COMP: add -fpermissive to c++LESSWARN flags (closes #744)

- downgrades some diagnostics about nonconformant code from errors to
  warnings. Oddly enough, the errors actually arise from STL library
  elements shipped with gcc itself. Affects kahip compilation with
  gcc-6, gcc-7

wmake/rules/linux64Gcc/c++

@@ -3,8 +3,10 @@ SUFFIXES += .C .cc .cpp .cxx
 c++WARN     = -Wall -Wextra -Wold-style-cast -Wnon-virtual-dtor -Wno-unused-parameter \
               -Wno-invalid-offsetof -Wno-attributes
 
-# Suppress some warnings for flex++ and CGAL
-c++LESSWARN = -Wno-old-style-cast -Wno-unused-local-typedefs -Wno-array-bounds
+# Suppress some warnings (flex++, CGAL, etc)
+c++LESSWARN = \
+    -Wno-old-style-cast -Wno-unused-local-typedefs -Wno-array-bounds \
+    -fpermissive
 
 CC          = g++ -std=c++11 -m64
 

wmake/rules/linux64GccKNL/c++

@@ -3,8 +3,10 @@ SUFFIXES += .C .cc .cpp .cxx
 c++WARN     = -Wall -Wextra -Wold-style-cast -Wnon-virtual-dtor -Wno-unused-parameter \
               -Wno-invalid-offsetof -Wno-attributes
 
-# Suppress some warnings for flex++ and CGAL
-c++LESSWARN = -Wno-old-style-cast -Wno-unused-local-typedefs -Wno-array-bounds
+# Suppress some warnings (flex++, CGAL, etc)
+c++LESSWARN = \
+    -Wno-old-style-cast -Wno-unused-local-typedefs -Wno-array-bounds \
+    -fpermissive
 
 CC          = g++ -std=c++11 -m64 -march=knl
 

wmake/rules/linuxARM64Gcc/c++

@@ -3,8 +3,10 @@ SUFFIXES += .C .cc .cpp .cxx
 c++WARN     = -Wall -Wextra -Wold-style-cast -Wnon-virtual-dtor -Wno-unused-parameter \
               -Wno-invalid-offsetof -Wno-attributes
 
-# Suppress some warnings for flex++ and CGAL
-c++LESSWARN = -Wno-old-style-cast -Wno-unused-local-typedefs -Wno-array-bounds
+# Suppress some warnings (flex++, CGAL, etc)
+c++LESSWARN = \
+    -Wno-old-style-cast -Wno-unused-local-typedefs -Wno-array-bounds \
+    -fpermissive
 
 CC          = g++ -std=c++11
 

wmake/rules/linuxARM7Gcc/c++

@@ -3,8 +3,10 @@ SUFFIXES += .C .cc .cpp .cxx
 c++WARN     = -Wall -Wextra -Wold-style-cast -Wnon-virtual-dtor -Wno-unused-parameter \
               -Wno-invalid-offsetof -Wno-attributes
 
-# Suppress some warnings for flex++ and CGAL
-c++LESSWARN = -Wno-old-style-cast -Wno-unused-local-typedefs -Wno-array-bounds
+# Suppress some warnings (flex++, CGAL, etc)
+c++LESSWARN = \
+    -Wno-old-style-cast -Wno-unused-local-typedefs -Wno-array-bounds \
+    -fpermissive
 
 CC          = g++ -std=c++11
 

wmake/rules/linuxGcc/c++

@@ -3,8 +3,10 @@ SUFFIXES += .C .cc .cpp .cxx
 c++WARN     = -Wall -Wextra -Wold-style-cast -Wnon-virtual-dtor -Wno-unused-parameter \
               -Wno-invalid-offsetof -Wno-attributes
 
-# Suppress some warnings for flex++ and CGAL
-c++LESSWARN = -Wno-old-style-cast -Wno-unused-local-typedefs -Wno-array-bounds
+# Suppress some warnings (flex++, CGAL, etc)
+c++LESSWARN = \
+    -Wno-old-style-cast -Wno-unused-local-typedefs -Wno-array-bounds \
+    -fpermissive
 
 CC          = g++ -std=c++11 -m32
 

wmake/rules/linuxIA64Gcc/c++

@@ -3,8 +3,10 @@ SUFFIXES += .C .cc .cpp .cxx
 c++WARN     = -Wall -Wextra -Wold-style-cast -Wnon-virtual-dtor -Wno-unused-parameter \
               -Wno-invalid-offsetof -Wno-attributes
 
-# Suppress some warnings for flex++ and CGAL
-c++LESSWARN = -Wno-old-style-cast -Wno-unused-local-typedefs -Wno-array-bounds
+# Suppress some warnings (flex++, CGAL, etc)
+c++LESSWARN = \
+    -Wno-old-style-cast -Wno-unused-local-typedefs -Wno-array-bounds \
+    -fpermissive
 
 CC          = g++ -std=c++11
 

wmake/rules/linuxPPC64Gcc/c++

@@ -3,8 +3,10 @@ SUFFIXES += .C .cc .cpp .cxx
 c++WARN     = -Wall -Wextra -Wold-style-cast -Wnon-virtual-dtor -Wno-unused-parameter \
               -Wno-invalid-offsetof -Wno-attributes
 
-# Suppress some warnings for flex++ and CGAL
-c++LESSWARN = -Wno-old-style-cast -Wno-unused-local-typedefs -Wno-array-bounds
+# Suppress some warnings (flex++, CGAL, etc)
+c++LESSWARN = \
+    -Wno-old-style-cast -Wno-unused-local-typedefs -Wno-array-bounds \
+    -fpermissive
 
 CC          = g++ -std=c++11 -m64 -mcpu=power5+
 

wmake/rules/linuxPPC64leGcc/c++

@@ -3,8 +3,10 @@ SUFFIXES += .C .cc .cpp .cxx
 c++WARN     = -Wall -Wextra -Wold-style-cast -Wnon-virtual-dtor -Wno-unused-parameter \
               -Wno-invalid-offsetof -Wno-attributes
 
-# Suppress some warnings for flex++ and CGAL
-c++LESSWARN = -Wno-old-style-cast -Wno-unused-local-typedefs -Wno-array-bounds
+# Suppress some warnings (flex++, CGAL, etc)
+c++LESSWARN = \
+    -Wno-old-style-cast -Wno-unused-local-typedefs -Wno-array-bounds \
+    -fpermissive
 
 CC          = g++ -std=c++11 -m64 -mcpu=power8
 

wmake/rules/solaris64Gcc/c++

@@ -3,7 +3,7 @@ SUFFIXES += .C .cc .cpp .cxx
 c++WARN     = -Wall -Wextra -Wold-style-cast -Wnon-virtual-dtor -Wno-unused-parameter \
               -Wno-invalid-offsetof -Wno-attributes
 
-# Suppress some warnings for flex++ and CGAL
+# Suppress some warnings (flex++, CGAL, etc)
 c++LESSWARN =
 
 CC          = g++ -std=c++11 -m64

wmake/rules/solarisGcc/c++

@@ -3,7 +3,7 @@ SUFFIXES += .C .cc .cpp .cxx
 c++WARN     = -Wall -Wextra -Wold-style-cast -Wnon-virtual-dtor -Wno-unused-parameter \
               -Wno-invalid-offsetof -Wno-attributes
 
-# Suppress some warnings for flex++ and CGAL
+# Suppress some warnings (flex++, CGAL, etc)
 c++LESSWARN =
 
 CC          = g++ -std=c++11