https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125626
Bug ID: 125626
Summary: OpenMP: Add front-end diagnostics for unused iterator
variables
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Keywords: diagnostic, openmp
Severity: normal
Priority: P3
Component: other
Assignee: unassigned at gcc dot gnu.org
Reporter: sandra at gcc dot gnu.org
CC: burnus at gcc dot gnu.org
Target Milestone: ---
We formerly had some code in the gimplifier that emitted a warning about OpenMP
iterator variables that were not used. It was removed in commit
gcc-17-1387-g32bbd8849a5 because it resulted in a lot of false positives as
well as confusing messages about internal variables added by the front ends
(e.g., Fortran array descriptors), or expansion of deep mapping or user-defined
mappers.
It would be nice to have some warnings about code that is likely incorrect, but
the diagnostic needs to be issued by the respective front ends; the gimplifier
is too late.
In addition to the commit message for the patch mentioned above, Tobias's
review comment on it raised some additional issues.
https://gcc.gnu.org/pipermail/gcc-patches/2026-June/719436.html
