[Mingw-notify] [ mingw-Bugs-2373234 ] Latest MingW download breaks g++ -ansi option

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Bugs item #2373234, was opened at 2008-12-02 04:13
Message generated for change (Comment added) made by eldhaberunit
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Category: MinGW
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Mark Cave-Ayland (cavey)
Assigned to: Nobody/Anonymous (nobody)
Summary: Latest MingW download breaks g++ -ansi option

Initial Comment:
Hi everyone,

I've been using a MingW 4 installation for a couple of years, and have recently started again by downloading the Windows installer and grabbing the latest versions of MingW and MSYS at the time of writing. However, I have noticed a regression in that one of the libraries I regularly compile with MingW now fails with the following error:


In file included from 
C:/mingw/bin/../lib/gcc/mingw32/3.4.5/../../../../include/
c++/3.4.5/bits/postypes.h:46,
                 from 
C:/mingw/bin/../lib/gcc/mingw32/3.4.5/../../../../include/
c++/3.4.5/iosfwd:50,
                 from 
C:/mingw/bin/../lib/gcc/mingw32/3.4.5/../../../../include/
c++/3.4.5/ios:44,
                 from 
C:/mingw/bin/../lib/gcc/mingw32/3.4.5/../../../../include/
c++/3.4.5/ostream:45,
                 from 
C:/mingw/bin/../lib/gcc/mingw32/3.4.5/../../../../include/
c++/3.4.5/iostream:45,
                 from test.cpp:1:
C:/mingw/bin/../lib/gcc/mingw32/3.4.5/../../../../include/c++/3.4.5/cwchar:161:
error: `::swprintf' has not been declared
C:/mingw/bin/../lib/gcc/mingw32/3.4.5/../../../../include/c++/3.4.5/cwchar:168:
error: `::vswprintf' has not been declared


With some detective work, I managed to find out that the problem is due to the fact that g++ is invoked in ANSI mode with the -ansi parameter that the compilation fails. The error can easily be reproduced by compiling a simple "Hello World" program called test.cpp like this:


#include <iostream>

using namespace std;

main()
{
    cout << "Hello World";
}


with the following command line:


g++ -ansi -o test.exe test.cpp


After a bit of fiddling, I found that I was able to get my test program above to compile in ANSI mode by loading include/c++/3.4.5/cwchar and commenting out the lines containing "using ::swprintf" and "using ::vswprintf".

I think that this related to the fact that the swprintf() and vswprintf() functions in wchar.h are surrounded by an "#ifndef __STRICT_ANSI__" declaration; however I am not sure whether or not surrounding the "using" lines mentioned above with the same declaration is the correct thing to do in C++.


Many thanks,

Mark.


----------------------------------------------------------------------

Comment By: eldhaber unit (eldhaberunit)
Date: 2009-03-13 00:03

Message:
the modification i made fixed the problem after i surrounded using
::swprintf and using ::vswprintf by #ifndef __STRICT_ANSI__

----------------------------------------------------------------------

Comment By: eldhaber unit (eldhaberunit)
Date: 2009-03-12 23:59

Message:
hi there!
in file cwchar, i enclosed using ::swprintf and using ::vswprintf
statements with #ifndef __STRICT_ANSI__ and #endif
after doing this i was able to compile the above code in ANSI mode

----------------------------------------------------------------------

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