On Tue, Jul 15, 2008 at 5:57 PM, Ian Lance Taylor <[EMAIL PROTECTED]> wrote: > "Peng Yu" <[EMAIL PROTECTED]> writes: > >> There is an options -ansi to make g++ ANSI compatible. I'm wondering >> if there is an option to make g++ POSIX compatible. Or g++ is already >> POSIX compatible without an option? > > POSIX itself specifies features macros which you may define to compile > your source code in a strict POSIX environment. These are > _POSIX_SOURCE and _POSIX_C_SOURCE. These affect the header files > rather than the libraries. To get a strict POSIX compiler, use those > in conjunction with -ansi or -std.
Hi Ian, Isn't ANSI C++ a subset of POSIX C++. Why do I need to specify _POSIX_SOURCE, _POSIX_C_SOURCE and -ansi? Would you please let me know what is the difference between the option -ansi and -std? Thanks, Peng
