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-rw-r--r--src/cmd/internal/sys/args.go13
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diff --git a/src/cmd/internal/sys/args.go b/src/cmd/internal/sys/args.go
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+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sys
+
+// ExecArgLengthLimit is the number of bytes we can safely
+// pass as arguments to an exec.Command.
+//
+// Windows has a limit of 32 KB. To be conservative and not worry about whether
+// that includes spaces or not, just use 30 KB. Darwin's limit is less clear.
+// The OS claims 256KB, but we've seen failures with arglen as small as 50KB.
+const ExecArgLengthLimit = (30 << 10)