Tests for declarations of snprintf/vsnprintf/vsscanf should be done in C++.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@53035 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

configure

@@ -35017,6 +35017,12 @@ fi
 done
 
 
+    ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+
 if test "$ac_cv_func_vsnprintf" = "yes"; then
         { echo "$as_me:$LINENO: checking for vsnprintf declaration" >&5
 echo $ECHO_N "checking for vsnprintf declaration... $ECHO_C" >&6; }
@@ -35401,6 +35407,12 @@ _ACEOF
 
     fi
 fi
+    ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
 
 if test "$wxUSE_UNICODE" = yes; then
 

configure.in

@@ -4029,6 +4029,7 @@ dnl
 dnl FIXME: replace this mess with WX_CHECK_FUNCS()
 AC_CHECK_FUNCS(snprintf vsnprintf vsscanf)
 
+AC_LANG_PUSH(C++)
 if test "$ac_cv_func_vsnprintf" = "yes"; then
     dnl yes it is -- now check if it is in the headers
     AC_CACHE_CHECK([for vsnprintf declaration], wx_cv_func_vsnprintf_decl,
@@ -4194,6 +4195,7 @@ if test "$ac_cv_func_vsscanf" = "yes"; then
         AC_DEFINE(HAVE_VSSCANF_DECL)
     fi
 fi
+AC_LANG_POP()
 
 if test "$wxUSE_UNICODE" = yes; then