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| author | Russ Cox <rsc@golang.org> | 2013-09-23 16:29:53 -0400 |
|---|---|---|
| committer | Russ Cox <rsc@golang.org> | 2013-09-23 16:29:53 -0400 |
| commit | a4f9e9a489a32fc266c1358626617752fe965b13 (patch) | |
| tree | ba9f778af420d0df2b7ca8155c2706659b7d32fb | |
| parent | e107738a9d3e271f44dbdf9d80ba144761f8f89d (diff) | |
| download | go-a4f9e9a489a32fc266c1358626617752fe965b13.tar.gz | |
cmd/cgo: update #cgo docs to reflect reality
The syntax accepted is full build constraints, not just
GOOS, GOARCH, and GOOS/GOARCH.
R=golang-dev, iant
CC=golang-dev
https://codereview.appspot.com/13504048
| -rw-r--r-- | src/cmd/cgo/doc.go | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/src/cmd/cgo/doc.go b/src/cmd/cgo/doc.go index 8ee6ddf95..275872632 100644 --- a/src/cmd/cgo/doc.go +++ b/src/cmd/cgo/doc.go @@ -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" |