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| author | Nick Mathewson <nickm@torproject.org> | 2016-05-27 11:23:52 -0400 |
|---|---|---|
| committer | Nick Mathewson <nickm@torproject.org> | 2016-05-27 11:23:52 -0400 |
| commit | 0279e4847352111254503159685487e5e1f58681 (patch) | |
| tree | ba6145abf0a24f9e6268673cabd6b72cd2fdd90c /src/common/compat.h | |
| parent | a0dd8360983e8df41424694f4708ffa6f03f65a1 (diff) | |
| download | tor-0279e4847352111254503159685487e5e1f58681.tar.gz tor-0279e4847352111254503159685487e5e1f58681.zip | |
Add support for temporarily suppressing a warning
There are a few places where we want to disable a warning: for
example, when it's impossible to call a legacy API without
triggering it, or when it's impossible to include an external header
without triggering it.
This pile of macros uses GCC's c99 _Pragma support, plus the usual
macro trickery, to enable and disable warnings.
Diffstat (limited to 'src/common/compat.h')
| -rw-r--r-- | src/common/compat.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/src/common/compat.h b/src/common/compat.h index b6ee4106db..6f102becc2 100644 --- a/src/common/compat.h +++ b/src/common/compat.h @@ -82,6 +82,44 @@ #define CHECK_SCANF(formatIdx, firstArg) #endif +/* What GCC do we have? */ +#ifdef __GNUC__ +#define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__) +#else +#define GCC_VERSION 0 +#endif + +/* Temporarily enable and disable warnings. */ +#ifdef __GNUC__ +# define PRAGMA_STRINGIFY_(s) #s +# define PRAGMA_JOIN_STRINGIFY_(a,b) PRAGMA_STRINGIFY_(a ## b) +/* Support for macro-generated pragmas (c99) */ +# define PRAGMA_(x) _Pragma (#x) +# ifdef __clang__ +# define PRAGMA_DIAGNOSTIC_(x) PRAGMA_(clang diagnostic x) +# else +# define PRAGMA_DIAGNOSTIC_(x) PRAGMA_(GCC diagnostic x) +# endif +# if defined(__clang__) || GCC_VERSION >= 406 +/* we have push/pop support */ +# define DISABLE_GCC_WARNING(warning) \ + PRAGMA_DIAGNOSTIC_(push) \ + PRAGMA_DIAGNOSTIC_(ignored PRAGMA_JOIN_STRINGIFY_(-W,warning)) +# define ENABLE_GCC_WARNING(warning) \ + PRAGMA_DIAGNOSTIC_(pop) +# else +/* older version of gcc: no push/pop support. */ +# define DISABLE_GCC_WARNING(warning) \ + PRAGMA_DIAGNOSTIC_(ignored PRAGMA_JOIN_STRINGIFY_(-W,warning)) +# define ENABLE_GCC_WARNING(warning) \ + PRAGMA_DIAGNOSTIC_(warning PRAGMA_JOIN_STRINGIFY_(-W,warning)) +# endif +#else /* ifdef __GNUC__ */ +/* not gcc at all */ +# define DISABLE_GCC_WARNING(warning) +# define ENABLE_GCC_WARNING(warning) +#endif + /* inline is __inline on windows. */ #ifdef _WIN32 #define inline __inline |