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14:24:47 -0000 X-Groupsio-URL: https://lists.openembedded.org/g/openembedded-core/message/231258 --------------Fk0v10H8qQJjP3zmOoNEckDu Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by mx0a-0064b401.pphosted.com id 61HBowAD3358400 On 2026-02-13 2:51 p.m., Dora, Sunil Kumar via lists.openembedded.org wro= te: > On Thu, Feb 12, 2026 at 10:36 PM, Ross Burton wrote: > > What=E2=80=99s the impact on the native sysroot and target packages= when > we link rust against all of libLLVM.so dynamically vs statically > linking the pieces that are used? > > Hi Ross, > > Below are the observed impacts when linking Rust against shared=20 > libLLVM.so versus > statically linking LLVM components. > > On Native: > ********** > All required LLVM-related libraries were already present in=20 > recipe-sysroot-native before switching > Rust to dynamic LLVM. Dynamic linking does not introduce any new=20 > native dependencies. > Existing llvm-native artifacts are reused. > > Static: > -rw-r--r-- 1 xxx users 213M Feb 13 00:29=20 > librustc_driver-4b6f2c2478f9ef2c.so > Dynamic: > -rw-r--r-- 1 xxx users 132M Feb 13 00:52=20 > librustc_driver-4b6f2c2478f9ef2c.so > > So on native we see ~81 MB reduction in librustc_driver, with no=20 > additional sysroot growth. > > On Target: > ********** > librustc_driver shrinks from 144.8 MB to 84.2 MB (~60 MB reduction). > However, dynamic linking introduces shared libLLVM.so plus a few=20 > runtime dependencies. > > Static: > root@qemux86-64:~# ls -lh /usr/lib/librustc_driver-*.so > -rw-r--r-- =C2=A0 =C2=A01 root =C2=A0 =C2=A0 root =C2=A0 =C2=A0 =C2=A01= 44.8M Apr =C2=A05 =C2=A02011=20 > /usr/lib/librustc_driver-151eed90355bbdac.so > > Dynamic: > root@qemux86-64:~# ls -lh /usr/lib/librustc_driver-*.so > -rw-r--r-- =C2=A0 =C2=A01 root =C2=A0 =C2=A0 root =C2=A0 =C2=A0 =C2=A0 = 84.2M Apr =C2=A05 =C2=A02011=20 > /usr/lib/librustc_driver-151eed90355bbdac.so > > New dynamic dependencies: > root@qemux86-64:~# ldd /usr/lib/librustc_driver-*.so > =C2=A0 =C2=A0 =C2=A0 =C2=A0 libLLVM.so.21.1 libffi.so.8 libxml2.so.16 > > Size contribution on target: > =C2=A0- libLLVM.so.21.1 =E2=89=88 75.5 MB > =C2=A0- libxml2.so.16 =E2=89=88 1.2 MB > =C2=A0- libffi.so.8 =E2=89=88 42.5 KB > > When LLVM is only used by Rust, this results in a net image increase=20 > of approximately 15=E2=80=9316 MB. Good, that's annoying but acceptable increase: ~7% to work-around this bu= g. I'm still a bit uncomfortable with changing the way that target Rust is=20 built to deal with a Rust-native problem. Also there's the question about dynamic linking=20 increasing runtime by a small amount. Finally, I worry that few people/distros change the=20 default linking to by dynamic. So I won't object to this work-around especially if we can easily limit=20 it to -native. Have you tried that? In a few years, we won't have this mix of toolchain versions and can=20 drop this change so if this gets merged please open a tracking bug so that we don't forget. ../Randy > > -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- > Links: You receive all messages sent to this group. > View/Reply Online (#231138):https://lists.openembedded.org/g/openembedd= ed-core/message/231138 > Mute This Topic:https://lists.openembedded.org/mt/117777483/3616765 > Group Owner:openembedded-core+owner@lists.openembedded.org > Unsubscribe:https://lists.openembedded.org/g/openembedded-core/unsub [r= andy.macleod@windriver.com] > -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- > --=20 # Randy MacLeod # Wind River Linux --------------Fk0v10H8qQJjP3zmOoNEckDu Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by mx0a-0064b401.pphosted.com id 61HBowAD3358400
On 2026-02-13 2:51 p.m., Dora, Sunil Kumar via lists.openembedded.org wrote:
=20
On Thu, Feb 12, 2026 at 10:36 PM, Ross Burton wrote:
What=E2=80=99s the impact on the native sysroot and t= arget packages when we link rust against all of libLLVM.so dynamically vs statically linking the pieces that are used? Hi Ross,

Below are the observed impacts when linking Rust against shared libLLVM.so versus 
statically linking LLVM components.

On Native:
**********
All required LLVM-related libraries were already present in recipe-sysroot-native before switching 
Rust to dynamic LLVM. Dynamic linking does not introduce any new native dependencies. 
Existing llvm-native artifacts are reused.

Static:
-rw-r--r-- 1 xxx users 213M Feb 13 00:29 librustc_driver-4b6f2c2478f9ef2c.so
Dynamic:
-rw-r--r-- 1 xxx users 132M Feb 13 00:52 librustc_driver-4b6f2c2478f9ef2c.so

So on native we see ~81 MB reduction in librustc_driver, with no additional sysroot growth.

On Target:
**********
librustc_driver shrinks from 144.8 MB to 84.2 MB (~60 MB reduction).
However, dynamic linking introduces shared libLLVM.so plus a few runtime dependencies.

Static:
root@qemux86-64:~# ls -lh /usr/lib/librustc_driver-*.so
-rw-r--r--    1 root     root    =  144.8M Apr  5  2011 /usr/lib/librustc_driver-151eed90355bbdac.so

Dynamic:
root@qemux86-64:~# ls -lh /usr/lib/librustc_driver-*.so
-rw-r--r--    1 root     root    =   84.2M Apr  5  2011 /usr/lib/librustc_driver-151eed90355bbdac.so

New dynamic dependencies:
root@qemux86-64:~# ldd /usr/lib/librustc_driver-*.so
        libLLVM.so.21.1 libffi.so.8 libxml2= .so.16

Size contribution on target:
 - libLLVM.so.21.1 =E2=89=88 75.5 MB
 - libxml2.so.16 =E2=89=88 1.2 MB
 - libffi.so.8 =E2=89=88 42.5 KB

When LLVM is only used by Rust, this results in a net image increase of approximately 15=E2=80=9316 MB.


Good, that's annoying but acceptable increase: ~7% to work-around this bug.

I'm still a bit uncomfortable with changing the way that target Rust is built to deal with
a Rust-native problem. Also there's the question about dynamic linking increasing runtime
by a small amount. Finally, I worry that few people/distros change the default linking to by dynamic.

So I won't object to this work-around especially if we can easily limit it to -native. Have you tried that?
In a few years, we won't have this mix of toolchain versions and can drop this change

so if this gets merged please open a tracking bug so that we don't forget.

../Randy




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# Randy MacLeod
# Wind River Linux
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