[Bug c/19315] document undocumented extension that allows code where variable is not emitted in the asm

iains at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Wed Jul 25 15:44:00 GMT 2018


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19315

--- Comment #7 from Iain Sandoe <iains at gcc dot gnu.org> ---

IMHO (as you say in c#3) this is "surprising behaviour" 
 * if there's any case you'd want it - then maybe you should have to ask for
it.
   (so if it's intentional it should be behind some flag?)
 * it ought to warn by default (not require '-pedantic').
 * as Richi commented in 86670, it means grokdeclarator has conflicting storage
classes which doesn't seem like a useful idea for maintenance.

 I guess the point is "what do we want the behaviour to be?".

 Documenting it doesn't seem to really make it less surprising (if it's an
'extension' then one ought to be able to identify a sensible use-case and put
it in the test-suite).


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