Found 756777 1.0.2-6
Thanks
I've just tested and found that building with gcc/g++ 4.8 fixes the build.
Using 4.8 also requires switching from strong to regular stack protector. This
can be done with the following
export
CC=gcc-4.8
export
CXX=g++-4.8
export
DEB_CFLAGS_MAINT_STRIP=-fstack-protector-strong
export
DEB_CFLAGS_MAINT_APPEND=-fstack-protector
export
DEB_CXXFLAGS_MAINT_STRIP=-fstack-protector-strong
export DEB_CXXFLAGS_MAINT_APPEND=-fstack-protector
If noone proposes a better soloution in the next couple of days I'll
wrap this
in appropriate conditional logic and upload it as a NMU.
Sebastian Ramacher wrote:
On 2014-10-13 03:29:19, peter green wrote:
Found 756777 1.0.2-6
Thanks
| Checking encode and decode of colourbars
|
| 2: colourbars FAILED (colourbars.at:7)
|
I've just reproduced this locally with both sid's version in sid and
jessie's version in jessie. So this doesn't appear to be related to the
change in the sid package but related to some change in the build
environment. If I had to guess i'd say a computer
I think it's a toolchain bug. I did debug the issue some time after
filing the bug report, but forgot to report my findings to the bug. The
same version built fine in a wheezy chroot on harris, but fails in a
unstable chroot.
Here is the backtrace I got at the time:
#0 dirac::PictureCompressor::SelectQuantisers (this=this@entry=0x207ccc4, coeff_data=..., bands=..., lambda=lambda@entry=6.25, est_bits=...,
cb_mode=QUANT_SINGLE, pp=..., csort=csort@entry=dirac::Y_COMP) at picture_compress.cpp:632
#1 0x00036d94 in dirac::PictureCompressor::CodeResidue (this=this@entry=0x207ccc4, my_buffer=..., pnum=<optimized out>,
p_picture_byteio=p_picture_byteio@entry=0x20e4ae8) at picture_compress.cpp:449
#2 0x000232ee in dirac::SequenceCompressor::CompressNextPicture
(this=0x207cba8) at seq_compress.cpp:447
#3 0x00018e72 in DiracEncoder::CompressNextPicture (this=this@entry=0x207c400)
at dirac_encoder.cpp:607
#4 0x0001b122 in CompressNextPicture (this=0x207c400) at dirac_encoder.cpp:1141
#5 dirac_encoder_output (encoder=0x207c240) at dirac_encoder.cpp:1106
#6 0x00014b20 in main (argc=<optimized out>, argv=<optimized out>) at
encmain.cpp:1234
The offending line is "est_bits[b] = SelectMultiQuants( coeff_data ,
bands , b, lambda, ...". Printing b (or another index somewhere up the
call trace - I don't remember exactly) immediately before this line,
makes the crash go away. This makes me think gcc fails at optimizing the
code and generates broken output.
I didn't debug it any further.
Cheers
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