Adding some CMake modules from KDE, since the original versions are buggy

[quassel.git] / cmake / modules / MacroPushRequiredVars.cmake

diff --git a/cmake/modules/MacroPushRequiredVars.cmake b/cmake/modules/MacroPushRequiredVars.cmake
new file mode 100644 (file)
index 0000000..650b566
--- /dev/null
+++ b/cmake/modules/MacroPushRequiredVars.cmake
@@ -0,0 +1,47 @@
+# this module defines two macros:
+# MACRO_PUSH_REQUIRED_VARS()
+# and
+# MACRO_POP_REQUIRED_VARS()
+# use these if you call cmake macros which use
+# any of the CMAKE_REQUIRED_XXX variables
+#
+# Usage:
+# MACRO_PUSH_REQUIRED_VARS()
+# SET(CMAKE_REQUIRED_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} -DSOME_MORE_DEF)
+# CHECK_FUNCTION_EXISTS(...)
+# MACRO_POP_REQUIRED_VARS()
+
+# Copyright (c) 2006, Alexander Neundorf, <neundorf@kde.org>
+#
+# Redistribution and use is allowed according to the terms of the BSD license.
+# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
+
+MACRO(MACRO_PUSH_REQUIRED_VARS)
+
+   IF(NOT DEFINED _PUSH_REQUIRED_VARS_COUNTER)
+      SET(_PUSH_REQUIRED_VARS_COUNTER 0)
+   ENDIF(NOT DEFINED _PUSH_REQUIRED_VARS_COUNTER)
+
+   MATH(EXPR _PUSH_REQUIRED_VARS_COUNTER "${_PUSH_REQUIRED_VARS_COUNTER}+1")
+
+   SET(_CMAKE_REQUIRED_INCLUDES_SAVE_${_PUSH_REQUIRED_VARS_COUNTER}    ${CMAKE_REQUIRED_INCLUDES})
+   SET(_CMAKE_REQUIRED_DEFINITIONS_SAVE_${_PUSH_REQUIRED_VARS_COUNTER} ${CMAKE_REQUIRED_DEFINITIONS})
+   SET(_CMAKE_REQUIRED_LIBRARIES_SAVE_${_PUSH_REQUIRED_VARS_COUNTER}   ${CMAKE_REQUIRED_LIBRARIES})
+   SET(_CMAKE_REQUIRED_FLAGS_SAVE_${_PUSH_REQUIRED_VARS_COUNTER}       ${CMAKE_REQUIRED_FLAGS})
+ENDMACRO(MACRO_PUSH_REQUIRED_VARS)
+
+MACRO(MACRO_POP_REQUIRED_VARS)
+
+# don't pop more than we pushed
+   IF("${_PUSH_REQUIRED_VARS_COUNTER}" GREATER "0")
+
+      SET(CMAKE_REQUIRED_INCLUDES    ${_CMAKE_REQUIRED_INCLUDES_SAVE_${_PUSH_REQUIRED_VARS_COUNTER}})
+      SET(CMAKE_REQUIRED_DEFINITIONS ${_CMAKE_REQUIRED_DEFINITIONS_SAVE_${_PUSH_REQUIRED_VARS_COUNTER}})
+      SET(CMAKE_REQUIRED_LIBRARIES   ${_CMAKE_REQUIRED_LIBRARIES_SAVE_${_PUSH_REQUIRED_VARS_COUNTER}})
+      SET(CMAKE_REQUIRED_FLAGS       ${_CMAKE_REQUIRED_FLAGS_SAVE_${_PUSH_REQUIRED_VARS_COUNTER}})
+
+      MATH(EXPR _PUSH_REQUIRED_VARS_COUNTER "${_PUSH_REQUIRED_VARS_COUNTER}-1")
+   ENDIF("${_PUSH_REQUIRED_VARS_COUNTER}" GREATER "0")
+
+ENDMACRO(MACRO_POP_REQUIRED_VARS)
+