[Bug ld/30300] LTO drops entry point symbol

[nickc at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=30300

Nick Clifton <nickc at redhat dot com> changed:

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                 CC|                            |nickc at redhat dot com

--- Comment #1 from Nick Clifton <nickc at redhat dot com> ---
Created attachment 14816
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14816&action=edit
Proposed patch

Hi Pali,

  Please try out this patch and let me know if it works for you.

  I must admit that for the longest time I was blaming the lto plugin
  rather than the linker, but it turns out that I was wrong.  The key
  fact is that if the user adds "-e <foo>" to the linker command line
  then code in ld/ldemul.c adds an unresolved reference to <foo> which
  in turn prevents the LTO compiler from optimizing away any definitions
  of <foo>.  When -e is not used, this undefined reference (to the default
  startup symbol _mainCRTStartup) was not being created and so the LTO
  compiler was dropping the code...

Cheers
  Nick

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