From c072558b90f1bbedc2022b0f30c8b1ac4712538e Mon Sep 17 00:00:00 2001
From: Ondřej Surý <ondrej@sury.org>
Date: Fri, 18 Feb 2011 09:50:58 +0100
Subject: Imported Upstream version 2011.02.15

---
 src/cmd/cgo/doc.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'src/cmd/cgo/doc.go')

diff --git a/src/cmd/cgo/doc.go b/src/cmd/cgo/doc.go
index c4868345c..b3aa9aded 100644
--- a/src/cmd/cgo/doc.go
+++ b/src/cmd/cgo/doc.go
@@ -25,9 +25,12 @@ the package.  For example:
 
 CFLAGS and LDFLAGS may be defined with pseudo #cgo directives
 within these comments to tweak the behavior of gcc.  Values defined
-in multiple directives are concatenated together.  For example:
+in multiple directives are concatenated together.  Options prefixed
+by $GOOS, $GOARCH, or $GOOS/$GOARCH are only defined in matching
+systems.  For example:
 
 	// #cgo CFLAGS: -DPNG_DEBUG=1
+	// #cgo linux CFLAGS: -DLINUX=1
 	// #cgo LDFLAGS: -lpng
 	// #include <png.h>
 	import "C"
-- 
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