vasprintf-gnu: New module.

* m4/vasprintf-posix.m4 (gl_FUNC_VASPRINTF_IS_POSIX): New macro,
extracted from gl_FUNC_VASPRINTF_POSIX.
(gl_FUNC_VASPRINTF_POSIX): Require it. Invoke
gl_PREREQ_VASNPRINTF_WITH_POSIX_EXTRAS.
* m4/vasprintf-gnu.m4: New file, based on m4/vasprintf-posix.m4.
* modules/vasprintf-gnu: New file, based on modules/vasnprintf-gnu.
* doc/glibc-functions/vasprintf.texi: Mention the new module.
* doc/glibc-functions/asprintf.texi: Likewise.

2 files changed, 20 insertions, 6 deletions

diff --git a/doc/glibc-functions/asprintf.texi b/doc/glibc-functions/asprintf.texi
index 70de08dd1c..017220f66f 100644
--- a/doc/glibc-functions/asprintf.texi
+++ b/doc/glibc-functions/asprintf.texi
@@ -17,16 +17,16 @@ Documentation:
 @uref{https://www.kernel.org/doc/man-pages/online/pages/man3/asprintf.3.html,,man asprintf}.
 @end itemize
 
-Gnulib module: vasprintf or vasprintf-posix
+Gnulib module: vasprintf or vasprintf-posix or vasprintf-gnu
 
-Portability problems fixed by either Gnulib module @code{vasprintf} or @code{vasprintf-posix}:
+Portability problems fixed by either Gnulib module @code{vasprintf} or @code{vasprintf-posix} or @code{vasprintf-gnu}:
 @itemize
 @item
 This function is missing on some platforms:
 AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 10, mingw, MSVC 14.
 @end itemize
 
-Portability problems fixed by Gnulib module @code{vasprintf-posix}:
+Portability problems fixed by either Gnulib module @code{vasprintf-posix} or @code{vasprintf-gnu}:
 @itemize
 @item
 This function does not support size specifiers as in C99 (@code{hh}, @code{ll},
@@ -79,6 +79,13 @@ This function can crash in out-of-memory conditions on some platforms:
 FreeBSD 13.0, NetBSD 5.0.
 @end itemize
 
+Portability problems fixed by Gnulib module @code{vasprintf-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/vasprintf.texi b/doc/glibc-functions/vasprintf.texi
index ef1be6bb88..91cf7d5635 100644
--- a/doc/glibc-functions/vasprintf.texi
+++ b/doc/glibc-functions/vasprintf.texi
@@ -17,16 +17,16 @@ Documentation:
 @uref{https://www.kernel.org/doc/man-pages/online/pages/man3/vasprintf.3.html,,man vasprintf}.
 @end itemize
 
-Gnulib module: vasprintf or vasprintf-posix
+Gnulib module: vasprintf or vasprintf-posix or vasprintf-gnu
 
-Portability problems fixed by either Gnulib module @code{vasprintf} or @code{vasprintf-posix}:
+Portability problems fixed by either Gnulib module @code{vasprintf} or @code{vasprintf-posix} or @code{vasprintf-gnu}:
 @itemize
 @item
 This function is missing on some platforms:
 AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 10, mingw, MSVC 14.
 @end itemize
 
-Portability problems fixed by Gnulib module @code{vasprintf-posix}:
+Portability problems fixed by either Gnulib module @code{vasprintf-posix} or @code{vasprintf-gnu}:
 @itemize
 @item
 This function does not support size specifiers as in C99 (@code{hh}, @code{ll},
@@ -79,6 +79,13 @@ This function can crash in out-of-memory conditions on some platforms:
 FreeBSD 13.0, NetBSD 5.0.
 @end itemize
 
+Portability problems fixed by Gnulib module @code{vasprintf-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