fumbling

README.md

@@ -94,3 +94,141 @@ go tool dist: unknown $GOARCH ppc
 The first error comes from `src/cmd/go/internal/work/action.go`, in `func CheckGOOSARCHPair`.
 
 In `src/cmd/dist/build.go`, add `ppc` to the `okgoarch` array.
+
+Next failure:
+
+```
+Building packages and commands for target, linux/ppc.
+cmd/go: unsupported GOOS/GOARCH pair linux/ppc
+go tool dist: FAILED: /home/cell/github/pepaslabs/go-ppc/pkg/tool/linux_amd64/go_bootstrap install -gcflags=all= -ldflags=all= -v std cmd: exit status 2
+```
+
+`CheckGOOSARCHPair` checks the map `OSArchSupportsCgo` in `src/cmd/go/internal/cfg/zosarch.go`.
+
+We need to add `"linux/ppc": true` to this map, but the first line of the file notes *Code generated by go tool dist; DO NOT EDIT.*.
+
+`zosarch.go` is generated by the function `mkzosarch` in `src/cmd/dist/buildgo.go`.
+
+Running `go tool dist` gets us:
+
+```
+$ go tool dist
+usage: go tool dist [command]
+Commands are:
+
+banner         print installation banner
+bootstrap      rebuild everything
+clean          deletes all built files
+env [-p]       print environment (-p: include $PATH)
+install [dir]  install individual directory
+list [-json]   list all supported platforms
+test [-h]      run Go test(s)
+version        print Go version
+
+All commands take -v flags to emit extra information.
+```
+
+Let's try `go tool dist bootstrap`:
+
+```
+$ go tool dist bootstrap -v
+go tool dist: mkdir /usr/local/go/pkg/obj/go-build: permission denied
+```
+
+Perhaps as root?
+
+```
+# go tool dist bootstrap -v
+Building Go toolchain1 using /root/go1.4.
+go tool dist: FAILED: /root/go1.4/bin/go install -gcflags=-l -tags=math_big_pure_go compiler_bootstrap -v bootstrap/cmd/...: fork/exec /root/go1.4/bin/go: no such file or directory
+```
+
+Perhaps I just need to run `make.bash`?
+
+```
+$ ./make.bash 
+Building Go cmd/dist using /usr/local/go. (go1.14.2 linux/amd64)
+Building Go toolchain1 using /usr/local/go.
+Building Go bootstrap cmd/go (go_bootstrap) using Go toolchain1.
+Building Go toolchain2 using go_bootstrap and Go toolchain1.
+Building Go toolchain3 using go_bootstrap and Go toolchain2.
+Building packages and commands for linux/amd64.
+---
+Installed Go for linux/amd64 in /home/cell/github/pepaslabs/go-ppc
+Installed commands in /home/cell/github/pepaslabs/go-ppc/bin
+```
+
+That seemed to work...
+
+But zosarch.go still hasn't been updated:
+
+```
+$ cat cmd/go/internal/cfg/zosarch.go | grep ppc
+        "aix/ppc64": true,
+        "linux/ppc64": false,
+        "linux/ppc64le": true,
+```
+
+Welp, let's try editing `zosarch.go` by hand.
+
+```
+$ ./build-linux-ppc.sh
+...
+Building packages and commands for target, linux/ppc.
+cmd/go: unsupported GOOS/GOARCH pair linux/ppc
+go tool dist: FAILED: /home/cell/github/pepaslabs/go-ppc/pkg/tool/linux_amd64/go_bootstrap install -gcflags=all= -ldflags=all= -v std cmd: exit status 2
+```
+
+Hmm.
+
+Ok, so my current `go` binary doesn't support `linux/ppc`, and it is what is failing:
+
+```
+$ go tool dist list | grep ppc
+aix/ppc64
+linux/ppc64
+linux/ppc64le
+```
+
+So first I need to build a `go` which doesn't abort as soon as it sees a `linux/ppc` `GOOS/GOARCH`.
+
+Let's try `GOOS=linux GOARCH=ppc ./bootstrap.bash`.
+
+```
+$ GOOS=linux GOARCH=ppc ./bootstrap.bash 
+#### Copying to ../../go-linux-ppc-bootstrap
+
+#### Cleaning ../../go-linux-ppc-bootstrap
+Removing VERSION.cache
+Removing bin/
+Removing pkg/
+Removing src/cmd/cgo/zdefaultcc.go
+Removing src/cmd/dist/dist
+Removing src/cmd/go/internal/cfg/zdefaultcc.go
+Removing src/cmd/go/internal/cfg/zosarch.go
+Removing src/cmd/internal/objabi/zbootstrap.go
+Removing src/go/build/zcgo.go
+Removing src/runtime/internal/sys/zversion.go
+
+#### Building ../../go-linux-ppc-bootstrap
+
+cmd/go: unsupported GOOS/GOARCH pair linux/ppc
+Building Go cmd/dist using /usr/local/go. ()
+Building Go toolchain1 using /usr/local/go.
+Building Go bootstrap cmd/go (go_bootstrap) using Go toolchain1.
+Building Go toolchain2 using go_bootstrap and Go toolchain1.
+Building Go toolchain3 using go_bootstrap and Go toolchain2.
+Building packages and commands for host, linux/amd64.
+Building packages and commands for target, linux/ppc.
+cmd/go: unsupported GOOS/GOARCH pair linux/ppc
+go tool dist: FAILED: /home/cell/github/pepaslabs/go-linux-ppc-bootstrap/pkg/tool/linux_amd64/go_bootstrap install -gcflags=all= -ldflags=all= std cmd: exit status 2
+```
+
+Also, `zosarch.go` has been reset and no longer contains `linux/ppc`:
+
+```
+$ cat cmd/go/internal/cfg/zosarch.go | grep ppc
+        "aix/ppc64": true,
+        "linux/ppc64": false,
+        "linux/ppc64le": true,
+```