On Thu, Nov 18, 2010 at 09:39:15AM -0600, Kevin Lewis wrote:
>Most of the code I have worked on in the past used extra '-' before
>macro variables and sometimes after. Older preprocessors did not
>enforce the scope of those variables. They used to let all variables
>take on the scope of the code they happen to be dropped into.
I am not aware of such preprocessors, and I have used various C
development environments since 1991 or so.
Could you be thinking of variables that are introduced in the macro
expansion? There are a few such variables in the InnoDB code base, in
some data structure iterators. Heikki has used the 313 suffix for them,
and the <valgrind/memcheck.h> uses the _qzz prefix, probably because it
must try harder to avoid clashes.
Some 10 years ago, I wrote a translator that generated C code. I used
the i prefix for some generated functions, which turned out to be a bad
idea: i386 was a reserved symbol in the default GCC configuration.