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-rw-r--r--Modules/CMakePushCheckState.cmake33
1 files changed, 28 insertions, 5 deletions
diff --git a/Modules/CMakePushCheckState.cmake b/Modules/CMakePushCheckState.cmake
index 08809bf..b37b706 100644
--- a/Modules/CMakePushCheckState.cmake
+++ b/Modules/CMakePushCheckState.cmake
@@ -1,8 +1,10 @@
-# This module defines two macros:
+# This module defines three macros:
# CMAKE_PUSH_CHECK_STATE()
-# and
# CMAKE_POP_CHECK_STATE()
-# These two macros can be used to save and restore the state of the variables
+# and
+# CMAKE_RESET_CHECK_STATE()
+# These macros can be used to save, restore and reset (i.e., clear contents)
+# the state of the variables
# CMAKE_REQUIRED_FLAGS, CMAKE_REQUIRED_DEFINITIONS, CMAKE_REQUIRED_LIBRARIES
# and CMAKE_REQUIRED_INCLUDES used by the various Check-files coming with CMake,
# like e.g. check_function_exists() etc.
@@ -11,9 +13,16 @@
# but after the Find-module has been executed they should have the same value
# as they had before.
#
+# CMAKE_PUSH_CHECK_STATE() macro receives optional argument RESET. Whether it's specified,
+# CMAKE_PUSH_CHECK_STATE() will set all CMAKE_REQUIRED_* variables to empty values, same
+# as CMAKE_RESET_CHECK_STATE() call will do.
+#
# Usage:
-# cmake_push_check_state()
-# set(CMAKE_REQUIRED_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} -DSOME_MORE_DEF)
+# cmake_push_check_state(RESET)
+# set(CMAKE_REQUIRED_DEFINITIONS -DSOME_MORE_DEF)
+# check_function_exists(...)
+# cmake_reset_check_state()
+# set(CMAKE_REQUIRED_DEFINITIONS -DANOTHER_DEF)
# check_function_exists(...)
# cmake_pop_check_state()
@@ -31,6 +40,15 @@
# License text for the above reference.)
+macro(CMAKE_RESET_CHECK_STATE)
+
+ set(CMAKE_REQUIRED_INCLUDES)
+ set(CMAKE_REQUIRED_DEFINITIONS)
+ set(CMAKE_REQUIRED_LIBRARIES)
+ set(CMAKE_REQUIRED_FLAGS)
+
+endmacro()
+
macro(CMAKE_PUSH_CHECK_STATE)
if(NOT DEFINED _CMAKE_PUSH_CHECK_STATE_COUNTER)
@@ -43,6 +61,11 @@ macro(CMAKE_PUSH_CHECK_STATE)
set(_CMAKE_REQUIRED_DEFINITIONS_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER} ${CMAKE_REQUIRED_DEFINITIONS})
set(_CMAKE_REQUIRED_LIBRARIES_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER} ${CMAKE_REQUIRED_LIBRARIES})
set(_CMAKE_REQUIRED_FLAGS_SAVE_${_CMAKE_PUSH_CHECK_STATE_COUNTER} ${CMAKE_REQUIRED_FLAGS})
+
+ if (ARGC GREATER 0 AND ARGV0 STREQUAL "RESET")
+ cmake_reset_check_state()
+ endif()
+
endmacro()
macro(CMAKE_POP_CHECK_STATE)