Re: optimization/9630: [3.2/3.3/3.4 regression] crash with -freg-struct-return in C++ code

Re: optimization/9630: [3.2/3.3/3.4 regression] crash with -freg-struct-return in C++ code

[Steven Bosscher]

The following reply was made to PR optimization/9630; it has been noted by GNATS.

From: Steven Bosscher <s.bosscher@student.tudelft.nl>
To: gcc-gnats@gcc.gnu.org, gcc-bugs@gcc.gnu.org, nobody@gcc.gnu.org,
	stefan@space.twc.de, bangerth@gcc.gnu.org
Cc:  
Subject: Re: optimization/9630: [3.2/3.3/3.4 regression] crash with -freg-struct-return
 in C++ code
Date: Wed, 12 Mar 2003 12:08:48 +0100

 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9630
 
 Stefan, Wolfgang,
 
 I cannot reproduce this bug with yesterdays 3.3 sources for 
 i586-pc-linux-gnu.
 Do you still see it?  Maybe this one is present on 3.2 but not 3.3?  If 
 so, this
 shouldn't be marked as a 3.3/3.4 regression.
 
 Greetz
 Steven
 
 
 # gcc-3.3 -v -lstdc++ test.cc -freg-struct-return -O2
 Reading specs from /opt/experimental/lib/gcc-lib/i586-pc-linux-gnu/3.3/specs
 Configured with: ../gcc-3.3/configure --disable-nls --with-gnu-as 
 --with-gnu-ld --prefix=/opt/experimental --program-suffix=-3.3 
 --enable-languages=c,c++
 Thread model: posix
 gcc version 3.3 20030311 (prerelease)
  /opt/experimental/lib/gcc-lib/i586-pc-linux-gnu/3.3/cc1plus -quiet -v 
 -D__GNUC__=3 -D__GNUC_MINOR__=3 -D__GNUC_PATCHLEVEL__=0 -D_GNU_SOURCE 
 test.cc -D__GNUG__=3 -quiet -dumpbase test.cc -auxbase test -O2 -version 
 -freg-struct-return -o /tmp/cc1NHg6T.s
 GNU C++ version 3.3 20030311 (prerelease) (i586-pc-linux-gnu)
     compiled by GNU C version 3.3 20030311 (prerelease).
 GGC heuristics: --param ggc-min-expand=42 --param ggc-min-heapsize=23891
 ignoring nonexistent directory "/opt/experimental/i586-pc-linux-gnu/include"
 #include "..." search starts here:
 #include <...> search starts here:
  /opt/experimental/include/c++/3.3
  /opt/experimental/include/c++/3.3/i586-pc-linux-gnu
  /opt/experimental/include/c++/3.3/backward
  /usr/local/include
  /opt/experimental/include
  /opt/experimental/lib/gcc-lib/i586-pc-linux-gnu/3.3/include
  /usr/include
 End of search list.
  as -V -Qy -o /tmp/cccnvLCd.o /tmp/cc1NHg6T.s
 GNU assembler version 2.11.90.0.24 (i486-suse-linux) using BFD version 
 2.11.90.0.24
  /opt/experimental/lib/gcc-lib/i586-pc-linux-gnu/3.3/collect2 -m 
 elf_i386 -dynamic-linker /lib/ld-linux.so.2 /usr/lib/crt1.o 
 /usr/lib/crti.o 
 /opt/experimental/lib/gcc-lib/i586-pc-linux-gnu/3.3/crtbegin.o 
 -L/opt/experimental/lib/gcc-lib/i586-pc-linux-gnu/3.3 
 -L/opt/experimental/lib/gcc-lib/i586-pc-linux-gnu/3.3/../../.. -lstdc++ 
 /tmp/cccnvLCd.o -lgcc -lgcc_eh -lc -lgcc -lgcc_eh 
 /opt/experimental/lib/gcc-lib/i586-pc-linux-gnu/3.3/crtend.o /usr/lib/crtn.o
 
 # LD_LIBRARY_PATH=/opt/experimental/lib/ a.out
 2
 

Re: optimization/9630: [3.2/3.3/3.4 regression] crash with -freg-struct-return in C++ code

[steven]

Synopsis: [3.2/3.3/3.4 regression] crash with -freg-struct-return in C++ code

State-Changed-From-To: analyzed->closed
State-Changed-By: steven
State-Changed-When: Wed Mar 12 18:44:56 2003
State-Changed-Why:
    not a bug.
    
    -freg-struct-return will change the ABI, so if you link with a library that was not compiled with this option, you can expect this kind of bug.  This is documented in the manual.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9630

Re: optimization/9630: [3.2/3.3/3.4 regression] crash with -freg-struct-return in C++ code

[Steven Bosscher]

The following reply was made to PR optimization/9630; it has been noted by GNATS.

From: Steven Bosscher <s.bosscher@student.tudelft.nl>
To: gcc-gnats@gcc.gnu.org, gcc-bugs@gcc.gnu.org, nobody@gcc.gnu.org,
	stefan@space.twc.de, bangerth@gcc.gnu.org
Cc:  
Subject: Re: optimization/9630: [3.2/3.3/3.4 regression] crash with -freg-struct-return
 in C++ code
Date: Wed, 12 Mar 2003 12:12:26 +0100

 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9630
 
 Oh wait...  With -O and -O2 it works, but it crashes *without* 
 optimization... Right, hmm, OK...  Ignore previous mail.
 
 Greetz
 Steven
 
 #  gcc-3.3 -lstdc++ test.cc -freg-struct-return -O
 # LD_LIBRARY_PATH=/opt/experimental/lib/ a.out
 2
 # gcc-3.3 -lstdc++ test.cc -freg-struct-return  
 # LD_LIBRARY_PATH=/opt/experimental/lib/ a.out
 Segmentatie fout
 #
 

Re: optimization/9630: [3.2/3.3/3.4 regression] crash with -freg-struct-return in C++ code

[bangerth]

Old Synopsis: crash with -freg-struct-return in C++ code
New Synopsis: [3.2/3.3/3.4 regression] crash with -freg-struct-return in C++ code

State-Changed-From-To: open->analyzed
State-Changed-By: bangerth
State-Changed-When: Fri Feb 14 20:53:46 2003
State-Changed-Why:
    Confirmed. Worked with 2.95, so is a regression.
    
    Stefan, if you want to help us greatly, try to reduce the
    code further, by first using -save-temps to get rid
    of what the preprocessor does, then delete all the lines
    starting with a '#', and then chip away whatever is not
    needed to demonstrate the bug. We need to find out which
    function exactly is being miscompiled, and the present
    testcase is too large for this, so it would take us some
    time. If you could try to get it smaller, that would be
    greatly appreciated!
    
    Thanks
      Wolfgang

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9630