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Merge commit 8df4e6094 from llvm git (by Fangrui Song):

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[ELF] Don't consider SHF_ALLOC ".debug*" sections debug sections

  Fixes PR48071

  * The Rust compiler produces SHF_ALLOC `.debug_gdb_scripts` (which
    normally does not have the flag)
  * `.debug_gdb_scripts` sections are removed from `inputSections` due
    to --strip-debug/--strip-all
  * When processing --gc-sections, pieces of a SHF_MERGE section can be
    marked live separately

  `=>` segfault when marking liveness of a `.debug_gdb_scripts` which
  is not split into pieces (because it is not in `inputSections`)

  This patch circumvents the problem by not treating SHF_ALLOC
  ".debug*" as debug sections (to prevent --strip-debug's stripping)
  (which is still useful on its own).

  Reviewed By: grimar

  Differential Revision: https://reviews.llvm.org/D91291

This should fix lld segfaulting when linking the rust-based parts of the
devel/py-maturin port.

Reported by:	Nick Venenga <nijave@gmail.com>
PR:		250783
MFC after:	3 days
This commit is contained in:
Dimitry Andric 2020-11-12 19:25:31 +00:00
parent 6abe97c014
commit 2418469b60
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=367623
1 changed files with 2 additions and 1 deletions
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3
contrib/llvm-project/lld/ELF/InputSection.h
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@ -391,7 +391,8 @@ class InputSection : public InputSectionBase {
};
inline bool isDebugSection(const InputSectionBase &sec) {
return sec.name.startswith(".debug") || sec.name.startswith(".zdebug");
return (sec.flags & llvm::ELF::SHF_ALLOC) == 0 &&
(sec.name.startswith(".debug") || sec.name.startswith(".zdebug"));
}
// The list of all input sections.