https://sourceware.org/bugzilla/show_bug.cgi?id=34176
Bug ID: 34176
Summary: [RISC-V ld] missing second pass relax to C.JAL
Product: binutils
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: l784896635 at gmail dot com
Target Milestone: ---
During RISC-V linker regression/conformance testing, I reduced this
linker-stage issue.
## Actual behavior
GNU ld.bfd 2.45 leaves the critical call as a 32-bit jal ra even though the
final resolved displacement is within c.jal range; ld.lld on the same object
emits c.jal for the critical call.
## Expected behavior
The linker should produce the semantically correct RISC-V output for this
reduced testcase, or issue a controlled diagnostic when the input is outside
the supported semantics. It should not silently emit a wrong output, lose
required metadata/relocations/attributes, miss a required relaxation, report a
false range/non-PIC/non-convergence error, or crash.
## Test input and intent
A sequence of RV32C calls shrinks in the first pass from auipc+jalr to jal.
That shrink should bring one critical call within c.jal range, so the linker
should run a second compression pass and emit c.jal for the critical call.
## Target and route
- Target tracker: GNU binutils / ld
- Target ISA / ABI: `rv32imac` / `ilp32`
- First failing stage: link
- Toolchain route used in reduction: gas+ld.bfd with gas+ld.lld control
## Reproduction evidence
3 clean reproductions in packaged run1..run3 evidence show stable ld.bfd
critical output jal ra,target and stable ld.lld control output c.jal target
from the same jal_to_cjal.o object.
The reproducer bundle contains the reduced testcase plus three local
reproduction runs. The evidence is text-only: linker outputs, disassembly,
relocation dumps, symbol dumps, and short summaries where available.
Reproducer bundle:
https://github.com/anonymous25989/riscv-linker-48-reproducers/raw/main/r48-v2/attachments/gnu_005_missing_second_pass_relax_to_cjal_reproducer.zip
## Notes
This is reported as a linker-stage behavior defect found during RISC-V linker
regression/conformance testing. The reduced testcase is intentionally small so
that the failure mode is easy to inspect. The attached evidence is already
reproduced; no additional local path or private workspace is required.
--
You are receiving this mail because:
You are on the CC list for the bug.
