clang-10: ignore fallthrough warning in generated code

[openafs.git] / src / cf / osconf.m4

diff --git a/src/cf/osconf.m4 b/src/cf/osconf.m4
index e5e484a..53ded31 100644 (file)
--- a/src/cf/osconf.m4
+++ b/src/cf/osconf.m4
@@ -622,6 +622,7 @@ CFLAGS_NOERROR=
 CFLAGS_NOSTRICT=-fno-strict-aliasing
 CFLAGS_NOUNUSED=
 CFLAGS_NOOLDSTYLE=
+CFLAGS_NOIMPLICIT_FALLTHROUGH=
 XCFLAGS_NOCHECKING="$XCFLAGS"
 
 if test "x$GCC" = "xyes"; then
@@ -629,12 +630,14 @@ if test "x$GCC" = "xyes"; then
     XCFLAGS="${XCFLAGS} -Wall -Wstrict-prototypes -Wold-style-definition -Wpointer-arith"
   fi
   if test "x$enable_checking" != "xno"; then
-    XCFLAGS="${XCFLAGS} -Wall -Wstrict-prototypes -Wold-style-definition -Werror -fdiagnostics-show-option -Wpointer-arith"
+    XCFLAGS="${XCFLAGS} -Wall -Wstrict-prototypes -Wold-style-definition -Werror -fdiagnostics-show-option -Wpointer-arith -fno-common"
     CFLAGS_WERROR="-Werror"
     if test "x$enable_checking" != "xall"; then
       CFLAGS_NOERROR="-Wno-error"
       CFLAGS_NOUNUSED="-Wno-unused"
       CFLAGS_NOOLDSTYLE="-Wno-old-style-definition"
+      AX_APPEND_COMPILE_FLAGS([-Wno-implicit-fallthrough],
+                               [CFLAGS_NOIMPLICIT_FALLTHROUGH])
       AC_DEFINE(IGNORE_SOME_GCC_WARNINGS, 1, [define to disable some gcc warnings in warnings-as-errors mode])
     else
       CFLAGS_NOSTRICT=
@@ -658,6 +661,11 @@ else
   esac
 fi
 
+dnl add additional checks if compilers support the flags
+AS_IF([test "x$enable_checking" != "xno"],
+      [AX_APPEND_COMPILE_FLAGS([-Wimplicit-fallthrough], [XCFLAGS])
+])
+
 dnl horribly cheating, assuming double / is ok.
 case $INSTALL in
   ./* ) 
@@ -710,6 +718,7 @@ AC_SUBST(CFLAGS_NOERROR)
 AC_SUBST(CFLAGS_NOSTRICT)
 AC_SUBST(CFLAGS_NOUNUSED)
 AC_SUBST(CFLAGS_NOOLDSTYLE)
+AC_SUBST(CFLAGS_NOIMPLICIT_FALLTHROUGH)
 AC_SUBST(CFLAGS_WERROR)
 AC_SUBST(XCFLAGS64)
 AC_SUBST(XLDFLAGS)