Missing linker/linker64 ELF

[She Bu (BuShe)]

I am trying to compile a certain project for Android cross-platform using Android NDK on Ubuntu platform and I am getting the following error:

qemu-aarch64: Could not open '/system/bin/linker64': No such file or directory

I checked https://android.googlesource.com/platform/bionic/ and got some information.

So is there a way to use linker/linker64 on the Ubuntu platform?

[enh]

that means you're trying to _run_ an Android executable on your host.
you don't want to do that. you'll want to make sure you're
cross-compiling correctly (and may have to fix the project so that it
doesn't try to run executables locally when cross-compiling).

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[John Dallman]

Could you explain a bit more what you're trying to do? 

/system/bin/linker and /system/bin/linker64 are the 32-bit and 64-bit loaders on an Android device. Their job is to start a process. They should not be involved with compiling or linking software for Android; they're only used when it is to be run. 

They're called "linker" because they do the job of putting a process together from an executable and shared libraries. "Dynamic  linker" is a more accurate term for them. They're separate from the kind of linker which reads .o object files and builds an executable or a shared library. 

John

--

[She Bu (BuShe)]

Thanks for getting back to me,

I know what is linker/linker64 runs on Android device.

I can point directly to this problem occurring in building Node.js for the Android platform (especially for the ARM architecture). 

Using arm64 as the target architecture, for example, during some cross-compilation process the build produced a binary, icupkg: ELF 64-bit LSB pie executable ... interrupter /system/bin/linker64 .... 

And qemu-aarch64 needs to execute this binary, so it needs linker64. 

We tried to copy linker64 from the Android device to the appropriate path, and the project compiled.

[enh]

On Mon, Feb 5, 2024 at 11:29 AM She Bu <guzheny...@gmail.com> wrote:
>
> Thanks for getting back to me,
>
> I know what is linker/linker64 runs on Android device.
>
> I can point directly to this problem occurring in building Node.js for the Android platform (especially for the ARM architecture).
>
> Using arm64 as the target architecture, for example, during some cross-compilation process the build produced a binary, icupkg: ELF 64-bit LSB pie executable ... interrupter /system/bin/linker64 ....
>
> And qemu-aarch64 needs to execute this binary, so it needs linker64.
>
> We tried to copy linker64 from the Android device to the appropriate path, and the project compiled.

yes, but it probably got the wrong results --- typically when a
generated binary is run during a build, it's for a configure-style
test. if you're running the wrong architecture/OS binary, you'll get a
"fail" that doesn't actually represent what's available on the device.
this is a classic mistake when people haven't taken cross-compilation
into account. you'll want to check the resulting configuration and/or
talk to the maintainer of the build about fixing it for
cross-compilation.

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>
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