make the std::map dumper work with keys that already have a const

qualification like 'const char *'

bin/gdbmacros/gdbmacros.cpp

@@ -2155,6 +2155,14 @@ static void qDumpStdMap(QDumper &d)
     P(d, "valuedisabled", "true");
     P(d, "valueoffset", d.extraInt[2]);
 
+    // HACK: we need a properly const qualified version of the
+    // std::pair used. We extract it from the allocator parameter
+    // as it is there, and, equally importantly, in an order that
+    // gdb accepts when fed with it.
+    char *pairType = (char *)(d.templateParameters[3]) + 16;
+    pairType[strlen(pairType) - 2] = 0;
+    P(d, "pairtype", pairType);
+    
     if (d.dumpChildren) {
         bool simpleKey = isSimpleType(keyType);
         bool simpleValue = isShortKey(valueType);
@@ -2177,7 +2185,7 @@ static void qDumpStdMap(QDumper &d)
                 d.beginHash();
                 P(d, "name", "[" << i << "]");
                 P(d, "addr", it.operator->());
-                P(d, "type", "std::pair<const " << keyType << "," << valueType << " >");
+                P(d, "type", pairType);
                 d.endHash();
             }
         }

src/plugins/debugger/gdbengine.cpp

@@ -3022,8 +3022,13 @@ void GdbEngine::runCustomDumper(const WatchData & data0, bool dumpChildren)
     } else if (outertype == "std::map") {
         // We don't want the comparator and the allocator confuse gdb.
         // But we need the offset of the second item in the value pair.
-        extraArgs[2] = "(size_t)&(('std::pair<const " + inners.at(0)
-            + "," + inners.at(1) + ">'*)0)->second";
+        // We read the type of the pair from the allocator argument because
+        // that gets the constness "right" (in the sense that gdb can
+        // read it back;
+        QString pairType = inners.at(3);
+        // remove 'std::allocator<...>':
+        pairType = pairType.mid(15, pairType.size() - 15 - 2);
+        extraArgs[2] = "(size_t)&(('" + pairType + "'*)0)->second";
         extraArgs[3] = "0";
     } else if (outertype == "std::basic_string") {
         //qDebug() << "EXTRACT TEMPLATE: " << outertype << inners;

tests/manual/gdbdebugger/simple/app.cpp

@@ -416,6 +416,11 @@ void testStdMap()
     gg3["33.0"] = Foo(33);
     gg3["44.0"] = Foo(44);
 
+
+    std::map<const char *, Foo> m1;
+    m1["22.0"] = Foo(22);
+    m1["33.0"] = Foo(33);
+    m1["44.0"] = Foo(44);
 #if 1
     std::map<uint, uint> gg;
     gg[11] = 1;