tests: add memory leak test

Also ...

tcctest.c:
- exclude stuff that gcc doesn't compile on windows.

libtcc.c/tccpp.c:
- use unsigned for memory sizes to avoid printf format warnings
- use "file:line: message" to make IDE error parsers happy.

tccgen.c: fix typo

tests/tcctest.c

@@ -3122,6 +3122,7 @@ void other_constraints_test(void)
     int var;
     __asm__ volatile ("mov %P1,%0" : "=r" (ret) : "p" (&var));
     printf ("oc1: %d\n", ret == (unsigned long)&var);
+}
 
 #ifndef _WIN32
 /* Test global asm blocks playing with aliases.  */
@@ -3161,6 +3162,7 @@ char * get_asm_string (void)
 		"2:\t.long 1b - 2b, %c0 - 2b\n"
 		".popsection\n" : : "i" ("A string"));
   char * str = ((char*)bug_table) + bug_table[1];
+  return str;
 }
 #endif
 
@@ -3301,12 +3303,15 @@ void asm_test(void)
  label2:
     __asm__("btsl %1,%0" : "=m"(set) : "Ir"(20) : "cc");
     printf("set=0x%x\n", set);
+    val = 0x01020304;
     printf("swab32(0x%08x) = 0x%0x\n", val, swab32(val));
 #ifndef _WIN32
     override_func1();
     override_func2();
     /* The base_func ref from the following inline asm should find
        the global one, not the local decl from this function.  */
+    asm volatile(".weak override_func3\n.set override_func3, base_func");
+    override_func3();
     printf("asmstr: %s\n", get_asm_string());
 #endif
     /* Check that we can also load structs of appropriate layout
@@ -3319,7 +3324,6 @@ void asm_test(void)
        8 bit.  */
     asm volatile("cmp %1,%2; sete %0" : "=a"(somebool) : "r"(1), "r"(2));
     if (!somebool)
-      printf("asmbool: failed\n");
       printf("asmbool: failed\n");
 #endif
     val = 43;
@@ -3677,10 +3681,12 @@ typedef struct gate_struct64 gate_desc;
 } __attribute__((packed));
 typedef struct gate_struct64 gate_desc;
 gate_desc a_gate_desc;
+void attrib_test(void)
 {
 #ifndef _WIN32
   printf("attr: %d %d %d %d\n", sizeof(struct Spacked),
 	 sizeof(spacked), sizeof(Spacked2), sizeof(spacked2));
+  printf("attr: %d %d\n", sizeof(Spacked3), sizeof(spacked3));
   printf("attr: %d %d\n", sizeof(gate_desc), sizeof(a_gate_desc));
 #endif
 }