gcc中关于C/C++标准的选项
man gcc里面说到gcc使用指定的标准编译C/C++的选项是：-std=standard，其中standard可以是
c89（传说中的c89）
iso9899:1990
Support all ISO C90 programs (certain GNU extensions that conflict with ISO C90
are disabled). Same as -ansi for C code.
iso9899:199409
ISO C90 as modified in amendment 1.
c99（传说中的c99）
c9x
iso9899:1999
iso9899:199x
ISO C99. Note that this standard is not yet fully supported; see
<http://gcc.gnu.org/gcc-4.2/c99status.html> for more information. The names c9x
and iso9899:199x are deprecated.
gnu89
GNU dialect of ISO C90 (including some C99 features). This is the default for C code.
gnu99
gnu9x
GNU dialect of ISO C99. When ISO C99 is fully implemented in GCC, this will
become the default. The name gnu9x is deprecated.
c++98
The 1998 ISO C++ standard plus amendments. Same as -ansi for C++ code.
gnu++98
GNU dialect of -std=c++98. This is the default for C++ code.
还有一个选项就是-ansi，上面也说到了。
以上是在gcc4.2.4里面看到的。
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