[llvm-bugs] [Bug 49969] New: Clang computes absolute address of global structure when compiling with position independent code.

via llvm-bugs llvm-bugs at lists.llvm.org
Thu Apr 15 03:07:12 PDT 2021


https://bugs.llvm.org/show_bug.cgi?id=49969

            Bug ID: 49969
           Summary: Clang computes absolute address of global structure
                    when compiling with position independent code.
           Product: clang
           Version: 11.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C
          Assignee: unassignedclangbugs at nondot.org
          Reporter: liljaanton2001 at gmail.com
                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 24756
  --> https://bugs.llvm.org/attachment.cgi?id=24756&action=edit
Example code which shows when incorrect behavior appears.

When taking an address of a global structure clang computes an absolute address
to the struct instead having it be an offset to the IP. This only happens when
in specific circumstances, see attached example.c.

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