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POAny improvements on the GCC/Windows DLLs/C++ STL front?
 

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  1. POAny improvements on the GCC/Windows DLLs/C++ STL front?
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    <p>Yesterday, I got bit by a rather annoying crash when using DLLs compiled with GCC under Cygwin. Basically, as soon as you run with a debugger, you may end up landing in a debugging trap caused by RtlFreeHeap() receiving an address to something it did not allocate.</p> <p>This is a <a href="http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24196" rel="nofollow noreferrer">known bug with GCC 3.4</a> on Cygwin. The situation arises because the libstdc++ library includes a "clever" optimization for empty strings. I spare you the details (see the references throughout this post), but whenever you allocate memory in one DLL for an std::string object that "belongs" to another DLL, you end up giving one heap a chunk to free that came from another heap. Hence the <strong>SIGTRAP in RtlFreeHeap()</strong>.</p> <p>There are other problems reported when exceptions are thrown across DLL boundaries.</p> <p>This makes GCC 3.4 on Windows an unacceptable solution as soon as your project is based on DLLs and the STL. I have a few options to move past this option, many of which are very time-consuming and/or annoying:</p> <ul> <li>I can <a href="http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24196#c11" rel="nofollow noreferrer">patch my libstdc++</a> or <a href="http://gcc.gnu.org/ml/libstdc++/2004-09/msg00232.html" rel="nofollow noreferrer">rebuild it with the --enable-fully-dynamic-string</a> configuration option</li> <li>I can use static libraries instead, which increases my link time</li> </ul> <p>I cannot (yet) switch to another compiler either, because of some other tools I'm using. The comments I find from some GCC people is that "it's almost never reported, so it's probably not a problem", which annoys me even more.</p> <p><strong>Does anyone have some news about this?</strong> I can't find any clear announcement that this has been fixed (the bug is still marked as "assigned"), except one comment on the <a href="http://www.gnuradio.org/trac/ticket/48" rel="nofollow noreferrer">GNU Radio bug tracker</a>.</p> <p>Thanks!</p>
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    1. USCarl Seleborg
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      1. POAny improvements on the GCC/Windows DLLs/C++ STL front?
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    1. COTo be honest, if somebody was using an old version of a compiler I was maintaining, and reported a bug almost nobody else reported (known or not), I'd probably react much the same. I don't think a commercial compiler team would do anything differently.
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      1. POAny improvements on the GCC/Windows DLLs/C++ STL front?
      1. USDavid Thornley
    2. COGood point! Problem is, on Cygwin, GCC 3 is still the official compiler, GCC 4.3.2 is available as "alphaware". I'm going down that path now, but I am a bit frustrated that Windows be considered a second-class platform by the GCC community.
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      1. POAny improvements on the GCC/Windows DLLs/C++ STL front?
      1. USCarl Seleborg
    3. CO(Forgot:) At least for C++.
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      1. USCarl Seleborg
 

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