29 lines
724 B
Systemverilog
29 lines
724 B
Systemverilog
// IEEE1800-2017 Clause 22.5.2
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// The directive `undef shall undefine the specified text macro if previously
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// defined by a `define compiler directive within the compilation unit. An
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// attempt to undefine a text macro that was not previously defined using a
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// `define compiler directive can issue a warning.
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`undef FOO
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`undef FOO// Comment
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`undef FOO // Comment
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`define FOO foo
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`ifdef FOO
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// AAA
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// This block SHOULD be emitted from the preprocessor.
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`endif
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`ifndef FOO
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// AAA
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// This block should NOT be emitted from the preprocessor.
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`endif
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`undef FOO
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`ifdef FOO
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// BBB
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// This block should NOT be emitted from the preprocessor.
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`endif
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`ifndef FOO
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// BBB
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// This block SHOULD be emitted from the preprocessor.
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`endif
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