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

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.

diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index 32638e6..066453e 100644 (file)
--- 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

diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index de6eb1c..ed64b55 100755 (executable)
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -16408,13 +16408,16 @@ fi
       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
-      { $as_echo "$as_me:${as_lineno-$LINENO}: result: stdio" >&5
-$as_echo "stdio" >&6; }
 
       if test "x$enable_cstdio" = "xstdio_pure" ; then
+       { $as_echo "$as_me:${as_lineno-$LINENO}: result: stdio (without POSIX read/write)" >&5
+$as_echo "stdio (without POSIX read/write)" >&6; }
 
 $as_echo "#define _GLIBCXX_USE_STDIO_PURE 1" >>confdefs.h
 
+      else
+       { $as_echo "$as_me:${as_lineno-$LINENO}: result: stdio (with POSIX read/write)" >&5
+$as_echo "stdio (with POSIX read/write)" >&6; }
       fi
       ;;
   esac