[Bug runtime/25267] kernel 5.3: error: this statement may fall through [-Werror=implicit-fallthrough=]

["craig.ringer at 2ndquadrant dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=25267

--- Comment #2 from Craig Ringer <craig.ringer at 2ndquadrant dot com> ---
Correction, workaround is

```
commit 495ed9143004e62284f959f0a7630bdf229c6e62 (HEAD -> master)
Author: Craig Ringer <craig@2ndquadrant.com>
Date:   Tue Dec 10 15:24:15 2019 +0800

    Work around bug #25267 on Linux 5.3

diff --git a/buildrun.cxx b/buildrun.cxx
index 505902bc5..5f9a7208a 100644
--- a/buildrun.cxx
+++ b/buildrun.cxx
@@ -235,6 +235,7 @@ compile_dyninst (systemtap_session& s)
       "gcc", "--std=gnu99", s.translated_source, "-o", module,
       "-fvisibility=hidden", "-O2", "-I" + s.runtime_path, "-D__DYNINST__",
       "-Wall", WERROR, "-Wno-unused", "-Wno-strict-aliasing",
+      "-Wno-error=implicit-fallthrough",
       "-pthread", "-lrt", "-fPIC", "-shared",
     };

@@ -539,6 +540,7 @@ compile_pass (systemtap_session& s)

   // Assumes linux 2.6 kbuild
   o << "EXTRA_CFLAGS += -Wno-unused $(call
cc-option,-Wno-tautological-compare) " << WERROR
+    << "-Wno-error=implicit-fallthrough "
     << endl;
   #if CHECK_POINTER_ARITH_PR5947
   o << "EXTRA_CFLAGS += -Wpointer-arith" << endl;
```

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