CL 4873048 introduced the ability to build without hg and
getting an "unknown" version. While this approach works
to avoid the hg dependency, it also means that every
exported tree that is built without hg or .hg will have not
only missing information, but will also be compatible to
one another. Considering that it is a common practice to
remove the VCS data in distributions, I suggest we don't
take this approach to avoid its consequences.
This CL fixes the same problem in a different way: if a
VERSION file at the top of the tree exists, use it at
all times. If it doesn't, fall back to using information
from hg necessarily, and fail if that's not possible. The
error message when VERSION and hg are not available
instructs users to handle it properly.
The VERSION file can be generated with
"src/version.bash -save" while hg is still around.
R=golang-dev, rsc, gustavo
CC=golang-dev
https://golang.org/cl/4897043
The object files begin with a header that is
$GOARCH
on a line by itself. This CL changes that header to
go object $GOOS $GOARCH release.2011-01-01 4567+
where the final two fields are the most recent release
tag and the current hg version number.
All objects imported into a Go compilation or linked into an
executable must have the same header line, and that header
line must match the compiler and linker versions.
The effect of this will be that if you update and run all.bash
and then try to link in objects compiled with an earlier version
of the compiler (or invoke the wrong version of the compiler),
you will get an error showing the different headers instead
of perhaps silent incompatibility.
Normal usage with all.bash should be unaffected, because
all.bash deletes all the object files in $GOROOT/pkg/$GOOS_$GOARCH
and cleans all intermediate object files before starting.
This change is intended to diagnose stale objects arising when
users maintaining alternate installation directories forget to
rebuild some of their files after updating.
It should help make the adoption of $GOPATH (CL 3780043)
less error-prone.
R=ken2, r
CC=golang-dev
https://golang.org/cl/4023063
