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Add a comment about ATTRIBUTE_UNUSED to avoid further confusion over when to

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use it.

llvm-svn: 116920
This commit is contained in:
Chandler Carruth 2010-10-20 08:44:27 +00:00
parent 55850cad48
commit 7763c845be
1 changed files with 8 additions and 0 deletions
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8
include/llvm/Support/Compiler.h
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@ -31,6 +31,14 @@
#define ATTRIBUTE_USED
#endif
// Some compilers warn about unused functions. When a function is sometimes
// used or not depending on build settings (e.g. a function only called from
// within "assert"), this attribute can be used to suppress such warnings.
//
// However, it shouldn't be used for unused *variables*, as those have a much
// more portable solution:
// (void)unused_var_name;
// Prefer cast-to-void wherever it is sufficient.
#if (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1))
#define ATTRIBUTE_UNUSED __attribute__((__unused__))
#else