tree 4a9f0764dbdecc77657032b62db542c3602222bf
parent 51997f03061bda3c31727fe3feaaf79720580f42
author Matt Davis <nullptr@fb.com> 1569517400 +0000
committer Matt Davis <nullptr@fb.com> 1569517400 +0000

[lld][mach-o] Avoid segfaulting when handling an empty section list.

Summary:
The following patch avoids segfaulting if the section list is empty when writing a mach-o MH_OBJECT.  I ran into this case from a more complicated example trying to dead_strip while using '-r' in lld.

I'm not sure if having empty sections is a legal mach-o, but it does seem that other llvm-binutils tools can ingest such a boring object with out issue.  Would it be better to emit an error, emit a warning, or do nothing?  It seems that adding a warning diagnostic might be helpful to users, as I did not expect to have a section-less object when the linker was done.

Reviewers: kledzik, ruiu

Subscribers: llvm-commits, jrm

Tags: #lld, #llvm

Differential Revision: https://reviews.llvm.org/D67735

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@372995 91177308-0d34-0410-b5e6-96231b3b80d8