From 97c6d4fb3e78815d08cd61c63fcce57ab08b55ea Mon Sep 17 00:00:00 2001
From: Jakub Konka <kubkon@jakubkonka.com>
Date: Mon, 10 Jan 2022 18:50:32 +0100
Subject: [PATCH] Build fs/filesystem libcxx module when targeting GNU Win

---
 src/libcxx.zig | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/libcxx.zig b/src/libcxx.zig
index 2da680a40d..14ef2a7b04 100644
--- a/src/libcxx.zig
+++ b/src/libcxx.zig
@@ -114,8 +114,8 @@ pub fn buildLibCXX(comp: *Compilation) !void {
     for (libcxx_files) |cxx_src| {
         var cflags = std.ArrayList([]const u8).init(arena);
 
-        if (target.os.tag == .windows or target.os.tag == .wasi) {
-            // Filesystem stuff isn't supported on WASI and Windows.
+        if ((target.os.tag == .windows and target.abi == .msvc) or target.os.tag == .wasi) {
+            // Filesystem stuff isn't supported on WASI and Windows (MSVC).
             if (std.mem.startsWith(u8, cxx_src, "src/filesystem/"))
                 continue;
         }