(C++) 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.

 

• Download the source code of 'CppCompileErrorWcharHexpectedInitializerBeforeThrow' (while using i586-mingw32msvc)(zip)

 

 

 

 

 

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

 

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#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:

 

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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:

 

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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:

 

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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:

 

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

 

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

 

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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:

 

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sudo apt-get install mingw32

 

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

 

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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