Ping.<br><div><br><div class="gmail_quote">On Thu, Oct 25, 2012 at 1:39 PM, Lang Hames <span dir="ltr"><<a href="mailto:lhames@gmail.com" target="_blank">lhames@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi All,
<div><br></div><div>Tim Northover pointed out that there's a flaw in my recent FP_CONTRACT patch (r166383). That patch restricted FP_CONTRACT (or rather tok::annot_pragma_fp_contract) to appearing as the first token in a compound statement. The problem with my patch is that it prohibits things like:</div>
<div><br></div><div><font face="courier new, monospace">void foo() {</font></div><div><font face="courier new, monospace"> #pragma MS_STRUCT ON</font></div><div><font face="courier new, monospace"> #pragma STDC FP_CONTRACT ON</font></div>
<div><font face="courier new, monospace"> // ...</font></div><div><font face="courier new, monospace">}</font></div><div><br></div><div>Which isn't prohibited by the C99 spec, and I think seems reasonable.</div><div>
<br></div><div>A simple solution to the problem is to loop at the start of a compound statement parsing tokens that can reasonably appear there (FP_CONTRACT, MS_STRUCT, maybe others?), then break out of that look when an unhandled token encountered. Attached is a patch that implements this approach, processing FP_CONTRACT and MS_STRUCT pragmas at the start of compound statements before falling through.</div>
<div><br></div><div>Not being a language lawyer, is what else should be handled in this loop? </div><div><br></div><div>Does this seem like a reasonable approach?</div><span><font color="#888888"><div><br>
</div><div>- Lang.</div><div><br></div>
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