From 869a386eedd003ea113f216e9a059a840101301b Mon Sep 17 00:00:00 2001
From: Dmitry Kalinkin <dmitry.kalinkin@gmail.com>
Date: Fri, 12 Nov 2021 22:14:54 -0500
Subject: [PATCH] vc_0_7: fix darwin build

---
 pkgs/development/libraries/vc/0.7.nix         |  3 ++
 .../libraries/vc/vc_0_7_clang_fix.patch       | 28 +++++++++++++++++++
 2 files changed, 31 insertions(+)
 create mode 100644 pkgs/development/libraries/vc/vc_0_7_clang_fix.patch

diff --git a/pkgs/development/libraries/vc/0.7.nix b/pkgs/development/libraries/vc/0.7.nix
index dd5b03f2dc50..310635d9cbf3 100644
--- a/pkgs/development/libraries/vc/0.7.nix
+++ b/pkgs/development/libraries/vc/0.7.nix
@@ -11,6 +11,9 @@ stdenv.mkDerivation rec {
     sha256 = "190s4r2n3jsivl4j2m288j3rqmgjj6gl308hi9mzwyhcfn17q8br";
   };
 
+  # Avoid requesting an unreasonable intrinsic
+  patches = lib.optional stdenv.cc.isClang ./vc_0_7_clang_fix.patch;
+
   nativeBuildInputs = [ cmake ];
 
   postPatch = ''
diff --git a/pkgs/development/libraries/vc/vc_0_7_clang_fix.patch b/pkgs/development/libraries/vc/vc_0_7_clang_fix.patch
new file mode 100644
index 000000000000..29ea6f529490
--- /dev/null
+++ b/pkgs/development/libraries/vc/vc_0_7_clang_fix.patch
@@ -0,0 +1,28 @@
+diff -ur a/sse/intrinsics.h b/sse/intrinsics.h
+--- a/sse/intrinsics.h	2021-11-12 22:09:50.000000000 -0500
++++ b/sse/intrinsics.h	2021-11-12 22:14:08.000000000 -0500
+@@ -498,16 +498,6 @@
+         case 0:
+             f = _mm_cvtss_f32(v);
+             break;
+-#if defined VC_IMPL_SSE4_1 && !defined VC_MSVC
+-        default:
+-#ifdef VC_GCC
+-            f = __builtin_ia32_vec_ext_v4sf(static_cast<__v4sf>(v), (i));
+-#else
+-            // MSVC fails to compile this because it can't optimize i to an immediate
+-            _MM_EXTRACT_FLOAT(f, v, i);
+-#endif
+-            break;
+-#else
+         case 1:
+             f = _mm_cvtss_f32(_mm_castsi128_ps(_mm_srli_si128(_mm_castps_si128(v), 4)));
+             break;
+@@ -517,7 +507,6 @@
+         case 3:
+             f = _mm_cvtss_f32(_mm_castsi128_ps(_mm_srli_si128(_mm_castps_si128(v), 12)));
+             break;
+-#endif
+         }
+         return f;
+     }