LLVM 18 will be released. As usual, I maintain lld/ELF and have addedsome notes to https://github.com/llvm/llvm-project/blob/release/18.x/lld/docs/ReleaseNotes.rst.Here I will elaborate on some changes.

• --fat-lto-objects option is added to support LLVMFatLTO. Without --fat-lto-objects, LLD will link LLVMFatLTO objects using the relocatable object file.(D146778 <https://reviews.llvm.org/D146778>_)
• -Bsymbolic-non-weak is added to directly bind non-weakdefinitions.(D158322 <https://reviews.llvm.org/D158322>_)
• --lto-validate-all-vtables-have-type-infos, whichcomplements --lto-whole-program-visibility, is added todisable unsafe whole-program devirtualization.--lto-known-safe-vtables=<glob> can be used to markknown-safe vtable symbols.(D155659 <https://reviews.llvm.org/D155659>_)
• --save-temps --lto-emit-asm now derives ELF/asm filenames from bitcode file names.ld.lld --save-temps a.o d/b.o -o out will create ELFrelocatable files out.lto.a.o/d/out.lto.b.oinstead of out1.lto.o/out2.lto.o. (#78835)
• --no-allow-shlib-undefined now reports errors for DSOreferencing non-exported definitions. (#70769)
• common-page-size can now be larger than the system page-size.(#57618 <https://github.com/llvm/llvm-project/issues/57618>_)
• When call graph profile information is available due toinstrumentation or sample PGO, input sections are now sorted using thenew cdsort algorithm, better than the previoushfsort algorithm.(D152840 <https://reviews.llvm.org/D152840>_)
• Symbol assignments like a = DEFINED(a) ? a : 0; are nowhandled. (#65866)
• OVERLAY now supports optional start address and LMA (#77272)
• Relocations referencing a symbol defined in /DISCARD/section now lead to an error. (#69295)
• For AArch64 MTE, global variable descriptors have been implemented.(D152921 <https://reviews.llvm.org/D152921>_)
• R_AARCH64_GOTPCREL32 is now supported. (#72584)
• R_LARCH_PCREL20_S2/R_LARCH_ADD6/R_LARCH_CALL36and extreme code model relocations are now supported.
• --emit-relocs is now supported for RISC-V linkerrelaxation.(D159082 <https://reviews.llvm.org/D159082>_)
• Call relaxation respects RVC when mixing +c and -c relocatablefiles. (#73977)
• R_RISCV_GOT32_PCREL is now supported. (#72587)
• R_RISCV_SET_ULEB128/R_RISCV_SUB_ULEB128relocations are now supported. (#72610) (#77261)
• RISC-V TLSDESC is now supported. (#79239)
• SystemZ (s390x) is now supported. (#75643)

Although a substantial feature, the s390x port benefited from UlrichWeigand's meticulously prepared patch, complete with comprehensive testsfrom the outset. While I typically provide extensive feedback for suchlarge additions, the patch's exceptional quality minimized the number ofcomment rounds needed in this instance. I truly appreciate Ulrich takingthe time to reply to my remarks onthe s390x ABI. His guidance was instrumental.

The RISC-V port has received a few new relocations for.uleb128 label differences and TLSDESC. I'm glad I madethese assembler and linker changes in time, allowing LoongArchdevelopers to port the code for LoongArch. LoongArch borrows manydesigns from RISC-V. If they were to implement these features first, I'dprobably have to spend more time on code reviews, and the outcome wouldbe less rewarding since I wouldn't be the original patch author.

To the best of my knowledge, there is no performance-specificchange.