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authorAndy Cedilnik <andy.cedilnik@kitware.com>2003-01-13 03:28:32 (GMT)
committerAndy Cedilnik <andy.cedilnik@kitware.com>2003-01-13 03:28:32 (GMT)
commitd87595ede3d958fbece3eedcc312d1e429c7ae10 (patch)
treeb7edbbd5a8f5609460e819751432c7913bdd217e /Modules/CheckSymbolExists.cmake
parent8c7456f970d56ea11de6a2fe3fe81b4b3b174993 (diff)
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Add macro for checking if symbol exists
Diffstat (limited to 'Modules/CheckSymbolExists.cmake')
-rw-r--r--Modules/CheckSymbolExists.cmake47
1 files changed, 47 insertions, 0 deletions
diff --git a/Modules/CheckSymbolExists.cmake b/Modules/CheckSymbolExists.cmake
new file mode 100644
index 0000000..5f62738
--- /dev/null
+++ b/Modules/CheckSymbolExists.cmake
@@ -0,0 +1,47 @@
+#
+# Check if the symbol exists in include files
+#
+# CHECK_SYMBOL_EXISTS - macro which checks the symbol exists in include files.
+# SYMBOL - symbol
+# FILES - include files to check
+# VARIABLE - variable to return result
+#
+
+MACRO(CHECK_SYMBOL_EXISTS SYMBOL FILES VARIABLE)
+ IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
+ SET(CHECK_SYMBOL_EXISTS_CONTENT "/* */\n")
+ SET(MACRO_CHECK_SYMBOL_EXISTS_FLAGS ${CMAKE_REQUIRED_FLAGS})
+ STRING(ASCII 35 POUND)
+ STRING(ASCII 40 OPEN_PARENT)
+ STRING(ASCII 41 CLOSE_PARENT)
+ SET(PARENTS "${OPEN_PARENT}${CLOSE_PARENT}")
+ FOREACH(FILE ${FILES})
+ SET(CHECK_SYMBOL_EXISTS_CONTENT
+ "${CHECK_SYMBOL_EXISTS_CONTENT}${POUND}include <${FILE}>\n")
+ ENDFOREACH(FILE)
+ SET(CHECK_SYMBOL_EXISTS_CONTENT
+ "${CHECK_SYMBOL_EXISTS_CONTENT}\n\nvoid main${PARENTS}{"
+ "\n${POUND}ifndef ${SYMBOL}\nchar ${OPEN_PARENT}*f${CLOSE_PARENT} ${PARENTS} = ${SYMBOL};\n${POUND}endif\nreturn 0;\n}\n")
+ WRITE_FILE(${CMAKE_BINARY_DIR}/CMakeTmp/CheckSymbolExists.c
+ "${CHECK_SYMBOL_EXISTS_CONTENT}")
+
+ MESSAGE(STATUS "Looking for ${SYMBOL} in ${FILES}")
+ TRY_COMPILE(${VARIABLE}
+ ${CMAKE_BINARY_DIR}
+ ${CMAKE_BINARY_DIR}/CMakeTmp/CheckSymbolExists.c
+ CMAKE_FLAGS
+ -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_SYMBOL_EXISTS_FLAGS}
+ OUTPUT_VARIABLE OUTPUT)
+ IF(${VARIABLE})
+ MESSAGE(STATUS "Looking for ${SYMBOL} in ${FILES} - found")
+ SET(${VARIABLE} 1 CACHE INTERNAL "Have symbol ${SYMBOL}")
+ ELSE(${VARIABLE})
+ MESSAGE(STATUS "Looking for ${SYMBOL} in ${FILES} - not found.")
+ SET(${VARIABLE} "" CACHE INTERNAL "Have symbol ${SYMBOL}")
+ WRITE_FILE(${CMAKE_BINARY_DIR}/CMakeError.log
+ "Determining if the ${SYMBOL} "
+ "exist failed with the following output:\n"
+ "${OUTPUT}\n" APPEND)
+ ENDIF(${VARIABLE})
+ ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$")
+ENDMACRO(CHECK_SYMBOL_EXISTS)