win32 使用go編譯go自身

如直接自己編譯自己，會出現下面的錯誤：

$ cd /c/go/src  

$ ./make.bat  
building go cmd/dist using c:\go  
go tool: no such tool "compile"  
go tool: no such tool "compile"  
go tool: no such tool "compile"  
go tool: no such tool "compile"  
go tool: no such tool "compile"  
go tool: no such tool "compile"  
go tool: no such tool "compile"  
go tool: no such tool "compile"

$ go env  

set goarch=amd64  
set gobin=  
set goexe=.exe  
set gohostarch=amd64  
set gohostos=windows  
set goos=windows  
set gopath=e:\dev\golang  
set gorace=  
set goroot=c:\go  
set gotmpdir=  
set gotooldir=c:\go\pkg\tool\windows_amd64  
set gccgo=gccgo  
set cc=gcc  
set cxx=g++  
set cgo_enabled=1  
set cgo_cflags=-g -o2  
set cgo_cppflags=  
set cgo_cxxflags=-g -o2  
set cgo_fflags=-g -o2  
set cgo_ldflags=-g -o2  
set pkg_config=pkg-config

說明

$ goos=windows goarch=amd64 ./make.bat  

# building c bootstrap tool.  
cmd/dist  
# building compilers and go bootstrap tool.  
e:\go\src\lib9\fmt\fltfmt.c: in function '__efgfmt':  
e:\go\src\lib9\fmt\fltfmt.c:437:5: warning: this statement may fall through [-wi                        mplicit-fallthrough=]  
if(ndigits > prec) {  
^  e:\go\src\lib9\fmt\fltfmt.c:451:2: note: here                 
省略大部分日誌 
---  
installed go for windows/amd64 in e:\go  
installed commands in e:\go\bin

修改goroot_bootstrap，設定為e:\go，重新編譯

$ goos=windows goarch=amd64 ./make.bat

# building c bootstrap tool.

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