2010/7/15 Kai Tietz <[email protected]>:
> 2010/7/15 [email protected] <[email protected]>:
>> Hi
>> On 15/07/2010 8:47 PM, Prof Brian Ripley wrote:
>>> We're working towards switching over to post-April snapshots, but we
>>> have 1000s of R packages to recompile. A couple of those (so far)
>>> have thrown up header conflicts.
>>>
>>> Specifically for this report I used
>>> mingw-w64-1.0-bin_i686-mingw_20100702.zip but I first found the
>>> problem with a Linux cross-compiler snapshot. This is a distillation
>>> of a very much more complex issue involving BOOST headers.
>>>
>>> If I compile the two-line C++ file test.cpp
>>>
>>> #include<process.h>
>>> #include<cstdlib>
>>>
>>> with x86_64-w64-mingw32-g++ -c test.cpp I get
>>>
>>> In file included from test.cpp:2:0:
>>> e:/r/w64/gcc-4.5.1/lib/gcc/../../x86_64-w64-mingw32/include/c++/4.5.1/cstdlib:166:11:
>>> error: '::_Exit' has not been declared
>>> e:/r/w64/gcc-4.5.1/lib/gcc/../../x86_64-w64-mingw32/include/c++/4.5.1/cstdlib:204:22:
>>> error: '__gnu_cxx::_Exit' has not been declared
>>>
>>> This code works in the 20100405 snapshot (of 4.4.4). I have a simple
>>> workaround (#include<cstdlib> at the top of the affected files), but
>>> the code concerned is not mine and I don't believe that should be
>>> necessary. The conflict is caused by this block of code
>>>
>>> #ifndef _CRT_TERMINATE_DEFINED
>>> #define _CRT_TERMINATE_DEFINED
>>> void __cdecl __MINGW_NOTHROW exit(int _Code) __MINGW_ATTRIB_NORETURN;
>>> _CRTIMP void __cdecl __MINGW_NOTHROW _exit(int _Code)
>>> __MINGW_ATTRIB_NORETURN;
>>>
>>> #pragma push_macro("abort")
>>> #undef abort
>>> void __cdecl __declspec(noreturn) abort(void);
>>> #pragma pop_macro("abort")
>>>
>>> #endif
>>>
>>> I'd welcome advice about the correct fix here.
>>>
>>> Brian Ripley
>>>
>>
>> I think if you build your own compiler and then you do --disable-c99
>> this problem will go away but the issue probably isn't there just
>> because of c99 enabled.
>> I have encountered this issue on another level of software where this
>> can be a header inclusion order problem or C99 get enabled problem.
>> I was investigating such compile problem and found that
>> incompatibilities when c99 enabled when you include C headers in mixed
>> fashion with C++ headers this problem tends to occur.
>> However, it can be simply work-around problem, or alternatively you can
>> disable-c99.
>> But it seems you're using the compiler by the buildbot...
>> Maybe someone else can shed more light on this issue.
>>
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>
> The issue is in libstdc++ headers. Here the _Exit doesn't get (as
> other runtime functions of stdlib.h) no put into std:: namespace. So
> this is an issue to be address to gcc bugzilla. AFAIR there is already
> a report for it, but I am not sure.
> I don't see here a good solution for this to fix this in our headers,
> but maybe someone of you have an idea how to solve it on our site.
>
> Regards,
> Kai
>
> --
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>
I see the issue in our headers. I prepare a fix for it soon. It would
be nice if you could test the patch, if it fixes your problem
(Committed at revision 2837 to trunk).
Thanks for reporting it,
Kai
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