Re: Are user static builds really dynamically linked ?

[Paolo Bonzini <pbonzini@redhat.com>]

On 16/12/20 12:07, Peter Maydell wrote:
> On Wed, 16 Dec 2020 at 06:39, Tj (Elloe Linux) <ml.linux@elloe.vision> wrote:
>>
>> user --static builds are apparently resulting in dynamically linked
>> executables (to the glibc library, not other shared objects )
> 
> I think you mean that you end up with an executable that's
> dynamically linked but although it requires the dynamic
> linker (ld.so) it has an empty list of dynamic libraries
> (ie not even glibc).
> 
>> Concise summary:
>>
>> $ file ../qemu-aarch64_v*
>>
>> ../qemu-aarch64_v4.2.1: ELF 64-bit LSB executable, x86-64, version 1
>> (GNU/Linux), statically linked,
>> BuildID[sha1]=70f5e10ac0eb9b63d7758850e2f18d0a047d4b79, for GNU/Linux
>> 3.2.0, with debug_info, not stripped
>>
>> ../qemu-aarch64_v5.2:   ELF 64-bit LSB shared object, x86-64, version 1
>> (GNU/Linux), dynamically linked,
>> BuildID[sha1]=91fda2fa08f46d1bb6d19b6f72a4819a7c20fd7e, for GNU/Linux
>> 3.2.0, stripped
>>
>> $ ldd  ../qemu-aarch64_v*
>>
>> ../qemu-aarch64_v4.2.1:
>>          not a dynamic executable
>> ../qemu-aarch64_v5.2:
>>          statically linked
> 
> Something has definitely changed here. What you had with 4.2.1
> is what you should be getting. The obvious suspect is that
> something weird happened in the meson conversion...

Please send the (gzipped) build.ninja file.

Paolo

> 
> That said, there must be something specific to your setup which
> is causing this. I just tried (on Ubuntu 18.04):
> 
> $ git clone  https://git.qemu.org/git/qemu.git
> $ cd qemu
> $ mkdir build
> $ cd build
> $ ../configure --disable-system --enable-linux-user --static
> --target-list=aarch64-linux-user
> $ make -j8
> 
> and 'file qemu-aarch64' says:
> qemu-aarch64: ELF 64-bit LSB executable, x86-64, version 1
> (GNU/Linux), statically linked, for GNU/Linux 3.2.0,
> BuildID[sha1]=c3e1ffd0a2805a7043a40659ecbc7774cb42f7bf, with
> debug_info, not stripped
> and 'ldd qemu-aarch64' says:
>          not a dynamic executable
> 
> as expected.