FAQ

Frequently Asked Questions

Installation:

• Q: What file should I download? / What do the names mean? Answer
• Q: How do I install the binary package in my environment? Answer

Compilation:

• Q: How do I compile the runtime? Answer
• Q: How do I compile Unicode Applications? Answer
• Q: How do I compile multilib toolchain? Answer
• Q: How can I check for mingw-w64 headers? Answer
• Q: Why get I build failures in gcc's libstdc++ build? Answer
• Q: How can I generate an import library for a DLL? Answer
• Q: How do I use LTO (Link Time Optimization) in GCC? Answer
• Q: How do I make use of PPL and CLooG in GCC? Answer
• Q: Why doesn't printf and scanf family work as defined in C99? Answer
• Q: How do I compile with pthreads? Answer
• Q: Why do I get redefinition errors against winsock.h when I include winsock2.h? Answer
• Q: Why doesn't mingw-w64 gcc support Dwarf-2 Exception Handling? Answer
• Q: How do I fix "__mingw_aligned_malloc not declared in this scope"? Answer
• Q: How do I use "%llu" in printf? Answer
• Q: I get some errors with C++11 to_string when building/using GCC, what gives? Answer
• Q: What are default manifest files and why do they matter? Answer

Execution:

• Q: Which compiler executable should I use? Answer
• Q: What does error 0xc000007b mean? Answer
• Q: What does Procedure entry point XXX not located in Dynamic Link Library mean? Answer
• Q: Why isn't gdb able to display symbols from DLLs? Answer
• Q: Why does GDB crash with "thread.c:79: internal-error"? Answer
• Q: Why do some 32-bit MinGW-w64 applications fail with '... _vswprintf could not be located in the dynamic link library msvcrt.dll'? Answer
• Q: Why crashes my 64 bit program when using a MSVC-generate x64 *.lib file? Answer

Back

[amiaogong]

How I convert a .a which was written by c++ convert to lib which can be used by vc6 or vs2010? the c++ program has some class which the vc6 or vs2010 want to import from mingw 's .a.
thanks.

[Kai Tietz]

2014-10-27 15:59 GMT+01:00 amiaogong amiao@users.sf.net:

How I convert a .a which was written by c++ convert to lib which can be used
by vc6 or vs2010? the c++ program has some class which the vc6 or vs2010
want to import from mingw 's .a.
thanks.

In general there is no need to convert .a into .lib, as both are using
same file-format. So if you have troubles with .a, rename it to .lib
and you are done with necessary conversion.

For C++ there is simply to say, this isn't possible due
name-decoration differences. You would need to convert name-mangling.

[Mathieu Fregeau]

Is there a tool to update the Mingw libraries? Most importantly the compiler itself (g++, gcc) and all related to the toolchain? (without having to reinstall Mingw, because usually since it was first installed, many packages have been added afterwards). Under Msys2 one can do pacman -Suyy but that does not update anything on the Mingw64 folder