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cgo: os/arch dependent #cgo directives

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This enables #cgo directives to contain a os/arch
specification which restricts the definition of
the given option to matching systems.

For example:

#cgo amd64 CFLAGS: -DAMD64=1
#cgo linux CFLAGS: -DLINUX=1
#cgo linux/amd64 CFLAGS: -DLINUX_ON_AMD64=1

R=rsc
CC=golang-dev
https://golang.org/cl/4121048
This commit is contained in:
Gustavo Niemeyer 2011-02-03 13:51:47 -05:00 committed by Russ Cox
parent 3f61184e1b
commit ab15a978fb
2 changed files with 27 additions and 3 deletions
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5
src/cmd/cgo/doc.go
View File

@ -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"

25
src/cmd/cgo/gcc.go
View File

@ -19,6 +19,7 @@ import (
"go/parser"
"go/token"
"os"
"runtime"
"strconv"
"strings"
"unicode"
@ -66,6 +67,8 @@ func cname(s string) string {
func (p *Package) ParseFlags(f *File, srcfile string) {
linesIn := strings.Split(f.Preamble, "\n", -1)
linesOut := make([]string, 0, len(linesIn))
NextLine:
for _, line := range linesIn {
l := strings.TrimSpace(line)
if len(l) < 5 || l[:4] != "#cgo" || !unicode.IsSpace(int(l[4])) {
@ -79,11 +82,29 @@ func (p *Package) ParseFlags(f *File, srcfile string) {
fatal("%s: bad #cgo line: %s", srcfile, line)
}
k := fields[0]
v := strings.TrimSpace(fields[1])
var k string
kf := strings.Fields(fields[0])
switch len(kf) {
case 1:
k = kf[0]
case 2:
k = kf[1]
switch kf[0] {
case runtime.GOOS:
case runtime.GOARCH:
case runtime.GOOS + "/" + runtime.GOARCH:
default:
continue NextLine
}
default:
fatal("%s: bad #cgo option: %s", srcfile, fields[0])
}
if k != "CFLAGS" && k != "LDFLAGS" {
fatal("%s: unsupported #cgo option %s", srcfile, k)
}
v := strings.TrimSpace(fields[1])
args, err := splitQuoted(v)
if err != nil {
fatal("%s: bad #cgo option %s: %s", srcfile, k, err.String())