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# Look for the cjson library; will probably newer be found.
# If found, it sets these variables:
#
# CJSON_INCLUDE_DIRS Header file directories
# CJSON_LIBRARIES Archive/shared objects
include (FindPackageHandleStandardArgs)
if (CJSON_ROOT)
set (_no_default_path "NO_DEFAULT_PATH")
else (CJSON_ROOT)
set (_no_default_path "")
endif (CJSON_ROOT)
find_path (CJSON_INCLUDE_DIR
NAMES "cJSON.h"
HINTS "${CJSON_ROOT}"
PATH_SUFFIXES "cjson"
DOC "Path to cjson library header files"
${_no_default_path} )
# find out the size of a pointer. this is required to only search for
# libraries in the directories relevant for the architecture
if (CMAKE_SIZEOF_VOID_P)
math (EXPR _BITS "8 * ${CMAKE_SIZEOF_VOID_P}")
endif (CMAKE_SIZEOF_VOID_P)
string(REGEX REPLACE "${PROJECT_SOURCE_DIR}/?(.*)" "\\1" BUILD_DIR_SUFFIX "${PROJECT_BINARY_DIR}")
find_library (CJSON_LIBRARY
NAMES "cjson"
HINTS "${CJSON_ROOT}"
PATH_SUFFIXES "lib" "lib${_BITS}" "lib/${CMAKE_LIBRARY_ARCHITECTURE}"
DOC "Path to cjson library archive/shared object files"
${_no_default_path} )
# setup list of all required libraries to link with cjson
set (cjson_INCLUDE_DIRS ${CJSON_INCLUDE_DIR})
set (cjson_LIBRARIES ${CJSON_LIBRARY})
# math library (should exist on all unices; automatically linked on Windows)
if (UNIX)
find_library (MATH_LIBRARY NAMES "m")
list (APPEND CJSON_LIBRARIES ${MATH_LIBRARY})
endif (UNIX)
# see if we can compile a minimum example
# CMake logical test doesn't handle lists (sic)
if (NOT (CJSON_INCLUDE_DIRS MATCHES "-NOTFOUND" OR CJSON_LIBRARIES MATCHES "-NOTFOUND"))
include (CMakePushCheckState)
include (CheckCSourceCompiles)
cmake_push_check_state ()
set (CMAKE_REQUIRED_INCLUDES ${CJSON_INCLUDE_DIRS})
set (CMAKE_REQUIRED_LIBRARIES ${CJSON_LIBRARIES})
check_c_source_compiles (
"#include <stdlib.h>
#include <cjson/cJSON.h>
int main (void) {
cJSON root;
return 0;
}" HAVE_CJSON)
cmake_pop_check_state ()
else ()
# clear the cache so the find probe is attempted again if files becomes
# available (only upon a unsuccessful *compile* should we disable further
# probing)
set (HAVE_CJSON)
unset (HAVE_CJSON CACHE)
endif ()
# if the test program didn't compile, but was required to do so, bail
# out now and display an error; otherwise limp on
find_package_handle_standard_args (cjson
DEFAULT_MSG
cjson_INCLUDE_DIRS cjson_LIBRARIES HAVE_CJSON
)
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