[Bug ld/21931] New: glibc 2.26 Exception handling problem on powerpc

[address@hidden]

https://sourceware.org/bugzilla/show_bug.cgi?id=21931

            Bug ID: 21931
           Summary: glibc 2.26 Exception handling problem on powerpc
           Product: binutils
           Version: 2.26
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: address@hidden
  Target Milestone: ---

Hello,

I'm building a cross-compiler for powerpc and C++ exception result in SIGABRT.
However, if the program is compiled with "-static" everything works fine.

the program used to reproduce the problem is the following :
-------
#include <unistd.h>
#include <cstdlib>
#include <cstdio>
#include <stdexcept>

class toto {
public:
  toto () throw () : a (0) {};
  ~toto () throw () {};
  void do_toto (void) throw (std::runtime_error) {
    a = 10000;
    throw (std::runtime_error ("exception toto"));
  }
private:
  int a;
};

int
main (int argc, char **argv)
{
  toto mon;

  try {
    mon.do_toto ();
  }
  catch (std::runtime_error &except) {
    printf ("except: %s\n", except.what ()); 
  }

  exit (0);
}
-------

It is compiled using the following command:
> ppc-linux-g++ -Wall -g -O2 titi.cc -o titi_1.4.0_no_static
( or /opt/cldk-1.4.0/bin/ppc-linux-g++ -Wall -g -O2 -static titi.cc -o
titi_1.4.0_static for the "working" version)

GDB output is the following
------
> GNU gdb (GDB) 7.8.1
> Copyright (C) 2014 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "ppc-linux".
> Type "show configuration" for configuration details.
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>.
> Find the GDB manual and other documentation resources online at:
> <http://www.gnu.org/software/gdb/documentation/>.
> For help, type "help".
> Type "apropos word" to search for commands related to "word"...
> Reading symbols from ./titi_1.4.0_no_static...done.
> (gdb) run
> Starting program: /root/titi_1.4.0_no_static
> warning: Could not load shared library symbols for linux-vdso32.so.1.
> Do you need "set solib-search-path" or "set sysroot"?
>
> Program received signal SIGABRT, Aborted.
> 0x0fb6193c in raise () from /lib/libc.so.6
> (gdb) bt
> #0  0x0fb6193c in raise () from /lib/libc.so.6
> #1  0x0fb6324c in abort () from /lib/libc.so.6
> #2  0x0fce3c44 in uw_init_context_1 () from /lib/nof/libgcc_s.so.1
> #3  0x0fce43e8 in _Unwind_RaiseException () from /lib/nof/libgcc_s.so.1
> #4  0x0fec2f90 in __cxa_throw () from /lib/nof/libstdc++.so.6
> #5  0x10000aac in toto::do_toto (address@hidden) at titi.cc:16
> #6  0x10000758 in main (argc=<optimized out>, argv=<optimized out>) at 
> titi.cc:28
-------


After checking that no library was missing on the target, exploring compilation
logs, i managed to find that compiling with :
> ppc-linux-g++ -Wall -g -O2 titi.cc -o titi_1.4.0_no_static -Wl,lc
end with working exceptions.


The cross compiler was built with binutils 2.26 (binutils 2.27 and binutils
2.28 have also been tried).
cross compiler GCC is :
> ppc-linux-gcc -v
> Using built-in specs.
> COLLECT_GCC=ppc-linux-gcc
> COLLECT_LTO_WRAPPER=/opt/cldk-1.4.0/libexec/gcc/ppc-linux/5.4.0/lto-wrapper
> Target: ppc-linux
> Configured with: /root/cldk/gcc-5.4.0/configure --target=ppc-linux 
> --with-headers=yes --with-cpu=860 --prefix=/opt/cldk-1.4.0 
> --bindir=/opt/cldk-1.4.0/bin --sbindir=/opt/cldk-1.4.0/sbin 
> --libexecdir=/opt/cldk-1.4.0/libexec --datadir=/opt/cldk-1.4.0/share 
> --sysconfdir=/opt/cldk-1.4.0/etc --libdir=/opt/cldk-1.4.0/lib 
> --includedir=/opt/cldk-1.4.0/usr/include 
> --oldincludedir=/opt/cldk-1.4.0/usr/include 
> --infodir=/opt/cldk-1.4.0/share/info --mandir=/opt/cldk-1.4.0/share/man 
> --with-glibc-version=2.18 --enable-languages=c,c++
> Thread model: posix
> gcc version 5.4.0 (GCC)

with glibc 2.23.



binutils itself was built using :
> gcc -v
> Using built-in specs.
> Target: x86_64-redhat-linux
> Configured with: ../configure --prefix=/usr --mandir=/usr/share/man 
> --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla 
> --enable-bootstrap --enable-shared --enable-threads=posix 
> --enable-checking=release --with-system-zlib --enable-__cxa_atexit 
> --disable-libunwind-exceptions --enable-gnu-unique-object 
> --enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk 
> --disable-dssi --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre 
> --enable-libgcj-multifile --enable-java-maintainer-mode 
> --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --disable-libjava-multilib 
> --with-ppl --with-cloog --with-tune=generic --with-arch_32=i686 
> --build=x86_64-redhat-linux
> Thread model: posix
> gcc version 4.4.7 20120313 (Red Hat 4.4.7-17) (GCC)


Cheers,
Marc

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