Re: bootstrap failure; tiny test case

[Jeffrey A Law <law at cygnus dot com>]

  In message <20000206135105.K1345@rjlhome.sco.com>you write:
  > I originally thought this was a fortran thing.  I was wrong.  It just
  > turned out that libg77 contained the C code that triggers failures in
  > both dwarfout.c and dwarf2out.c that has a note saying:
  > 
  >           /* When optimization is enabled (via -O) some parts of the compil
  > er 
  >              (e.g. jump.c and cse.c) may try to delete CODE_LABEL insns whi
  > ch 
  >              represent source-level labels which were explicitly declared b
  > y
  >              the user.  This really shouldn't be happening though, so catch
  >              it if it ever does happen.  */
  > 
  > Contrary to the note, -O doesn't have to be present to trigger this.
  > I can reproduce it on GNU/Linux by building the following program with
  > either -gdwarf or -gdwarf-2.  
  > 
  > 
  > 
  > Test case:
  > 
  > void f_clos(int x)
  > 
  > {        
  >         switch(x) {
  >                 default:
  >                 mumble:
  >         }
  > }
  > 
  > This is one reason for my recent bootstrap failures on all the SCO
  > targets.  The failure was introduced sometime since Feb 2.
FYI, I installed this into the testsuite.

jeff