cgo -buildmode=c-archive out ar file not current ar archive random library at macOS

[sinlov]

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

$ go version
go version go1.16.2 darwin/amd64

Does this issue reproduce with the latest release?

yes

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

go env Output

$ go env
GO111MODULE="on"
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/sinlov/Library/Caches/go-build"
GOENV="/Users/sinlov/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/sinlov/go/pkg/mod"
GONOPROXY="*.gitlab.com,*.gitea.com"
GONOSUMDB="*.gitlab.com,*.gitea.com"
GOOS="darwin"
GOPATH="/Users/sinlov/go"
GOPRIVATE="*.gitlab.com,*.gitea.com"
GOPROXY="https://goproxy.cn,direct"
GOROOT="/usr/local/opt/go/libexec"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/opt/go/libexec/pkg/tool/darwin_amd64"
GOVCS=""
GOVERSION="go1.16.2"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/Users/sinlov/go/src/github.com/sinlov/cgo-compile-test/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 -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/tm/2y07gxzj72x_nc91rxq7w9_80000gn/T/go-build766165709=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

compile simpleness cgo with mode -buildmode=c-archive

go build args

CGO_ENABLED=1 GOOS=darwin GOARCH=amd64 go build -ldflags "-w" -x -v -buildmode=c-archive

code at https://github.com/sinlov/cgo-compile-test

What did you expect to see?

$ make
...

file test.a
test.a: current ar archive random library

What did you see instead?

$ make
...

file test.a
test.a: current ar archive

go build Output

$ make
CGO_ENABLED=1 GOOS=darwin GOARCH=amd64 \
        go build -ldflags "-w" -x -v -buildmode=c-archive \
        -o test.a
WORK=/var/folders/tm/2y07gxzj72x_nc91rxq7w9_80000gn/T/go-build1896598438
runtime/cgo
mkdir -p $WORK/b003/
cd /usr/local/opt/go/libexec/src/runtime/cgo
TERM='dumb' CGO_LDFLAGS='"-g" "-O2" "-lpthread"' /usr/local/opt/go/libexec/pkg/tool/darwin_amd64/cgo -objdir $WORK/b003/ -importpath runtime/cgo -import_runtime_cgo=false -import_syscall=false -exportheader=$WORK/b003/_cgo_install.h -- -I $WORK/b003/ -g -O2 -Wno-nullability-completeness -Wall -Werror ./cgo.go
cd $WORK
clang -fno-caret-diagnostics -c -x c - -o /dev/null || true
clang -Qunused-arguments -c -x c - -o /dev/null || true
clang -fdebug-prefix-map=a=b -c -x c - -o /dev/null || true
clang -gno-record-gcc-switches -c -x c - -o /dev/null || true
cd $WORK/b003
TERM='dumb' clang -I /usr/local/opt/go/libexec/src/runtime/cgo -fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=$WORK/b003=/tmp/go-build -gno-record-gcc-switches -fno-common -I ./ -g -O2 -Wno-nullability-completeness -Wall -Werror -o ./_x001.o -c _cgo_export.c
TERM='dumb' clang -I /usr/local/opt/go/libexec/src/runtime/cgo -fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=$WORK/b003=/tmp/go-build -gno-record-gcc-switches -fno-common -I ./ -g -O2 -Wno-nullability-completeness -Wall -Werror -o ./_x002.o -c cgo.cgo2.c
cd /usr/local/opt/go/libexec/src/runtime/cgo
TERM='dumb' clang -I . -fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=$WORK/b003=/tmp/go-build -gno-record-gcc-switches -fno-common -I $WORK/b003/ -g -O2 -Wno-nullability-completeness -Wall -Werror -o $WORK/b003/_x003.o -c gcc_context.c
TERM='dumb' clang -I . -fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=$WORK/b003=/tmp/go-build -gno-record-gcc-switches -fno-common -I $WORK/b003/ -g -O2 -Wno-nullability-completeness -Wall -Werror -o $WORK/b003/_x004.o -c gcc_darwin_amd64.c
TERM='dumb' clang -I . -fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=$WORK/b003=/tmp/go-build -gno-record-gcc-switches -fno-common -I $WORK/b003/ -g -O2 -Wno-nullability-completeness -Wall -Werror -o $WORK/b003/_x005.o -c gcc_libinit.c
TERM='dumb' clang -I . -fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=$WORK/b003=/tmp/go-build -gno-record-gcc-switches -fno-common -I $WORK/b003/ -g -O2 -Wno-nullability-completeness -Wall -Werror -o $WORK/b003/_x006.o -c gcc_setenv.c
TERM='dumb' clang -I . -fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=$WORK/b003=/tmp/go-build -gno-record-gcc-switches -fno-common -I $WORK/b003/ -g -O2 -Wno-nullability-completeness -Wall -Werror -o $WORK/b003/_x007.o -c gcc_traceback.c
TERM='dumb' clang -I . -fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=$WORK/b003=/tmp/go-build -gno-record-gcc-switches -fno-common -I $WORK/b003/ -g -O2 -Wno-nullability-completeness -Wall -Werror -o $WORK/b003/_x008.o -c gcc_util.c
TERM='dumb' clang -I . -fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=$WORK/b003=/tmp/go-build -gno-record-gcc-switches -fno-common -I $WORK/b003/ -g -O2 -Wno-nullability-completeness -Wall -Werror -o $WORK/b003/_x009.o -c gcc_amd64.S
cd $WORK/b003
TERM='dumb' clang -I /usr/local/opt/go/libexec/src/runtime/cgo -fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=$WORK/b003=/tmp/go-build -gno-record-gcc-switches -fno-common -I ./ -g -O2 -Wno-nullability-completeness -Wall -Werror -o ./_cgo_main.o -c _cgo_main.c
cd /Users/sinlov/go/src/github.com/sinlov/cgo-compile-test
TERM='dumb' clang -I /usr/local/opt/go/libexec/src/runtime/cgo -fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=$WORK/b003=/tmp/go-build -gno-record-gcc-switches -fno-common -o $WORK/b003/_cgo_.o $WORK/b003/_cgo_main.o $WORK/b003/_x001.o $WORK/b003/_x002.o $WORK/b003/_x003.o $WORK/b003/_x004.o $WORK/b003/_x005.o $WORK/b003/_x006.o $WORK/b003/_x007.o $WORK/b003/_x008.o $WORK/b003/_x009.o -g -O2 -lpthread
TERM='dumb' /usr/local/opt/go/libexec/pkg/tool/darwin_amd64/cgo -dynpackage cgo -dynimport $WORK/b003/_cgo_.o -dynout $WORK/b003/_cgo_import.go -dynlinker
github.com/sinlov/cgo-compile-test
mkdir -p $WORK/b001/
TERM='dumb' CGO_LDFLAGS='"-g" "-O2"' /usr/local/opt/go/libexec/pkg/tool/darwin_amd64/cgo -objdir $WORK/b001/ -importpath github.com/sinlov/cgo-compile-test -exportheader=$WORK/b001/_cgo_install.h -- -I $WORK/b001/ -g -O2 ./test.go
cd $WORK/b001
TERM='dumb' clang -I /Users/sinlov/go/src/github.com/sinlov/cgo-compile-test -fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -fno-common -I ./ -g -O2 -o ./_x001.o -c _cgo_export.c
TERM='dumb' clang -I /Users/sinlov/go/src/github.com/sinlov/cgo-compile-test -fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -fno-common -I ./ -g -O2 -o ./_x002.o -c test.cgo2.c
cd /Users/sinlov/go/src/github.com/sinlov/cgo-compile-test
TERM='dumb' clang -I . -fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -fno-common -I $WORK/b001/ -g -O2 -o $WORK/b001/_x003.o -c test.c
cd $WORK/b001
TERM='dumb' clang -I /Users/sinlov/go/src/github.com/sinlov/cgo-compile-test -fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -fno-common -I ./ -g -O2 -o ./_cgo_main.o -c _cgo_main.c
cd /Users/sinlov/go/src/github.com/sinlov/cgo-compile-test
TERM='dumb' clang -I . -fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=$WORK/b001=/tmp/go-build -gno-record-gcc-switches -fno-common -o $WORK/b001/_cgo_.o $WORK/b001/_cgo_main.o $WORK/b001/_x001.o $WORK/b001/_x002.o $WORK/b001/_x003.o -g -O2
TERM='dumb' /usr/local/opt/go/libexec/pkg/tool/darwin_amd64/cgo -dynpackage main -dynimport $WORK/b001/_cgo_.o -dynout $WORK/b001/_cgo_import.go
cat >$WORK/b001/importcfg.link << 'EOF' # internal
packagefile github.com/sinlov/cgo-compile-test=/Users/sinlov/Library/Caches/go-build/b2/b2db1fef79f3c9f737d7f56e4495b56bf47a6f77696afeada7c3520e9f7bc673-d
packagefile runtime/cgo=/usr/local/opt/go/libexec/pkg/darwin_amd64/runtime/cgo.a
packagefile syscall=/usr/local/opt/go/libexec/pkg/darwin_amd64/syscall.a
packagefile runtime=/usr/local/opt/go/libexec/pkg/darwin_amd64/runtime.a
packagefile errors=/usr/local/opt/go/libexec/pkg/darwin_amd64/errors.a
packagefile internal/bytealg=/usr/local/opt/go/libexec/pkg/darwin_amd64/internal/bytealg.a
packagefile internal/oserror=/usr/local/opt/go/libexec/pkg/darwin_amd64/internal/oserror.a
packagefile internal/race=/usr/local/opt/go/libexec/pkg/darwin_amd64/internal/race.a
packagefile internal/unsafeheader=/usr/local/opt/go/libexec/pkg/darwin_amd64/internal/unsafeheader.a
packagefile sync=/usr/local/opt/go/libexec/pkg/darwin_amd64/sync.a
packagefile internal/cpu=/usr/local/opt/go/libexec/pkg/darwin_amd64/internal/cpu.a
packagefile runtime/internal/atomic=/usr/local/opt/go/libexec/pkg/darwin_amd64/runtime/internal/atomic.a
packagefile runtime/internal/math=/usr/local/opt/go/libexec/pkg/darwin_amd64/runtime/internal/math.a
packagefile runtime/internal/sys=/usr/local/opt/go/libexec/pkg/darwin_amd64/runtime/internal/sys.a
packagefile internal/reflectlite=/usr/local/opt/go/libexec/pkg/darwin_amd64/internal/reflectlite.a
packagefile sync/atomic=/usr/local/opt/go/libexec/pkg/darwin_amd64/sync/atomic.a
EOF
mkdir -p $WORK/b001/exe/
cd .
/usr/local/opt/go/libexec/pkg/tool/darwin_amd64/link -o $WORK/b001/exe/a.out.a -importcfg $WORK/b001/importcfg.link -buildmode=c-archive -buildid=GQgLEw2NNKSfGEpQ0X-r/VQDz2ODp5rNZWw3EAb92/1Koj8_yhn6nSb56-DPwb/GQgLEw2NNKSfGEpQ0X-r -w -extld=clang /Users/sinlov/Library/Caches/go-build/b2/b2db1fef79f3c9f737d7f56e4495b56bf47a6f77696afeada7c3520e9f7bc673-d
/usr/local/opt/go/libexec/pkg/tool/darwin_amd64/buildid -w $WORK/b001/exe/a.out.a # internal
# $WORK/b001/_cgo_install.h not created
mv $WORK/b001/exe/a.out.a test.a
rm -r $WORK/b001/
file test.a

test.a: current ar archive

objdump -a test.a

In archive test.a:
go.o:     file format mach-o-x86-64

rw-r--r-- 0/0 1058800 Jan  1 08:00 1970 go.o
000000.o:     file format mach-o-x86-64

rw-r--r-- 0/0    680 Jan  1 08:00 1970 000000.o
000001.o:     file format mach-o-x86-64

rw-r--r-- 0/0   2420 Jan  1 08:00 1970 000001.o
000002.o:     file format mach-o-x86-64

rw-r--r-- 0/0   2084 Jan  1 08:00 1970 000002.o
000003.o:     file format mach-o-x86-64

rw-r--r-- 0/0    680 Jan  1 08:00 1970 000003.o
000004.o:     file format mach-o-x86-64

rw-r--r-- 0/0    680 Jan  1 08:00 1970 000004.o
000005.o:     file format mach-o-x86-64

rw-r--r-- 0/0   2864 Jan  1 08:00 1970 000005.o
000006.o:     file format mach-o-x86-64

rw-r--r-- 0/0   7776 Jan  1 08:00 1970 000006.o
000007.o:     file format mach-o-x86-64

rw-r--r-- 0/0  10168 Jan  1 08:00 1970 000007.o
000008.o:     file format mach-o-x86-64

rw-r--r-- 0/0   2852 Jan  1 08:00 1970 000008.o
000009.o:     file format mach-o-x86-64

rw-r--r-- 0/0   3200 Jan  1 08:00 1970 000009.o
000010.o:     file format mach-o-x86-64

rw-r--r-- 0/0   3820 Jan  1 08:00 1970 000010.o
000011.o:     file format mach-o-x86-64

rw-r--r-- 0/0   1080 Jan  1 08:00 1970 000011.o

[seankhliao]

I can't reproduce this

[gopherbot]

Timed out in state WaitingForInfo. Closing.

(I am just a bot, though. Please speak up if this is a mistake or you have the requested information.)