cmake: disable fallthrough warnings for PCRE

ethomson · ethomson · commit 1f9b72225d8e · 2019-05-22T12:47:04.000+02:00
Our PCRE dependency has uncommented fallthroughs in switch statements.
Turn off warnings for those in the PCRE code.
diff --git a/deps/pcre/CMakeLists.txt b/deps/pcre/CMakeLists.txt
@@ -21,6 +21,7 @@ CHECK_TYPE_SIZE("long long"             LONG_LONG)
 CHECK_TYPE_SIZE("unsigned long long"    UNSIGNED_LONG_LONG)
 
 DISABLE_WARNINGS(unused-function)
+DISABLE_WARNINGS(implicit-fallthrough)
 
 # User-configurable options
 
