Go patch committed: Pass -I to gotools build

[Ian Lance Taylor <iant at golang dot org>]

The Go compiler uses the -I option to find imported packages.  It also
supports -L options to find them, expecting -L options to be passed
from the gccgo compiler driver.  Because it expects -L to come from
the driver, it searches VERSION and VERSION/MACHINE subdirectories
first.

The in-tree build of the gotools directory was passing -L options to
the in-tree libgo, but not -I options.  The compiler driver also
passes the default -L options.  The effect of this was that if you
installed libgo, and then did a build with the same prefix, the build
of gotools would search the installed libgo before the in-tree one.
That normally works fine, but PR 80814 reports a case where it didn't.

Fix this by having gotools pass a -I option, as expected, pointing to
the in-tree libgo.  Bootstrapped on x86_64-pc-linux-gnu.  Committed to
mainline.

Ian

2017-05-18  Ian Lance Taylor  <iant@golang.org>

PR go/80814
* Makefile.am (AM_GOCFLAGS): Define.
* Makefile.in: Rebuild.

Attachment: patch.txt
Description: Text document