Partial fix for #11378: No implicit int in C++ mode (#4696)

Author: chrchr-github

lib/tokenlist.cpp

@@ -1957,11 +1957,25 @@ void TokenList::simplifyPlatformTypes()
 
 void TokenList::simplifyStdType()
 {
+    auto isVarDeclC = [](const Token* tok) -> bool {
+        if (!Token::simpleMatch(tok, "}"))
+            return false;
+        tok = tok->link()->previous();
+        while (Token::Match(tok, "%name%")) {
+            if (Token::Match(tok, "struct|union|enum"))
+                return true;
+            tok = tok->previous();
+        }
+        return false;
+    };
+
     for (Token *tok = front(); tok; tok = tok->next()) {
 
-        if (Token::Match(tok, "const|extern *|&|%name%") && (!tok->previous() || Token::Match(tok->previous(), "[;{}]"))) {
+        if (isC() && Token::Match(tok, "const|extern *|&|%name%") && (!tok->previous() || Token::Match(tok->previous(), "[;{}]"))) {
             if (Token::Match(tok->next(), "%name% !!;"))
                 continue;
+            if (isVarDeclC(tok->previous()))
+                continue;
 
             tok->insertToken("int");
             tok->next()->isImplicitInt(true);

test/testtokenize.cpp

@@ -223,6 +223,7 @@ class TestTokenizer : public TestFixture {
         TEST_CASE(vardecl27);  // #7850 - crash on valid C code
         TEST_CASE(vardecl28);
         TEST_CASE(vardecl29); // #9282
+        TEST_CASE(vardecl30);
         TEST_CASE(vardecl_stl_1);
         TEST_CASE(vardecl_stl_2);
         TEST_CASE(vardecl_stl_3);
@@ -2518,6 +2519,14 @@ class TestTokenizer : public TestFixture {
                       tokenizeAndStringify(code));
     }
 
+    void vardecl30() {
+        const char code[] = "struct D {} const d;";
+        ASSERT_EQUALS("struct D { } ; struct D const d ;",
+                      tokenizeAndStringify(code, true, Settings::Native, "test.cpp"));
+        ASSERT_EQUALS("struct D { } ; struct D const d ;",
+                      tokenizeAndStringify(code, true, Settings::Native, "test.c"));
+    }
+
     void volatile_variables() {
         {
             const char code[] = "volatile int a=0;\n"
@@ -2578,15 +2587,15 @@ class TestTokenizer : public TestFixture {
     }
 
     void implicitIntConst() {
-        ASSERT_EQUALS("const int x ;", tokenizeAndStringify("const x;"));
-        ASSERT_EQUALS("const int * x ;", tokenizeAndStringify("const *x;"));
-        ASSERT_EQUALS("const int * f ( ) ;", tokenizeAndStringify("const *f();"));
+        ASSERT_EQUALS("const int x ;", tokenizeAndStringify("const x;", true, Settings::Native, "test.c"));
+        ASSERT_EQUALS("const int * x ;", tokenizeAndStringify("const *x;", true, Settings::Native, "test.c"));
+        ASSERT_EQUALS("const int * f ( ) ;", tokenizeAndStringify("const *f();", true, Settings::Native, "test.c"));
     }
 
     void implicitIntExtern() {
-        ASSERT_EQUALS("extern int x ;", tokenizeAndStringify("extern x;"));
-        ASSERT_EQUALS("extern int * x ;", tokenizeAndStringify("extern *x;"));
-        ASSERT_EQUALS("const int * f ( ) ;", tokenizeAndStringify("const *f();"));
+        ASSERT_EQUALS("extern int x ;", tokenizeAndStringify("extern x;", true, Settings::Native, "test.c"));
+        ASSERT_EQUALS("extern int * x ;", tokenizeAndStringify("extern *x;", true, Settings::Native, "test.c"));
+        ASSERT_EQUALS("const int * f ( ) ;", tokenizeAndStringify("const *f();", true, Settings::Native, "test.c"));
     }
 
     /**