cmd/link: ld warnings when upgrading to 1.9 on macOS

[buchanae]

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

1.8.4 upgrading to 1.9.1

Does this issue reproduce with the latest release?

Yes

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

GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/buchanae"
GORACE=""
GOROOT="/usr/local/go"
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/kw/m6dz8snx7h33ppbkbllnqt48bkhsqx/T/go-build472819290=/tmp/go-build -gno-record-gcc-switches -fno-common"
CXX="clang++"
CGO_ENABLED="1"
PKG_CONFIG="pkg-config"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"

OSX 10.11.6

What did you do?

1. uninstalled the existing version of Go (1.8.4) which I had installed via homebrew
2. downloaded 1.9.1 release tarball, installed as instructed
3. built a project (github.com/ohsu-comp-bio/funnel)
4. Got the following warnings during build. Build did appear to succeed:

ld: warning: object file (/var/folders/kw/m6dz8snx7h33ppbkbllnqt48bkhsqx/T/go-link-991847961/000000.o) was built for newer OSX version (10.11) than being linked (10.10)
ld: warning: object file (/var/folders/kw/m6dz8snx7h33ppbkbllnqt48bkhsqx/T/go-link-991847961/000001.o) was built for newer OSX version (10.11) than being linked (10.10)
ld: warning: object file (/var/folders/kw/m6dz8snx7h33ppbkbllnqt48bkhsqx/T/go-link-991847961/000003.o) was built for newer OSX version (10.11) than being linked (10.10)
ld: warning: object file (/var/folders/kw/m6dz8snx7h33ppbkbllnqt48bkhsqx/T/go-link-991847961/000004.o) was built for newer OSX version (10.11) than being linked (10.10)
ld: warning: object file (/var/folders/kw/m6dz8snx7h33ppbkbllnqt48bkhsqx/T/go-link-991847961/000005.o) was built for newer OSX version (10.11) than being linked (10.10)
ld: warning: object file (/var/folders/kw/m6dz8snx7h33ppbkbllnqt48bkhsqx/T/go-link-991847961/000006.o) was built for newer OSX version (10.11) than being linked (10.10)

5. Tried deleting directories in the warnings, thinking it was a cached object from an old build. No effect.
6. Tried using the 1.9.1 installer (instead of the tarball). No effect.
7. Downgraded to 1.8.4 (installed via installer) and the warnings went away.

[ianlancetaylor]

The system linker was most likely always producing those warnings. The change from Go 1.8 to 1.9 is that in 1.8 the Go linker would hide any warnings from the system linker, whereas in Go 1.9 the warnings are shown. See #17935.

I don't know why you are getting those warnings, though.

[notnot]

I am experiencing the same issue on a OS X 10.10.5 system, after upgrading to Go1.9.2
The binaries that are built appear to work fine, so far.

[wdevore]

I am now getting these warnings OS X 10.10.5 after upgrading to Go 1.10.0

[iambudi]

I got this warning too on OSX Mojave 10.14 Beta after upgrading to golang 1.11.

[l2dy]

@iambudi You probably got hit by setting MACOSX_DEPLOYMENT_TARGET to <=10.9 in your project if you see … was built for newer OSX version (10.10) than being linked (10.9) because Go 1.11 now requires macOS 10.10 Yosemite or later.

[lsegal]

Also seeing this after upgrading from 10.12 to 10.13.

ld: warning: object file (/var/folders/vh/1kdv9jt922ddgm0r9tprx3y80000gn/T/go-link-684600122/000000.o) was built for newer OSX version (10.13) than being linked (10.12)

Is this maybe related to some kind of cache that we can dump?

[networkimprov]

@cagedmantis this can be closed; progress is being tracked on #36025

[cagedmantis]

Closing this issue since the associated work is being tracked in #36025.