Fixed or forbidden register was spilled

[Jeffrey A Law]

  In message <Pine.A32.3.95.981125160322.17794A-100000@ltoi.iap.physik.tu-darms
tadt.de>you write:
  > Egcs-2.92.23 does not compile the following file t.c extracted from
  > gdb-981121/texinfo/info/echo-area.c on i586-pc-linux-gnulibc1. The
  > compilation stops with t.c:12: Invalid `asm' statement: t.c:12: fixed
  > or forbidden register 2 (cx) was spilled for class CREG.  
  > Appended is the source code and the preprocessed file t.i.
The asm in the definition of  FD_ZERO is bogus.   It has an explit clobber
which overlaps an input or output register.

jeff