* Thomas Otto: >> > I tried to annotate `cached_wd` via GTY((..)) as on first glance it seems >> > the gc mistakenly re-uses it, but the `gengtype` generated state file never >> > picks this variable up. >> >> Have you tried moving the variable to the top level and annotating it >> with GTY ((cache))? >> >> I believe gengtype will emit code to clear such variables during >> garbage collection, avoiding the issue. > > Thanks, `static GTY(()) const char* cached_wd = NULL;` outside the > function fixes it. (style: Is directly outside the function Ok, or > should this be moved to the top of the file?) Just move it before the the function and add a comment how it is used (only in the following function). There's a similar example in varasm.c at least. > Now gtype.state picks it up and the final object contains the > correct string. Nice. Would you be willing to send a patch to gcc-patches?
