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CMake: only do jpeg-turbo tests if a libjpeg was found

pull/3/head
Christian Beier 4 years ago
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commit
77dce5b6af
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  1. 68
      CMakeLists.txt

68
CMakeLists.txt

@ -58,39 +58,41 @@ endif(WITH_ZLIB)
if(WITH_JPEG)
find_package(JPEG)
# Check whether the version of libjpeg we found was libjpeg-turbo and print a
# warning if not.
set(CMAKE_REQUIRED_LIBRARIES ${JPEG_LIBRARIES})
set(CMAKE_REQUIRED_FLAGS -I${JPEG_INCLUDE_DIR})
set(JPEG_TEST_SOURCE "\n
#include <stdio.h>\n
#include <jpeglib.h>\n
int main(void) {\n
struct jpeg_compress_struct cinfo;\n
struct jpeg_error_mgr jerr;\n
cinfo.err=jpeg_std_error(&jerr);\n
jpeg_create_compress(&cinfo);\n
cinfo.input_components = 3;\n
jpeg_set_defaults(&cinfo);\n
cinfo.in_color_space = JCS_EXT_RGB;\n
jpeg_default_colorspace(&cinfo);\n
return 0;\n
}")
if(CMAKE_CROSSCOMPILING)
check_c_source_compiles("${JPEG_TEST_SOURCE}" FOUND_LIBJPEG_TURBO)
else()
check_c_source_runs("${JPEG_TEST_SOURCE}" FOUND_LIBJPEG_TURBO)
endif()
set(CMAKE_REQUIRED_LIBRARIES)
set(CMAKE_REQUIRED_FLAGS)
set(CMAKE_REQUIRED_DEFINITIONS)
if(NOT FOUND_LIBJPEG_TURBO)
message(WARNING "*** The libjpeg library you are building against is not libjpeg-turbo. Performance will be reduced. You can obtain libjpeg-turbo from: https://sourceforge.net/projects/libjpeg-turbo/files/ ***")
endif()
if(JPEG_FOUND)
# Check whether the version of libjpeg we found was libjpeg-turbo and print a
# warning if not.
set(CMAKE_REQUIRED_LIBRARIES ${JPEG_LIBRARIES})
set(CMAKE_REQUIRED_FLAGS -I${JPEG_INCLUDE_DIR})
set(JPEG_TEST_SOURCE "\n
#include <stdio.h>\n
#include <jpeglib.h>\n
int main(void) {\n
struct jpeg_compress_struct cinfo;\n
struct jpeg_error_mgr jerr;\n
cinfo.err=jpeg_std_error(&jerr);\n
jpeg_create_compress(&cinfo);\n
cinfo.input_components = 3;\n
jpeg_set_defaults(&cinfo);\n
cinfo.in_color_space = JCS_EXT_RGB;\n
jpeg_default_colorspace(&cinfo);\n
return 0;\n
}")
if(CMAKE_CROSSCOMPILING)
check_c_source_compiles("${JPEG_TEST_SOURCE}" FOUND_LIBJPEG_TURBO)
else()
check_c_source_runs("${JPEG_TEST_SOURCE}" FOUND_LIBJPEG_TURBO)
endif()
set(CMAKE_REQUIRED_LIBRARIES)
set(CMAKE_REQUIRED_FLAGS)
set(CMAKE_REQUIRED_DEFINITIONS)
if(NOT FOUND_LIBJPEG_TURBO)
message(WARNING "*** The libjpeg library you are building against is not libjpeg-turbo. Performance will be reduced. You can obtain libjpeg-turbo from: https://sourceforge.net/projects/libjpeg-turbo/files/ ***")
endif()
endif(JPEG_FOUND)
endif(WITH_JPEG)

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