Internal compiler error on ARM with gcc 4.6.3

[Florian Fainelli]

Le 01/08/13 18:14, Thomas Petazzoni a écrit :
> 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.

I can definitively reproduce this build issue with gcc-4.6.3, 
gcc-linaro-4.6-2012.12 does not have this issue however, so it might be 
wort diffing between the two releases and see which hunk does actually 
fix the bug.

>
> 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
>

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