[Bug c/91285] _Pragma does not work in a useful fashion
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91285 Martin Liška changed: What|Removed |Added Status|UNCONFIRMED |NEW Last reconfirmed||2020-01-28 CC||marxin at gcc dot gnu.org Ever confirmed|0 |1
[Bug c/91285] _Pragma does not work in a useful fashion
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91285 --- Comment #4 from joseph at codesourcery dot com --- Note that all the standard C pragmas are even more restricted than GCC's statement-like pragmas - the standard pragmas (which aren't implemented in GCC) are defined by the C standard to be allowed only "either outside external declarations or preceding all explicit declarations and statements inside a compound statement". The wider the range of contexts in which a pragma is permitted, the harder it is to define its semantics. For diagnostic pragmas, note that some diagnostics are associated with a *range* of locations within an expression, leading to obvious questions about the semantics if diagnostic pragma state varies within that range. (Though that could also arise when statement-like pragmas are used within the existing statement expression extension.)
[Bug c/91285] _Pragma does not work in a useful fashion
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91285 Eric Gallager changed: What|Removed |Added CC||egallager at gcc dot gnu.org --- Comment #3 from Eric Gallager --- related to or dup of bug 90400 or bug 69558?
[Bug c/91285] _Pragma does not work in a useful fashion
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91285 --- Comment #2 from Konrad Schwarz --- Thank you for your suggestion -- it does indeed work. However, this is a workaround for this specific problem -- other pragmas cannot be handled in this way -- consider # pragma GCC optimize ... or # pragma align ... or # pragma longcall (although the last two apply to declarations).
[Bug c/91285] _Pragma does not work in a useful fashion
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91285 --- Comment #1 from Andrew Pinski --- Isn't it better to do: # defineENCLOSING_OBJECT(TYPE, MEMBER, OBJECT)\ ((void)sizeof (&((TYPE *) 0)->MEMBER - OBJECT),\ (TYPE *) ((char *) OBJECT - offsetof (TYPE, MEMBER))) Instead?
