[Bug go/63731] Fallback to netgo does not work

[boger at us dot ibm.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63731

--- Comment #23 from boger at us dot ibm.com ---
If I look at this documentation:  http://tip.golang.org/doc/go1.4#gocmd

It says this:

The behavior of the go build subcommand's -a flag has been changed for
non-development installations. For installations running a released
distribution, the -a flag will no longer rebuild the standard library and
commands, to avoid overwriting the installation's files. 

When I read this it sounds like the previous behavior with the -a option was to
rebuild the packages and put the newly built packages into the installed
directories, including the standard library.  If everyone who used 'go build'
with -a generated their own copy of the built packages and then threw them
away, how would the installation's files ever get overwritten?