1.克隆Go源码：

# 克隆代码
git clone https://github.com/golang/go.git
# 切换到1.14分支
git checkout release-branch.go1.14

2.编译：

cd go/src
./all.bash

报错：

./make.bash: line 165: /Users/peakchao/go1.4/bin/go: No such file or directory
Building Go cmd/dist using /Users/peakchao/go1.4. ()
ERROR: Cannot find /Users/peakchao/go1.4/bin/go.
Set $GOROOT_BOOTSTRAP to a working Go tree >= Go 1.4.

高版本编译需要用到1.4版本，所以先编译1.4:

git checkout release-branch.go1.4
./all.bash

编译完成：

# Building C bootstrap tool.
cmd/dist# Building compilers and Go bootstrap tool for host, darwin/amd64.
lib9
libbio
liblink
cmd/cc
cmd/gc
cmd/6l
/Users/peakchao/App/go/src/cmd/6l/../ld/dwarf.c:1479:15: warning: implicit conversion from 'int' to 'char' changes value from 156 to -100 [-Wconstant-conversion]
/Users/peakchao/App/go/src/cmd/6l/../ld/dwarf.c:1763:21: warning: implicit conversion from 'int' to 'char' changes value from 144 to -112 [-Wconstant-conversion]
/Users/peakchao/App/go/src/cmd/6l/../ld/lib.h:168:13: note: expanded from macro 'cput'
cmd/6a
cmd/6c
/Users/peakchao/App/go/src/cmd/6c/txt.c:995:28: warning: shifting a negative signed value is undefined [-Wshift-negative-value]
/Users/peakchao/App/go/src/cmd/6c/txt.c:1045:28: warning: shifting a negative signed value is undefined [-Wshift-negative-value]
cmd/6g
runtime
errors
sync/atomic
sync
io
unicode
unicode/utf8
unicode/utf16
bytes
math
strings
strconv
bufio
sort
container/heap
encoding/base64
syscall
time
os
reflect
fmt
encoding
encoding/json
flag
path/filepath
path
io/ioutil
log
regexp/syntax
regexp
go/token
go/scanner
go/ast
go/parser
os/exec
os/signal
net/url
text/template/parse
text/template
go/doc
go/build
cmd/go# Building packages and commands for darwin/amd64.
runtime
errors
sync/atomic
unicode
unicode/utf8
math
sort
encoding
unicode/utf16
container/list
crypto/subtle
container/ring
image/color
runtime/race
sync
container/heap
image/color/palette
io
syscall
hash
crypto/cipher
hash/crc32
crypto/hmac
hash/adler32
hash/crc64
hash/fnv
bytes
strings
bufio
text/tabwriter
path
html
compress/bzip2
time
strconv
math/rand
math/cmplx
os
reflect
regexp/syntax
crypto
encoding/base64
net/url
crypto/aes
crypto/rc4
encoding/ascii85
encoding/base32
image
crypto/md5
crypto/sha1
crypto/sha256
crypto/sha512
encoding/pem
image/draw
image/jpeg
path/filepath
net
os/signal
io/ioutil
os/exec
regexp
fmt
encoding/binary
cmd/pprof/internal/svg
crypto/des
index/suffixarray
cmd/internal/goobj
cmd/internal/rsc.io/arm/armasm
cmd/internal/rsc.io/x86/x86asm
debug/dwarf
debug/gosym
debug/plan9obj
flag
log
go/token
encoding/json
encoding/xml
text/template/parse
compress/flate
go/scanner
math/big
encoding/hex
mime
go/ast
net/http/internal
runtime/pprof
cmd/pack
debug/elf
debug/macho
debug/pe
compress/gzip
cmd/pprof/internal/tempfile
text/template
archive/tar
archive/zip
compress/lzw
cmd/pprof/internal/profile
crypto/elliptic
encoding/asn1
crypto/rand
crypto/dsa
compress/zlib
crypto/rsa
net/textproto
go/parser
go/printer
database/sql/driver
cmd/internal/objfile
encoding/csv
encoding/gob
database/sql
crypto/ecdsa
crypto/x509/pkix
mime/multipart
image/gif
image/png
log/syslog
crypto/x509
go/doc
html/template
net/mail
os/user
runtime/debug
cmd/addr2line
cmd/nm
cmd/objdump
testing
cmd/pprof/internal/plugin
cmd/pprof/internal/symbolz
testing/iotest
cmd/cgo
go/format
cmd/gofmt
cmd/pprof/internal/symbolizer
go/build
cmd/fix
cmd/yacc
testing/quick
crypto/tls
text/scanner
cmd/pprof/internal/report
cmd/pprof/internal/commands
cmd/pprof/internal/driver
net/http
net/smtp
cmd/go
cmd/pprof/internal/fetch
expvar
net/http/cgi
net/http/cookiejar
net/http/httptest
net/http/httputil
net/http/pprof
net/rpc
cmd/pprof
net/http/fcgi
net/rpc/jsonrpcBuild complete; skipping tests.
To force tests, set GO14TESTS=1 and re-run, but expect some failures.

编译1.14版本:

git checkout release-branch.go1.14
./all.bash

输出：

./make.bash: line 165: /Users/peakchao/go1.4/bin/go: No such file or directory
Building Go cmd/dist using /Users/peakchao/go1.4. ()
ERROR: Cannot find /Users/peakchao/go1.4/bin/go.
Set $GOROOT_BOOTSTRAP to a working Go tree >= Go 1.4.

3.配置1.4环境后重新编译：

# 切换到1.4分支
git checkout release-branch.go1.4
# 复制1.4到提示目录，也可以通过设置$GOROOT_BOOTSTRAP环境变量解决
cp ~/go ~/go1.4 -rf
git checkout release-branch.go1.14
git clean -dfx
./all.bash

输出：

Building Go cmd/dist using /Users/peakchao/go1.4. (go1.4-bootstrap-20170531 darwin/amd64)
Building Go toolchain1 using /Users/peakchao/go1.4.
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 darwin/amd64.##### Testing packages.
ok  	archive/tar	2.301s
ok  	archive/zip	1.430s
ok  	bufio	0.697s
ok  	bytes	1.212s
ok  	compress/bzip2	0.441s
ok  	compress/flate	2.064s
ok  	compress/gzip	1.699s
ok  	compress/lzw	0.856s
ok  	compress/zlib	2.507s
ok  	container/heap	2.602s
ok  	container/list	2.875s
ok  	container/ring	3.123s
ok  	context	4.684s
ok  	crypto	3.118s
ok  	crypto/aes	3.401s
ok  	crypto/cipher	3.635s
ok  	crypto/des	4.060s
ok  	crypto/dsa	4.070s
ok  	crypto/ecdsa	3.996s
ok  	crypto/ed25519	4.091s
ok  	crypto/elliptic	4.078s
ok  	crypto/hmac	4.347s
ok  	crypto/internal/subtle	4.103s
ok  	crypto/md5	4.067s
ok  	crypto/rand	4.046s
ok  	crypto/rc4	4.098s
ok  	crypto/rsa	3.788s
ok  	crypto/sha1	3.428s
ok  	crypto/sha256	3.628s
ok  	crypto/sha512	3.730s
ok  	crypto/subtle	3.659s
ok  	crypto/tls	3.761s
ok  	database/sql	3.194s
ok  	database/sql/driver	2.565s
ok  	debug/dwarf	2.370s
ok  	debug/elf	2.862s
ok  	debug/gosym	3.074s
ok  	debug/macho	3.490s
ok  	debug/pe	3.429s
ok  	debug/plan9obj	3.514s
ok  	encoding/ascii85	3.613s
ok  	encoding/asn1	3.590s
ok  	encoding/base32	3.316s
ok  	encoding/base64	3.369s
ok  	encoding/binary	3.036s
ok  	encoding/csv	3.109s
ok  	encoding/gob	3.305s
ok  	encoding/hex	2.995s
ok  	encoding/json	2.900s
ok  	encoding/pem	2.596s
ok  	encoding/xml	3.124s
ok  	errors	3.245s
ok  	expvar	2.893s
ok  	flag	3.340s
ok  	fmt	3.839s
ok  	go/ast	3.802s
ok  	go/build	4.074s
ok  	go/constant	3.961s
ok  	go/doc	3.901s
ok  	go/format	3.957s
ok  	go/importer	4.034s
ok  	go/internal/gccgoimporter	3.581s
ok  	go/internal/gcimporter	4.276s
ok  	go/internal/srcimporter	4.417s
ok  	go/parser	4.256s
ok  	go/printer	4.138s
ok  	go/scanner	3.675s
ok  	go/token	3.636s
ok  	go/types	4.210s
ok  	hash	3.195s
ok  	hash/adler32	3.440s
ok  	hash/crc32	3.595s
ok  	hash/crc64	3.903s
ok  	hash/fnv	3.727s
ok  	hash/maphash	3.603s
ok  	html	3.307s
ok  	html/template	3.223s
ok  	image	3.095s
ok  	image/color	3.168s
ok  	image/draw	3.295s
ok  	image/gif	3.581s
ok  	image/jpeg	3.630s
ok  	image/png	3.274s
ok  	index/suffixarray	4.200s
ok  	internal/cpu	1.969s
ok  	internal/fmtsort	3.679s
ok  	internal/poll	5.395s
ok  	internal/reflectlite	5.015s
ok  	internal/singleflight	1.921s
ok  	internal/trace	2.298s
ok  	internal/xcoff	2.101s
ok  	io	2.529s
ok  	io/ioutil	2.765s
ok  	log	4.793s
ok  	log/syslog	6.720s
ok  	math	5.257s
ok  	math/big	6.667s
ok  	math/bits	5.332s
ok  	math/cmplx	5.636s
ok  	math/rand	6.221s
ok  	mime	6.238s
ok  	mime/multipart	6.327s
ok  	mime/quotedprintable	6.212s
ok  	net	6.088s
ok  	net/http	11.106s
ok  	net/http/cgi	2.991s
ok  	net/http/cookiejar	4.818s
ok  	net/http/fcgi	4.892s
ok  	net/http/httptest	5.195s
ok  	net/http/httptrace	5.599s
ok  	net/http/httputil	5.249s
ok  	net/http/internal	5.147s
ok  	net/http/pprof	8.541s
ok  	net/internal/socktest	6.019s
ok  	net/mail	6.866s
ok  	net/rpc	6.179s
ok  	net/rpc/jsonrpc	4.474s
ok  	net/smtp	4.443s
ok  	net/textproto	6.913s
ok  	net/url	6.846s
ok  	os	6.660s
ok  	os/exec	4.707s
ok  	os/signal	10.322s
ok  	os/user	5.406s
ok  	path	5.345s
ok  	path/filepath	5.267s
ok  	plugin	4.175s
ok  	reflect	6.298s
ok  	regexp	7.030s
ok  	regexp/syntax	8.374s
ok  	runtime	53.213s
ok  	runtime/debug	6.649s
ok  	runtime/internal/atomic	7.053s
ok  	runtime/internal/math	7.320s
ok  	runtime/internal/sys	6.982s
ok  	runtime/pprof	20.282s
ok  	runtime/pprof/internal/profile	7.003s
ok  	runtime/trace	8.134s
ok  	sort	5.677s
ok  	strconv	5.375s
ok  	strings	4.512s
ok  	sync	3.606s
ok  	sync/atomic	3.594s
ok  	syscall	2.663s
ok  	testing	3.400s
ok  	testing/iotest	3.312s
ok  	testing/quick	3.234s
ok  	text/scanner	2.783s
ok  	text/tabwriter	3.180s
ok  	text/template	2.928s
ok  	text/template/parse	3.303s
ok  	time	5.857s
ok  	unicode	2.978s
ok  	unicode/utf16	3.199s
ok  	unicode/utf8	3.957s
ok  	cmd/addr2line	10.116s
ok  	cmd/api	5.832s
ok  	cmd/asm/internal/asm	6.211s
ok  	cmd/asm/internal/lex	5.494s
ok  	cmd/compile	2.438s
ok  	cmd/compile/internal/gc	17.988s
ok  	cmd/compile/internal/logopt	5.153s
ok  	cmd/compile/internal/ssa	4.830s
ok  	cmd/compile/internal/syntax	3.450s
ok  	cmd/compile/internal/test	2.841s [no tests to run]
ok  	cmd/compile/internal/types	2.685s
ok  	cmd/cover	17.359s
ok  	cmd/doc	5.632s
ok  	cmd/fix	7.109s
ok  	cmd/go	71.735s
ok  	cmd/go/internal/auth	5.069s
ok  	cmd/go/internal/cache	5.325s
ok  	cmd/go/internal/generate	7.034s
ok  	cmd/go/internal/get	6.218s
ok  	cmd/go/internal/imports	5.004s
ok  	cmd/go/internal/load	4.997s
ok  	cmd/go/internal/lockedfile	5.068s
ok  	cmd/go/internal/lockedfile/internal/filelock	5.217s
ok  	cmd/go/internal/modconv	4.674s
ok  	cmd/go/internal/modfetch	4.519s
ok  	cmd/go/internal/modfetch/codehost	4.824s
ok  	cmd/go/internal/modfetch/zip_sum_test	5.082s
ok  	cmd/go/internal/modload	4.560s
ok  	cmd/go/internal/mvs	4.735s
ok  	cmd/go/internal/par	4.871s
ok  	cmd/go/internal/renameio	5.686s
ok  	cmd/go/internal/search	4.781s
ok  	cmd/go/internal/txtar	4.713s
ok  	cmd/go/internal/web	4.387s
ok  	cmd/go/internal/work	3.345s
ok  	cmd/gofmt	3.024s
ok  	cmd/internal/buildid	3.151s
ok  	cmd/internal/dwarf	3.579s
ok  	cmd/internal/edit	3.619s
ok  	cmd/internal/goobj	6.910s
ok  	cmd/internal/obj	2.667s
ok  	cmd/internal/obj/arm64	3.026s
ok  	cmd/internal/obj/riscv	2.690s
ok  	cmd/internal/obj/x86	6.984s
ok  	cmd/internal/objabi	2.926s
ok  	cmd/internal/src	3.032s
ok  	cmd/internal/test2json	3.279s
ok  	cmd/link	5.683s
ok  	cmd/link/internal/ld	9.549s
ok  	cmd/link/internal/sym	2.120s
ok  	cmd/nm	6.625s
ok  	cmd/objdump	6.328s
ok  	cmd/pack	8.937s
ok  	cmd/trace	2.387s
ok  	cmd/vet	9.727s
...

4.配置环境变量：

#go
export GOROOT_BOOTSTRAP=/Users/peakchao/go1.4
export GOROOT=/Users/peakchao/App/go
export GOPATH=/Users/peakchao/App/gopath
export GOBIN=${GOPATH}/bin
export PATH=${PATH}:${GOBIN}:${GOROOT}/bin

5.校验：

go version