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authorBrad King <brad.king@kitware.com>2006-02-10 00:23:18 (GMT)
committerBrad King <brad.king@kitware.com>2006-02-10 00:23:18 (GMT)
commitf0a1da00c1d46bd3ffd0e1f4cfd76a3bbf2a2155 (patch)
tree2cbfbb98abe5416da719d9960563efbd7419bc8f /Modules/CheckVariableExists.cmake
parentf8a8e88a081600e8f6bbad8172f77fb4f422b5cd (diff)
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ENH: Made Check* modules more consistent and well documented. Added CMAKE_REQUIRED_DEFINITIONS option.
Diffstat (limited to 'Modules/CheckVariableExists.cmake')
-rw-r--r--Modules/CheckVariableExists.cmake16
1 files changed, 12 insertions, 4 deletions
diff --git a/Modules/CheckVariableExists.cmake b/Modules/CheckVariableExists.cmake
index 97413f4..2b0bdab 100644
--- a/Modules/CheckVariableExists.cmake
+++ b/Modules/CheckVariableExists.cmake
@@ -3,23 +3,31 @@
#
# VAR - the name of the variable
# VARIABLE - variable to store the result
-# If CMAKE_REQUIRED_FLAGS is set then those flags will be passed into the
-# compile of the program likewise if CMAKE_REQUIRED_LIBRARIES is set then
-# those libraries will be linked against the test program.
+#
# This macro is only for C variables.
#
+# 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_LIBRARIES = list of libraries to link
+
MACRO(CHECK_VARIABLE_EXISTS VAR VARIABLE)
IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
SET(MACRO_CHECK_VARIABLE_DEFINITIONS
"-DCHECK_VARIABLE_EXISTS=${VAR} ${CMAKE_REQUIRED_FLAGS}")
MESSAGE(STATUS "Looking for ${VAR}")
IF(CMAKE_REQUIRED_LIBRARIES)
- SET(CHECK_VARIABLE_EXISTS_ADD_LIBRARIES
+ SET(CHECK_VARIABLE_EXISTS_ADD_LIBRARIES
"-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
+ ELSE(CMAKE_REQUIRED_LIBRARIES)
+ SET(CHECK_VARIABLE_EXISTS_ADD_LIBRARIES)
ENDIF(CMAKE_REQUIRED_LIBRARIES)
TRY_COMPILE(${VARIABLE}
${CMAKE_BINARY_DIR}
${CMAKE_ROOT}/Modules/CheckVariableExists.c
+ COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_VARIABLE_DEFINITIONS}
"${CHECK_VARIABLE_EXISTS_ADD_LIBRARIES}"
OUTPUT_VARIABLE OUTPUT)