getaddrinfo开启c99后无法编译

原因

开启了c99后，gcc采用严格标准c(__STRICT_ANSI)，而getaddrinfo是POSIX定义的，
所以无法使用，具体可查看/usr/include/netdb.h，/usr/include/features.h

摘取:

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The `-ansi' switch to the GNU C compiler, and standards conformance
options such as `-std=c99', define __STRICT_ANSI__.  If none of
these are defined, or if _DEFAULT_SOURCE is defined, the default is
to have _SVID_SOURCE, _BSD_SOURCE, and _POSIX_SOURCE set to one and
_POSIX_C_SOURCE set to 200809L.  If more than one of these are
defined, they accumulate.  For example __STRICT_ANSI__,
_POSIX_SOURCE and _POSIX_C_SOURCE together give you ISO C, 1003.1,
and 1003.2, but nothing else.

参考

  1. https://groups.google.com/d/msg/gnu.gcc.help/a88eE4Ga73o/P3vji9iM5pwJ

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