https://bugs.llvm.org/show_bug.cgi?id=49364
Bug ID: 49364
Summary: llvm-objcopy should remove .symtab_shndx if enough
symbols are removed
Product: tools
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: llvm-objcopy/strip
Assignee: unassignedb...@nondot.org
Reporter: jh7370.2...@my.bristol.ac.uk
CC: alexander.v.shaposhni...@gmail.com,
jake.h.ehrl...@gmail.com,
jh7370.2...@my.bristol.ac.uk,
llvm-bugs@lists.llvm.org, ruppre...@google.com
llvm-objcopy is intended to emit the SHT_SYMTAB_SHNDX table if and only if it
is required. The table is required if at least one section with an index >=
SHN_LORESERVE has at least one symbol.
When adding/removing sections, or when adding new symbols, this process appears
to work correctly. However, if all symbols in sections with index >=
SHN_LORESERVE are removed (but not the sections themselves), llvm-objcopy still
emits the .symtab_shndx section. The problem is that the `HasSymbol` section
member, which is used to identify whether a section with index >= SHN_LORESERVE
should cause emission of the SHT_SYMTAB_SHNDX section, is not updated after a
symbol has been removed. Consequently, the check to see whether the table
should be added spuriously thinks it should.
Running llvm-objcopy without any switches on the output of an operation that
should have removed the table, but didn't, results in the table being
discarded.
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