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PCHgcc.cmake
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#===============================================================================
# @file PCHgcc.cmake
#
# @author Nicolas Richart <nicolas.richart@epfl.ch>
#
# @date creation: Wed Aug 31 2011
# @date last modification: Sun Jan 06 2013
#
# @brief
#
# @section LICENSE
#
# Copyright (©) 2014 EPFL (Ecole Polytechnique Fédérale de Lausanne)
# Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
#
# Akantu is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option) any
# later version.
#
# Akantu is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Akantu. If not, see <http://www.gnu.org/licenses/>.
#
#===============================================================================
# (ADD_PCH_RULE _header_filename _src_list)
# Version 7/26/2010 4:55pm
#
# use this macro before "add_executable"
#
# _header_filename
# header to make a .gch
#
# _src_list
# the variable name (do not use ${..}) which contains a
# a list of sources (a.cpp b.cpp c.cpp ...)
# This macro will append a header file to it, then this src_list can be used in
# "add_executable..."
#
#
# Now a .gch file should be generated and gcc should use it.
# (add -Winvalid-pch to the cpp flags to verify)
#
# make clean should delete the pch file
#
# example : ADD_PCH_RULE(headers.h myprog_SRCS)
function(ADD_PCH_RULE _header_filename _src_list)
set(_gch_filename "${CMAKE_CURRENT_BINARY_DIR}/${_header_filename}.gch")
list(APPEND ${_src_list} ${_gch_filename})
set(_args ${CMAKE_CXX_FLAGS} -D__aka_inline__=inline)
get_filename_component(_gch_filename_path ${_gch_filename} PATH)
file(MAKE_DIRECTORY ${_gch_filename_path})
# list(APPEND _args -c ${CMAKE_CURRENT_SOURCE_DIR}/${_header_filename})
list(APPEND _args -c ${CMAKE_CURRENT_SOURCE_DIR}/${_header_filename} -o ${_gch_filename} -Winvalid-pch)
get_directory_property(DIRINC INCLUDE_DIRECTORIES)
foreach (_inc ${DIRINC})
list(APPEND _args "-I" ${_inc})
endforeach(_inc ${DIRINC})
separate_arguments(_args)
set_source_files_properties(${CMAKE_CURRENT_BINARY_DIR}/${_header_filename} PROPERTIES GENERATED 1)
set_source_files_properties(${_gch_filename} PROPERTIES GENERATED 1)
add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${_header_filename}
COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_SOURCE_DIR}/${_header_filename} ${CMAKE_CURRENT_BINARY_DIR}/${_header_filename} # ensure same directory! Required by gcc
DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${_header_filename}
)
add_custom_command(OUTPUT ${_gch_filename}
COMMAND ${CMAKE_CXX_COMPILER} ${CMAKE_CXX_COMPILER_ARG1} ${_args}
DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${_header_filename}
)
endfunction(ADD_PCH_RULE _header_filename _src_list)
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