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https://stackoverflow.com/questions/4873565/how-big-is-wchar-t-with-gcc
GCC supports -fshort-wchar that switches wchar_t from 4, to two bytes. What is the best way to detect the size of wchar_t at compile time, so I can map it correctly to the appropriate utf-16 or ut...
http://gcc.gnu.org/ml/gcc-help/2009-11/msg00128.html
In my c++config.h on my Linux machine with gcc > 4.1.2, _GLIBCXX_USE_WCHAR_T is defined. So I don't have wstring support > problem on Linux. My question now are > 1. Is it possible to have Cygwin 1.5 or 1.7 to support wstring? > 2. If it's possible how to build entire gcc or just libstdc++ if that > works. Seems like Mingw works. But I can't ...
https://cygwin.org/ml/cygwin/2009-06/msg00897.html
Subject: How to build gcc to support wchar_t and wstring on Cygwin; Hi, wstring is not supported on my Cygwin 1.5.25. When I declare a wstring variable my g++ 3.4.4 complains wstring is undeclared. After reading some posted message I figured out wstring is not supported on Cygwin 1.5 or even 1.7. To fix this I have to rebuild entire gcc.
https://sourceware.org/bugzilla/show_bug.cgi?id=15551
So I think that, even if GLIBC is never going to support -fshort-wchar, WCHAR_MIN and WCHAR_MAX must be correct. The value must be given by the compiler. [Note: Those macros can be used to disable prototypes for wchar functions, if the size of wchar_t is not the one of the GLIBC ABI] Regards.
https://gcc.gnu.org/onlinedocs/gcc/Code-Gen-Options.html
3.16 Options for Code Generation Conventions. ... Warning: the -fshort-wchar switch causes GCC to generate code that is not binary compatible with code generated without that switch. Use it to conform to a non-default application binary interface. ... For those adding visibility support to existing code, you may find #pragma GCC visibility of use.
https://stackoverflow.com/questions/3772179/what-does-the-prefix-l-stand-for-in-gcc-c-without-including-wchar
On Windows, wchar_t was defined as 16-bit way back in the early days of Unicode where it was intended to be a 16-bit character set. Unfortunately this turned out to be a bad decision (it makes it impossible for the C compiler to support non-BMP Unicode characters in a way that conforms to the C standard), but they were stuck with it.
http://www.firstobject.com/wchar_t-string-on-linux-osx-windows.htm
Making wchar_t work on Linux, OS X and Windows for CMarkup release 10.1 I learned a couple of humble lessons, and I expect I'll be posting more here as I get feedback. To me the term wchar_t string is the same as C++ wide string, C++ wide char, C++ wchar, C++ wide character string, etc, which all come down to an array of wchar_t.
https://gcc.gnu.org/c99status.html
Status of C99 features in GCC. C99 is substantially completely supported as of GCC 4.5 (with -std=c99 -pedantic-errors used; -fextended-identifiers also needed to enable extended identifiers before GCC 5), modulo bugs and floating-point issues (mainly but not entirely relating to optional C99 features from Annexes F and G). The following table gives more details of the C99 support in different ...
http://gcc.gnu.org/ml/gcc-help/2009-11/msg00130.html
Re: How to build gcc to support wchar_t and wstring on Cygwin. From: "John (Eljay) Love-Jensen" <eljay at adobe dot com> To: fwgx <paul dot phillips at ultra-scs dot com>, GCC-help <gcc-help at gcc dot gnu dot org>, "qihongwang at gmail dot com" <qihongwang at gmail dot com> Date: Thu, 12 Nov 2009 04:51:32 -0800
https://gcc.gnu.org/onlinedocs/gcc/Option-Index.html
Option Index. GCC’s command line options are indexed here without any initial ‘-’ or ‘--’.Where an option has both positive and negative forms (such as -foption and -fno-option), relevant entries in the manual are indexed under the most appropriate form; it may sometimes be useful to look up both forms.
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