https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125853
Bug ID: 125853
Summary: [17 Regression] Bootstrap broken on RISC-V
Product: gcc
Version: 17.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: law at gcc dot gnu.org
Target Milestone: ---
This change:
commit 6dbcda7f978ce7fba81e81971911d00b2d1ccab0
Author: Jim Tsung-Chun Lin <[email protected]>
Date: Wed Jun 3 09:03:10 2026 +0800
RISC-V: Run smart multilib match even when generic matcher picked a dir
The generic textual matcher in gcc.cc:set_multilib_dir does not
understand RISC-V arch supersetting and treats MULTILIB_DEFAULTS
entries as if they were on the command line via default_arg(). When
the user passes a -march= that is a superset of one of MULTILIB_OPTIONS'
arches but does not textually match, default_arg can rescue the wrong
entry and pick a multilib that is not the closest match.
[ ... ]
Is breaking bootstrap on RISC-V with this error trying to run the stage1
compiler self-tests:
C_ALL=C GCC_COLORS=
/home/jlaw/jenkins/workspace/riscv64-linux-gnu/obj/gcc/./gcc/xgcc
-B/home/jlaw/jenkins/workspace/riscv64-linux-gnu/obj/gcc/./gcc/ -fno-checking
-xc -nostdinc /dev/null -S -o /dev/null
-fself-test=../../../gcc/gcc/testsuite/selftests
xgcc: error: '-march=': ISA string must begin with rv32, rv64, a supported RVA
profile or refer to a supported CPU
This may also be the root cause of the pre-commit CI tester failing to pick up
jobs that was noticed this morning. I haven't confirmed that, it's just a
hunch.
Planning to revert the change Wednesday if it's not fixed.
