cmake/modules/MacroJPEG.cmake

0001 # A macro wrapper to find JPEG library version
0002 #
0003 # Syntax: DETECT_JPEG()
0004 # JPEG_LIB_VERSION is set to version ID depending of libjpeg version detected.
0005 #
0006 # SPDX-FileCopyrightText: 2010-2014 Gilles Caulier <caulier dot gilles at gmail dot com>
0007 #
0008 # SPDX-License-Identifier: BSD-3-Clause
0009 #
0010 # check version of libjpeg so that we can use the appropriate dir
0011 # See bug #227313 for details
0012
0013 function(CompileToCheckVersion LibId Ret)
0014
0015     set(_jpeglib_version_source "
0016     #include <stddef.h>
0017     #include <stdio.h>
0018     #include <jpeglib.h>
0019     int main()
0020     {
0021     #if (JPEG_LIB_VERSION >= ${LibId})
0022     #error JPEG_LIB_VERSION >= ${LibId}
0023     #endif
0024     }
0025     ")
0026
0027     set(_jpeglib_version_source_file ${CMAKE_BINARY_DIR}/CMakeTmp/cmake_jpeglib_version_check.cpp)
0028     file(WRITE "${_jpeglib_version_source_file}" "${_jpeglib_version_source}")
0029     set(_jpeglib_version_include_dirs "-DINCLUDE_DIRECTORIES:STRING=${JPEG_INCLUDE_DIR}")
0030
0031     try_compile(_jpeglib_version_compile_result ${CMAKE_BINARY_DIR} ${_jpeglib_version_source_file}
0032                 CMAKE_FLAGS "${_jpeglib_version_include_dirs}"
0033                 COMPILE_OUTPUT_VARIABLE _jpeglib_version_compile_output_var)
0034
0035     set(${Ret} ${_jpeglib_version_compile_result} PARENT_SCOPE)
0036
0037 endfunction()
0038
0039 macro(DETECT_JPEG)
0040
0041     find_package(JPEG REQUIRED)
0042
0043     if(JPEG_FOUND)
0044
0045         CompileToCheckVersion(90 _CompileResult)
0046
0047         if(_CompileResult)
0048
0049             # Compile successfully. It's not libjpeg 90. We check previous version.
0050
0051             CompileToCheckVersion(80 _CompileResult)
0052
0053             if(_CompileResult)
0054
0055                 # Compile successfully. It's not libjpeg 90. We check previous version.
0056
0057                 CompileToCheckVersion(70 _CompileResult)
0058
0059                 if(_CompileResult)
0060
0061                     # Compile successfully. It's not libjpeg 70.
0062                     set(JPEG_LIB_VERSION 62)
0063
0064                 else()
0065
0066                     set(JPEG_LIB_VERSION 70)
0067
0068                 endif()
0069
0070             else()
0071
0072                 set(JPEG_LIB_VERSION 84)
0073
0074             endif()
0075
0076         else()
0077
0078             set(JPEG_LIB_VERSION 91)
0079
0080         endif()
0081
0082         message(STATUS "Libjpeg version: ${JPEG_LIB_VERSION}")
0083
0084     endif()
0085
0086 endmacro()