Enable -Wimplicit-fallthrough if supported

Suggested by djm.

diff --git a/configure.ac b/configure.ac
index cc944174b520db5f0e7db31ca28549fb56d91691..1749b2903c67e027d88afc9084df31d5ae5237b6 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -164,6 +164,7 @@ if test "$GCC" = "yes" || test "$GCC" = "egcs"; then
        OSSH_CHECK_CFLAG_COMPILE([-Wsizeof-pointer-memaccess])
        OSSH_CHECK_CFLAG_COMPILE([-Wpointer-sign], [-Wno-pointer-sign])
        OSSH_CHECK_CFLAG_COMPILE([-Wunused-result], [-Wno-unused-result])
+       OSSH_CHECK_CFLAG_COMPILE([-Wimplicit-fallthrough])
        OSSH_CHECK_CFLAG_COMPILE([-fno-strict-aliasing])
     if test "x$use_toolchain_hardening" = "x1"; then
        OSSH_CHECK_CFLAG_COMPILE([-mretpoline]) # clang