cmd/link: system linker warnings on macOS 10.14 when using cgo

[tjamet]

What version of Go are you using (go version)?

$ go version
go version go1.13.5 darwin/amd64

Does this issue reproduce with the latest release?

yes, in fact, is has been introduced by the latest release

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

go env Output

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/thibault/Library/Caches/go-build"
GOENV="/Users/thibault/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GONOPROXY="[REDACTED]"
GONOSUMDB="[REDACTED]"
GOOS="darwin"
GOPATH="/Users/thibault/go/"
GOPRIVATE="[REDACTED]"
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/Users/thibault/go/src/github.com/tjamet/gotiff/go.mod"
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 -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/dt/lz9gptg91vzchq7zp5grt85h0000gn/T/go-build152848555=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

Install go 1.13.5 from official release using the installer. This replaced my previously installed version

Then, I ran a program, I had previously run using go 1.13.1 using go run main.go, importing the sqlite package, using CGO

Here is the snippet that reproduces the problem:

package main

import (
	"database/sql"
	"log"

	_ "github.com/mattn/go-sqlite3"
)

func main() {
	db, err := sql.Open("sqlite3", "test.db")
	if err != nil {
		log.Fatalln("could not open database:", err)
	}
	defer db.Close()
}

What did you expect to see?

No output on stdout/stderr.
This output was not shown with my system (10.14.6 (18G95)) using go 1.13.1
I am unsure the issue is linked to go or to go-sqlite3

What did you see instead?

When running the run command, or the go build command, I have the following output:

# command-line-arguments
ld: warning: object file (/var/folders/dt/lz9gptg91vzchq7zp5grt85h0000gn/T/go-link-937073420/000012.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/dt/lz9gptg91vzchq7zp5grt85h0000gn/T/go-link-937073420/000013.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/dt/lz9gptg91vzchq7zp5grt85h0000gn/T/go-link-937073420/000014.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/dt/lz9gptg91vzchq7zp5grt85h0000gn/T/go-link-937073420/000015.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/dt/lz9gptg91vzchq7zp5grt85h0000gn/T/go-link-937073420/000016.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/dt/lz9gptg91vzchq7zp5grt85h0000gn/T/go-link-937073420/000017.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/dt/lz9gptg91vzchq7zp5grt85h0000gn/T/go-link-937073420/000018.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/dt/lz9gptg91vzchq7zp5grt85h0000gn/T/go-link-937073420/000019.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/dt/lz9gptg91vzchq7zp5grt85h0000gn/T/go-link-937073420/000020.o) was built for newer OSX version (10.15) than being linked (10.14)

[ianlancetaylor]

CC @andybons @dmitshur

Is anybody else seeing this? Did we build the 1.13.5 release on macOS 10.15?

@tjamet Do you see this problem with other Go programs?

[andybons]

@ianlancetaylor the release is built on 10.15, yes. It may be that we need to explicitly set a target of macOS when building. See #35459.

@cagedmantis @toothrot

[andybons]

@tjamet can you provide the output of go build -x?

[networkimprov]

Looks like a dup of #22281 & #35193 & #33968

@eliasnaur @odeke-em

[tjamet]

indeed, it looks very much like a duplicate of those tickets. Sorry about that!
I didn't see the problem with other programs @ianlancetaylor I am not using CGO for any other program though.

here is the output of go build -x

mkdir -p $WORK/b001/
cat >$WORK/b001/importcfg.link << 'EOF' # internal
packagefile command-line-arguments=/Users/thibault/Library/Caches/go-build/8b/8b55a428107aaee0aeb04dbd587b78f8591105cf4efaadbbfdd8ea1e47ebbc0d-d
packagefile database/sql=/usr/local/go/pkg/darwin_amd64/database/sql.a
packagefile github.com/mattn/go-sqlite3=/Users/thibault/Library/Caches/go-build/62/625d875525aa67b6968cdde27e0b741576d49506c84aa2445d2b46695be60ef7-d
packagefile log=/usr/local/go/pkg/darwin_amd64/log.a
packagefile runtime=/usr/local/go/pkg/darwin_amd64/runtime.a
packagefile context=/usr/local/go/pkg/darwin_amd64/context.a
packagefile database/sql/driver=/usr/local/go/pkg/darwin_amd64/database/sql/driver.a
packagefile errors=/usr/local/go/pkg/darwin_amd64/errors.a
packagefile fmt=/usr/local/go/pkg/darwin_amd64/fmt.a
packagefile io=/usr/local/go/pkg/darwin_amd64/io.a
packagefile reflect=/usr/local/go/pkg/darwin_amd64/reflect.a
packagefile sort=/usr/local/go/pkg/darwin_amd64/sort.a
packagefile strconv=/usr/local/go/pkg/darwin_amd64/strconv.a
packagefile sync=/usr/local/go/pkg/darwin_amd64/sync.a
packagefile sync/atomic=/usr/local/go/pkg/darwin_amd64/sync/atomic.a
packagefile time=/usr/local/go/pkg/darwin_amd64/time.a
packagefile unicode=/usr/local/go/pkg/darwin_amd64/unicode.a
packagefile unicode/utf8=/usr/local/go/pkg/darwin_amd64/unicode/utf8.a
packagefile crypto/sha1=/usr/local/go/pkg/darwin_amd64/crypto/sha1.a
packagefile crypto/sha256=/usr/local/go/pkg/darwin_amd64/crypto/sha256.a
packagefile crypto/sha512=/usr/local/go/pkg/darwin_amd64/crypto/sha512.a
packagefile math=/usr/local/go/pkg/darwin_amd64/math.a
packagefile net/url=/usr/local/go/pkg/darwin_amd64/net/url.a
packagefile strings=/usr/local/go/pkg/darwin_amd64/strings.a
packagefile runtime/cgo=/usr/local/go/pkg/darwin_amd64/runtime/cgo.a
packagefile syscall=/usr/local/go/pkg/darwin_amd64/syscall.a
packagefile os=/usr/local/go/pkg/darwin_amd64/os.a
packagefile internal/bytealg=/usr/local/go/pkg/darwin_amd64/internal/bytealg.a
packagefile internal/cpu=/usr/local/go/pkg/darwin_amd64/internal/cpu.a
packagefile runtime/internal/atomic=/usr/local/go/pkg/darwin_amd64/runtime/internal/atomic.a
packagefile runtime/internal/math=/usr/local/go/pkg/darwin_amd64/runtime/internal/math.a
packagefile runtime/internal/sys=/usr/local/go/pkg/darwin_amd64/runtime/internal/sys.a
packagefile internal/reflectlite=/usr/local/go/pkg/darwin_amd64/internal/reflectlite.a
packagefile internal/fmtsort=/usr/local/go/pkg/darwin_amd64/internal/fmtsort.a
packagefile math/bits=/usr/local/go/pkg/darwin_amd64/math/bits.a
packagefile internal/race=/usr/local/go/pkg/darwin_amd64/internal/race.a
packagefile crypto=/usr/local/go/pkg/darwin_amd64/crypto.a
packagefile encoding/binary=/usr/local/go/pkg/darwin_amd64/encoding/binary.a
packagefile hash=/usr/local/go/pkg/darwin_amd64/hash.a
packagefile internal/oserror=/usr/local/go/pkg/darwin_amd64/internal/oserror.a
packagefile internal/poll=/usr/local/go/pkg/darwin_amd64/internal/poll.a
packagefile internal/syscall/unix=/usr/local/go/pkg/darwin_amd64/internal/syscall/unix.a
packagefile internal/testlog=/usr/local/go/pkg/darwin_amd64/internal/testlog.a
EOF
mkdir -p $WORK/b001/exe/
cd .
/usr/local/go/pkg/tool/darwin_amd64/link -o $WORK/b001/exe/a.out -importcfg $WORK/b001/importcfg.link -buildmode=exe -buildid=wEANusrRlE4PWCHXqU7k/6MHzcFQa7XackiClGHR7/zuSDETUaEJrB7Vx2l-Qq/wEANusrRlE4PWCHXqU7k -extld=clang /Users/thibault/Library/Caches/go-build/8b/8b55a428107aaee0aeb04dbd587b78f8591105cf4efaadbbfdd8ea1e47ebbc0d-d
/usr/local/go/pkg/tool/darwin_amd64/buildid -w $WORK/b001/exe/a.out # internal
# command-line-arguments
ld: warning: object file (/var/folders/dt/lz9gptg91vzchq7zp5grt85h0000gn/T/go-link-168878093/000012.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/dt/lz9gptg91vzchq7zp5grt85h0000gn/T/go-link-168878093/000013.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/dt/lz9gptg91vzchq7zp5grt85h0000gn/T/go-link-168878093/000014.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/dt/lz9gptg91vzchq7zp5grt85h0000gn/T/go-link-168878093/000015.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/dt/lz9gptg91vzchq7zp5grt85h0000gn/T/go-link-168878093/000016.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/dt/lz9gptg91vzchq7zp5grt85h0000gn/T/go-link-168878093/000017.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/dt/lz9gptg91vzchq7zp5grt85h0000gn/T/go-link-168878093/000018.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/dt/lz9gptg91vzchq7zp5grt85h0000gn/T/go-link-168878093/000019.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/dt/lz9gptg91vzchq7zp5grt85h0000gn/T/go-link-168878093/000020.o) was built for newer OSX version (10.15) than being linked (10.14)
mv $WORK/b001/exe/a.out main
rm -r $WORK/b001/

[toothrot]

I don't have a mac machine handy (and am just learning the x/build/cmd/release code), but is setting MACOSX_DEPLOYMENT_TARGET in x/build/dashboard/builders.go#L528 sufficient?

Edit: I'll work on answering this question

[mariusgrigoriu]

Also experiencing this on MacOS 10.14 with Go 1.13.5 with cgo on a different project. Downgrading to Go 1.13.4 makes the warnings go away.

[richard-mauri]

I also am experiencing this on MaxOS 10.14.6 with go1.13.5
Downgrading to go1.13.4 makes the warnings go away

$ go version
go version go1.13.5 darwin/amd64

$ go build -o ./bin/darwin/encompassbeat -x  main.go
WORK=/var/folders/s0/g6ny6y0d5ss2fcspmcfhzfxn41wtqr/T/go-build282330584
cat /Users/rmauri/Library/Caches/go-build/e8/e8bbe37f80f74a7fd8d266dcbdc46a831422aa01c21cb85e9bb3f6ff9e1af029-d  # internal
# command-line-arguments
ld: warning: object file (/var/folders/s0/g6ny6y0d5ss2fcspmcfhzfxn41wtqr/T/go-link-812475010/000000.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/s0/g6ny6y0d5ss2fcspmcfhzfxn41wtqr/T/go-link-812475010/000001.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/s0/g6ny6y0d5ss2fcspmcfhzfxn41wtqr/T/go-link-812475010/000002.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/s0/g6ny6y0d5ss2fcspmcfhzfxn41wtqr/T/go-link-812475010/000003.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/s0/g6ny6y0d5ss2fcspmcfhzfxn41wtqr/T/go-link-812475010/000004.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/s0/g6ny6y0d5ss2fcspmcfhzfxn41wtqr/T/go-link-812475010/000009.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/s0/g6ny6y0d5ss2fcspmcfhzfxn41wtqr/T/go-link-812475010/000010.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/s0/g6ny6y0d5ss2fcspmcfhzfxn41wtqr/T/go-link-812475010/000015.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/s0/g6ny6y0d5ss2fcspmcfhzfxn41wtqr/T/go-link-812475010/000016.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/s0/g6ny6y0d5ss2fcspmcfhzfxn41wtqr/T/go-link-812475010/000017.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/s0/g6ny6y0d5ss2fcspmcfhzfxn41wtqr/T/go-link-812475010/000018.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/s0/g6ny6y0d5ss2fcspmcfhzfxn41wtqr/T/go-link-812475010/000019.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/s0/g6ny6y0d5ss2fcspmcfhzfxn41wtqr/T/go-link-812475010/000020.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/s0/g6ny6y0d5ss2fcspmcfhzfxn41wtqr/T/go-link-812475010/000021.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/s0/g6ny6y0d5ss2fcspmcfhzfxn41wtqr/T/go-link-812475010/000022.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/s0/g6ny6y0d5ss2fcspmcfhzfxn41wtqr/T/go-link-812475010/000023.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/s0/g6ny6y0d5ss2fcspmcfhzfxn41wtqr/T/go-link-812475010/000024.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/s0/g6ny6y0d5ss2fcspmcfhzfxn41wtqr/T/go-link-812475010/000025.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/s0/g6ny6y0d5ss2fcspmcfhzfxn41wtqr/T/go-link-812475010/000026.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/s0/g6ny6y0d5ss2fcspmcfhzfxn41wtqr/T/go-link-812475010/000027.o) was built for newer OSX version (10.15) than being linked (10.14)
ld: warning: object file (/var/folders/s0/g6ny6y0d5ss2fcspmcfhzfxn41wtqr/T/go-link-812475010/go.o) was built for newer OSX version (10.15) than being linked (10.14)```

[medyagh]

I have the same problem

$ go version
go version go1.13.5 darwin/amd64

[JasonZhang95]

also met this problem

# command-line-arguments ld: warning: object file (/var/folders/sw/lgrvgk450ld5bvskc749btb80000gp/T/go-link-242272134/000000.o) was built for newer OSX version (10.15) than being linked (10.14) ld: warning: object file (/var/folders/sw/lgrvgk450ld5bvskc749btb80000gp/T/go-link-242272134/000001.o) was built for newer OSX version (10.15) than being linked (10.14) ld: warning: object file (/var/folders/sw/lgrvgk450ld5bvskc749btb80000gp/T/go-link-242272134/000002.o) was built for newer OSX version (10.15) than being linked (10.14) ld: warning: object file (/var/folders/sw/lgrvgk450ld5bvskc749btb80000gp/T/go-link-242272134/000003.o) was built for newer OSX version (10.15) than being linked (10.14) ld: warning: object file (/var/folders/sw/lgrvgk450ld5bvskc749btb80000gp/T/go-link-242272134/000004.o) was built for newer OSX version (10.15) than being linked (10.14) ld: warning: object file (/var/folders/sw/lgrvgk450ld5bvskc749btb80000gp/T/go-link-242272134/go.o) was built for newer OSX version (10.15) than being linked (10.14) ld: warning: object file (/var/folders/sw/lgrvgk450ld5bvskc749btb80000gp/T/go-link-242272134/000005.o) was built for newer OSX version (10.15) than being linked (10.14) ld: warning: object file (/var/folders/sw/lgrvgk450ld5bvskc749btb80000gp/T/go-link-242272134/000006.o) was built for newer OSX version (10.15) than being linked (10.14) ld: warning: object file (/var/folders/sw/lgrvgk450ld5bvskc749btb80000gp/T/go-link-242272134/000007.o) was built for newer OSX version (10.15) than being linked (10.14) ld: warning: object file (/var/folders/sw/lgrvgk450ld5bvskc749btb80000gp/T/go-link-242272134/000008.o) was built for newer OSX version (10.15) than being linked (10.14) ld: warning: object file (/var/folders/sw/lgrvgk450ld5bvskc749btb80000gp/T/go-link-242272134/000009.o) was built for newer OSX version (10.15) than being linked (10.14) ld: warning: object file (/var/folders/sw/lgrvgk450ld5bvskc749btb80000gp/T/go-link-242272134/000010.o) was built for newer OSX version (10.15) than being linked (10.14) ld: warning: object file (/var/folders/sw/lgrvgk450ld5bvskc749btb80000gp/T/go-link-242272134/000011.o) was built for newer OSX version (10.15) than being linked (10.14) ld: warning: object file (/var/folders/sw/lgrvgk450ld5bvskc749btb80000gp/T/go-link-242272134/000012.o) was built for newer OSX version (10.15) than being linked (10.14) ld: warning: object file (/var/folders/sw/lgrvgk450ld5bvskc749btb80000gp/T/go-link-242272134/000013.o) was built for newer OSX version (10.15) than being linked (10.14) ld: warning: object file (/var/folders/sw/lgrvgk450ld5bvskc749btb80000gp/T/go-link-242272134/000014.o) was built for newer OSX version (10.15) than being linked (10.14)