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"the goal is to eliminate C from the source tree so that—except for programs that use cgo" What does the future hold for cgo? Yesterday I ran into erratic DNS

"the goal is to eliminate C from the source tree so that—except for programs that use cgo" What does the future hold for cgo? Yesterday I ran into erratic DNS success with a cross compiled program, win to lin. Haven't had a chance to look further, but I'm wondering when I'll run into similar snags again.

axaxs 12y ago
Can you please raise bug report or let me know what you find here? I work on go native dns library for linux, which iirc is used when crosscompiling rather than libc.
- disputin 12y ago
  Not sure it's a bug, may be "a well-known limitation" (unknown to me) - https://inconshreveable.com/04-30-2014/cross-compiling-golang-programs-with-native-libraries/ https://inconshreveable.com/04-30-2014/cross-compiling-golan... Have a Go: package main import ( "fmt" "net" "os" ) func main() { hostname := "feeds.feedburner.com" if len(os.Args) > 1 { hostname = os.Args[1] } addr, err := net.LookupHost(hostname) if err != nil { fmt.Printf("err: %v", err.Error()) } else { fmt.Printf("addr: %v", addr) } } set GOOS=linux set GOARCH=amd64 set CGO_ENABLED=0
  - axaxs 12y ago
    Hi, I do not have windows box to crosscompile any longer. I did test go 1.4 rc2 with CGO_ENABLED=0, which builds a static binary, and it gives - addr: [74.125.192.118 2607:f8b0:4001:c00::76] Are you seeing different behavior? Please describe...I'll see if I can look into it.
    - disputin 12y ago
      Hi, $ ./dns-win-xc.bin err: lookup feeds.feedburner.com on [178.22.66.167]:53: no such host $ ./dns-lin.bin addr: [173.194.116.64 173.194.116.69 173.194.116.71 173.194.116.65 173.194.116.73 173.194.116.70 173.194.116.67 173.194.116.66 173.194.116.72 173.194.116.78 173.194.116.68 2a00:1450:400c:c0a::76] Win 8.1, go1.3.3., Centos 7. There's a downvoter for some reason, maybe they have something to add...? Don't let me lead you astray - I haven't yet read that article I linked to, but a quick glimpse suggested to me that this isn't a bug.
      - axaxs 12y ago
        I didn't(actually, can't) downvote. Before I dig further, can you try 1.4 rc2? We heavily refactored DNS this release. Secondly, your dns-lin.bin, is that with go built with CGO_ENABLED=0? Ie...if you ldd both files, do they both claim to be statically linked? If you'd like to continue by email, please click my username. Thanks

axaxs 12y ago

Can you please raise bug report or let me know what you find here? I work on go native dns library for linux, which iirc is used when crosscompiling rather than libc.

disputin 12y ago
Not sure it's a bug, may be "a well-known limitation" (unknown to me) - https://inconshreveable.com/04-30-2014/cross-compiling-golang-programs-with-native-libraries/ https://inconshreveable.com/04-30-2014/cross-compiling-golan... Have a Go: package main import ( "fmt" "net" "os" ) func main() { hostname := "feeds.feedburner.com" if len(os.Args) > 1 { hostname = os.Args[1] } addr, err := net.LookupHost(hostname) if err != nil { fmt.Printf("err: %v", err.Error()) } else { fmt.Printf("addr: %v", addr) } } set GOOS=linux set GOARCH=amd64 set CGO_ENABLED=0
- axaxs 12y ago
  Hi, I do not have windows box to crosscompile any longer. I did test go 1.4 rc2 with CGO_ENABLED=0, which builds a static binary, and it gives - addr: [74.125.192.118 2607:f8b0:4001:c00::76] Are you seeing different behavior? Please describe...I'll see if I can look into it.
  - disputin 12y ago
    Hi, $ ./dns-win-xc.bin err: lookup feeds.feedburner.com on [178.22.66.167]:53: no such host $ ./dns-lin.bin addr: [173.194.116.64 173.194.116.69 173.194.116.71 173.194.116.65 173.194.116.73 173.194.116.70 173.194.116.67 173.194.116.66 173.194.116.72 173.194.116.78 173.194.116.68 2a00:1450:400c:c0a::76] Win 8.1, go1.3.3., Centos 7. There's a downvoter for some reason, maybe they have something to add...? Don't let me lead you astray - I haven't yet read that article I linked to, but a quick glimpse suggested to me that this isn't a bug.
    - axaxs 12y ago
      I didn't(actually, can't) downvote. Before I dig further, can you try 1.4 rc2? We heavily refactored DNS this release. Secondly, your dns-lin.bin, is that with go built with CGO_ENABLED=0? Ie...if you ldd both files, do they both claim to be statically linked? If you'd like to continue by email, please click my username. Thanks