[cfe-commits] [PATCH] Suppress -Wunused-value for explicit casts in macros

[Matt Beaumont-Gay]

The motivating case here is that OpenSSL has some code like this:

static long bio_ctrl(BIO *bio, int cmd, long num, void *ptr);
...
#define BIO_flush(b) (int)BIO_ctrl(b,BIO_CTRL_FLUSH,0,NULL)

That cast to int causes client code which calls BIO_flush and ignores
the result to get a -Wunused-value warning.

-Matt
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