cmd/go: fixes

* Install tools into tool dir always
  (Fixes issue 3049.  Fixes issue 2868.  Fixes issue 2925.)
* Make packages depend on compiler, linker (Fixes issue 3036.)
* Do not recompile packages across roots (Fixes issue 3149.)
* Allow use of binary-only packages (Fixes issue 2775.)
* Avoid duplicate cgo dependencies (Fixes issue 3001.)
* Show less in go get -x.  (Fixes issue 2926.)
* Do not force repo root for existing checkout (Fixes issue 2969.)
* Show full syntax error list always (Fixes issue 2811.)
* Clean arguments before processing (Fixes issue 3034.)
* Add flags for compiler, linker arguments (Fixes issue 2996.)
* Pass flags in make.bash (Fixes issue 3091.)
* Unify build flags, defined in one place.
* Clean up error messages (Fixes issue 3075.  Fixes issue 2923.)
* Support local import paths (Fixes issue 3118.)
* Allow top-level package outside $GOPATH (Fixes issue 3009.)

In addition to these fixes, all commands now take a list of
go files as a way to specify a single package, just as go build and
go run always have.  This means you can:

        go list -json x.go
        go fix x.go
        go vet x.go
        go test x_test.go

Preliminary tests in test.bash.
Mainly testing things that the ordinary build does not.
I don't mind if the script doesn't run on Windows.

I expect that gccgo support is now broken, and I hope that
people will feel free to file issues and/or send CLs to fix it.  :-)

R=golang-dev, dsymonds, r, rogpeppe
CC=golang-dev
http://codereview.appspot.com/5708054

1 files changed, 25 insertions, 2 deletions

diff --git a/src/make.bash b/src/make.bash
index cb7051bab..8b249ca3b 100755
--- a/src/make.bash
+++ b/src/make.bash
@@ -3,6 +3,29 @@
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 
+# Environment variables that control make.bash:
+#
+# GOROOT_FINAL: The expected final Go root, baked into binaries.
+# The default is the location of the Go tree during the build.
+#
+# GOHOSTARCH: The architecture for host tools (compilers and
+# binaries).  Binaries of this type must be executable on the current
+# system, so the only common reason to set this is to set
+# GOHOSTARCH=386 on an amd64 machine.
+#
+# GOARCH: The target architecture for installed packages and tools.
+#
+# GOOS: The target operating system for installed packages and tools.
+#
+# GCFLAGS: Additional 5g/6g/8g arguments to use when
+# building the packages and commands.
+#
+# LDFLAGS: Additional 5l/6l/8l arguments to use when
+# building the packages and commands.
+#
+# CGO_ENABLED: Setting this to 0 disables the use of cgo
+# in the built and installed packages and tools.
+
 set -e
 if [ ! -f run.bash ]; then
 	echo 'make.bash must be run from $GOROOT/src' 1>&2
@@ -88,12 +111,12 @@ echo
 if [ "$GOHOSTARCH" != "$GOARCH" -o "$GOHOSTOS" != "$GOOS" ]; then
 	echo "# Building packages and commands for host, $GOHOSTOS/$GOHOSTARCH."
 	GOOS=$GOHOSTOS GOARCH=$GOHOSTARCH \
-		$GOTOOLDIR/go_bootstrap install -v std
+		$GOTOOLDIR/go_bootstrap install -gcflags "$GCFLAGS" -ldflags "$LDFLAGS" -v std
 	echo
 fi
 
 echo "# Building packages and commands for $GOOS/$GOARCH."
-$GOTOOLDIR/go_bootstrap install -v std
+$GOTOOLDIR/go_bootstrap install -gcflags "$GCFLAGS" -ldflags "$LDFLAGS" -v std
 echo
 
 rm -f $GOTOOLDIR/go_bootstrap