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| author | Chandler Carruth <chandlerc@gmail.com> | 2010-10-20 08:44:27 +0000 |
|---|---|---|
| committer | Chandler Carruth <chandlerc@gmail.com> | 2010-10-20 08:44:27 +0000 |
| commit | 7283da51b8860ca9af4cb5ca082f7bcca3894d99 (patch) | |
| tree | 954a09053d7887a821853980ea80257bfa842fb6 /include | |
| parent | 1cd9708f5cc13995a4e84ef498e4162a47f8b4f5 (diff) | |
| download | external_llvm-7283da51b8860ca9af4cb5ca082f7bcca3894d99.zip external_llvm-7283da51b8860ca9af4cb5ca082f7bcca3894d99.tar.gz external_llvm-7283da51b8860ca9af4cb5ca082f7bcca3894d99.tar.bz2 | |
Add a comment about ATTRIBUTE_UNUSED to avoid further confusion over when to
use it.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116920 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include')
| -rw-r--r-- | include/llvm/Support/Compiler.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/llvm/Support/Compiler.h b/include/llvm/Support/Compiler.h index 9ff7817..014e801 100644 --- a/include/llvm/Support/Compiler.h +++ b/include/llvm/Support/Compiler.h @@ -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 |