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Re: -std=c++0x break build on MinGW and wxWidgets 2.9.4
On 11/14/2012 08:29 PM, Wayne Stambaugh wrote:
> On 11/14/2012 9:05 PM, Dick Hollenbeck wrote:
>> Really, even of you are inclined to say that MingW simply does not expose _strdup() or
>> strdup() when __STRICT_ANSI__
>> is defined, because of this in mingw's string.h:
>> #ifndef __STRICT_ANSI__
>> _CRTIMP char* __cdecl __MINGW_NOTHROW _strdup (const char*) __MINGW_ATTRIB_MALLOC;
>> You still have to blame the wx folks for not working around the problem which pops up when
>> using -std=c++0x.
>> It looks like wx might be poised to provide their own
>> #ifndef wxCRT_StrdupA
>> WXDLLIMPEXP_BASE char *wxCRT_StrdupA(const char *psz);
>> under some circumstances. This is one path to solution, but another one is to simply
>> provide a function prototype for _strdup() somewhere. It is not like the function has
>> disappeared from MingW runtime libraries. It is still there and you could link to it no
> We could do one of these solutions but JP's commit using -std-gnuc++0x
> fixed this problem on MinGW but added it's own problem with the Boost
> polygon library. I also confirmed the Boost library problem exits on
> Linux using GCC 4.7.1 so I'm not sure the best course of action at this
> point. Do we remove the -std-gnuc++0x flag and use your original
> -std-c++0x flag and use one of the solutions you proposed or do we try
> to figure out why GCC 4.7.1 on Linux and GCC 4.7.2 on MinGW (most likely
> the 4.7 branch of GCC) fail to properly build Boost polygon. If I get
> some time tomorrow, I'll see if I can figure out the problem. At this
> point I cannot build KiCad on either platform.
What is the problem with building on Linux, this has not been explained clearly.
Does -std-C++0x not work on Linux with your 4.7.1?
Clearly there is a bug in wx, and it seems to be MingW gcc compiler version dependent,
because the MingW guys have hidden _strdup() and company only after a certain version when
__STRICT_ANSI_ is defined, and the wx guys have yet to catch up with that change.