Undeclared functions when feature test macros are defined
A number of functions such as fileno are not declared in the headers if STRICT_ANSI is defined, which has the side effect that they won't be declared when compiling with -std=c99 -D_POSIX_SOURCE like on other platforms.
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A number of functions such as fileno are not declared in the headers if STRICT_ANSI is defined, which has the side effect that they won't be declared when compiling with -std=c99 -D_POSIX_SOURCE like on other platforms.