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Force the linker to keep the `polkadot_jemalloc_shim` crate and its `#[global_allocator]` in all binaries that depend on it. Without it, the linker might drop it since it is seen as a dependency with no referenced symbols. The issue happens only on a subset of combination of rust version and linker (e.g. on CI with Ubunti 24.04, rust 1.88.0 + gcc/ld strips the jemalloc crate from the binary but not rust 1.92.0 and also rust 1.88.0 + clang/mold works fine. One way to reproduce the issue on my local Ubuntu machine using `frame-omni-bencher` as reference (current latest version v0.17.2 has the shim with jemalloc-allocator feature as dependency, as coming from PR #11069 ): 1. building with rust 1.92.0 / gcc +ld => the linker doesn't strip jemalloc allocator from the binary: ```bash nm frame-omni-bencher | grep -i jemalloc 000000000149bf60 t _GLOBAL__sub_I_jemalloc_nodump_allocator.cc 0000000000eacae0 t jemalloc_constructor 0000000000eacd50 t _rjem_je_jemalloc_postfork_child 0000000000eacc70 t _rjem_je_jemalloc_postfork_parent 0000000000eacaf0 t _rjem_je_jemalloc_prefork 000000000262bb08 b _ZN7rocksdbL18jemalloc_type_infoB5cxx11E ``` 2. building with rust 1.88.0 / gcc + ld => the linker strips aways it ```bash 000000000027f8c0 t _GLOBAL__sub_I_jemalloc_nodump_allocator.cc 00000000023a3598 b _ZN7rocksdbL18jemalloc_type_infoB5cxx11E ``` 3. building with rust 1.88.0 / clang + mold => the linker keeps it (same as 1.) Since currently CI relies on Ubuntu 24.04 gcc /ld + rust 1.88.0, we go here for the conservative approach to force the linker not to drop with the `extern crate` change in all impacted binaries. Next step - outside this PR - is to bump rust version. --------- Co-authored-by: cmd[bot] <41898282+github-actions[bot]@users.noreply.github.com> Co-authored-by: Bastian Köcher <git@kchr.de> (cherry picked from commit d774715)
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Unrelated to this PR but needed to make CI happy - I had to backport @EgorPopelyaev 's fix in master ad72e48 to cleanup umbrella |
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Backport paritytech#11114 into `stable2512` from sigurpol. See the [documentation](https://github.com/paritytech/polkadot-sdk/blob/master/docs/BACKPORT.md) on how to use this bot. <!-- # To be used by other automation, do not modify: original-pr-number: #${pull_number} --> Co-authored-by: Paolo La Camera <paolo@parity.io> Co-authored-by: cmd[bot] <41898282+github-actions[bot]@users.noreply.github.com> Co-authored-by: Bastian Köcher <git@kchr.de>
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Backport #11114 into
stable2512from sigurpol.See the documentation on how to use this bot.