diff options
| -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" |