OpenSceneGraph/CMakeModules/FindAsio.cmake

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# Locate ASIO-headers (http://think-async.com/Asio)
# This module defines
# ASIO_FOUND, if false, do not try to link to gdal
# ASIO_INCLUDE_DIR, where to find the headers
#
# Created by Stephan Maximilian Huber
FIND_PATH(ASIO_INCLUDE_DIR
NAMES
asio.hpp
PATHS
/usr/include
/usr/local/include
)
SET(ASIO_FOUND "NO")
IF(ASIO_INCLUDE_DIR)
set(ASIO_VERSION_H ${ASIO_INCLUDE_DIR}/asio/version.hpp)
file(STRINGS ${ASIO_VERSION_H} AsioVersionLine REGEX "^#define ASIO_VERSION ")
string(REGEX MATCHALL "[0-9]+" AsioHeaderVersionMatches "${AsioVersionLine}")
list(GET AsioHeaderVersionMatches 0 AsioHeaderVersion)
# check version is less than 1.14.0 otherwise API changes break build
if (${AsioHeaderVersion} LESS "101400")
FIND_PACKAGE( Boost 1.37 )
IF(Boost_FOUND)
SET(ASIO_FOUND "YES")
ENDIF()
else()
message("ASIO not compatible")
endif()
ENDIF()