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074af0f30f
This prints a stack of reasons that symbols that match the given glob(s)
survived GC. It has no effect unless section GC occurs.
This implementation does not require -ffunction-sections or
-fdata-sections to produce readable results, althought it does tend to
work better (as does GC).
Details about the semantics:
- Some chain of liveness reasons is reported; it isn't specified which
chain.
- A symbol or section may be live:
- Intrisically (e.g., entry point)
- Because needed by a live symbol or section
- (Symbols only) Because part of a section live for another reason
- (Sections only) Because they contain a live symbol
- Both global and local symbols (`STB_LOCAL`) are supported.
- References to symbol + offset are considered to point to:
- If the referenced symbol is a section (`STT_SECTION`):
- If a sized symbol encloses the referenced offset, the enclosing
symbol.
- Otherwise, the section itself, generically.
- Otherwise, the referenced symbol.
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.