+CLANG_VERSION=none
+
+if test "x$CLANG_CPLUSPLUS" = "xyes" ; then
+ case "$CC" in
+ (c[1-9][0-9]|*/c[1-9][0-9])
+ { echo "$as_me:16835: WARNING: replacing broken compiler alias $CC" >&5
+echo "$as_me: WARNING: replacing broken compiler alias $CC" >&2;}
+ CFLAGS="$CFLAGS -std=`echo "$CC" | sed -e 's%.*/%%'`"
+ CC=clang
+ ;;
+ esac
+
+ echo "$as_me:16842: checking version of $CC" >&5
+echo $ECHO_N "checking version of $CC... $ECHO_C" >&6
+ CLANG_VERSION="`$CC --version 2>/dev/null | sed -e '2,$d' -e 's/^.*(CLANG[^)]*) //' -e 's/^.*(Debian[^)]*) //' -e 's/^[^0-9.]*//' -e 's/[^0-9.].*//'`"
+ test -z "$CLANG_VERSION" && CLANG_VERSION=unknown
+ echo "$as_me:16846: result: $CLANG_VERSION" >&5
+echo "${ECHO_T}$CLANG_VERSION" >&6
+
+ for cf_clang_opt in \
+ -Qunused-arguments \
+ -Wno-error=implicit-function-declaration
+ do
+ echo "$as_me:16853: checking if option $cf_clang_opt works" >&5
+echo $ECHO_N "checking if option $cf_clang_opt works... $ECHO_C" >&6
+ cf_save_CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS $cf_clang_opt"
+ cat >conftest.$ac_ext <<_ACEOF
+#line 16858 "configure"
+#include "confdefs.h"
+
+ #include <stdio.h>
+int
+main (void)
+{
+
+ printf("hello!\n");
+ ;
+ return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (eval echo "$as_me:16872: \"$ac_link\"") >&5
+ (eval $ac_link) 2>&5
+ ac_status=$?
+ echo "$as_me:16875: \$? = $ac_status" >&5
+ (exit $ac_status); } &&
+ { ac_try='test -s conftest$ac_exeext'
+ { (eval echo "$as_me:16878: \"$ac_try\"") >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ echo "$as_me:16881: \$? = $ac_status" >&5
+ (exit $ac_status); }; }; then
+
+ cf_clang_optok=yes
+else
+ echo "$as_me: failed program was:" >&5
+cat conftest.$ac_ext >&5
+
+ cf_clang_optok=no
+fi
+rm -f conftest.$ac_objext conftest$ac_exeext conftest.$ac_ext
+ echo "$as_me:16892: result: $cf_clang_optok" >&5
+echo "${ECHO_T}$cf_clang_optok" >&6
+ CFLAGS="$cf_save_CFLAGS"
+ if test $cf_clang_optok = yes; then
+ test -n "$verbose" && echo " adding option $cf_clang_opt" 1>&6
+
+echo "${as_me:-configure}:16898: testing adding option $cf_clang_opt ..." 1>&5