILER} GCC_VERSION)
# With older version of gcc supporting the flag -fstack-protector-all, an extra dependency to libssp.so
# is introduced. If gcc is smaller than 4.4.0 and the build type is Release let's not include the flag.
# Doing so should allow to build package made for distribution using older linux distro.
if(GCC_VERSION VERSION_GREATER "4.4.0" OR (CMAKE_BUILD_TYPE STREQUAL "Debug" AND GCC_VERSION VERSION_LESS "4.4.0"))
SlicerFunctionCheckCompilerFlags("-fstack-protector-all" cflags)
endif()
if(MINGW)
# suppress warnings about auto imported symbols
set(tmp_cxx_flags "-Wl,--enable-auto-import ${tmp_cxx_flags}")
endif()
# Note: -Wold-style-cast is too verbose
# Let's postpone the use of -Wsign-promo
set(tmp_c_flags "${cflags} ${tmp_c_flags}")
set(tmp_cxx_flags "${cflags} -Wno-deprecated -Woverloaded-virtual -Wstrict-null-sentinel ${tmp_cxx_flags}")
elseif(MSVC)
# if 64-bit Windows link with /bigobj
if(CMAKE_SIZEOF_VOID_P MATCHES 8)
set(tmp_c_flags /bigobj)
set(tmp_cxx_flags /bigobj)
endif()
if(MSVC_VERSION GREATER 1400)
set(CMAKE_CXX_MP_FLAG OFF CACHE BOOL "Build with /MP flag enabled")
set(PROCESSOR_COUNT "$ENV{NUMBER_OF_PROCESSORS}")
set(CMAKE_CXX_MP_NUM_PROCESSORS CACHE ${PROCESSOR_COUNT} "The maximum number of processes for the /MP flag")
if(CMAKE_CXX_MP_FLAG)
set(tmp_c_flags "${tmp_c_flags} /MP${CMAKE_CXX_MP_NUM_PROCESSORS}")
set(tmp_cxx_flags "${tmp_cxx_flags} /MP${CMAKE_CXX_MP_NUM_PROCESSORS}")
endif()
endif()
endif()
set(Slicer_REQUIRED_C_FLAGS ${tmp_c_flags})
set(Slicer_REQUIRED_CXX_FLAGS ${tmp_cxx_flags})
endif()
if(MSVC)
# Update CMake C/CXX flags associated with the current project.
string(REPLACE "/W3" "/W2" _cmake_c_flags "${CMAKE_C_FLAGS}")
set(CMAKE_C_FLAGS ${_cmake_c_flags} CACHE STRING "CMake C Flags" FORCE)
string(REPLACE "/W3" "/W2" _cmake_cxx_flags "${CMAKE_CXX_FLAGS}")
set(CMAKE_CXX_FLAGS ${_cmake_cxx_flags} CACHE STRING "CMake CXX Flags" FORCE)
# Also update CMAKE_{C,CXX}_FLAGS_INIT variables since they can be used to
# configure external projects. Note that settings these variables
# has no effect on the current project.
string(REPLACE "/W3" "/W2" CMAKE_C_FLAGS_INIT "${CMAKE_C_FLAGS_INIT}")
string(REPLACE "/W3" "/W2" CMAKE_CXX_FLAGS_INIT "${CMAKE_CXX_FLAGS_INIT}")
endif()
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