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# - Additional help finding search paths on MinGW distributions, including MSYS2.
#
# Much of this is really more in the purview of CMake or the packages of CMake for
# those distributions, but if I can centralize/simplify the pain here, it's worth doing.
#
# Variables: (all are internal cache variables)
# MINGWSEARCH_INCLUDE_DIRS - use under PATHS in your find_path() commands
# MINGWSEARCH_LIBRARY_DIRS - use under PATHS in your find_library() commands
# MINGWSEARCH_PREFIXES - suitable for temporary use in CMAKE_FIND_ROOT_PATH or CMAKE_PREFIX_PATH.
# MINGWSEARCH_TARGET_TRIPLE - something like x86_64-w64-mingw32 or i686-w64-mingw32, use as you see fit.
#
# Original Author:
# 2016 Ryan Pavlik <ryan@sensics.com> <ryan.pavlik@gmail.com>
#
# Copyright Sensics, Inc. 2016.
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or copy at
# http://www.boost.org/LICENSE_1_0.txt)
if(MINGW AND NOT MINGWSEARCH_COMPLETED)
###
# Helper function
###
function(_mingwsearch_conditional_add _var _path)
#message(STATUS "conditional add to ${_var}: ${_path}")
if(("${_path}" MATCHES "registry") OR (NOT IS_DIRECTORY "${_path}"))
# Path invalid - do not add
return()
endif()
list(FIND ${_var} "${_path}" _idx)
if(_idx GREATER -1)
# Path already in list - do not add
return()
endif()
# Not yet in the list, so we'll add it
list(APPEND ${_var} "${_path}")
set(${_var} ${${_var}} PARENT_SCOPE)
endfunction()
# Clear the working variables.
set(MINGWSEARCH_INCLUDE_DIRS_WORK)
set(MINGWSEARCH_LIBRARY_DIRS_WORK)
set(MINGWSEARCH_PREFIXES_WORK)
set(_mingw_target_triple)
# Try to find the string like x86_64-w64-mingw32 by parsing the implicit link directories...
# TODO this is a hack that either should be resolved in CMake or in MSYS2's package of CMake.
foreach(_link_dir ${CMAKE_CXX_IMPLICIT_LINK_DIRECTORIES})
_mingwsearch_conditional_add(MINGWSEARCH_LIBRARY_DIRS_WORK "${_link_dir}")
if("${_link_dir}" MATCHES "/([^/]*-mingw32)/lib")
set(_mingw_target_triple ${CMAKE_MATCH_1})
get_filename_component(_mingw_internal_basedir "${_link_dir}" PATH)
# Try adding the parallel include dir
if(IS_DIRECTORY "${_mingw_internal_basedir}/include")
_mingwsearch_conditional_add(MINGWSEARCH_INCLUDE_DIRS_WORK "${_mingw_internal_basedir}/include")
_mingwsearch_conditional_add(MINGWSEARCH_PREFIXES_WORK "${_mingw_internal_basedir}")
endif()
if(NOT CMAKE_CROSSCOMPILING)
# Try going up a level, since the directory with the target is usually a sibling to the main prefix.
get_filename_component(_mingw_main_basedir_candidate "${_mingw_internal_basedir}/.." ABSOLUTE)
if(IS_DIRECTORY "${_mingw_main_basedir_candidate}/include" AND NOT ("${_mingw_main_basedir_candidate}" STREQUAL "${_mingw_internal_basedir}"))
# If we could go up a level, add that include dir too.
_mingwsearch_conditional_add(MINGWSEARCH_INCLUDE_DIRS_WORK "${_mingw_main_basedir_candidate}/include")
_mingwsearch_conditional_add(MINGWSEARCH_PREFIXES_WORK "${_mingw_main_basedir_candidate}")
endif()
endif()
endif()
endforeach()
###
# Output results.
###
if(MINGWSEARCH_INCLUDE_DIRS_WORK)
set(MINGWSEARCH_INCLUDE_DIRS "${MINGWSEARCH_INCLUDE_DIRS_WORK}" CACHE INTERNAL "" FORCE)
#message(STATUS "MINGWSEARCH_INCLUDE_DIRS ${MINGWSEARCH_INCLUDE_DIRS}")
endif()
if(MINGWSEARCH_LIBRARY_DIRS_WORK)
set(MINGWSEARCH_LIBRARY_DIRS "${MINGWSEARCH_LIBRARY_DIRS_WORK}" CACHE INTERNAL "" FORCE)
#message(STATUS "MINGWSEARCH_LIBRARY_DIRS ${MINGWSEARCH_LIBRARY_DIRS}")
endif()
if(MINGWSEARCH_PREFIXES_WORK)
set(MINGWSEARCH_PREFIXES "${MINGWSEARCH_PREFIXES_WORK}" CACHE INTERNAL "" FORCE)
#message(STATUS "MINGWSEARCH_PREFIXES ${MINGWSEARCH_PREFIXES}")
endif()
if(_mingw_target_triple)
set(MINGWSEARCH_TARGET_TRIPLE ${_mingw_target_triple} CACHE INTERNAL "" FORCE)
#message(STATUS "MINGWSEARCH_TARGET_TRIPLE ${MINGWSEARCH_TARGET_TRIPLE}")
endif()
set(MINGWSEARCH_COMPLETED TRUE CACHE INTERNAL "" FORCE)
endif()
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