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cmd/go: incorrect DW_AT_comp_dir of package runtime/cgo in section .debug_info #48319

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zhouguangyuan0718 opened this issue Sep 10, 2021 · 10 comments
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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@zhouguangyuan0718
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What version of Go are you using (go version)?

$ go version
go version go1.17 linux/amd64

Does this issue reproduce with the latest release?

yes.

What operating system and processor architecture are you using (go env)?

Two go toolchains are installed on the same mechine, and they are almost the same expect for the GOROOT and GOTOOLDIR.
The details about the first go toolchain (henceforce called "toolchain1") are as follows:

~/goroot1/bin/go Output
$ ~/goroot1/bin/go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/root/.cache/go-build"
GOENV="/root/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/root/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/root/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/mnt/h/1.code/02.Project/godev/cgodwarf/goroot1"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/mnt/h/1.code/02.Project/godev/cgodwarf/goroot1/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.17"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/dev/null"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build1739691040=/tmp/go-build -gno-record-gcc-switches"

The details about the second go toolchain (henceforce called "toolchain2") are as follows:

~/goroot2/bin/go Output
$ ~/goroot2/bin/go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/root/.cache/go-build"
GOENV="/root/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/root/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/root/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/mnt/h/1.code/02.Project/godev/cgodwarf/goroot2"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/mnt/h/1.code/02.Project/godev/cgodwarf/goroot2/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.17"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/dev/null"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build2229440232=/tmp/go-build -gno-record-gcc-switches"

What did you do?

hello.go:

package main

import _ "plugin" // to import runtime/cgo

func main() {
	println("hello")
}

The "hello.go" was built separately with the "toolchain1" and "toolchain2".

$ ~/goroot1/bin/go build  -buildmode=pie -o hello  hello.go
$  readelf --debug-dump=info hello |grep DW_AT_comp_dir|grep src/runtime/cgo
    <61a4d>   DW_AT_comp_dir    : (indirect string, offset: 0x380): /mnt/h/1.code/02.Project/godev/cgodwarf/goroot1/src/runtime/cgo
    <61f0e>   DW_AT_comp_dir    : (indirect string, offset: 0x380): /mnt/h/1.code/02.Project/godev/cgodwarf/goroot1/src/runtime/cgo
    <62562>   DW_AT_comp_dir    : (indirect string, offset: 0x380): /mnt/h/1.code/02.Project/godev/cgodwarf/goroot1/src/runtime/cgo
    <63261>   DW_AT_comp_dir    : (indirect string, offset: 0x380): /mnt/h/1.code/02.Project/godev/cgodwarf/goroot1/src/runtime/cgo
    <63bdd>   DW_AT_comp_dir    : (indirect string, offset: 0x380): /mnt/h/1.code/02.Project/godev/cgodwarf/goroot1/src/runtime/cgo
    <64193>   DW_AT_comp_dir    : (indirect string, offset: 0x380): /mnt/h/1.code/02.Project/godev/cgodwarf/goroot1/src/runtime/cgo
    <6461d>   DW_AT_comp_dir    : (indirect string, offset: 0x380): /mnt/h/1.code/02.Project/godev/cgodwarf/goroot1/src/runtime/cgo
    <650b3>   DW_AT_comp_dir    : (indirect string, offset: 0x380): /mnt/h/1.code/02.Project/godev/cgodwarf/goroot1/src/runtime/cgo
    <65609>   DW_AT_comp_dir    : (indirect string, offset: 0x380): /mnt/h/1.code/02.Project/godev/cgodwarf/goroot1/src/runtime/cgo
    <65b4c>   DW_AT_comp_dir    : (indirect string, offset: 0x380): /mnt/h/1.code/02.Project/godev/cgodwarf/goroot1/src/runtime/cgo
    <66402>   DW_AT_comp_dir    : (indirect string, offset: 0x380): /mnt/h/1.code/02.Project/godev/cgodwarf/goroot1/src/runtime/cgo

$ ~/goroot2/bin/go build  -buildmode=pie -o hello  hello.go
$  readelf --debug-dump=info hello |grep DW_AT_comp_dir|grep src/runtime/cgo
    <61a4d>   DW_AT_comp_dir    : (indirect string, offset: 0x380): /mnt/h/1.code/02.Project/godev/cgodwarf/goroot1/src/runtime/cgo
    <61f0e>   DW_AT_comp_dir    : (indirect string, offset: 0x380): /mnt/h/1.code/02.Project/godev/cgodwarf/goroot1/src/runtime/cgo
    <62562>   DW_AT_comp_dir    : (indirect string, offset: 0x380): /mnt/h/1.code/02.Project/godev/cgodwarf/goroot1/src/runtime/cgo
    <63261>   DW_AT_comp_dir    : (indirect string, offset: 0x380): /mnt/h/1.code/02.Project/godev/cgodwarf/goroot1/src/runtime/cgo
    <63bdd>   DW_AT_comp_dir    : (indirect string, offset: 0x380): /mnt/h/1.code/02.Project/godev/cgodwarf/goroot1/src/runtime/cgo
    <64193>   DW_AT_comp_dir    : (indirect string, offset: 0x380): /mnt/h/1.code/02.Project/godev/cgodwarf/goroot1/src/runtime/cgo
    <6461d>   DW_AT_comp_dir    : (indirect string, offset: 0x380): /mnt/h/1.code/02.Project/godev/cgodwarf/goroot1/src/runtime/cgo
    <650b3>   DW_AT_comp_dir    : (indirect string, offset: 0x380): /mnt/h/1.code/02.Project/godev/cgodwarf/goroot1/src/runtime/cgo
    <65609>   DW_AT_comp_dir    : (indirect string, offset: 0x380): /mnt/h/1.code/02.Project/godev/cgodwarf/goroot1/src/runtime/cgo
    <65b4c>   DW_AT_comp_dir    : (indirect string, offset: 0x380): /mnt/h/1.code/02.Project/godev/cgodwarf/goroot1/src/runtime/cgo
    <66402>   DW_AT_comp_dir    : (indirect string, offset: 0x380): /mnt/h/1.code/02.Project/godev/cgodwarf/goroot1/src/runtime/cgo

What did you expect to see?

When the "hello.go" was built with "toolchain1" , the DW_AT_comp_dir of runtime/cgo in binary was expected to be "……/goroot1/src/runtime/cgo".
When the "hello.go" was built with "toolchain2" , the DW_AT_comp_dir of runtime/cgo in binary was expected to be "……/goroot2/src/runtime/cgo".

What did you see instead?

When the "hello.go" was built with "toolchain1" and "toolchain2", the DW_AT_comp_dir of runtime/cgo is always "……/goroot1/src/runtime/cgo".

@gopherbot
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Change https://golang.org/cl/348991 mentions this issue: cmd/go: add dir of runtime/cgo to the hash of build cache

@thanm thanm added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Sep 10, 2021
@thanm thanm added this to the Backlog milestone Sep 10, 2021
@thanm
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thanm commented Sep 10, 2021

@bcmills @jayconrod

@zhouguangyuan0718
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build_cgo_compdir.txt

@zhouguangyuan0718
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zhouguangyuan0718 commented Sep 17, 2021

The C objects file in runtime/cgo:

root@DESKTOP-S0J32Q2:/mnt/h/1.code/7.godev/go/pkg/linux_amd64/runtime# ar -x cgo.a
root@DESKTOP-S0J32Q2:/mnt/h/1.code/7.godev/go/pkg/linux_amd64/runtime# objdump --dwarf=rawline  _x006.o

_x006.o:     file format elf64-x86-64

Raw dump of debug contents of section .debug_line:

  Offset:                      0x0
  Length:                      675
  DWARF Version:               3
  Prologue Length:             421
  Minimum Instruction Length:  1
  Initial value of 'is_stmt':  1
  Line Base:                   -5
  Line Range:                  14
  Opcode Base:                 13

 Opcodes:
  Opcode 1 has 0 args
  Opcode 2 has 1 arg
  Opcode 3 has 1 arg
  Opcode 4 has 1 arg
  Opcode 5 has 1 arg
  Opcode 6 has 0 args
  Opcode 7 has 0 args
  Opcode 8 has 0 args
  Opcode 9 has 1 arg
  Opcode 10 has 0 args
  Opcode 11 has 0 args
  Opcode 12 has 1 arg

 The Directory Table (offset 0x1b):
  1     /usr/include/x86_64-linux-gnu/bits
  2     /usr/lib/gcc/x86_64-linux-gnu/9/include
  3     /usr/include
  4     /usr/include/x86_64-linux-gnu/bits/types

 The File Name Table (offset 0x9d):
  Entry Dir     Time    Size    Name
  1     0       0       0       gcc_linux_amd64.c
  2     1       0       0       types.h
  3     2       0       0       stddef.h
  4     3       0       0       time.h
  5     1       0       0       pthreadtypes.h
  6     4       0       0       __sigset_t.h
  7     4       0       0       sigset_t.h
  8     3       0       0       signal.h
  9     3       0       0       stdint.h
  10    4       0       0       struct_FILE.h
  11    4       0       0       FILE.h
  12    3       0       0       stdio.h
  13    1       0       0       sys_errlist.h
  14    0       0       0       libcgo.h
  15    3       0       0       stdlib.h
  16    1       0       0       sigthread.h
  17    3       0       0       pthread.h
  18    0       0       0       libcgo_unix.h
  19    3       0       0       string.h
  20    3       0       0       errno.h
………………………………
 objdump --dwarf=info  _x006.o|grep DW_AT_comp_dir
    <15>   DW_AT_comp_dir    : (indirect string, offset: 0x1ce): /mnt/h/1.code/7.godev/go/src/runtime/cgo

The go binary:

objdump --dwarf=rawline hello

hello:     file format elf64-x86-64

Raw dump of debug contents of section .zdebug_line:

  Offset:                      0x0
  Length:                      560
  DWARF Version:               2
  Prologue Length:             378
  Minimum Instruction Length:  1
  Initial value of 'is_stmt':  1
  Line Base:                   -4
  Line Range:                  10
  Opcode Base:                 11

 Opcodes:
  Opcode 1 has 0 args
  Opcode 2 has 1 arg
  Opcode 3 has 1 arg
  Opcode 4 has 1 arg
  Opcode 5 has 1 arg
  Opcode 6 has 0 args
  Opcode 7 has 0 args
  Opcode 8 has 0 args
  Opcode 9 has 1 arg
  Opcode 10 has 0 args

 The Directory Table (offset 0x19):
  1     /mnt/h/1.code/7.godev/go/src/sync
  2     /mnt/h/1.code/7.godev/go/src/sync/atomic
  3     /mnt/h/1.code/7.godev/go/src/internal/race
  4     /mnt/h/1.code/7.godev/go/src/runtime

 The File Name Table (offset 0xb5):
  Entry Dir     Time    Size    Name
  1     0       0       0       
  2     1       0       0       cond.go
  3     1       0       0       mutex.go
  4     1       0       0       runtime2.go
  5     1       0       0       map.go
  6     2       0       0       value.go
  7     1       0       0       once.go
  8     1       0       0       pool.go
  9     1       0       0       poolqueue.go
  10    1       0       0       rwmutex.go
  11    1       0       0       waitgroup.go
  12    1       0       0       runtime.go
  13    2       0       0       doc.go
  14    3       0       0       norace.go
  15    4       0       0       debug.go
  16    4       0       0       alg.go
………………
`objdump --dwarf=info hello|grep DW_AT_comp_dir
    <22>   DW_AT_comp_dir    : .
    <28f>   DW_AT_comp_dir    : .
    <2852>   DW_AT_comp_dir    : .
    <29d1>   DW_AT_comp_dir    : .
    <312c>   DW_AT_comp_dir    : .
    <31ef>   DW_AT_comp_dir    : .
    <32c6>   DW_AT_comp_dir    : .
    <34bb>   DW_AT_comp_dir    : .
    <36b7>   DW_AT_comp_dir    : .
    <38e2>   DW_AT_comp_dir    : .
    <10581>   DW_AT_comp_dir    : .
    <10875>   DW_AT_comp_dir    : .
    <10ac3>   DW_AT_comp_dir    : .
    <10b73>   DW_AT_comp_dir    : .
    <10c11>   DW_AT_comp_dir    : .
    <10ce2>   DW_AT_comp_dir    : .
    <1177d>   DW_AT_comp_dir    : .
    <1182d>   DW_AT_comp_dir    : .
    <11929>   DW_AT_comp_dir    : .
    <119e6>   DW_AT_comp_dir    : .
    <11acb>   DW_AT_comp_dir    : .
    <11c11>   DW_AT_comp_dir    : .
objdump: Error: LEB value too large
    <4d247>   DW_AT_comp_dir    : .
    <4d96b>   DW_AT_comp_dir    : .
    <4da35>   DW_AT_comp_dir    : .
    <4db07>   DW_AT_comp_dir    : .
    <5f90e>   DW_AT_comp_dir    : (indirect string, offset: 0xe): /tmp/go-build
    <5f99c>   DW_AT_comp_dir    : (indirect string, offset: 0xe): /tmp/go-build
    <600de>   DW_AT_comp_dir    : (indirect string, offset: 0xe): /tmp/go-build
    <6016c>   DW_AT_comp_dir    : (indirect string, offset: 0xe): /tmp/go-build
    <601bb>   DW_AT_comp_dir    : (indirect string, offset: 0x39a): /mnt/h/1.code/7.godev/go/src/runtime/cgo
    <6067c>   DW_AT_comp_dir    : (indirect string, offset: 0x39a): /mnt/h/1.code/7.godev/go/src/runtime/cgo
    <60cd0>   DW_AT_comp_dir    : (indirect string, offset: 0x39a): /mnt/h/1.code/7.godev/go/src/runtime/cgo
    <619cf>   DW_AT_comp_dir    : (indirect string, offset: 0x39a): /mnt/h/1.code/7.godev/go/src/runtime/cgo
    <6234b>   DW_AT_comp_dir    : (indirect string, offset: 0x39a): /mnt/h/1.code/7.godev/go/src/runtime/cgo
    <62901>   DW_AT_comp_dir    : (indirect string, offset: 0x39a): /mnt/h/1.code/7.godev/go/src/runtime/cgo
    <62d8b>   DW_AT_comp_dir    : (indirect string, offset: 0x39a): /mnt/h/1.code/7.godev/go/src/runtime/cgo
    <63821>   DW_AT_comp_dir    : (indirect string, offset: 0x39a): /mnt/h/1.code/7.godev/go/src/runtime/cgo
    <63d77>   DW_AT_comp_dir    : (indirect string, offset: 0x39a): /mnt/h/1.code/7.godev/go/src/runtime/cgo
    <642ba>   DW_AT_comp_dir    : (indirect string, offset: 0x39a): /mnt/h/1.code/7.godev/go/src/runtime/cgo
    <64b70>   DW_AT_comp_dir    : (indirect string, offset: 0x39a): /mnt/h/1.code/7.godev/go/src/runtime/cgo`

The dwarfinfo of go files is different from c files.

The DW_AT_comp_dir of go files is always ".". But there is absolutely path in The Directory Table in debug_line, which is generated by linker.
The DW_AT_comp_dir of C files is always absolutely path. But there is relative path in The Directory Table in debug_line, which is compiled by gcc and linker by gcc.

So it's can't be replace GOROOT to fix path with -fdebug-prefix-map.
what we can do is to judge if any C source files exist in the package in GOROOT will be compiled or not, then the go execute will know it should use cache or not.

@zhouguangyuan0718
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build_cgo_compdir.txt

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Change https://golang.org/cl/351851 mentions this issue: Revert "cmd/go: insert goroot to the hash of build cache when the packages include C files"

gopherbot pushed a commit that referenced this issue Sep 23, 2021
…kages include C files"

This reverts commit abbfec2.

Reason to revert: breaks darwin builders.

Updates #48319

Change-Id: I50c957a6a3f46ffcdaf972bdbb0574867ddc9486
Reviewed-on: https://go-review.googlesource.com/c/go/+/351851
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
@bcmills bcmills reopened this Oct 1, 2021
@bcmills bcmills self-assigned this Oct 1, 2021
@bcmills bcmills modified the milestones: Backlog, Go1.18 Oct 1, 2021
@gopherbot
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Change https://golang.org/cl/353352 mentions this issue: cmd/go: insert goroot to the hash of build cache when the packages include C files

@bcmills
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bcmills commented Jan 26, 2022

Reconsidering this in the context of #50183: the DW_AT_comp_dir DIE in particular is supposed to indicate “the current
working directory of the compilation command that produced this compilation unit”, which for a C dependency of a Go program is not meaningful: the actual working directory of a C compile is a throwaway temp directory.

I think it is important for reproducibility that the value of DW_AT_comp_dir be deterministic and well-defined, but I don't think it's important that it be any specific actual directory.

@gopherbot
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Change https://golang.org/cl/380915 mentions this issue: cmd/go: avoid recording GOROOT_FINAL in precompiled C archives

@gopherbot
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Change https://golang.org/cl/380914 mentions this issue: cmd/go: refactor TestScript/build_issue48319 to check a more general property

gopherbot pushed a commit that referenced this issue Jan 26, 2022
…property

The test previously checked that the DWARF DW_AT_comp_dir attribute
matched GOROOT_FINAL. However, on further consideration, we believe
that DW_AT_comp_dir should not actually match GOROOT_FINAL: the DWARF
spec says that DW_AT_comp_dir records “the current working directory
of the compilation command that produced this compilation unit”, but
the actual working directory of the compilation command proper is a
throwaway directory in the build cache — it is neither stable nor
meaningful.

However, the test was getting at a real issue that we do care about:
namely, that the binary produced by a 'go build' command with cgo
enabled should not reuse a dependency that embeds a stale
GOROOT_FINAL.

This change refactors the test to verify the latter property instead
of checking DW_AT_comp_dir specifically.

For #50183
Updates #48319

Change-Id: I0b1151d9ba3d0ff903f72e27850306406e5cb518
Reviewed-on: https://go-review.googlesource.com/c/go/+/380914
Trust: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
gopherbot pushed a commit that referenced this issue Jan 26, 2022
C archives for packages in GOROOT are shipped along with binary
releases of the Go toolchain. Although we build the toolchain with
GOROOT_FINAL set, we don't know actually know where the release will
be installed: the user's real GOROOT can differ arbitrarily from our
GOROOT_FINAL.

(In the specific case of toolchains installed through golang.org/dl
wrappers, the release's GOROOT_FINAL is /usr/local/go but the actual
GOROOT to which the release is installed is
$HOME/sdk/$(go env GOVERSION).)

Fixes #50183
Updates #48319

Change-Id: If10a42f90c725300bbcb89c3b5b01a2d93ab6ef7
Reviewed-on: https://go-review.googlesource.com/c/go/+/380915
Trust: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
@dmitshur dmitshur added NeedsFix The path to resolution is known, but the work has not been done. and removed NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. labels Jan 28, 2022
jproberts pushed a commit to jproberts/go that referenced this issue Jun 21, 2022
…property

The test previously checked that the DWARF DW_AT_comp_dir attribute
matched GOROOT_FINAL. However, on further consideration, we believe
that DW_AT_comp_dir should not actually match GOROOT_FINAL: the DWARF
spec says that DW_AT_comp_dir records “the current working directory
of the compilation command that produced this compilation unit”, but
the actual working directory of the compilation command proper is a
throwaway directory in the build cache — it is neither stable nor
meaningful.

However, the test was getting at a real issue that we do care about:
namely, that the binary produced by a 'go build' command with cgo
enabled should not reuse a dependency that embeds a stale
GOROOT_FINAL.

This change refactors the test to verify the latter property instead
of checking DW_AT_comp_dir specifically.

For golang#50183
Updates golang#48319

Change-Id: I0b1151d9ba3d0ff903f72e27850306406e5cb518
Reviewed-on: https://go-review.googlesource.com/c/go/+/380914
Trust: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
jproberts pushed a commit to jproberts/go that referenced this issue Jun 21, 2022
C archives for packages in GOROOT are shipped along with binary
releases of the Go toolchain. Although we build the toolchain with
GOROOT_FINAL set, we don't know actually know where the release will
be installed: the user's real GOROOT can differ arbitrarily from our
GOROOT_FINAL.

(In the specific case of toolchains installed through golang.org/dl
wrappers, the release's GOROOT_FINAL is /usr/local/go but the actual
GOROOT to which the release is installed is
$HOME/sdk/$(go env GOVERSION).)

Fixes golang#50183
Updates golang#48319

Change-Id: If10a42f90c725300bbcb89c3b5b01a2d93ab6ef7
Reviewed-on: https://go-review.googlesource.com/c/go/+/380915
Trust: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
@rsc rsc unassigned bcmills Jun 23, 2022
@golang golang locked and limited conversation to collaborators Jun 23, 2023
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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