[Bug target/24012] [6/7/8/9 regression] #define _POSIX_C_SOURCE breaks #include <iostream>

[redi at gcc dot gnu.org]

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

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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   Target Milestone|8.3                         |---