2c66a4ced9
Feature test macros should be used to inform the C library what functions a program _expects_ to be available (and which should be made available to it), not as checks for what functions are available to be used. Therefore, it is necessary to set _POSIX_C_SOURCE to 200809L, which indicates we wish to use functions defined in POSIX.2008, one of which is `int strerror_r()`. This way, all libc (including glibc, as long as _GNU_SOURCE is undefined) implementations will make the correct version of the function available, and the fallback to the `char *strerror_r()` version is no longer necessary. |
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