FilePeeker: Suppress gcc8 warnings from boost.

Suppress a gcc8 warning from boost (in mpl/assert.h).
(Binaries apparently include boost with -I rather than -isystem.)
Fixed in boost 1.68 (see https://github.com/boostorg/mpl/issues/31)



Former-commit-id: c3a420b2

Tools/FilePeeker/src/BSFilePeeker.cxx

@@ -6,7 +6,17 @@
 #include <iostream>
 #include <string>
 #include <unistd.h>
+// Suppress a gcc8 warning from boost.
+// (Binaries apparently include boost with -I rather than -isystem.)
+// Fixed in boost 1.68 (see https://github.com/boostorg/mpl/issues/31)
+#ifdef __GNUC__
+# pragma GCC diagnostic push
+# pragma GCC diagnostic ignored "-Wparentheses"
+#endif
 #include "EventStorage/pickDataReader.h"
+#ifdef __GNUC__
+# pragma GCC diagnostic pop
+#endif
 #include "FileMetaData.h"
 
 class BSFilePeeker {