Internal compiler error on ARM with gcc 4.6.3

[Thomas Petazzoni <thomas dot petazzoni at free-electrons dot com>]

Hello,

The ARM cross-compiler generated by Crosstool-NG, with gcc 4.6.3,
uClibc 0.9.33.2, binutils 2.20.1a, is not capable of building
the libust library from the LTTng project. It fails with the following
internal error:

  CC     libustsnprintf_la-fflush.lo
  CC     libustsnprintf_la-fvwrite.lo
  CC     libustsnprintf_la-mbrtowc_sb.lo
  CC     libustsnprintf_la-snprintf.lo
  CC     libustsnprintf_la-vfprintf.lo
  CC     libustsnprintf_la-core.lo
  CC     libustsnprintf_la-patient_write.lo
  CC     libustsnprintf_la-wsetup.lo
vfprintf.c: In function 'ust_safe_vfprintf':
vfprintf.c:956:1: error: unrecognizable insn:
(insn 3361 3360 3362 172 (set (subreg:SI (reg/v:DI 162 [ _umax ]) 0)
        (sign_extend:SI (mem:QI (plus:SI (mult:SI (reg/v:SI 168 [ nextarg ])
                        (const_int 8 [0x8]))
                    (reg/f:SI 1177 [ argtable.7 ])) [0 *D.3971_569+0 S1 A32]))) vfprintf.c:555 -1
     (nil))
vfprintf.c:956:1: internal compiler error: in extract_insn, at recog.c:2109
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

To reproduce the problem:

  wget http://git.buildroot.net/buildroot-test/plain/utils/br-reproduce-build
  chmod +x br-reproduce-build
  ./br-reproduce-build 1ce63578120c07b3f96d1b4ae558acae10f00fd2

For more details, see:

  http://autobuild.buildroot.org/results/1ce63578120c07b3f96d1b4ae558acae10f00fd2/

Thanks,

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com

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