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%z for printf on mingw

From: Reuben Thomas
Subject: %z for printf on mingw
Date: Sun, 22 Nov 2020 22:40:34 +0000

gnulib can #define __USE_MINGW_ANSI_STDIO so that %z is implemented, but warnings are still generated for xasprintf (not for printf).

As far as I can tell, this is because the _GL_ATTRIBUTE_FORMAT_PRINTF_SYSTEM machinery to choose the correct attribute (__gnu_printf__ or __printf__) for printf-like functions needs to be used in xvasprintf.h and hence vasnprintf.h as well as in stdio.h.

I guess this applies to all printf-like functions in gnulib that ultimately use the system printf, that is, in verror.h, xprintf.h and argp.h (which depend on xvasprintf or stdio).


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