diff options
Diffstat (limited to 'include/llvm/Support/Compiler.h')
| -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 9ff78173c9..014e801282 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 |