Compiling the file from the attachment with -Os or greater -O1 results into the
compiler producing this:
# avr-rtems4.7-gcc -mmcu=avr5 -Os -g -Wall -c -o termios.o termios.c
termios.c: In function `termios_open':
termios.c:97: error: unable to find a register to spill in class `POINTER_REGS'
termios.c:97: error: this is the insn:
(insn 66 63 120 3 termios.c:91 (parallel [
(set (mem:BLK (reg/v/f:HI 28 r28 [orig:44 tty ] [44]) [0 A8])
(mem:BLK (reg/v/f:HI 45 [ callbacks ]) [0 A8]))
(use (reg:QI 24 r24 [55]))
(use (const_int 1 [0x1]))
(clobber (scratch:HI))
(clobber (scratch:HI))
(clobber (scratch:QI))
]) 16 {*movstrqi_insn} (insn_list 62 (insn_list 63 (nil)))
(expr_list:REG_DEAD (reg:QI 24 r24 [55])
(expr_list:REG_DEAD (reg/v/f:HI 45 [ callbacks ])
(expr_list:REG_UNUSED (scratch:QI)
(expr_list:REG_UNUSED (scratch:HI)
(expr_list:REG_UNUSED (scratch:HI)
(nil)))))))
termios.c:97: confused by earlier errors, bailing out
avr-rtems* basically is identical to the bare avr, so I'd expect this bug to be
reproducable with all avr-* GCC's
# avr-rtems4.7-gcc --version
avr-rtems4.7-gcc (GCC) 3.4.3 20041027 (prerelease)
--
Summary: unable to find a register to spill in class
`POINTER_REGS'
Product: gcc
Version: 3.4.3
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: ralf_corsepius at rtems dot org
CC: gcc-bugs at gcc dot gnu dot org
GCC target triplet: avr*
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18251
