Revision: 77939
          http://sourceforge.net/p/brlcad/code/77939
Author:   starseeker
Date:     2020-12-07 15:26:26 +0000 (Mon, 07 Dec 2020)
Log Message:
-----------
This flag was introduced recently, and we may still see older GCCs on some 
platforms.

Modified Paths:
--------------
    brlcad/trunk/src/libbg/spsr/MarchingCubes.cpp

Modified: brlcad/trunk/src/libbg/spsr/MarchingCubes.cpp
===================================================================
--- brlcad/trunk/src/libbg/spsr/MarchingCubes.cpp       2020-12-07 03:54:10 UTC 
(rev 77938)
+++ brlcad/trunk/src/libbg/spsr/MarchingCubes.cpp       2020-12-07 15:26:26 UTC 
(rev 77939)
@@ -35,7 +35,9 @@
 #endif
 #if defined(__GNUC__) && !defined(__clang__)
 #  pragma GCC diagnostic ignored "-Wfloat-equal"
-#  pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
+#  if __GNUC_PREREQ(7,0)
+#    pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
+#  endif
 #endif
 #if defined(__clang__)
 #  pragma clang diagnostic ignored "-Wfloat-equal"

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