[committed] libstdc++: Fix warning during configure

[Jonathan Wakely]

Tested x86_64-linux. Pushed to trunk.

-- >8 --

The checks for snprintf give a -Wformat warning due to a missing
argument.

libstdc++-v3/ChangeLog:

        * acinclude.m4 (GLIBCXX_ENABLE_C99): Fix snprintf checks.
        * configure: Regenerate.
---
 libstdc++-v3/acinclude.m4 | 4 ++--
 libstdc++-v3/configure    | 8 ++++----
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index d8f0ba1c3e2..654b99e92d7 100644
--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -997,7 +997,7 @@ AC_DEFUN([GLIBCXX_ENABLE_C99], [
            vscanf("%i", args);
            vsnprintf(fmt, 0, "%i", args);
            vsscanf(fmt, "%i", args);
-           snprintf(fmt, 0, "%i");
+           snprintf(fmt, 0, "%i", 1);
          }], [],
         [glibcxx_cv_c99_stdio_cxx98=yes], [glibcxx_cv_c99_stdio_cxx98=no])
     ])
@@ -1578,7 +1578,7 @@ AC_DEFUN([GLIBCXX_ENABLE_C99], [
            vscanf("%i", args);
            vsnprintf(fmt, 0, "%i", args);
            vsscanf(fmt, "%i", args);
-           snprintf(fmt, 0, "%i");
+           snprintf(fmt, 0, "%i", 1);
          }], [],
         [glibcxx_cv_c99_stdio_cxx11=yes], [glibcxx_cv_c99_stdio_cxx11=no])
     ])