libc: use zig isnan and derivates for mingw

1 files changed, 26 insertions, 0 deletions

diff --git a/lib/c/math.zig b/lib/c/math.zig
new file mode 100644
index 0000000000..161e400e6d
--- /dev/null
+++ b/lib/c/math.zig
@@ -0,0 +1,26 @@
+const std = @import("std");
+const common = @import("common.zig");
+const builtin = @import("builtin");
+
+comptime {
+    if (builtin.target.isMinGW()) {
+        @export(&isnan, .{ .name = "isnan", .linkage = common.linkage, .visibility = common.visibility });
+        @export(&isnan, .{ .name = "__isnan", .linkage = common.linkage, .visibility = common.visibility });
+        @export(&isnanf, .{ .name = "isnanf", .linkage = common.linkage, .visibility = common.visibility });
+        @export(&isnanf, .{ .name = "__isnanf", .linkage = common.linkage, .visibility = common.visibility });
+        @export(&isnanl, .{ .name = "isnanl", .linkage = common.linkage, .visibility = common.visibility });
+        @export(&isnanl, .{ .name = "__isnanl", .linkage = common.linkage, .visibility = common.visibility });
+    }
+}
+
+fn isnan(x: f64) callconv(.c) c_int {
+    return if (std.math.isNan(x)) 1 else 0;
+}
+
+fn isnanf(x: f32) callconv(.c) c_int {
+    return if (std.math.isNan(x)) 1 else 0;
+}
+
+fn isnanl(x: c_longdouble) callconv(.c) c_int {
+    return if (std.math.isNan(x)) 1 else 0;
+}