https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122606
Bug ID: 122606
Summary: Compilation failure building gccrs
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rust
Assignee: unassigned at gcc dot gnu.org
Reporter: Keith.S.Thompson at gmail dot com
CC: dkm at gcc dot gnu.org, gcc-rust at gcc dot gnu.org,
pierre-emmanuel.patry at embecosm dot com
Target Milestone: ---
I'm building gcc from source on Ubuntu 24.04.3 LTS x86_64, using "gcc (Ubuntu
13.3.0-6ubuntu2~24.04) 13.3.0" as the host compiler.
I haven't seen this problem with any released version of gcc. I see it when
building from recent versions on the master branch of the git repo. I did a
"git clean" before each attempted build.
It appears that commit c8461400fd2 introduced the problem.
The commands I'm using for the build (omitting some irrelevant details, which I
can provide if needed) are:
mkdir _objdir
cd _objdir
../configure --prefix=... --enable-host-shared --enable-languages=rust
make -j 4 bootstrap
With commit b76bb3f2260, dated Sun 2025-08-10, the build completes.
With the immediately following commit, c8461400fd2, dated Tue 2025-08-12, the
build fails. The first error message is:
.../gcc/gcc/rust/ast/rust-fmt.h:68:9: error: array subscript 2 is outside array
bounds of ‘void [24]’ [-Werror=array-bounds=]
68 | if (cap)
| ^~~
I frankly haven't been able to make sense of the error message, but it causes
the build to fail.
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