Cannot compile Go language on Mac OS X 10.6.7 - go

Question

When following instructions on Getting Started - The Go Programming Language, I get the code and try to run the all.bash script.
But I get this error after a lot of other successful looking output:
INSTALL FAIL net
CGOPKGPATH= cgo -- cgo_bsd.go cgo_unix.go
touch _obj/_cgo_run
6g -o _go_.6 dial.go dnsmsg.go fd_darwin.go hosts.go ip.go ipsock.go iprawsock.go lookup.go net.go parse.go pipe.go sock.go tcpsock.go udpsock.go unixsock.go newpollserver.go fd.go file.go dnsconfig.go dnsclient.go port.go _obj/cgo_bsd.cgo1.go _obj/cgo_unix.cgo1.go _obj/_cgo_gotypes.go
6c -FVw -I/Users/matryer/Work/go/pkg/darwin_amd64 -I . -o "_cgo_defun.6" _obj/_cgo_defun.c
gcc -m64 -I . -g -fPIC -O2 -o _cgo_main.o -c _obj/_cgo_main.c
gcc -m64 -I . -g -fPIC -O2 -o cgo_bsd.cgo2.o -c _obj/cgo_bsd.cgo2.c
gcc -m64 -I . -g -fPIC -O2 -o cgo_unix.cgo2.o -c _obj/cgo_unix.cgo2.c
gcc -m64 -I . -g -fPIC -O2 -o _cgo_export.o -c _obj/_cgo_export.c
gcc -m64 -g -fPIC -O2 -o _cgo1_.o _cgo_main.o cgo_bsd.cgo2.o cgo_unix.cgo2.o _cgo_export.o
cgo -dynimport _cgo1_.o >_obj/_cgo_import.c_ && mv -f _obj/_cgo_import.c_ _obj/_cgo_import.c
6c -FVw -I . -o "_cgo_import.6" _obj/_cgo_import.c
cgo_bsd.go:5[_obj/cgo_bsd.cgo1.go:8]: undefined: _Cconst_AI_MASK
cgo_unix.go:69[_obj/cgo_unix.cgo1.go:72]: undefined: _Cconst_AI_ALL
cgo_unix.go:69[_obj/cgo_unix.cgo1.go:72]: undefined: _Cconst_AI_V4MAPPED
cgo_unix.go:69[_obj/cgo_unix.cgo1.go:72]: undefined: _Cconst_AI_CANONNAME
make[1]: *** [_go_.6] Error 1
make: *** [net.install] Error 1
Has anybody else seen this and fixed it?
I am running Snow Leopard (10.6.7) build 10J869.

Answer 1

It's an open issue, relating to a new version of Xcode, for OS X 10.7 and 10.6.7.
Issue 1881: cgo const error on OS X 10.7
NOTE: Revision 142f0bc0d6e7 has been made to close issue 1881. To update Go for all changes up to and including this revision, run:
$ cd $GOROOT/src
$ hg pull
$ hg update 142f0bc0d6e7
$ ./all.bash

Answer 2

You don't indicate exactly which version of Go you are building. Note that it is a dynamic project where the versions change frequently.
I just ran hg pull and hg update in a directory where I've previously compiled Go successfully (on MacOS X 10.6.7). Then I ran sh all.bash and I didn't see any issues during the build or test phases (though it takes longer to build now than it did when Go was first announced).
FWIW, hg tags gives me:
tip 8715:599657138e00
weekly.2011-06-09 8703:c81944152e97
weekly 8703:c81944152e97
weekly.2011-06-02 8623:3418f22c39eb
weekly.2011-05-22 8483:c98449d685d2
release.r57.1 8294:95d2ce135523
And the end of the build cycle gives:
--- cd ../test
0 known bugs; 0 unexpected bugs
ALL TESTS PASSED
---
Installed Go for darwin/amd64 in /Users/jleffler/go.
Installed commands in /Users/jleffler/bin.
The compiler is 6g.
Therefore...
There is a chance that if you change the version of Go (possibly to a more recent one), then it will work for you, too.
And, another FWIW or FYI, I redid the build on a different machine also running MacOS X 10.6.7 this afternoon, and the tip version is slightly different, and there are apparently 2 known bugs.
--- cd ../test
2 known bugs; 0 unexpected bugs
ALL TESTS PASSED
---
Installed Go for darwin/amd64 in /Users/jleffler/External-Source-Repositories/hg/go.
Installed commands in /Users/jleffler/External-Source-Repositories/hg/go/bin.
*** You need to add /Users/jleffler/External-Source-Repositories/hg/go/bin to your $PATH. ***
The compiler is 6g.
On OS X the debuggers must be installed setgrp procmod.
Read and run ./sudo.bash to install the debuggers.
real 4m55.695s
user 2m52.436s
sys 1m10.222s
Osiris-9 JL: hg tags | sed 15q
tip 8716:164ef168486b
weekly.2011-06-09 8703:c81944152e97
weekly 8703:c81944152e97
weekly.2011-06-02 8623:3418f22c39eb
weekly.2011-05-22 8483:c98449d685d2
release.r57.1 8294:95d2ce135523
The timing information (just under 5 minutes for the build and test cycle) is from running:
time all.bash