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define extensions

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llvm-svn: 38983
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Chris Lattner 2006-10-14 19:53:48 +00:00
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commit 58360339bd
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clang/NOTES.txt
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@ -1,3 +1,28 @@
//===---------------------------------------------------------------------===//
// Random Notes
//===---------------------------------------------------------------------===//
//===---------------------------------------------------------------------===//
Extensions:
* "#define_target X Y"
This preprocessor directive works exactly the same was as #define, but it
notes that 'X' is a target-specific preprocessor directive. When used, a
diagnostic is emitted indicating that the translation unit is non-portable.
If a target-define is #undef'd before use, no diagnostic is emitted. If 'X'
were previously a normal #define macro, the macro is tainted. If 'X' is
subsequently #defined as a non-target-specific define, the taint bit is
cleared.
* "#define_other_target X"
The preprocessor directive takes a single identifier argument. It notes
that this identifier is a target-specific #define for some target other than
the current one. Use of this identifier will result in a diagnostic.
If 'X' is later #undef'd or #define'd, the taint bit is cleared. If 'X' is
already defined, X is marked as a target-specific define.
//===---------------------------------------------------------------------===//