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# - Check if the DIR symbol exists like in AC_HEADER_DIRENT.
# CHECK_DIRSYMBOL_EXISTS(FILES VARIABLE)
#
# FILES - include files to check
# VARIABLE - variable to return result
#
# This module is a small but important variation on CheckSymbolExists.cmake.
# The symbol always searched for is DIR, and the test programme follows
# the AC_HEADER_DIRENT test programme rather than the CheckSymbolExists.cmake
# test programme since that latter programme always fails when the DIR symbol
# is typedef'd rather than #define'd.
#
# The following variables may be set before calling this macro to
# modify the way the check is run:
#
# CMAKE_REQUIRED_FLAGS = string of compile command line flags
# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
# CMAKE_REQUIRED_INCLUDES = list of include directories
# CMAKE_REQUIRED_LIBRARIES = list of libraries to link
macro(CHECK_DIRSYMBOL_EXISTS FILES VARIABLE)
if(NOT DEFINED ${VARIABLE})
set(CMAKE_CONFIGURABLE_FILE_CONTENT "/* */\n")
set(MACRO_CHECK_DIRSYMBOL_EXISTS_FLAGS ${CMAKE_REQUIRED_FLAGS})
if(CMAKE_REQUIRED_LIBRARIES)
set(MACRO_CHECK_DIRSYMBOL_EXISTS_LIBS
"-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
else(CMAKE_REQUIRED_LIBRARIES)
set(MACRO_CHECK_DIRSYMBOL_EXISTS_LIBS)
endif(CMAKE_REQUIRED_LIBRARIES)
if(CMAKE_REQUIRED_INCLUDES)
set(MACRO_CHECK_DIRSYMBOL_EXISTS_INCLUDES
"-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
else(CMAKE_REQUIRED_INCLUDES)
set(MACRO_CHECK_DIRSYMBOL_EXISTS_INCLUDES)
endif(CMAKE_REQUIRED_INCLUDES)
foreach(FILE ${FILES})
set(CMAKE_CONFIGURABLE_FILE_CONTENT
"${CMAKE_CONFIGURABLE_FILE_CONTENT}#include <${FILE}>\n")
endforeach(FILE)
set(CMAKE_CONFIGURABLE_FILE_CONTENT
"${CMAKE_CONFIGURABLE_FILE_CONTENT}\nint main()\n{if ((DIR *) 0) return 0;}\n")
configure_file("${CMAKE_ROOT}/Modules/CMakeConfigurableFile.in"
"${CMAKE_BINARY_DIR}/CMakeFiles/CMakeTmp/CheckDIRSymbolExists.c" @ONLY)
message(STATUS "Looking for DIR symbol in ${FILES}")
try_compile(${VARIABLE}
${CMAKE_BINARY_DIR}
${CMAKE_BINARY_DIR}/CMakeFiles/CMakeTmp/CheckDIRSymbolExists.c
COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
CMAKE_FLAGS
-DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_DIRSYMBOL_EXISTS_FLAGS}
"${MACRO_CHECK_DIRSYMBOL_EXISTS_LIBS}"
"${MACRO_CHECK_DIRSYMBOL_EXISTS_INCLUDES}"
OUTPUT_VARIABLE OUTPUT)
if(${VARIABLE})
message(STATUS "Looking for DIR symbol in ${FILES} - found")
set(${VARIABLE} 1 CACHE INTERNAL "Have symbol DIR")
file(APPEND ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeOutput.log
"Determining if the DIR symbol is defined as in AC_HEADER_DIRENT "
"passed with the following output:\n"
"${OUTPUT}\nFile ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeTmp/CheckDIRSymbolExists.c:\n"
"${CMAKE_CONFIGURABLE_FILE_CONTENT}\n")
else(${VARIABLE})
message(STATUS "Looking for DIR symbol in ${FILES} - not found.")
set(${VARIABLE} "" CACHE INTERNAL "Have symbol DIR")
file(APPEND ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeError.log
"Determining if the DIR symbol is defined as in AC_HEADER_DIRENT "
"failed with the following output:\n"
"${OUTPUT}\nFile ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeTmp/CheckDIRSymbolExists.c:\n"
"${CMAKE_CONFIGURABLE_FILE_CONTENT}\n")
endif(${VARIABLE})
endif(NOT DEFINED ${VARIABLE})
endmacro(CHECK_DIRSYMBOL_EXISTS)
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