> On Aug 4, 2015, at 12:19 PM, Ed Schouten <e...@nuxi.nl> wrote: > > 2015-07-31 8:21 GMT+02:00 Bruce Evans <b...@optusnet.com.au>: >> For gcc before 4.6, >> the ifdef reduces to using __COUNTER__ as the second variable if >> __COUNTER__ is supported, else nothing. So for the undocumented >> subset of compilers that support __COUNTER__ all cases work, and >> for the complementary subset no cases work (the macro is null). > > I was wondering: could we solve this by not using a typedef, but an > external declaration: > > extern int __whatever[expr ? 1 : -1]; > > I think we can safely repeat this multiple times without triggering > any compiler errors.
There’s at least one compiler in common use that warns about extern int fred[1]; extern int fred[1]; being a repeated declaration (despite being legal C). Warner
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