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cmd/cgo: update #cgo docs to reflect reality

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The syntax accepted is full build constraints, not just
GOOS, GOARCH, and GOOS/GOARCH.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/13504048
This commit is contained in:
Russ Cox 2013-09-23 16:29:53 -04:00
parent 05ff4d7a1a
commit 3c1ece2cb4
1 changed files with 5 additions and 3 deletions
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8
src/cmd/cgo/doc.go
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@ -27,11 +27,13 @@ http://golang.org/doc/articles/c_go_cgo.html.
CFLAGS, CPPFLAGS, CXXFLAGS and LDFLAGS may be defined with pseudo #cgo
directives within these comments to tweak the behavior of the C or C++
compiler. Values defined in multiple directives are concatenated
together. Options prefixed by $GOOS, $GOARCH, or $GOOS/$GOARCH are
only defined in matching systems. For example:
together. The directive can include a list of build constraints limiting its
effect to systems satisfying one of the constraints
(see http://golang.org/pkg/go/build/#hdr-Build_Constraints for details about the constraint syntax).
For example:
// #cgo CFLAGS: -DPNG_DEBUG=1
// #cgo linux CFLAGS: -DLINUX=1
// #cgo amd64 386 CFLAGS: -DX86=1
// #cgo LDFLAGS: -lpng
// #include <png.h>
import "C"