[Bug c++/49587] New: Code generation error with dynamic libraries.

[Bug c++/49587] New: Code generation error with dynamic libraries.

[jarrydb at cse dot unsw.edu.au]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49587

           Summary: Code generation error with dynamic libraries.
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: jarrydb@cse.unsw.edu.au


I have a rather large piece of code (about 20,000 lines) which doesn't appear
to be compiled correctly. I can't reproduce the error, but I have found the
revision that breaks it, and I can describe roughly what the error is.

The last revision that works is 175340, it is broken in 175341.

Initially the bug surfaced as the instruction pointer trying to execute address
0x0. After further digging (with gdb, running instruction by instruction) I
discovered that at a function call, which was in a dynamic library, upon trying
to resolve the address of the function, it found that the function was at
address zero. It got to the particular function call, went through the dynamic
library lookup table, then it dies.

[Bug c++/49587] Code generation error with dynamic libraries.

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49587

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2011.06.30 09:58:10
     Ever Confirmed|0                           |1

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-06-30 09:58:10 UTC ---
We need a testcase and more information like used compile flags and compiler
version.

[Bug c++/49587] Code generation error with dynamic libraries.

[jarrydb at cse dot unsw.edu.au]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49587

--- Comment #2 from Jarryd Beck <jarrydb at cse dot unsw.edu.au> 2011-06-30 10:16:58 UTC ---
I wish that I could give you a test case. I can't reproduce it on any small
piece of code. The only code that I can get it to break on is my project which
has about 20,000 lines of code. It has nearly 100 files and uses boost spirit.
It compiles into a library and several executables.

The compiler version I already stated. It's gcc svn, the first broken revision
is 175341 (maybe that wasn't clear).

The flags used for compiling are simply -fPIC for the library and nothing extra
for the executables.

Another thing to note is that I moved the function call in which the error
occurs to later in my code, and a different function bombed in exactly the same
way.

How would you like me to proceed?

[Bug c++/49587] Code generation error with dynamic libraries.

[jarrydb at cse dot unsw.edu.au]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49587

--- Comment #3 from Jarryd Beck <jarrydb at cse dot unsw.edu.au> 2011-06-30 11:52:52 UTC ---
Sorry I better get that function in the dynamic loading correct. It calls the
actual function which goes to _dl_runtime_resolve which calls _dl_fixup, then
it bombs at the end of _dl_runtime_resolve.

[Bug c++/49587] Code generation error with dynamic libraries.

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49587

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-06-30 16:43:08 UTC ---
Most likely a dup of bug 49538.

[Bug c++/49587] Code generation error with dynamic libraries.

[jarrydb at cse dot unsw.edu.au]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49587

--- Comment #5 from Jarryd Beck <jarrydb at cse dot unsw.edu.au> 2011-06-30 20:56:32 UTC ---
Ah, yes I think it is.

[Bug c++/49587] Code generation error with dynamic libraries.

[jarrydb at cse dot unsw.edu.au]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49587

Jarryd Beck <jarrydb at cse dot unsw.edu.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|                            |DUPLICATE

--- Comment #6 from Jarryd Beck <jarrydb at cse dot unsw.edu.au> 2011-07-10 12:20:26 UTC ---
It is definitely a duplicate of bug 49538 which is fixed now, and my problem is
fixed. So I am marking this as resolved.

*** This bug has been marked as a duplicate of bug 49538 ***