[Bug ld/23872] New: MinGW Binaries can be built with misaligned relocation information

[marc at groundctl dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23872

            Bug ID: 23872
           Summary: MinGW Binaries can be built with misaligned relocation
                    information
           Product: binutils
           Version: 2.30
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: marc at groundctl dot com
  Target Milestone: ---

Clang does not align certain sections in its object files, so when they are
linked it is possible that the runtime relocation sections are not aligned.
This causes the linker to re-align them, but the value of "rt_psrelocs_start"
is set before the realignment, so when the dll is loaded it looks in the wrong
place for the relocations and fails.

This can be fixed by forcing realignment by adding the line ". = ALIGN(4);" to
the linker script immediately before setting rt_psrelocs_start.

This bug was also reported to MinGW64:
https://sourceforge.net/p/mingw-w64/bugs/769/

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