[Bug c/52927] New: "procps" do not work with -Os flag.

[Bug c/52927] New: "procps" do not work with -Os flag.

[jonatan.goebel at digitel dot com.br]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52927

             Bug #: 52927
           Summary: "procps" do not work with -Os flag.
    Classification: Unclassified
           Product: gcc
           Version: 4.5.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: jonatan.goebel@digitel.com.br


I imagine it's the same bug as I found here:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28621 but for another platform.

This happens for the e500x2 core, using uClibc 0.9.32.

The main difference, is that there is no segmentation fault, the software just
stuck.

[Bug c/52927] "procps" do not work with -Os flag.

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52927

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2012-04-10
     Ever Confirmed|0                           |1

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-04-10 13:13:33 UTC ---
If it was the same then it would be fixed in gcc 4.1.2 and not present in gcc
4.5.3

But noone can tell if it's the same because you haven't provided any
information at all about the problem.

[Bug c/52927] "procps" do not work with -Os flag.

[jonatan.goebel at digitel dot com.br]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52927

--- Comment #2 from Jonatan GOebel <jonatan.goebel at digitel dot com.br> 2012-04-10 15:14:53 UTC ---
The ps code calls the funcion "set_personality()"

This function ends with a
"goto *(found->jump);"

this goto jump to
"  case_unknown:"
do some stuffs and returns NULL.

And the program stuck, he probably returned to somewhere else.

[Bug c/52927] "procps" do not work with -Os flag.

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52927

--- Comment #3 from Uros Bizjak <ubizjak at gmail dot com> 2012-04-10 17:52:52 UTC ---
(In reply to comment #2)

Please follow instructions at http://gcc.gnu.org/bugs/#report on how to provide
all required information.

[Bug c/52927] "procps" do not work with -Os flag.

[jonatan.goebel at digitel dot com.br]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52927

--- Comment #5 from Jonatan GOebel <jonatan.goebel at digitel dot com.br> 2012-04-10 18:16:36 UTC ---
Created attachment 27126
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27126
S file compiled without -Os flag

[Bug c/52927] "procps" do not work with -Os flag.

[jonatan.goebel at digitel dot com.br]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52927

--- Comment #4 from Jonatan GOebel <jonatan.goebel at digitel dot com.br> 2012-04-10 18:15:58 UTC ---
Created attachment 27125
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27125
S file compiled with -Os flag

[Bug c/52927] "procps" do not work with -Os flag.

[jonatan.goebel at digitel dot com.br]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52927

--- Comment #6 from Jonatan GOebel <jonatan.goebel at digitel dot com.br> 2012-04-10 18:17:39 UTC ---
Created attachment 27127
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27127
compiled sorce file.

[Bug c/52927] "procps" do not work with -Os flag.

[jonatan.goebel at digitel dot com.br]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52927

--- Comment #7 from Jonatan GOebel <jonatan.goebel at digitel dot com.br> 2012-04-10 18:24:55 UTC ---
props project: http://procps.sourceforge.net/index.html

Hi, I attached the i and the S files from the source code that causes the
program to stuck.

And this is the only warning in this source.
In file included from ps/../proc/escape.h:7:0,
                 from ps/common.h:16,
                 from ps/global.c:24:
ps/../proc/readproc.h:76:2: warning: padding struct to align 'start_code'

the full command line is:
powerpc-e500v2-linux-uclibcspe-gcc -c -D_GNU_SOURCE -I proc -fno-common
-ffast-math -W -Wall -Wshadow -Wcast-align -Wredundant-decls
-Wbad-function-cast -Wcast-qual -Wwrite-strings -Waggregate-return
-Wstrict-prototypes -Wmissing-prototypes  -Os -save-temps 
-Wdeclaration-after-statement -Wpadded -Wstrict-aliasing -fweb
-frename-registers -fomit-frame-pointer -fno-inline-functions ps/global.c -o
ps/global.o

[Bug c/52927] "procps" do not work with -Os flag.

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52927

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |UNCONFIRMED
     Ever Confirmed|1                           |0

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-04-10 20:57:06 UTC ---
Thank you for the additional details.

[Bug c/52927] "procps" do not work with -Os flag.

[jonatan.goebel at digitel dot com.br]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52927

--- Comment #9 from Jonatan GOebel <jonatan.goebel at digitel dot com.br> 2012-04-19 15:14:27 UTC ---
Hi.

The problem actually happen when using -Os and -frename-registers.

Also the source code may note help, because it randomly happens on different
parts of the code depending on compiling flags and source code size. But always
stuck after a "return" that never returns.

[Bug target/52927] "procps" do not work with -Os flag.

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52927

Segher Boessenkool <segher at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |WONTFIX
                 CC|                            |segher at gcc dot gnu.org
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #10 from Segher Boessenkool <segher at gcc dot gnu.org> ---
The powerpcspe backend has been deprecated in GCC 8 and removed during GCC 9
development. See corresponding mailing list threads[1,2,3] for details.

[1] https://gcc.gnu.org/legacy-ml/gcc/2018-04/msg00102.html
[2] https://gcc.gnu.org/legacy-ml/gcc-patches/2018-12/msg00123.html
[3] https://gcc.gnu.org/pipermail/gcc/2020-May/232342.html