Build/install gold instead of all of binutils.

Build/install gold instead of all of binutils.

BUG=none
TEST=none

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=74682

[Lei Zhang, 2011-02-11 21:22:26]

While debugging the ARM bot yesterday, I noticed in the bash history that they
only build gold and not all of binutils.

[Lei Zhang, 2011-02-11 21:23:58]

to mmoss since evan is afk.

[Michael Moss, 2011-02-11 21:37:16]

Does this mean it just installs ld without tools like strip and objcopy? Is that
safe when we do things like strip and link to the debug symbols? Don't we need
the gold tools to operate on gold binaries?

[Lei Zhang, 2011-02-11 21:41:46]

On 2011/02/11 21:37:16, Michael Moss wrote:
> Does this mean it just installs ld without tools like strip and objcopy? Is
that
> safe when we do things like strip and link to the debug symbols? Don't we need
> the gold tools to operate on gold binaries?

Currently we build strip/objcopy from source, stash them in /usr/local/gold/,
and never use them. We are using the system strip/objcopy and they work fine. It
doesn't matter if the ELF files are generated by GNU ld or gold.

[Michael Moss, 2011-02-11 21:47:06]

> Currently we build strip/objcopy from source, stash them in /usr/local/gold/,
> and never use them.

stage_build.py (official build) disagrees:
Using "objcopy" from /usr/local/gold/bin/objcopy

[Lei Zhang, 2011-02-11 22:00:20]

On 2011/02/11 21:47:06, Michael Moss wrote:
> > Currently we build strip/objcopy from source, stash them in
/usr/local/gold/,
> > and never use them.
> 
> stage_build.py (official build) disagrees:
> Using "objcopy" from /usr/local/gold/bin/objcopy

Ya, I forgot about the official bot. Do you remember what the exact problem was
when you used /usr/bin/objcopy instead of /usr/local/gold/bin/objcopy?

[Lei Zhang, 2011-02-11 22:05:49]

We can also go with patch set 2, which builds gold and binutils.

It's a slight improvement over just running make. We skip out on:
as, elfedit, gprof, gnu ld, and nm.

[Michael Moss, 2011-02-11 22:07:42]

> Ya, I forgot about the official bot. Do you remember what the exact problem
was
> when you used /usr/bin/objcopy instead of /usr/local/gold/bin/objcopy?

I don't recall for sure, but I think it either segfaulted or did something
really obviously wrong, like stripped the binary down to 0 bytes.

[Michael Moss, 2011-02-11 22:09:11]

On 2011/02/11 22:05:49, Lei Zhang wrote:
> We can also go with patch set 2, which builds gold and binutils.
> 
> It's a slight improvement over just running make. We skip out on:
> as, elfedit, gprof, gnu ld, and nm.

Yeah, that's probably safest. LGTM