[Bug 228151] gptboot broken when compiled with clang 6 and WITHOUT_LOADER_GELI -- clang 5 is OK

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228151

            Bug ID: 228151
           Summary: gptboot broken when compiled with clang 6 and
                    WITHOUT_LOADER_GELI -- clang 5 is OK
           Product: Base System
           Version: 11.1-STABLE
          Hardware: i386
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: mail at fbsd.e4m.org

FreeBSD 11.2 r333382 (or older if clang 6 is used)

When compiled with clang 6 and WITHOUT_LOADER_GELI gptboot hangs where
stage 2 should be run -- when the '\' should start spinning the screen
turns white and the box hangs (tested on two machines, an Asus P5W and
a Supermicro A2SAV).

The gptboot in question is:
-r--r--r--  1 root  wheel  20859 11 May 11:46 /boot/gptboot

It worked as long as clang 5 was in the base system.

It also works

1. if WITHOUT_LOADER_GELI is removed. The resulting gptboot is:
-r--r--r--  1 root  wheel  66082 11 May 11:49 /boot/gptboot

or

2. if -O1 is changed to -O2 in stand/i386/gptboot/Makefile.
The resulting gptboot is:
-r--r--r--  1 root  wheel  22023 11 May 11:48 /boot/gptboot

See also:
https://lists.freebsd.org/pipermail/freebsd-stable/2018-April/088814.html

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