[Bug target/24012] [3.4/4.0/4.1 regression] #define _POSIX_C_SOURCE breaks #include <iostream>

[gerald at pfeifer dot com]

------- Additional Comments From gerald at pfeifer dot com  2005-09-24 16:34 -------
Historically, on some systems one had to define _POSIX_C_SOURCE to get at
fileno(), which has been used by code generated by flex() and probably others.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24012