From 5d4439cc3e9dc9196fc109552f36594ad97542c5 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Fri, 11 Aug 2023 17:34:16 -0700
Subject: libcxx: update to LLVM 17

release/17.x branch, commit 8f4dd44097c9ae25dd203d5ac87f3b48f854bba8

This adds the flag `-D_LIBCPP_PSTL_CPU_BACKEND_SERIAL`. A future
enhancement could possibly pass something different if there is a
compelling parallel implementation. That libdispatch one might be worth
looking into.
---
 src/Compilation.zig | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/Compilation.zig')

diff --git a/src/Compilation.zig b/src/Compilation.zig
index 0150d615e3..d6157fec82 100644
--- a/src/Compilation.zig
+++ b/src/Compilation.zig
@@ -4318,6 +4318,9 @@ pub fn addCCArgs(
             try argv.append("-D_LIBCPP_HAS_NO_THREADS");
         }
 
+        // See the comment in libcxx.zig for more details about this.
+        try argv.append("-D_LIBCPP_PSTL_CPU_BACKEND_SERIAL");
+
         try argv.append(try std.fmt.allocPrint(arena, "-D_LIBCPP_ABI_VERSION={d}", .{
             @intFromEnum(comp.libcxx_abi_version),
         }));
-- 
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