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#############################################################################
# Name: build/cmake/pch.cmake
# Purpose: precompiled header support for wxWidgets
# Author: Maarten Bent
# Created: 2022-04-15
# Copyright: (c) 2022 wxWidgets development team
# Licence: wxWindows licence
#############################################################################
if((wxBUILD_PRECOMP STREQUAL "ON" AND CMAKE_VERSION VERSION_LESS "3.16") OR (wxBUILD_PRECOMP STREQUAL "COTIRE"))
if(CMAKE_GENERATOR STREQUAL "Xcode")
# wxWidgets does not use the unity features of cotire so we can
# include Obj-C files when using precompiled headers with Xcode
set(COTIRE_UNITY_SOURCE_EXCLUDE_EXTENSIONS "" CACHE STRING "wxWidgets override of cotire exclude")
endif()
include(cotire)
endif()
# Enable precompiled headers for target
macro(wx_target_enable_precomp target_name prec_header)
if(wxBUILD_PRECOMP)
target_compile_definitions(${target_name} PRIVATE WX_PRECOMP)
if(CMAKE_VERSION VERSION_LESS "3.16" OR wxBUILD_PRECOMP STREQUAL "COTIRE")
set_target_properties(${target_name} PROPERTIES COTIRE_CXX_PREFIX_HEADER_INIT ${prec_header})
set_target_properties(${target_name} PROPERTIES COTIRE_ADD_UNITY_BUILD FALSE)
cotire(${target_name})
else()
# Only use pch when there are at least two source files
get_target_property(cpp_source_files ${target_name} SOURCES)
list(FILTER cpp_source_files INCLUDE REGEX ".*(\\.cpp|\\.cxx)$")
list(LENGTH cpp_source_files cpp_source_count)
if(cpp_source_count GREATER_EQUAL 2)
target_precompile_headers(${target_name} PRIVATE "$<$<COMPILE_LANGUAGE:CXX>:${prec_header}>")
endif()
get_target_property(mm_source_files ${target_name} SOURCES)
list(FILTER mm_source_files INCLUDE REGEX ".*\\.mm$")
list(LENGTH mm_source_files mm_source_count)
if(mm_source_count GREATER_EQUAL 2)
target_precompile_headers(${target_name} PRIVATE "$<$<COMPILE_LANGUAGE:OBJCXX>:${prec_header}>")
endif()
endif()
elseif(MSVC)
target_compile_definitions(${target_name} PRIVATE NOPCH)
endif()
endmacro()
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