d923309a17
Introduce a new linker command line option "-strictdups", which enables sanity checking of "ok to duplicate" symbols, especially DWARF info symbols. Acceptable values are 0 (no checking) 1 (issue warnings) and 2 (issue a fatal error checks fail). Currently if we read a DWARF symbol (such as "go.info.PKG.FUNCTION") from one object file, and then encounter the same symbol later on while reading another object file, we simply discard the second one and move on with the link, since the two should in theory be identical. If as a result of a compiler bug we wind up with symbols that are not identical, this tends to (silently) result in incorrect DWARF generation, which may or may not be discovered depending on who is consuming the DWARF and what's being done with it. When this option is turned on, at the point where a duplicate symbol is detected in the object file reader, we check to make sure that the length/contents of the symbol are the same as the previously read symbol, and print a descriptive warning (or error) if not. For the time being this can be used for one-off testing to find problems; at some point it would be nice if we can enable it by default. Updates #30908. Change-Id: I64c4e07c326b4572db674ff17c93307e2eec607c Reviewed-on: https://go-review.googlesource.com/c/go/+/168410 Run-TryBot: Than McIntosh <thanm@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org> |
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