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cmd/cgo: building fully statically linked executable for Android fails when cgo is enabled #59942

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leleliu008 opened this issue May 3, 2023 · 4 comments
Open

cmd/cgo: building fully statically linked executable for Android fails when cgo is enabled #59942

leleliu008 opened this issue May 3, 2023 · 4 comments
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@changkun
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compiler/runtime Issues related to the Go compiler and/or runtime. NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. OS-Android
Milestone
Unplanned

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@leleliu008
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leleliu008 commented May 3, 2023 •
edited

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

go version go1.20.3 linux/amd64

Does this issue reproduce with the latest release?

Yes

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

GO111MODULE="auto"
GOARCH="arm64"
GOBIN=""
GOCACHE="/home/leleliu008/.cache/go-build"
GOENV="/home/leleliu008/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/leleliu008/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="android"
GOPATH="/home/leleliu008/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/home/linuxbrew/.linuxbrew/Cellar/go/1.20.3/libexec"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/home/linuxbrew/.linuxbrew/Cellar/go/1.20.3/libexec/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.20.3"
GCCGO="gccgo"
AR="/home/leleliu008/.ndk-pkg/android-ndk-r23b/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-ar"
CC="/home/leleliu008/.ndk-pkg/core/bin/proxy-target-cc"
CXX="/home/leleliu008/.ndk-pkg/core/bin/proxy-target-c++"
CGO_ENABLED="1"
GOMOD="/home/leleliu008/.ndk-pkg/installing/android-31/arm64-v8a/yq/src/go.mod"
GOWORK=""
CGO_CFLAGS="--sysroot /home/leleliu008/.ndk-pkg/android-ndk-r23b/toolchains/llvm/prebuilt/linux-x86_64/sysroot -Qunused-arguments -fPIC -fno-common -Os"
CGO_CPPFLAGS="-I/home/leleliu008/.ndk-pkg/installing/android-31/arm64-v8a/yq/include --sysroot /home/leleliu008/.ndk-pkg/android-ndk-r23b/toolchains/llvm/prebuilt/linux-x86_64/sysroot -Qunused-arguments -include /home/leleliu008/.ndk-pkg/installing/android-31/arm64-v8a/yq/include/ndk-pkg-common.h -DNDEBUG"
CGO_CXXFLAGS="--sysroot /home/leleliu008/.ndk-pkg/android-ndk-r23b/toolchains/llvm/prebuilt/linux-x86_64/sysroot -Qunused-arguments -fPIC -fno-common -Os"
CGO_FFLAGS="-O2 -g"
CGO_LDFLAGS="-L/home/leleliu008/.ndk-pkg/installing/android-31/arm64-v8a/yq/lib --sysroot /home/leleliu008/.ndk-pkg/android-ndk-r23b/toolchains/llvm/prebuilt/linux-x86_64/sysroot -Wl,--as-needed -Wl,-z,muldefs -Wl,--allow-multiple-definition -static --static -ffunction-sections -fdata-sections -Wl,--gc-sections -Wl,--no-dynamic-linker -Wl,-S"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -pthread -fno-caret-diagnostics -Qunused-arguments -Wl,--no-gc-sections -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build155171888=/tmp/go-build -gno-record-gcc-switches"

What did you do?

go build -trimpath -v -ldflags ' -s -w -linkmode external "-extldflags=-static"' -tags release

What did you expect to see?

successfully built

What did you see instead?

/home/linuxbrew/.linuxbrew/Cellar/go/1.20.3/libexec/pkg/tool/linux_amd64/link: running /home/leleliu008/.ndk-pkg/core/bin/proxy-target-cc failed: exit status 1
ld: error: undefined symbol: __android_log_vprint
>>> referenced by gcc_android.c
>>>               /tmp/go-link-1481358754/000008.o:(fatalf)

ld: error: undefined symbol: dlopen
>>> referenced by gcc_android.c
>>>               /tmp/go-link-1481358754/000008.o:(inittls)

ld: error: undefined symbol: dlsym
>>> referenced by gcc_android.c
>>>               /tmp/go-link-1481358754/000008.o:(inittls)

ld: error: undefined symbol: dlclose
>>> referenced by gcc_android.c
>>>               /tmp/go-link-1481358754/000008.o:(inittls)
clang-12: error: linker command failed with exit code 1 (use -v to see invocation)

more

https://github.com/golang/go/blob/master/src/runtime/cgo/gcc_android.c

gcc_android.c rely on liblog.so and libdl.so

Note: Android NDK do not provides liblog.a

statically linked executable can not use functions in libdl.

to get runtime os SDK API Level, I usually use follwoing code:

char buff[PROP_VALUE_MAX];

int n = __system_property_get("ro.build.version.sdk", buff);

if (n > 0) {
    return 0;
} else {
    return -1; 
}
@leleliu008 leleliu008 changed the title affected/package: runtime/cgo build fully stattically linked executable is failed when cgo is enabled affected/package: runtime/cgo build fully stattically linked executable for Android is failed when cgo is enabled May 3, 2023
@leleliu008 leleliu008 changed the title affected/package: runtime/cgo build fully stattically linked executable for Android is failed when cgo is enabled affected/package: runtime/cgo build fully statically linked executable for Android is failed when cgo is enabled May 3, 2023
@cagedmantis cagedmantis added this to the Backlog milestone May 3, 2023
@cagedmantis cagedmantis added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label May 3, 2023
@cagedmantis cagedmantis changed the title affected/package: runtime/cgo build fully statically linked executable for Android is failed when cgo is enabled cmd/cgo: building fully statically linked executable for Android is failed when cgo is enabled May 3, 2023
@gopherbot gopherbot added the compiler/runtime Issues related to the Go compiler and/or runtime. label May 3, 2023
@bcmills
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bcmills commented May 4, 2023

(CC @golang/android)

@mknyszek mknyszek changed the title cmd/cgo: building fully statically linked executable for Android is failed when cgo is enabled cmd/cgo: building fully statically linked executable for Android fails when cgo is enabled May 10, 2023
@mknyszek mknyszek modified the milestones: Backlog, Unplanned May 10, 2023
@mknyszek
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In triage, we're not sure if building a fully static Android executable is supported. Assigned to the only person in @golang/android for more thoughts and details.

@leleliu008
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Android command-line app can be built as fully statically linked executable or position independent dynamically linked execuable.

Android apk only use dynamically linked library.

It would be cool if this feature could be implemented.

@leleliu008
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Rust don't support building as fully stattically linked executable for Android as well, but I can hack it. rust-lang/cargo#10765

I din't find a way to do so for golang.

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@changkun changkun

Labels
compiler/runtime Issues related to the Go compiler and/or runtime. NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. OS-Android
Projects
Go Compiler / Runtime
Status: Todo
Milestone
Unplanned
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6 participants
@cagedmantis @mknyszek @leleliu008 @bcmills @changkun @gopherbot