Re: [OE-core] [PATCH] rust-llvm: Compile llvm to use dynamic libraries

[Randy MacLeod <randy.macleod@windriver.com>]

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On 2025-03-31 12:13 p.m., Khem Raj via lists.openembedded.org wrote:
>
>
> On Mon, Mar 31, 2025 at 6:30 AM Richard Purdie via 
> lists.openembedded.org <http://lists.openembedded.org> 
> <richard.purdie=linuxfoundation.org@lists.openembedded.org> wrote:
>
>     Our main llvm recipe uses dynamic linking already but rust-llvm
>     does not.
>     Enabling this significanly reduces the size of llvm-rust to about
>     a third
>     of what it was, which is a bettter configuration for us leading to
>     smaller
>     TMPDIR and sstate objects
>
>
> It will slow down the compiler execution and sometimes its could be 
> significant as well we have seen this with clang so it would be good 
> to have some idea around that least we provide a slow compiler 
> compared to other distro infrastructures


We'll get some performance info from the YP AB perf builds.

Sundeep,

Once we see if there's a noticeable difference in those YP AB runs,
we should  look into bench-marking  the build time for rust and
check for any difference in building Rust  in the SDK and maybe even on 
target as another benchmark.

This is less urgent than getting the failing and skipped rust tests 
enabled but it shouldn't wait too long.

../Randy



>
>
>     Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
>     ---
>      meta/recipes-devtools/rust/rust-llvm_1.85.1.bb
>     <http://rust-llvm_1.85.1.bb> | 2 ++
>      1 file changed, 2 insertions(+)
>
>     diff --git a/meta/recipes-devtools/rust/rust-llvm_1.85.1.bb
>     <http://rust-llvm_1.85.1.bb>
>     b/meta/recipes-devtools/rust/rust-llvm_1.85.1.bb
>     <http://rust-llvm_1.85.1.bb>
>     index 6a4d2957288..566348c617d 100644
>     --- a/meta/recipes-devtools/rust/rust-llvm_1.85.1.bb
>     <http://rust-llvm_1.85.1.bb>
>     +++ b/meta/recipes-devtools/rust/rust-llvm_1.85.1.bb
>     <http://rust-llvm_1.85.1.bb>
>     @@ -44,6 +44,8 @@ EXTRA_OECMAKE = " \
>          -DLLVM_ENABLE_FFI=OFF \
>          -DLLVM_INSTALL_UTILS=ON \
>          -DLLVM_BUILD_EXAMPLES=OFF \
>     +    -DLLVM_BUILD_LLVM_DYLIB=ON \
>     +    -DLLVM_LINK_LLVM_DYLIB=ON \
>          -DLLVM_INCLUDE_EXAMPLES=OFF \
>          -DLLVM_BUILD_TESTS=OFF \
>          -DLLVM_INCLUDE_TESTS=OFF \
>
>
>
>
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-- 
# Randy MacLeod
# Wind River Linux

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