[racket-dev] [plt] Push #23267: master branch updated

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On 08/16/11 20:54, Stephen Bloch wrote:
> Wouldn't it be even better to put curly-braces around the body of the
> C macro, so people using it don't have to know that it expands into
> multiple statements?

I read a long time ago (I think it was on LWN, but I can't find the
article) about some tricks that are used in the linux kernel to mitigate
weaknesses of the C preprocessor. You wrap multiple statement macros in
"do {" "} while(0)", so that you don't have to think about whether you
need curly braces and it will absorb (and need) a semicolon, so that it
won't break your if-statements. You can read more about it here:

https://www.securecoding.cert.org/confluence/display/seccode/PRE10-C.+Wrap+multi-statement+macros+in+a+do-while+loop

HTH,

Marijn

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