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(C++) BoostQt CreatorUbuntutoQt CreatorWindows wchar.h:718: error: expected initializer before 'throw' (while using i586-mingw32msvc)

 

Version of wchar.h:718: error: expected initializer before 'throw' when using i586-mingw32msvc.

 

Compile error (BEI 1) I encountered while busy solving How to cross-compile a Qt Creator project from Ubuntu to a windows executable: example 3: console application with a Boost library.

 

 

 

 

 

 

Quick solution

 

Re-install mingw32. For me, that solved this error, but still needed to solve the following error (stdio.h:430: error: expected initializer before 'throw').

 

 

 

 

 

System specifics

 

Operating system: Ubuntu 10.04 LTS Lucid Lynx

IDE: gedit

 

 

 

 

 

Source code: main.cpp

 

#include <iostream>
#include <string>
#include <vector>
//---------------------------------------------------------------------------
#include <boost/filesystem.hpp>
//---------------------------------------------------------------------------
//From http://www.richelbilderbeek.nl/CppGetFilesInFolder.htm
const std::vector<std::string> GetFilesInFolder(const std::string& folder)
{
  std::vector<std::string> v;

  const boost::filesystem::path my_folder
    = boost::filesystem::system_complete(
        boost::filesystem::path(folder));

  if (!boost::filesystem::is_directory(my_folder)) return v;

  const boost::filesystem::directory_iterator j;
  for ( boost::filesystem::directory_iterator i(my_folder);
        i != j;
        ++i)
  {
    if ( boost::filesystem::is_regular_file( i->status() ) )
    {
      const std::string filename = i->path().filename();
      //const std::string full_filename = folder + "/" + filename;
      v.push_back(filename);
    }
  }
  return v;
}
//---------------------------------------------------------------------------
//From http://www.richelbilderbeek.nl/CppGetPath.htm
const std::string GetPath(const std::string& filename)
{
  return boost::filesystem::path(filename).parent_path().string();
}
//---------------------------------------------------------------------------
int main(int, char* argv[])
{
  const std::vector<std::string> v = GetFilesInFolder(GetPath(argv[0]));
  std::copy(v.begin(),v.end(),std::ostream_iterator<std::string>(std::cout,"\n"));
  std::cout << "Number of files: " << v.size() << '\n';
}
//---------------------------------------------------------------------------

 

 

 

 

 

Process

 

Because I was trying to solve the Qt FAQ How to cross-compile a Qt Creator project from Ubuntu to a windows executable?, I compiled the code as follows:

 

i586-mingw32msvc-g++ -o MyWin.exe main.cpp -I/usr/include -I/usr/include/boost -L/usr/local/lib -lboost_filesystem

 

Or using the more elaborate form:

 

i586-mingw32msvc-g++ -V 4.4.2 -x c++ -o MyWin.exe main.cpp -I/usr/include -I/usr/include/boost -L/usr/local/lib -lboost_filesystem    

 

This resulted in the following screen output:

 

In file included from /usr/lib/gcc/i586-mingw32msvc/4.4.2/include/c++/cwchar:47,
                 from /usr/lib/gcc/i586-mingw32msvc/4.4.2/include/c++/bits/postypes.h:42,
                 from /usr/lib/gcc/i586-mingw32msvc/4.4.2/include/c++/iosfwd:42,
                 from /usr/lib/gcc/i586-mingw32msvc/4.4.2/include/c++/ios:39,
                 from /usr/lib/gcc/i586-mingw32msvc/4.4.2/include/c++/ostream:40,
                 from /usr/lib/gcc/i586-mingw32msvc/4.4.2/include/c++/iostream:40,
                 from main.cpp:11:
/usr/include/wchar.h:718: error: expected initializer before 'throw'
In file included from /usr/lib/gcc/i586-mingw32msvc/4.4.2/include/c++/bits/postypes.h:42,
                 from /usr/lib/gcc/i586-mingw32msvc/4.4.2/include/c++/iosfwd:42,
                 from /usr/lib/gcc/i586-mingw32msvc/4.4.2/include/c++/ios:39,
                 from /usr/lib/gcc/i586-mingw32msvc/4.4.2/include/c++/ostream:40,
                 from /usr/lib/gcc/i586-mingw32msvc/4.4.2/include/c++/iostream:40,
                 from main.cpp:11:
/usr/lib/gcc/i586-mingw32msvc/4.4.2/include/c++/cwchar:148: error: '::fwide' has not been declared
/usr/lib/gcc/i586-mingw32msvc/4.4.2/include/c++/cwchar:149: error: '::fwprintf' has not been declared
/usr/lib/gcc/i586-mingw32msvc/4.4.2/include/c++/cwchar:150: error: '::fwscanf' has not been declared
/usr/lib/gcc/i586-mingw32msvc/4.4.2/include/c++/cwchar:159: error: '::swprintf' has not been declared
/usr/lib/gcc/i586-mingw32msvc/4.4.2/include/c++/cwchar:160: error: '::swscanf' has not been declared
/usr/lib/gcc/i586-mingw32msvc/4.4.2/include/c++/cwchar:162: error: '::vfwprintf' has not been declared
/usr/lib/gcc/i586-mingw32msvc/4.4.2/include/c++/cwchar:166: error: '::vswprintf' has not been declared
/usr/lib/gcc/i586-mingw32msvc/4.4.2/include/c++/cwchar:170: error: '::vwprintf' has not been declared
/usr/lib/gcc/i586-mingw32msvc/4.4.2/include/c++/cwchar:200: error: '::wprintf' has not been declared
/usr/lib/gcc/i586-mingw32msvc/4.4.2/include/c++/cwchar:201: error: '::wscanf' has not been declared
In file included from /usr/lib/gcc/i586-mingw32msvc/4.4.2/include/c++/cstdio:45,
                 from /usr/lib/gcc/i586-mingw32msvc/4.4.2/include/c++/fstream:43,
                 from /usr/include/boost/filesystem/operations.hpp:32,
                 from /usr/include/boost/filesystem.hpp:16,
                 from main.cpp:15:
/usr/include/stdio.h:432: error: expected initializer before 'throw'
/usr/include/stdio.h:488: error: expected initializer before 'throw'

 

Zooming in on the first error:

 

/usr/include/wchar.h:718: error: expected initializer before 'throw'<br/>

 

Take a look at /usr/include/whar.h line 718:

 

extern int __REDIRECT (vswscanf, (__const wchar_t *__restrict __s,
  __const wchar_t *__restrict __format,
  __gnuc_va_list __arg), __isoc99_vswscanf)
     __THROW /* __attribute__ ((__format__ (__wscanf__, 2, 0))) */; //THIS LINE

 

It seems as if a re-throw (that is, a throw without arguments) is unsupported by i586-mingw32msvc-g++. Is it true that wchar.h is a C library file, as stated in its licence?

 

I tried to reinstall mingw:

 

sudo apt-get install mingw32

 

This solved this error, and replace it by the following:

 

In file included from /usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/cstdio:53,
                 from /usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/i586-mingw32msvc/bits/c++locale.h:49,
                 from /usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/iosfwd:45,
                 from /usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/ios:43,
                 from /usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/ostream:45,
                 from /usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/iostream:45,
                 from main.cpp:5:
/usr/include/stdio.h:430: error: expected initializer before 'throw'
/usr/include/stdio.h:488: error: expected initializer before 'throw'
In file included from /usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/cwchar:55,
                 from /usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/bits/postypes.h:46,
                 from /usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/iosfwd:49,
                 from /usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/ios:43,
                 from /usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/ostream:45,
                 from /usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/iostream:45,
                 from main.cpp:5:
/usr/include/wchar.h:718: error: expected initializer before 'throw'
In file included from /usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/bits/postypes.h:46,
                 from /usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/iosfwd:49,
                 from /usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/ios:43,
                 from /usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/ostream:45,
                 from /usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/iostream:45,
                 from main.cpp:5:
/usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/cwchar:153: error: '::fwide' has not been declared
/usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/cwchar:154: error: '::fwprintf' has not been declared
/usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/cwchar:155: error: '::fwscanf' has not been declared
/usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/cwchar:164: error: '::swprintf' has not been declared
/usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/cwchar:165: error: '::swscanf' has not been declared
/usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/cwchar:167: error: '::vfwprintf' has not been declared
/usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/cwchar:171: error: '::vswprintf' has not been declared
/usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/cwchar:175: error: '::vwprintf' has not been declared
/usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/cwchar:205: error: '::wprintf' has not been declared
/usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/include/c++/cwchar:206: error: '::wscanf' has not been declared

 

 

 

 

 

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