obstack-printf-gnu: New module.

* m4/obstack-printf-posix.m4 (gl_FUNC_OBSTACK_PRINTF_IS_POSIX): New
macro, extracted from gl_FUNC_OBSTACK_PRINTF_POSIX.
(gl_FUNC_OBSTACK_PRINTF_POSIX): Require it. Invoke
gl_PREREQ_VASNPRINTF_WITH_POSIX_EXTRAS.
* m4/obstack-printf-gnu.m4: New file, based on
m4/obstack-printf-posix.m4.
* modules/obstack-printf-gnu: New file, based on modules/vasnprintf-gnu.
* doc/glibc-functions/obstack_printf.texi: Mention the new module.
* doc/glibc-functions/obstack_vprintf.texi: Likewise.

2 files changed, 20 insertions, 6 deletions

diff --git a/doc/glibc-functions/obstack_printf.texi b/doc/glibc-functions/obstack_printf.texi
index 8b13e1296e..18d82a903c 100644
--- a/doc/glibc-functions/obstack_printf.texi
+++ b/doc/glibc-functions/obstack_printf.texi
@@ -10,17 +10,17 @@ Documentation:@*
 @url{https://www.gnu.org/software/libc/manual/html_node/Dynamic-Output.html}.
 @end ifnotinfo
 
-Gnulib module: obstack-printf or obstack-printf-posix
+Gnulib module: obstack-printf or obstack-printf-posix or obstack-printf-gnu
 
 Portability problems fixed by either Gnulib module
-@code{obstack-printf} or @code{obstack-printf-posix}:
+@code{obstack-printf} or @code{obstack-printf-posix} or @code{obstack-printf-gnu}:
 @itemize
 @item
 This function is missing on all non-glibc platforms:
 macOS 11.1, FreeBSD 13.0, NetBSD 9.0, OpenBSD 6.7, Minix 3.1.8, AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 11.4, Cygwin 2.9, mingw, MSVC 14, Android 9.0.
 @end itemize
 
-Portability problems fixed by Gnulib module @code{obstack-printf-posix}:
+Portability problems fixed by either Gnulib module @code{obstack-printf-posix} or @code{obstack-printf-gnu}:
 @itemize
 @item
 This function does not support size specifiers as in C99 (@code{hh}, @code{ll},
@@ -88,6 +88,13 @@ This function does not fully support the @samp{n} directive on some platforms:
 HP-UX 11, mingw, MSVC 14.
 @end itemize
 
+Portability problems fixed by Gnulib module @code{obstack-printf-gnu}:
+@itemize
+@item
+This function does not support the @samp{B} directive on some platforms:
+glibc 2.34, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2, macOS 12.5, AIX 7.2, Solaris 11.4, and others.
+@end itemize
+
 Portability problems not fixed by Gnulib:
 @itemize
 @item
diff --git a/doc/glibc-functions/obstack_vprintf.texi b/doc/glibc-functions/obstack_vprintf.texi
index 2ea59ef4fa..6d7ba77b30 100644
--- a/doc/glibc-functions/obstack_vprintf.texi
+++ b/doc/glibc-functions/obstack_vprintf.texi
@@ -10,17 +10,17 @@ Documentation:@*
 @url{https://www.gnu.org/software/libc/manual/html_node/Variable-Arguments-Output.html}.
 @end ifnotinfo
 
-Gnulib module: obstack-printf or obstack-printf-posix
+Gnulib module: obstack-printf or obstack-printf-posix or obstack-printf-gnu
 
 Portability problems fixed by either Gnulib module
-@code{obstack-printf} or @code{obstack-printf-posix}:
+@code{obstack-printf} or @code{obstack-printf-posix} or @code{obstack-printf-gnu}:
 @itemize
 @item
 This function is missing on all non-glibc platforms:
 macOS 11.1, FreeBSD 13.0, NetBSD 9.0, OpenBSD 6.7, Minix 3.1.8, AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 11.4, Cygwin 2.9, mingw, MSVC 14, Android 9.0.
 @end itemize
 
-Portability problems fixed by Gnulib module @code{obstack-printf-posix}:
+Portability problems fixed by either Gnulib module @code{obstack-printf-posix} or @code{obstack-printf-gnu}:
 @itemize
 @item
 This function does not support size specifiers as in C99 (@code{hh}, @code{ll},
@@ -88,6 +88,13 @@ This function does not fully support the @samp{n} directive on some platforms:
 HP-UX 11, mingw, MSVC 14.
 @end itemize
 
+Portability problems fixed by Gnulib module @code{obstack-printf-gnu}:
+@itemize
+@item
+This function does not support the @samp{B} directive on some platforms:
+glibc 2.34, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2, macOS 12.5, AIX 7.2, Solaris 11.4, and others.
+@end itemize
+
 Portability problems not fixed by Gnulib:
 @itemize
 @item