build: warn on implicit fallthrough for case statements

diff --git a/configure.ac b/configure.ac
index ef4ad69c4ed271ee997d66411c4bb6aa6c99aa64..3d86fe2ec346627f96afe9df4cad003d08f69137 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -76,6 +76,7 @@ AX_CFLAGS_GCC_OPTION([-W], [LLDP_CFLAGS])
 AX_CFLAGS_GCC_OPTION([-Wextra], [LLDP_CFLAGS])
 AX_CFLAGS_GCC_OPTION([-Wformat], [LLDP_CFLAGS])
 AX_CFLAGS_GCC_OPTION([-Wformat-security], [LLDP_CFLAGS])
+AX_CFLAGS_GCC_OPTION([-Wimplicit-fallthrough], [LLDP_CFLAGS])
 AX_CFLAGS_GCC_OPTION([-Wfatal-errors], [LLDP_CFLAGS])
 AX_CFLAGS_GCC_OPTION([-Wcast-align], [LLDP_CFLAGS])
 AX_CFLAGS_GCC_OPTION([-Wheader-guard], [LLDP_CFLAGS])