Re: [Mingw-users] MinGW + DLL + Virtual member functions + Missing exports

[<dan...@ya...>]

 --- Dinand Vanvelzen > wrote: 
> 1) C:\Dev-Cpp\bin>g++.exe -v
> 
> Reading specs from ../lib/gcc-lib/mingw32/3.2.3/specs
> Configured with:
> ../gcc/configure --with-gcc --with-gnu-ld --with-gnu-as --host=
> mingw32 --target=mingw32 --prefix=/mingw --enable-threads --disable-nls --en
> able
> -languages=c++,f77,objc --disable-win32-registry --disable-shared --enable-s
> jlj-
> exceptions
> Thread model: win32
> gcc version 3.2.3 (mingw special 20030504-1)
> 
> 2) We have been working on a testcase but have problems repoducing the
> problem.
> As of yet we do not know what causes the problem to begin which is why I
> posted.
> If we knew the cause we might be able to fix it, unless it's a compiler bug
> offcourse.
> 

OK.  One compiler bug that may cause problem is that declaration of class as friend
override earlier dll[im/ex]port attribute.  
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11005

Another reason that a method may not be exported is that it is an inline function. Inline
functions are exported from neither static nor dynamic libs, unless -fkeep-inline switch
is used.

If there is problem with virtual methods, it would good to know about it so that it can 
be tracked down.  In absence of s small self-conatined testcase, you may also
use g++ -save-temps and submit the prepocesser output  (the *.ii file)  with a bug
report to  mingw's bug tracker at:

https://sourceforge.net/tracker/?func=add&group_id=2435&atid=102435

Danny

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