http://d.puremagic.com/issues/show_bug.cgi?id=6012

           Summary: DMD version 1.064 and above causes segfaults in C
                    libraries
           Product: D
           Version: D1
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: regression
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: wallbraker@gmail.com


--- Comment #0 from Jakob Bornecrantz <wallbraker@gmail.com> 2011-05-15 17:04:55 PDT ---
A program that works perfectly fine with DMD versions 1.063 and below as well as GDC stops working with DMD 1.064.

Disassembling the code showed that the code was exactly the same in the calling D function for both versions of the compiler. I tried to create a small example but  failed.

Just working around the offending code caused failures in other calls to C libraries, tested the same code with DMD 1.063 and that worked with the workarounds still in place.

If I knew which git commits responds to each version I could do a bisect of the compiler.

Cheers Jakob.

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Jakob Bornecrantz <wallbraker@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|DMD                         |Phobos
            Summary|DMD version 1.064 and above |Phobos version 1.064 and
                   |causes segfaults in C       |above causes segfaults in C
                   |libraries                   |libraries


--- Comment #1 from Jakob Bornecrantz <wallbraker@gmail.com> 2011-05-15 18:22:55 PDT ---
So I built what I think where 3 different versions of the dmd D1 compiler from the git repository:

1.063 @ 960cfede4f63e1a730a11464827b70ecd714aaf4
1.064 @ 03309e5c0f05d7e599e847b2d89aa2a93a426304
1.065 @ 8fb6d9a935b7b51ca6caf8e26c94125fc317b434

All of these worked when I just dropped them into linux/bin/ of the dmd.1.063 release, this makes me believe that this is strangely enough a phobos issue.

Cheers Jakob.

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Jonathan M Davis <jmdavisProg@gmx.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jmdavisProg@gmx.com


--- Comment #2 from Jonathan M Davis <jmdavisProg@gmx.com> 2011-05-15 18:41:31 PDT ---
You're going to need to give more information than that. There isn't enough information here for anyone to even begin to look at the problem. You need to provide code samples.

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Jakob Bornecrantz <wallbraker@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID


--- Comment #3 from Jakob Bornecrantz <wallbraker@gmail.com> 2011-05-15 19:15:09 PDT ---
Ugh sorry for wasting your time. This is mostly my fault, it turns out that dmd 1.064 added "-L--export-dynamic" to DFLAGS.

Say a library Bar have a function called barFunc, now my bindings to the C libraries looked something like this:

extern (C) void (*barFunc)();

Which I then loaded with a library loader functions for that platform.

Now lets say library Foo is linked in and it uses function barFunc. The binding function in my program gets the symbol name _barFunc since its declared with extern(C). This worked in the past as none of those functions where exported by default, but when DMD 1.064 added "-L--export-dynamic" those pointers got exported. And they get resolved before any of the other normal functions causing the callee from Foo to jump to the pointer instead of the real function.

Either I just remove the "-L--export-dynamic" from dmd.conf or change the bindings to be this instead:

typedef extern (C) void function() pfn_BARFUNC;

pfn_BARFUNC barFunc;

Now barFunc gets a prober D symbol and things works again.

Cheers Jakob.

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--- Comment #4 from Jakob Bornecrantz <wallbraker@gmail.com> 2011-05-15 19:16:15 PDT ---
Forgot to add that I tested with DMD 1.068 both 32 and 64 bits and it works if I remove the flag, and does not work if its still there.

Cheers Jakob.

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