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d96a93ff00
The GNU documentation is ambiguous about the version index for unversioned undefined symbols. The current specification at https://sourceware.org/gnu-gabi/program-loading-and-dynamic-linking.txt defines VER_NDX_LOCAL (0) as "The symbol is private, and is not available outside this object." However, this naming is misleading for undefined symbols. As suggested in discussions, VER_NDX_LOCAL should conceptually be VER_NDX_NONE and apply to unversioned undefined symbols as well. GNU ld has used index 0 for unversioned undefined symbols both before version 2.35 (see https://sourceware.org/PR26002) and in the upcoming 2.46 release (see https://sourceware.org/PR33577). This change aligns with GNU ld's behavior by switching from index 1 to index 0. While here, add a test to dso-undef-extract-lazy.s that undefined symbols of index 0 in DSO are treated as unversioned symbols.
LLVM Linker (lld)
This directory and its subdirectories contain source code for the LLVM Linker, a modular cross platform linker which is built as part of the LLVM compiler infrastructure project.
lld is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt.
Benchmarking
In order to make sure various developers can evaluate patches over the same tests, we create a collection of self contained programs.
It is hosted at https://s3-us-west-2.amazonaws.com/linker-tests/lld-speed-test.tar.xz
The current sha256 is 10eec685463d5a8bbf08d77f4ca96282161d396c65bd97dc99dbde644a31610f.