diff options
Diffstat (limited to 'Modules/CheckVariableExists.cmake')
| -rw-r--r-- | Modules/CheckVariableExists.cmake | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/Modules/CheckVariableExists.cmake b/Modules/CheckVariableExists.cmake new file mode 100644 index 0000000..daa87a0 --- /dev/null +++ b/Modules/CheckVariableExists.cmake @@ -0,0 +1,23 @@ +# +# Check if the variable exists. +# # CHECK_VARIABLE_EXISTS - macro which checks if the variable exists +# VAR - the name of the variable +# VARIABLE - variable to store the result +# + +MACRO(CHECK_VARIABLE_EXISTS VAR VARIABLE) + SET(MACRO_CHECK_VARIABLE_DEFINITIONS -DCHECK_VARIABLE_EXISTS=${VAR}) + TRY_COMPILE(${VARIABLE} + ${PROJECT_BINARY_DIR} + ${CMAKE_ROOT}/Modules/CheckVariableExists.c + CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_VARIABLE_DEFINITIONS} + OUTPUT_VARIABLE OUTPUT) + IF(${VARIABLE}) + SET(${VARIABLE} 1 CACHE INTERNAL "Have variable ${VAR}") + ELSE(${VARIABLE}) + SET(${VARIABLE} "" CACHE INTERNAL "Have variable ${VAR}") + WRITE_FILE(${PROJECT_BINARY_DIR}/CMakeError.log + "Determining if the variable ${VAR} exists failed with the following output:\n" + "${OUTPUT}\n" APPEND) + ENDIF(${VARIABLE}) +ENDMACRO(CHECK_VARIABLE_EXISTS) |