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On 2014-05-02T04:40:04+00:00 Michael Collison wrote:

Created attachment 32722
Preprocssed file to reproduce bug

Data flow analysis in variable tracking does not converge and causes an
infinite loop with the attached file and following compile options:

./cc1plus -quiet -fpreprocessed qmltextgenerator.ii -dumpbase
qmltextgenerator.ii -march=armv4t -mfloat-abi=soft -mtls-dialect=gnu
-auxbase-strip x.o -g -O2 -Wformat=1 -Werror=format-security -Wall
-Wextra -version -fstack-protector -fvisibility=hidden -fvisibility-
inlines-hidden -fPIC --param ssp-buffer-size=4 -o qmltextgenerator.s

GCC configured with --target=arm-linux-gnueabi

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https://bugs.launchpad.net/ubuntu/+source/gcc-4.9/+bug/1352417/comments/0

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On 2014-05-02T08:17:39+00:00 Ktkachov wrote:

Confirmed with arm-none-eabi as well.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/gcc-4.9/+bug/1352417/comments/1

------------------------------------------------------------------------
On 2014-05-07T01:31:55+00:00 Mkuvyrkov wrote:

Assigned to myself as Michael does not have a GCC developer account yet.
Michael is the one working on this bug.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/gcc-4.9/+bug/1352417/comments/2

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On 2014-08-04T15:42:04+00:00 Ktkachov wrote:

*** Bug 62013 has been marked as a duplicate of this bug. ***

Reply at:
https://bugs.launchpad.net/ubuntu/+source/gcc-4.9/+bug/1352417/comments/6

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On 2014-08-04T15:45:17+00:00 Ktkachov wrote:

Filling in some fields, this still fails on the 4.8 and 4.9 branches but
works on trunk.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/gcc-4.9/+bug/1352417/comments/7

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On 2014-08-04T18:07:47+00:00 Cbaylis-u wrote:

Created attachment 33244
Reduced test case


$ arm-unknown-linux-gnueabihf-gcc -S -O2 -g reduced1.cpp

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https://bugs.launchpad.net/ubuntu/+source/gcc-4.9/+bug/1352417/comments/8

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On 2014-08-04T18:43:39+00:00 Cbaylis-u wrote:


git bisect points to r211625 as the revision which fixes/hides this bug on trunk.

2014-06-13  Richard Biener  <rguenther@xxxxxxx>

        * tree-ssa-pre.c (eliminate_dom_walker::before_dom_children):
        Rewrite to propagate the VN result into all uses where
        possible and to remove stmts becoming dead because of that.
        (eliminate): Generalize stmt removal handling, remove in
        reverse dominator order to support proper debug stmt
        generation.  Update stmts before removing stmts.
        * tree-ssa-propagate.c (propagate_tree_value): Remove
        bogus assert.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/gcc-4.9/+bug/1352417/comments/9

------------------------------------------------------------------------
On 2014-08-04T18:55:00+00:00 Michael Collison wrote:

Charlie,

I still feel that the var tracking pass should be able to protect itself 
from an infinite loop.

On 8/4/2014 11:43 AM, cbaylis at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61033
>
> --- Comment #6 from cbaylis at gcc dot gnu.org ---
>
> git bisect points to r211625 as the revision which fixes/hides this bug on
> trunk.
>
> 2014-06-13  Richard Biener  <rguenther@xxxxxxx>
>
>          * tree-ssa-pre.c (eliminate_dom_walker::before_dom_children):
>          Rewrite to propagate the VN result into all uses where
>          possible and to remove stmts becoming dead because of that.
>          (eliminate): Generalize stmt removal handling, remove in
>          reverse dominator order to support proper debug stmt
>          generation.  Update stmts before removing stmts.
>          * tree-ssa-propagate.c (propagate_tree_value): Remove
>          bogus assert.
>

Reply at:
https://bugs.launchpad.net/ubuntu/+source/gcc-4.9/+bug/1352417/comments/10


** Changed in: gcc
       Status: Unknown => Confirmed

** Changed in: gcc
   Importance: Unknown => Medium

-- 
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https://bugs.launchpad.net/bugs/1352417

Title:
  [4.8/4.9 Regression] cc1plus doesn't terminate when called with -g on
  arm-linux-gnueabihf

Status in The GNU Compiler Collection:
  Confirmed
Status in “gcc-4.8” package in Ubuntu:
  New
Status in “gcc-4.9” package in Ubuntu:
  New
Status in “gcc-4.9” package in Debian:
  Confirmed

Bug description:
  seen on the 4.8 and 4.9 branch, cc1plus doesn't terminate. omitting
  the -g lets the command succeed.

  $ g++ -v -std=c++0x -c -g -O2 qmltextgenerator.cpp

  
  Program received signal SIGINT, Interrupt.
  0x0054920c in canonicalize_values_star(variable_def**, dataflow_set_def*) ()
  (gdb) bt
  #0  0x0054920c in canonicalize_values_star(variable_def**, dataflow_set_def*)
      ()
  #1  0x0054b0c2 in ?? ()
  #2  0x0054ca08 in ?? ()
  #3  0x0054d8ba in ?? ()
  #4  0x0039928a in execute_one_pass(opt_pass*) ()
  #5  0x00399448 in execute_pass_list(opt_pass*) ()
  #6  0x00399452 in execute_pass_list(opt_pass*) ()
  #7  0x00399452 in execute_pass_list(opt_pass*) ()
  #8  0x00244a8c in ?? ()
  #9  0x00245ca4 in compile() ()
  #10 0x00246030 in finalize_compilation_unit() ()
  #11 0x00158fc4 in cp_write_global_declarations() ()
  #12 0x00409394 in ?? ()
  #13 0x0040aad0 in toplev_main(int, char**) ()
  #14 0xb6d4f630 in __libc_start_main (main=0x111e19 <main>, argc=26, 
      argv=0xbefff604, init=<optimized out>, fini=0x7b2af5 <__libc_csu_fini>, 
      rtld_fini=0xb6fe24e5 <_dl_fini>, stack_end=0xbefff604) at libc-start.c:287
  #15 0x00112058 in _start ()

  defaults are -march=armv7-a -mfloat-abi=hard -mfpu=vfpv3-d16 -mthumb

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