7cc328600e
After 1af25a986069f2ae8c724133fa8649bb795a7925, we stop unconditionally retaining wrapped symbols, which means that LTO's summary-based global dead stripping can eliminate them even if they'll be referenced by a linker script after the wrapping is performed. Mark symbols referenced in linker scripts as `referenced` in addition to `isUsedInRegularObj`, so that the wrapping logic correctly sets `referencedAfterWrap` for the symbols which will be referenced after wrapping, which will prevent LTO from eliminating them. An alternative would have been to change the `referencedAfterWrap` logic to look at `isUsedInRegularObj` in addition to `referenced`, but `isUsedInRegularObj` is also set in other places (e.g. for the entry symbol), and it's not clear that we want `referencedAfterWrap` to take all those places into account, so it seemed better to keep that logic as-is and instead set `referenced` for linker script-referenced symbols. Reviewed By: MaskRay Differential Revision: https://reviews.llvm.org/D124433
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.