endif
# Extra flags to pass to GCC.
-+gccwarn := -Wall -Wwrite-strings -Wundef
++gccwarn := -Wall -Wwrite-strings -Wundef $(cc-option-wimplicit-fallthrough)
ifeq ($(enable-werror),yes)
+gccwarn += -Werror
endif
fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for -Wimplicit-fallthrough" >&5
+printf %s "checking for -Wimplicit-fallthrough... " >&6; }
+if test ${libc_cv_cc_wimplicit_fallthrough+y}
+then :
+ printf %s "(cached) " >&6
+else case e in #(
+ e) if { ac_try='${CC-cc} -Werror -Wimplicit-fallthrough -xc /dev/null -S -o /dev/null'
+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+ test $ac_status = 0; }; }
+then :
+ libc_cv_cc_wimplicit_fallthrough=-Wimplicit-fallthrough
+else case e in #(
+ e) libc_cv_cc_wimplicit_fallthrough= ;;
+esac
+fi
+ ;;
+esac
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_cc_wimplicit_fallthrough" >&5
+printf "%s\n" "$libc_cv_cc_wimplicit_fallthrough" >&6; }
+config_vars="$config_vars
+cc-option-wimplicit-fallthrough = $libc_cv_cc_wimplicit_fallthrough"
+
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for libgd" >&5
printf %s "checking for libgd... " >&6; }
if test "$with_gd" != "no"; then
fi
AC_SUBST(libc_cv_cc_loop_to_function)
+AC_CACHE_CHECK([for -Wimplicit-fallthrough],
+ libc_cv_cc_wimplicit_fallthrough, [dnl
+LIBC_TRY_CC_OPTION([-Werror -Wimplicit-fallthrough],
+ [libc_cv_cc_wimplicit_fallthrough=-Wimplicit-fallthrough],
+ [libc_cv_cc_wimplicit_fallthrough=])
+])
+LIBC_CONFIG_VAR([cc-option-wimplicit-fallthrough],
+ [$libc_cv_cc_wimplicit_fallthrough])
+
dnl Check whether we have the gd library available.
AC_MSG_CHECKING(for libgd)
if test "$with_gd" != "no"; then