[Patch] Silence some compiler warnings.

[Andrew Haley]

Tom Tromey writes:
 > >>>>> "David" == David Daney <ddaney@avtrex.com> writes:
 > 
 > David> Some of the C++ files that make up libgcj are generating compiler
 > David> warnings.  This patch silences them, and also removes a dead union
 > David> definition that I encountered along the way.
 > David> Tested on x86_64-pc-linux-gnu with no regressions.
 > 
 > David> OK to commit?
 > 
 > Yes, thanks.  One little note...
 > 
 > David> -    while (! compare_and_swap (&lock, 0, 1));
 > David> +    while (! compare_and_swap (&lock, 0, 1)) ;
 > 
 > In cases like this I prefer the ';' on its own line, to emphasize the
 > loop's emptiness.  Call it "Sartre style".

What is this for?  Is it a GNU coding convention, or what?

Andrew.