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Allow the accepted aarch64 target through winsup configury and define its Automake conditional. Add configure-only CI coverage for both the existing x86_64 target and AArch64.\n\nThe winsup change backports cygwin/cygwin@2138e80.\n\nCo-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Backport accepted Cygwin commit aeea9ae for AArch64 CONTEXT and mcontext register mappings. Resolve the later pthread cancellation stack-alignment change to match current upstream: preserve the x86_64 path and align AArch64 SP to 16 bytes. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Compile the Cygwin mcontext layout and portable register aliases with the published aarch64-pc-cygwin toolchain. Temporarily probe the subsequent full-build failure so the next blocker can be identified precisely. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
The published aarch64-pc-cygwin toolchain contains ARM64-hosted binaries, so execute the register-context check on GitHub's ARM64 Ubuntu runner. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Compile the internal cygwin/signal.h with the same foundational types supplied by the public signal header. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Remove the one-time full-build probe now that it identified the next blocker. Keep the digest-pinned AArch64 compile check as the permanent regression test. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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arm64-poc-old
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Caution
OLD ARM64 POC - REFERENCE ONLY
Do not merge. Do not use as a PR base. Do not add to a new stack. Do not consume its build artifacts.
vNext epoch:
2026-08-31-v1Classification:
POC-SUPERSEDEDReplacement:
pendingSummary
Backport the first two accepted Cygwin AArch64 prerequisites to the
msys2-3.6.10line:aarch64through thewinsuptarget-processor gate and defineTARGET_AARCH64CONTEXT/__mcontextlayout and portable register aliases used by exceptions, profiling, and pthread cancellationaarch64-pc-cygwinand a digest-pinned AArch64 compile check for the register layout/aliasesThis intentionally uses
aarch64-pc-cygwin, notaarch64-pc-msys: since msys2#303, MSYS2 builds the runtime with the Cygwin triplet and applies MSYS behavior in runtime sources. It does not reintroduce the stale*-*-msysconfigury from msys2#356.Upstream provenance
No parent commit of
aeea9aewas required; its parent is unrelated malloc-wrapper work. The only cherry-pick conflict was with the newer pthread stack-alignment fix already on this branch. It is resolved to current upstream behavior: x86_64 retainsSP % 16 == 8, while AArch64 aligns SP to 16 bytes before redirecting the instruction pointer.Validation
aarch64-pc-cygwin-g++compile of every AArch64CONTEXT/__mcontextoffset and_CX_*/_MC_*alias passed on an ARM64 Ubuntu runner: https://github.com/msys2/msys2-runtime/actions/runs/31727267518/job/94538649809aarch64-pc-cygwinwinsup configure passed: https://github.com/msys2/msys2-runtime/actions/runs/31727267518/job/94538649903x86_64-pc-cygwinwinsup configure passed: https://github.com/msys2/msys2-runtime/actions/runs/31727267518/job/94538649936The seven downstream
msys2-testsmatrix jobs reached their shared keyring test and then failed for the same external trust error:Key 87771331B3F1FF5263856A6D974C8BE49078F532 does not have full trust. This is unrelated to the runtime diff; preceding tests completed normally.Next blocker
A one-time full AArch64 build probe advanced past this patch and stopped while compiling
newlib/libm/math/k_standard.c:That is the x86_64-only inline
__getreent()stack-base lookup. Its accepted upstream fix is cygwin/cygwin@e97c157.The later signal/SEH implementation is deliberately not folded into this PR. It is a larger, non-contiguous accepted series beginning with the gendef stubs (
f38c75a), incorporating the AArch64 gendef/sigdelayed work and the VEH fix (b0a9b62), then converging through0cde89e→5f5462d→2a953c1→4054e78→bc99666. That series should be reviewed separately with its intervening ABI/newlib prerequisites.