Commit 4e66ef8f authored by Andy Cedilnik's avatar Andy Cedilnik
Browse files

New design of CheckSymbolExists pretty much replaces all other ones.

For example:

CHECK_HEADER_EXISTS("type.h" HAVE_TYPE_H)
is:
CHECK_SYMBOL_EXISTS(main "type.h" HAVE_TYPE_H)

CHECK_LIBRARY_EXISTS("nsl"    gethostname  HAVE_LIBNSL)
would be
SET(CMAKE_REQUIRED_LIBRARIES "nsl")
CHECK_SYMBOL_EXISTS(gethostname "netdb.h" HAVE_LIBNSL)

...
parent 25dd2010
......@@ -15,27 +15,38 @@ MACRO(CHECK_SYMBOL_EXISTS SYMBOL FILES VARIABLE)
STRING(ASCII 40 OPEN_PARENT)
STRING(ASCII 41 CLOSE_PARENT)
SET(PARENTS "${OPEN_PARENT}${CLOSE_PARENT}")
IF(CMAKE_REQUIRED_LIBRARIES)
SET(CHECK_SYMBOL_EXISTS_LIBS
"-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
ENDIF(CMAKE_REQUIRED_LIBRARIES)
FOREACH(FILE ${FILES})
SET(CHECK_SYMBOL_EXISTS_CONTENT
"${CHECK_SYMBOL_EXISTS_CONTENT}${POUND}include <${FILE}>\n")
ENDFOREACH(FILE)
SET(CHECK_SYMBOL_EXISTS_CONTENT
"${CHECK_SYMBOL_EXISTS_CONTENT}\n\nint main${PARENTS}{\n${POUND}ifndef ${SYMBOL}\nchar ${OPEN_PARENT}*f${CLOSE_PARENT} ${PARENTS} = ${SYMBOL};\n${POUND}endif\nreturn 0;\n}\n")
"${CHECK_SYMBOL_EXISTS_CONTENT}\nvoid cmakeRequireSymbol${OPEN_PARENT}int dummy,...${CLOSE_PARENT}{${OPEN_PARENT}void${CLOSE_PARENT}dummy;}\nint main${PARENTS}\n{\n${POUND}ifndef ${SYMBOL}\n cmakeRequireSymbol${OPEN_PARENT}0,&${SYMBOL}${CLOSE_PARENT};\n${POUND}endif\n return 0;\n}\n")
WRITE_FILE(${CMAKE_BINARY_DIR}/CMakeTmp/CheckSymbolExists.c
"${CHECK_SYMBOL_EXISTS_CONTENT}")
MESSAGE(STATUS "Looking for ${SYMBOL} in ${FILES}")
MESSAGE(STATUS "Looking for ${SYMBOL}")
TRY_COMPILE(${VARIABLE}
${CMAKE_BINARY_DIR}
${CMAKE_BINARY_DIR}/CMakeTmp/CheckSymbolExists.c
CMAKE_FLAGS
-DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_SYMBOL_EXISTS_FLAGS}
"${CHECK_SYMBOL_EXISTS_LIBS}"
OUTPUT_VARIABLE OUTPUT)
IF(${VARIABLE})
MESSAGE(STATUS "Looking for ${SYMBOL} in ${FILES} - found")
MESSAGE(STATUS "Looking for ${SYMBOL} - found")
SET(${VARIABLE} 1 CACHE INTERNAL "Have symbol ${SYMBOL}")
WRITE_FILE(${CMAKE_BINARY_DIR}/CMakeOutput.log
"Determining if the ${SYMBOL} "
"exist passed with the following output:\n"
"${OUTPUT}\nFile ${CMAKE_BINARY_DIR}/CMakeTmp/CheckSymbolExists.c:\n"
"${CHECK_SYMBOL_EXISTS_CONTENT}" APPEND)
ELSE(${VARIABLE})
MESSAGE(STATUS "Looking for ${SYMBOL} in ${FILES} - not found.")
MESSAGE(STATUS "Looking for ${SYMBOL} - not found.")
SET(${VARIABLE} "" CACHE INTERNAL "Have symbol ${SYMBOL}")
WRITE_FILE(${CMAKE_BINARY_DIR}/CMakeError.log
"Determining if the ${SYMBOL} "
......
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