[llvm] [Support/BLAKE3] quick fix for Cygwin build (PR #148635)

[Tomohiro Kashiwada via llvm-commits]

https://github.com/kikairoya created https://github.com/llvm/llvm-project/pull/148635

BLAKE3 1.8.2 ( imported in d2ad63a193216d008c8161879a59c5f42e0125cc ) fails to build for the Cygwin target.

see: https://github.com/BLAKE3-team/BLAKE3/issues/494

As a temporary workaround, add `&& !defined(__CYGWIN__)` to BLAKE3 locally.

resolves https://github.com/llvm/llvm-project/issues/148365

>From 0175ae84c2481b17eb3d783f8e8f78ecea492319 Mon Sep 17 00:00:00 2001
From: kikairoya <kikairoya at gmail.com>
Date: Mon, 14 Jul 2025 22:38:56 +0900
Subject: [PATCH] [Support/BLAKE3] quick fix for Cygwin build

---
 llvm/lib/Support/BLAKE3/blake3_dispatch.c | 2 +-
 llvm/lib/Support/BLAKE3/blake3_impl.h     | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/Support/BLAKE3/blake3_dispatch.c b/llvm/lib/Support/BLAKE3/blake3_dispatch.c
index d00580fe35195..19918aa708b2f 100644
--- a/llvm/lib/Support/BLAKE3/blake3_dispatch.c
+++ b/llvm/lib/Support/BLAKE3/blake3_dispatch.c
@@ -236,7 +236,7 @@ void blake3_xof_many(const uint32_t cv[8],
 #if defined(IS_X86)
   const enum cpu_feature features = get_cpu_features();
   MAYBE_UNUSED(features);
-#if !defined(_WIN32) && !defined(BLAKE3_NO_AVX512)
+#if !defined(_WIN32) && !defined(__CYGWIN__) && !defined(BLAKE3_NO_AVX512)
   if (features & AVX512VL) {
     blake3_xof_many_avx512(cv, block, block_len, counter, flags, out, outblocks);
     return;
diff --git a/llvm/lib/Support/BLAKE3/blake3_impl.h b/llvm/lib/Support/BLAKE3/blake3_impl.h
index deed079e468a5..dd71e729f208f 100644
--- a/llvm/lib/Support/BLAKE3/blake3_impl.h
+++ b/llvm/lib/Support/BLAKE3/blake3_impl.h
@@ -324,7 +324,7 @@ void blake3_hash_many_avx512(const uint8_t *const *inputs, size_t num_inputs,
                              uint8_t flags, uint8_t flags_start,
                              uint8_t flags_end, uint8_t *out);
 
-#if !defined(_WIN32)
+#if !defined(_WIN32) && !defined(__CYGWIN__)
 LLVM_LIBRARY_VISIBILITY
 void blake3_xof_many_avx512(const uint32_t cv[8],
                             const uint8_t block[BLAKE3_BLOCK_LEN],