Compiling ACE 5.3 testcase Service_Config_DLL.cpp causes ICE using MinGW under cygwin

["Michael H. Cox" <mhcox at bluezoosoftware dot com>]

Below is an ACE problem report containing all the pertinent information.
The distilled code produces an internal compiler error in g++, so I assume
the bug is primarily in GCC.  There is some strangeness in the ACE code that
*defines* a function as a dllimport when it probably should be a dllexport.
See below for the details...

    ACE VERSION: 5.3

    HOST MACHINE and OPERATING SYSTEM:
    Pentium III 800MHz w/128MB and two SCSI hard drives: one mounted as
    C: the other mounted as a volume at C:\home.

    Full cygwin 1.3.18-1 install running under Win2K Advanced Server SP3
    using WINSOCK 2.0 (5.00.2195.4874).  Cygwin installed at C:\cygwin
    and Win2K volume mounted at C:\home.  C:\home is mounted at /home
    under the cygwin environment.  Environment variable ACE_ROOT set to
    "c:/home/mhcox/projects/build/ACE-TAO/ACE_wrappers".

    TARGET MACHINE and OPERATING SYSTEM, if different from HOST: Same.

    COMPILER NAME AND VERSION (AND PATCHLEVEL): g++ -v output:
Reading specs from c:/MinGW/bin/../lib/gcc-lib/mingw32/3.2/specs
Configured with: ../gcc/configure --with-gcc --with-gnu-ld --with-gnu-as
--host=mingw32 --target=mingw32 --prefix=/mingw --enable-threads --disable-n
ls
--enable-languages=f77,c++,objc,ada --disable-win32-registry --disable-share
d
Thread model: win32
gcc version 3.2 (mingw special 20020817-1)

    Note:  this is NOT the cygwin compiler, but mingw32 2.0.0-3
    (GCC 3.2 equivalent) with patch packages (binutils-2.13.90-20021006-2,
    mingw-runtime-2.3, and w32api-2.1) from from mingw.org.  Installed at
    C:\MinGW and cygwin mounted at /mingw.  Environment variable MINGW_BASE
    is set to "C:\MinGW".

    CONTENTS OF $ACE_ROOT/ace/config.h:
// Should this be in config-g++-common.h for __GNU__>2?
#define ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION
#include "ace/config-win32.h"

    CONTENTS OF $ACE_ROOT/include/makeinclude/platform_macros.GNU (unless
    this isn't used in this case, e.g., with Microsoft Visual C++):
exceptions=1
rtti=1
include $(ACE_ROOT)/include/makeinclude/platform_mingw32.GNU

    AREA/CLASS/EXAMPLE AFFECTED:


    DOES THE PROBLEM AFFECT:
        COMPILATION?  Yes.
        LINKING?  No.
            On Unix systems, did you run make realclean first?  Yes.
        EXECUTION?  No.
        OTHER (please specify)? N/A, only affects ACE.

    SYNOPSIS:
    Compiling testcase Service_Config_DLL.cpp causes ICE using MinGW
compiler
    under cygwin.


    DESCRIPTION:
    While trying to build ACE+TAO using the MinGW compiler under cygwin, the
    compiler had an internal compiler error.  See the code below to
reproduce.

    REPEAT BY:
    Compiling the following source distilled from Service_Config_DLL.cpp
will
    cause an ICE using the command line "g++ ICE.cpp":
// ICE.cpp: Distilled version of test case Service_Config_DLL.cpp from
// ACE 5.3 that causes an ICE in g++ 3.2 mingw:
// ICE.cpp: In function `void _make_Service_Config_DLL(void*)':
// ICE.cpp:24: Internal compiler error in rest_of_compilation, at
toplev.c:3491
// Please submit a full bug report,
// with preprocessed source if appropriate.
// See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.

extern "C"
{
 __attribute__((dllimport)) void _make_Service_Config_DLL (void *);
  typedef void (*ACE_SERVICE_ALLOCATOR) (void *);
}

// Commenting out the line of code below changes ICE to a syntax error:
// ICE.cpp:22: function `void _make_Service_Config_DLL(void*)' definition is
marked dllimport
ACE_SERVICE_ALLOCATOR alloc_ = &_make_Service_Config_DLL;

// This should probably be __attribute__((dllexport)), but even changing it
// still produces ICE.
extern "C" __attribute__((dllimport))
void _make_Service_Config_DLL (void *gobbler)
{
}
//EOF

    SAMPLE FIX/WORKAROUND:
    N/A.