[llvm-bugs] [Bug 39790] New: -fno-plt seems to trash stack frame

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Mon Nov 26 07:17:15 PST 2018


            Bug ID: 39790
           Summary: -fno-plt seems to trash stack frame
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: npl at chello.at
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

Created attachment 21159
  --> https://bugs.llvm.org/attachment.cgi?id=21159&action=edit
code reproducing the issue, and assembly both with and without -fno-plt

See the attached example program and generated assembly.

Using -fno-plt seems to mess up the stack frame, I cant really pinpoint the
issue and when its triggered, values just point to wrong places.

My system is debian buster x86_64, with clang++ being:
clang version 7.0.0-6 (tags/RELEASE_700/final)

(This is potentially a duplicate of 39252)

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