Re: [Chicken-janitors] #1278: Assertion failure on Debian/macppc with clang

[Chicken Trac]

#1278: Assertion failure on Debian/macppc with clang
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  Reporter:  sjamaan   |      Owner:
      Type:  defect    |     Status:  new
  Priority:  critical  |  Milestone:  4.11.0
 Component:  unknown   |    Version:  4.10.x
Resolution:            |   Keywords:
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Comment (by sjamaan):

 Stepping through the code with gdb (after upgrading to a recent version of
 clang) seems to indicate that everything goes well, up until the very
 moment {{{CHICKEN_run}}} calls {{{return C_restore;}}} when it wants to
 return to the host.

 I've checked, but if I put a breakpoint on the return line itself, the
 backtrace/stack frames look fine, but then if I step instruction-wise, the
 moment it tries to retrieve the return address from the stack, it takes it
 from the wrong place. Then it returns to the address which is in the
 temporary stack, instead of the address which it should return to.  This
 is only 3 instructions or so from the actual jump instruction which gets
 us out of the function.

 So I'm not sure yet (a bit more investigation is required), but it looks
 like Clang is mixing up its registers here.

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Ticket URL: <http://bugs.call-cc.org/ticket/1278#comment:1>
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