Merge 663ea4e70c into 1df5d726d9

doc/help.md

@@ -0,0 +1,49 @@
+## error: 'to_string' is not a member of 'std'
+
+This is an error that might come up when using certain GNU based compilers, including:
+
+* MinGW 4.7, 4.8
+* Android NDK
+* ...
+
+This is not an issue with this json tool, but rather with the compiler itself. Here's how I fixed it, thanks to [this page](http://tehsausage.com/mingw-to-string). I do not guarantee that this will work, only that it worked for me.
+
+### mingw/include/wchar.h, mingw/include/stdio.h
+
+(This same snippet needs replacing in two header files)
+
+```
+-/* These differ from the ISO C prototypes, which have a maxlen parameter like snprintf.  */
+-#ifndef __STRICT_ANSI__
+-_CRTIMP int __cdecl __MINGW_NOTHROW    swprintf (wchar_t*, const wchar_t*, ...);
+-_CRTIMP int __cdecl __MINGW_NOTHROW    vswprintf (wchar_t*, const wchar_t*, __VALIST);
+-#endif
++__CRT_INLINE int __cdecl __MINGW_NOTHROW swprintf (wchar_t* buffer, size_t count, const wchar_t* format, ...)
++{
++  __builtin_va_list argptr;
++  __builtin_va_start(argptr, format);
++  return _vsnwprintf(buffer, count, format, argptr);
++}
++
++__CRT_INLINE int __cdecl __MINGW_NOTHROW vswprintf (wchar_t* buffer, size_t count, const wchar_t* format, __VALIST argptr)
++{
++  return _vsnwprintf(buffer, count, format, argptr);
++}
+```
+
+### mingw\lib\gcc\mingw32\4.7.0\include\c++\mingw32\bits\os_defines.h
+
+This preprocessor flag needs to be removed
+
+```
+-#define _GLIBCXX_HAVE_BROKEN_VSWPRINTF 1
+```
+
+### MinGW\lib\gcc\mingw32\4.8.1\include\c++\mingw32\bits\c++config.h
+
+This may or may not be necessary, but if so, then makefiles will require `-std=gnu++11` too.
+
+```
+-/* #define _GLIBCXX_USE_C99 1 */
++#define _GLIBCXX_USE_C99 1
+```