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.
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