[committed] libstdc++: Improve config output for --enable-cstdio [PR104301]

[Jonathan Wakely]

Tested powerpc64le-linux, pushed to trunk.


Currently we just print "checking for underlying I/O to use... stdio"
unconditionally, whether configured to use stdio_pure or stdio_posix. We
should make it clear that the user's configure option chose the right
thing.

libstdc++-v3/ChangeLog:

	PR libstdc++/104301
	* acinclude.m4 (GLIBCXX_ENABLE_CSTDIO): Print different messages
	for stdio_pure and stdio_posix options.
	* configure: Regenerate.
---
 libstdc++-v3/acinclude.m4 | 4 +++-
 libstdc++-v3/configure    | 7 +++++--
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index 32638e6bfc5..066453e2148 100644
--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -2830,11 +2830,13 @@ AC_DEFUN([GLIBCXX_ENABLE_CSTDIO], [
       CSTDIO_H=config/io/c_io_stdio.h
       BASIC_FILE_H=config/io/basic_file_stdio.h
       BASIC_FILE_CC=config/io/basic_file_stdio.cc
-      AC_MSG_RESULT(stdio)
 
       if test "x$enable_cstdio" = "xstdio_pure" ; then
+	AC_MSG_RESULT([stdio (without POSIX read/write)])
 	AC_DEFINE(_GLIBCXX_USE_STDIO_PURE, 1,
 		  [Define to restrict std::__basic_file<> to stdio APIs.])
+      else
+	AC_MSG_RESULT([stdio (with POSIX read/write)])
       fi
       ;;
   esac