From aaa4bf75d386058d6aca8c4db7244c51c27ce386 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Wed, 17 Jul 2019 18:11:03 -0400
Subject: [PATCH] msvc libc: provide _fltused symbol

---
 std/special/c.zig | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/std/special/c.zig b/std/special/c.zig
index 7300b8bf74..150127196b 100644
--- a/std/special/c.zig
+++ b/std/special/c.zig
@@ -12,6 +12,10 @@ const is_wasm = switch (builtin.arch) {
     .wasm32, .wasm64 => true,
     else => false,
 };
+const is_msvc = switch (builtin.abi) {
+    .msvc => true,
+    else => false,
+};
 const is_freestanding = switch (builtin.os) {
     .freestanding => true,
     else => false,
@@ -25,9 +29,13 @@ comptime {
         @export("strncmp", strncmp, .Strong);
         @export("strerror", strerror, .Strong);
         @export("strlen", strlen, .Strong);
+    } else if (is_msvc) {
+        @export("_fltused", _fltused, .Strong);
     }
 }
 
+extern var _fltused: c_int = 1;
+
 extern fn main(argc: c_int, argv: [*][*]u8) c_int;
 extern fn wasm_start() void {
     _ = main(0, undefined);