[Mingw-users] gcc 8.2.0: missing _fileno() for c++11anton****@gmail*****
Wed Jan 22 06:46:41 JST 2020
Keith Marshall to Anton Shepelev: > > Have you an idea why, then, fileno() is not rejected on > > Linux with -std=c++11? > > One can only speculate that GLIBC headers are less > rigorous in their interpretation of STRICT_ANSI__; > opinions may differ on this, but in mine, that's a defect > in GLIBC. You are right. A maintainer of GCC has confirmed his intention actually to disable the automatic activation of _GNU_SOURCE for all the -std options, which will make their build of GCC behave like yours already does! > _fileno() is not implemented as a function, in Microsoft's > C-runtime library; it is defined as a macro in <stdio.h>, > (or <cstdio> for use in C++ code). The following works > (tested on Manjaro-Linux, with my own self-built MinGW > cross-compiler, and run under Wine): > [...] Thank you very much for the work-around. I have forwarded it to the maintainers. Now they have have to solutions to choose from. > #define _fileno(__F) ((__F)->_file) So FILE is not a truly opaque type in MinGW -- interesting.
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