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clang 21.1.0-rc1 creates broken executables on Cygwin

clangClang issues not falling into any other categoryClang issues not falling into any other category

Status: Open.

#149639 In llvm/llvm-project;

· jeremyd2019 opened on Jul 19, 2025

[LoongArch] Canadian build failed for loongarch64-linux-* : LLVM ERROR: Do not know how to widen this operator's operand!

new issue

Status: Open.

#149636 In llvm/llvm-project;

· trcrsired opened on Jul 19, 2025

Pre-C23 check in for declaration is incorrect

accepts-invalid

c

clang:frontendLanguage frontend issues, e.g. anything involving "Sema"Language frontend issues, e.g. anything involving "Sema"

diverges-from:gccDoes the clang frontend diverge from gcc on this issueDoes the clang frontend diverge from gcc on this issue

Status: Open.

#149633 In llvm/llvm-project;

· Halalaluyafail3 opened on Jul 19, 2025

[LLVM][LoongArch] <code>X86SnippetRepetitorTest.Loop</code> test fails

backend:loongarch

build-problem

Status: Open.

#149616 In llvm/llvm-project;

· wegank opened on Jul 18, 2025

Wrong LICM of expression involving pointer to <code>alloca</code> object in coroutine function

coroutinesC++20 coroutinesC++20 coroutines

loopoptim

Status: Open.

#149604 In llvm/llvm-project;

· weiguozhi opened on Jul 18, 2025

clang-scan-deps strips the suffix .private from module names

clang-tools-extra

Status: Open.

#149594 In llvm/llvm-project;

· illiminable opened on Jul 18, 2025

[AArch64] Bad machine code: Using a killed virtual register

backend:AArch64

Status: Open.

#149585 In llvm/llvm-project;

· sjoerdmeijer opened on Jul 18, 2025

[LLD][RISCV] LLD RISC-V relaxation bug

lld

Status: Open.

#149583 In llvm/llvm-project;

· luismarques opened on Jul 18, 2025

[x86]: isel incorrectly optimizes pblendvb with partial vector usage to unconditional move

backend:X86

miscompilation

Status: Open.

Bug

#149580 In llvm/llvm-project;

· aneshlya opened on Jul 18, 2025

[flang][OpenMP] Crash with DO CONCURRENT lowering

crashPrefer [crash-on-valid] or [crash-on-invalid]Prefer [crash-on-valid] or [crash-on-invalid]

flang:ir

flang:openmp

Status: Open.

Bug

#149563 In llvm/llvm-project;

· eugeneepshteyn opened on Jul 18, 2025

[HLSL][SPIRV] Investigate how to handle float controls on Vulkan 1.3 and earlier.

HLSLHLSL Language SupportHLSL Language Support

Status: Open.

#149561 In llvm/llvm-project;

· spall opened on Jul 18, 2025

[HLSL][RootSignature] Add Root Signature object manipulation options

HLSLHLSL Language SupportHLSL Language Support

Status: Open.

#149560 In llvm/llvm-project;

· inbelic opened on Jul 18, 2025