Enable -Wcovered-switch-default again, but add -Werror to the checks to make
sure we don't use it with compilers that don't support it.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151665 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/projects/sample/autoconf/configure.ac b/projects/sample/autoconf/configure.ac
index 1caff51..a1110ec 100644
--- a/projects/sample/autoconf/configure.ac
+++ b/projects/sample/autoconf/configure.ac
@@ -1019,7 +1019,8 @@
AC_MSG_CHECKING([optional compiler flags])
CXX_FLAG_CHECK(NO_VARIADIC_MACROS, [-Wno-variadic-macros])
CXX_FLAG_CHECK(NO_MISSING_FIELD_INITIALIZERS, [-Wno-missing-field-initializers])
-AC_MSG_RESULT([$NO_VARIADIC_MACROS $NO_MISSING_FIELD_INITIALIZERS])
+CXX_FLAG_CHECK(COVERED_SWITCH_DEFAULT, [-Wcovered-switch-default])
+AC_MSG_RESULT([$NO_VARIADIC_MACROS $NO_MISSING_FIELD_INITIALIZERS $COVERED_SWITCH_DEFAULT])
dnl===-----------------------------------------------------------------------===
dnl===
diff --git a/projects/sample/autoconf/m4/cxx_flag_check.m4 b/projects/sample/autoconf/m4/cxx_flag_check.m4
index ab09f2a..62454b7 100644
--- a/projects/sample/autoconf/m4/cxx_flag_check.m4
+++ b/projects/sample/autoconf/m4/cxx_flag_check.m4
@@ -1,2 +1,2 @@
AC_DEFUN([CXX_FLAG_CHECK],
- [AC_SUBST($1, `$CXX $2 -fsyntax-only -xc /dev/null 2>/dev/null && echo $2`)])
+ [AC_SUBST($1, `$CXX -Werror $2 -fsyntax-only -xc /dev/null 2>/dev/null && echo $2`)])