https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105914
Bug ID: 105914
Summary: gccrs setting warn_unused_variable breaks thousands of
non-Rust tests
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rust
Assignee: unassigned at gcc dot gnu.org
Reporter: ro at gcc dot gnu.org
Target Milestone: ---
I've just finished bootstrapping the devel/rust/master branch on all of
Linux/x86_64,
Linux/i686, Solaris/x86_64, and Solaris/x86 with --enable-languages=rust.
The rust testresults are fine everywhere, but one change badly breaks C and C++
tests like this:
FAIL: gcc.c-torture/compile/pr99787-1.c -O0 (test for excess errors)
Excess errors:
/vol/gcc/src/git/rust/gcc/testsuite/gcc.c-torture/compile/pr99787-1.c:10:12:
warning: unused variable 'f' [-Wunused-variable]
There are several thousand failures like this, all over the place (gcc, g++,
libgomp, libitm, libstdc++). I'm pretty certain this is due to this snippet
in gcc/rust/lang.opt:
Wunused-variable
Rust Var(warn_unused_variable) Init(1) Warning
; documented in common.opt
Obviously this causes the warning to default to on for every language, not just
for Rust. I haven't tried looking how to avoid this.
