misra.py: Fix false positives on macro expansion

This will fix Trac#9634

addons/misra.py

@@ -2322,7 +2322,9 @@ class MisraChecker:
 
                     while pos1 >= 0 and exp[pos1] == ' ':
                         pos1 -= 1
-                    if exp[pos1] not in '([#,.':
+                    if exp[pos1] == '#':
+                        continue
+                    if exp[pos1] not in '([,.':
                         self.reportError(directive, 20, 7)
                         break
                     while pos2 < len(exp) and exp[pos2] == ' ':

addons/test/misra/misra-test.c

@@ -1027,6 +1027,10 @@ union misra_19_2 { }; // 19.2
 #define M_20_7_3(A)  ((A)+A) // 20.7
 #define M_20_7_4(A)  x##A // 20.10 this test was written to see there are not FPs
 #define M_20_7_5(A,B)  f(A, B) // no warning
+#define M_20_7_6(x) a ## x = ( x ) // 20.10
+#define M_20_7_7(x) a  = # x // 20.10
+#define M_20_7_8(x, fn) a = fn ( # x ) // 20.7 20.10
+#define M_20_7_9(x, fn) a = (fn) ( # x ) // 20.10
 
 // Compliant: M is a structure member name, not an expression
 struct { int a; } struct_20_7_s;