Gavin Smith wrote: > so it sounds like we are better off using #undef before > including the Perl headers to avoid depending on undocumented > functionalities. Thanks.
Using #undef means to decline all corrections done by Gnulib. These are documented in the manual. For example, for 'fdopen' [1] we have documented Portability problems fixed by Gnulib: This function crashes when invoked with invalid arguments on some platforms: MSVC 14. On Windows platforms (excluding Cygwin), this function does not set errno upon failure. So, if you always use fdopen() with correct arguments and if, in case of a NULL return of this function, the code does not look at errno, then the '#undef fdopen' is OK. (On those platforms where the Microsoft deprecated alias still work, or when it is overridden by a redirect to some perl internal function.) Bruno [1] https://www.gnu.org/software/gnulib/manual/html_node/fdopen.html