https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67987
--- Comment #3 from Steve Kargl <sgk at troutmask dot apl.washington.edu> --- On Fri, Oct 16, 2015 at 06:03:06PM +0000, kargl at gcc dot gnu.org wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67987 > > --- Comment #2 from kargl at gcc dot gnu.org --- > (In reply to kargl from comment #1) > > I have a patch that I'm testing. For the code in the > > intial report I get > > > > troutmask:sgk[238] gfc6 -c g6.f90 > > g6.f90:2:15: > > > > character(-8) :: c = ' ' > > 1 > > Error: LEN at (1) must be greater than or equal to 0 > > Seems the patch causes a regression for char_length_2.f90. > This test came in with the fix for PR fortran/31250, where > negative length parameters are silently set to 0. The > fix for this regression is in resolve.c. Unfortnately, > this fix then exposes an issue with substring referecences. > For "string"(1:-1), this should result in a 0 length string, > but gfortran is setting the length to -1 in > gfc_resolve_substring_charlen. > Go the substring issued ironed out.
