gcc 相關

http://gcc.gnu.org/onlinedocs/gcc-3.2/gcc/

__attribute__

The keyword __attribute__ allows you to specify special attributes of variables or structure fields. This keyword is followed by an attribute specification inside double parentheses.


關鍵字__attribute__允許我們指定變量或結構體內各個域的屬性。使用時在__attribute__後面加上被雙括號括起來的屬性說明




     unused

          This attribute, attached to a variable, means that the variable is meant to be possibly unused. GCC will not produce a warning for this variable

          int unuse __attribute__ ((unused));

 http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function-Attributes

       constructor

    destructor    constructor (priority)    destructor (priority)    用於函數修飾。constructor修飾的函數在main之前運行，若帶priority（整數），則priority小的先運行。destructor修飾的函數在main執行後或exit調用後     執行，若帶priority（整數），執行順序與constructor相反，大的先執行    用法：  1、            __atribute((constructor(101))) void func()           {              ...           }            2、           void func() __atribute((constructor(101)));                      void func()           {              ...           }

setlocale

http://www.cnblogs.com/hnrainll/archive/2011/05/07/2039700.html

On program startup, the locale selected is the "C" locale, which is the same as would be set by calling setlocale(LC_ALL,"C").

LC_CTYPE

Affects character handling functions (all functions of <cctype>, except isdigit and isxdigit), and the multibyte and wide character functions.