cmd/dist: cross-compiling fixes

This CL makes it possible to run make.bash with
GOOS and GOARCH set to something other than
the native host GOOS and GOARCH.

As part of the CL, the tool directory moves from bin/tool/
to pkg/tool/goos_goarch where goos and goarch are
the values for the host system (running the build), not
the target.  pkg/ is not technically appropriate, but C objects
are there now tool (pkg/obj/) so this puts all the generated
binaries in one place (rm -rf $GOROOT/pkg cleans everything).
Including goos_goarch in the name allows different systems
to share a single $GOROOT on a shared file system.

Fixes issue 2920.

R=golang-dev, r
CC=golang-dev
http://codereview.appspot.com/5645093

1 files changed, 29 insertions, 7 deletions

diff --git a/src/make.bat b/src/make.bat
index 010e418c0..6618bc4ed 100644
--- a/src/make.bat
+++ b/src/make.bat
@@ -25,26 +25,48 @@ echo # Building C bootstrap tool.
 echo cmd/dist
 if not exist ..\bin\tool mkdir ..\bin\tool
 :: Windows has no glob expansion, so spell out cmd/dist/*.c.
-gcc -O2 -Wall -Werror -o ../bin/tool/dist.exe -Icmd/dist %DEFGOROOT% cmd/dist/buf.c cmd/dist/build.c cmd/dist/buildgc.c cmd/dist/buildruntime.c cmd/dist/goc2c.c cmd/dist/main.c cmd/dist/windows.c
+gcc -O2 -Wall -Werror -o cmd/dist/dist.exe -Icmd/dist %DEFGOROOT% cmd/dist/buf.c cmd/dist/build.c cmd/dist/buildgc.c cmd/dist/buildruntime.c cmd/dist/goc2c.c cmd/dist/main.c cmd/dist/windows.c
 if errorlevel 1 goto fail
+.\cmd\dist\dist env -wp >env.bat
+if errorlevel 1 goto fail
+call env.bat
+del env.bat
 :: Echo with no arguments prints whether echo is turned on, so echo dot.
 echo .
 
 echo # Building compilers and Go bootstrap tool.
-..\bin\tool\dist bootstrap -v
+.\cmd\dist\dist bootstrap -a -v
 if errorlevel 1 goto fail
+:: Delay move of dist tool to now, because bootstrap cleared tool directory.
+move .\cmd\dist\dist.exe %GOTOOLDIR%\dist.exe
+%GOTOOLDIR%\go_bootstrap clean -i std
 echo .
 
-echo # Building packages and commands.
-..\bin\tool\go_bootstrap clean std
+if not %GOHOSTARCH% == %GOARCH% goto localbuild
+if not %GOHOSTOS% == %GOOS% goto localbuild
+goto mainbuild
+
+:localbuild
+echo # Building tools for local system. %GOHOSTOS%/%GOHOSTARCH%
+set oldGOOS=%GOOS%
+set oldGOARCH=%GOARCH%
+set GOOS=%GOHOSTOS%
+set GOARCH=%GOHOSTARCH%
+%GOTOOLDIR%\go_bootstrap install -v std
+set GOOS=%oldGOOS%
+set GOARCH=%oldGOARCH%
 if errorlevel 1 goto fail
-..\bin\tool\go_bootstrap install -a -v std
+echo .
+
+:mainbuild
+echo # Building packages and commands.
+%GOTOOLDIR%\go_bootstrap install -a -v std
 if errorlevel 1 goto fail
-del ..\bin\tool\go_bootstrap.exe
+del %GOTOOLDIR%\go_bootstrap.exe
 echo .
 
 if "x%1"=="x--no-banner" goto nobanner
-..\bin\tool\dist banner
+%GOTOOLDIR%\dist banner
 :nobanner
 
 goto end