cppcheck.vcxproj: do not use precompiled header for externals sources (#8177)

this fixes the conflict between functions with the same name in Cppcheck
and simplecpp

Author: firewave

lib/cppcheck.vcxproj

@@ -18,8 +18,14 @@
     </ProjectConfiguration>
   </ItemGroup>
   <ItemGroup Label="SourceFiles">
-    <ClCompile Include="..\externals\simplecpp\simplecpp.cpp" />
-    <ClCompile Include="..\externals\tinyxml2\tinyxml2.cpp" />
+    <ClCompile Include="..\externals\simplecpp\simplecpp.cpp">
+      <PrecompiledHeader>NotUsing</PrecompiledHeader>
+      <ForcedIncludeFiles></ForcedIncludeFiles>
+    </ClCompile>
+    <ClCompile Include="..\externals\tinyxml2\tinyxml2.cpp">
+      <PrecompiledHeader>NotUsing</PrecompiledHeader>
+      <ForcedIncludeFiles></ForcedIncludeFiles>
+    </ClCompile>
     <ClCompile Include="valueflow.cpp" />
     <ClCompile Include="tokenize.cpp" />
     <ClCompile Include="symboldatabase.cpp" />

tools/dmake/dmake.cpp

@@ -250,7 +250,7 @@ static int write_vcxproj(const std::string &proj_name, const std::function<void(
     return EXIT_SUCCESS;
 }
 
-enum ClType : std::uint8_t { Compile, Include, Precompile };
+enum ClType : std::uint8_t { Compile, Include, Precompile, NoPch };
 
 static std::string make_vcxproj_cl_entry(const std::string& file, ClType type)
 {
@@ -271,6 +271,18 @@ static std::string make_vcxproj_cl_entry(const std::string& file, ClType type)
         outstr += "    </ClCompile>\r\n";
         return outstr;
     }
+    if (type == NoPch) {
+        outstr += R"(    <ClCompile Include=")";
+        outstr += file;
+        outstr += R"(">)";
+        outstr += "\r\n";
+        outstr += R"(      <PrecompiledHeader>NotUsing</PrecompiledHeader>)";
+        outstr += "\r\n";
+        outstr += R"(      <ForcedIncludeFiles></ForcedIncludeFiles>)";
+        outstr += "\r\n";
+        outstr += "    </ClCompile>\r\n";
+        return outstr;
+    }
     outstr += "    <";
     outstr += (type == Compile) ? "ClCompile" : "ClInclude";
     outstr += R"( Include=")";
@@ -542,8 +554,8 @@ int main(int argc, char **argv)
     });
 
     write_vcxproj("lib/cppcheck.vcxproj", [&](std::string &outstr){
-        outstr += make_vcxproj_cl_entry(R"(..\externals\simplecpp\simplecpp.cpp)", Compile);
-        outstr += make_vcxproj_cl_entry(R"(..\externals\tinyxml2\tinyxml2.cpp)", Compile);
+        outstr += make_vcxproj_cl_entry(R"(..\externals\simplecpp\simplecpp.cpp)", NoPch);
+        outstr += make_vcxproj_cl_entry(R"(..\externals\tinyxml2\tinyxml2.cpp)", NoPch);
 
         for (const std::string &libfile: libfiles_prio) {
             const std::string l = libfile.substr(4);