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33e865c041
This introduces the unset() command to make it easy to unset CMake variables, environment variables, and CMake cache variables. Previously it was not even possible to unset ENV or CACHE variables (as in completely remove them). Changes based on patch from Philip Lowman. See issue #7507.
41 lines
781 B
CMake
41 lines
781 B
CMake
project(Unset)
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# Local variable
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set(x 42)
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if(NOT x EQUAL 42)
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message(FATAL_ERROR "x!=42")
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endif(NOT x EQUAL 42)
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if(NOT DEFINED x)
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message(FATAL_ERROR "x should be defined!")
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endif(NOT DEFINED x)
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unset(x)
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if(DEFINED x)
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message(FATAL_ERROR "x should be undefined now!")
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endif(DEFINED x)
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# Local variable test unset via set()
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set(x 43)
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if(NOT x EQUAL 43)
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message(FATAL_ERROR "x!=43")
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endif(NOT x EQUAL 43)
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set(x)
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if(DEFINED x)
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message(FATAL_ERROR "x should be undefined now!")
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endif(DEFINED x)
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# Cache variable
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set(BAR "test" CACHE STRING "documentation")
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if(NOT DEFINED BAR)
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message(FATAL_ERROR "BAR not defined")
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endif(NOT DEFINED BAR)
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unset(BAR CACHE)
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if(DEFINED BAR)
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message(FATAL_ERROR "BAR still defined")
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endif(DEFINED BAR)
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add_executable(Unset unset.cc)
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