I had built a c++ dektop project with VS17.
Now due to certain requirements, I needed it to migrate to VS19.
After making changes to compile my project with VS19, I am seeing many errors like below:
C3646 'OVERRIDE': unknown override specifier
C2039: 'wstring': is not a member of 'std'
I found this link - https://learn.microsoft.com/en-us/cpp/error-messages/compiler-errors-2/compiler-error-c3646?view=msvc-170
but could not find it useful to fix my issue.
I am looking for an easy fix, like if there is a way to use VS17 c++ compiler in VS19.
Rather than going back to the old compiler, you might be better off tackling the errors one-by-one:
OVERRIDE: is probably defined as macro somewhere in your project. Find out, what value OVERRIDE is being resolved to. Put the cursor into the word OVERRIDE to get the value. It could be that the respective include file is not properly included for some reason. Does your old project include a forced include for global definitions?
wstring: to be recognized as std::wstring, you have to include <string>.
Check your UNICODE settings. They determine the usage of 8-byte vs. multi-byte characters for strings. Look at Configuration Properties / Advanced / Character Set in the solution properties.
Related
When I open a generated solution+project file, I get the following warning for each platform I have in the project file:
path/to/project.vcxproj : warning : Platform '[some_platform, 0]' referenced in the project file 'project' cannot be found.
some_platform is a valid platform in the project, and building, browsing etc all work normally. There is no line number showing where the problem is.
My question is, what does '[some_platform, 0]' really mean?
Coming from Linux, I initially thought the quotes signify that I have [some_platform, 0] literally specified somewhere, which I don't. I don't see ,\s*0 used anywhere in the project file either. How do I decipher that message to be able to find out what it's complaining about?
This is a C++ project if that matters.
Edit: The only places , is even used are inside two messages and an SDK reference. So the [some_platform, 0] is definitely something constructed for the sake of warning, but what does the second part (0) mean?
Resolved: Why VS generates an output like that, I don't know, and who knows what the 0 means. However, it turned out that the platform name is something an SDK would register with VS (or something along those lines) and VS expects it case-sensitive. I had changed ORBIS and Durango to orbis and durango, causing the warning. Fixing the case makes the warning go away (the project was loading and building fine regardless).
I think you might have unmatched solution/project platform and build configurations, resulting in the rare case when visual studio defines or creates new ones: https://msdn.microsoft.com/en-us/library/kkz9kefa.aspx ending in the odd platform names '[some_platform, 0]', '[durango, 0]' and '[orbis, 0]' you have.
Now this is entirely my guess (since I could not find any documents to confirm it). But what that 0 actually means, is the reference to the default build configuration that project should use when you target those individual platforms. For instance, you usually have lines similar to this in the solution (.sln) file:{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}.Debug|Mixed Platforms.Build.0 = Debug|Any CPU
In the case above you would use build configuration 0 as the default build configuration when using msbuild solutionname.sln from the console. But since the entire platform was generated for that project, we of-course don't have a default build configuration either, so... lets generate. There is more details and examples of the default build-configuration in this post: Visual Studio solution file - what does the "Build.0" mean?
Now back to what might actually be your real problem. You mentioned SDK references, have you made sure they are pointing to the correct place and any environment variables is properly configured in visual studio? If not, the problem might be related to the warnings mentioned here:
Platform 'Android' referenced in the project file 'san-angeles' cannot be found. The warning message on that question sure looks similar to the warning you have, only you have those oddly generated platform names.
Hope this will help you solve the problem.
I created a multi-module project with a single sonar-project.properties. Most of the project is in c but one module is c++. I left the sonar.language property blank and ran sonar-runner with analysis.
The project and modules were created in the database and everything looked OK but when I did a preview on the same code I had a large number of new issues on the c++ project.
On closer inspection I found that the module in sonarqube was all wrong - it consisted of only the header files (.h) and most of the issues were the use of C style comments. It seems that the module was identified as a C module so all the .cpp files were ignored. However, in the preview the language was identified correctly and issues were found in the .cpp files that were clearly not know to sonarqube.
I cannot find any place in the UI to change the language of a module nor can I figure out a way to force it after the fact in my sonar-project.profiles.
First, sonar.language is apparently deprecated, and second, using module.sonar.language=cpp caused an error:
Caused by: sonar.profile was set to 'DEFAULT_C' but didn't match any profile for any language. Please check your configuration.
DEFAULT_C is something that we use for projects generally but not the one I'm working on. I have different profiles set up for different languages via the UI, but if I cannot get the analysis to see the correct language it doesn't help me much.
Any one have any idea how I can force the language of a module after the fact?
Hmm. I considered just deleting this but if I had found an answer on stackoverflow it would have eased my pain a little.
Brute force works.
Just set the language and the profile you want for the moudle and ignore complaints about such things being deprecated. Chosing a language won't force the right profile even if you have set up an explicit profile for the language in the UI - so just state it in the sonar-project.properties file.
In my case:
module.sonar.language=cpp
module.sonar.profile=MY_CPP_PROFILE
Throw sonar-runner at that and it will beat the backend into shape.
With the risk to fall into too specific question...
Given a C++ MFC (mixed, not shaked) project compiled with /CLR, I have 200 classes already defined.
When I add a new empty class to this project, an error raises when I compile and execute in debug mode.
An unhandled exception of type 'System.IO.FileLoadException' occurred
in Unknown Module.
Additional information: Could not load file or assembly 'ProjectA,
Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its
dependencies. Could not find or load a type. (Exception from HRESULT:
0x80131522)
ProjectA is the name of the MFC project itself. There is no reference to any ProjectA assembly on project configuration, and there is no reference to another custom assembly.
This project only have references to some .NET Framework assemblies, in order to allow that some of custom defined classes in the project can use CLR classes.
Then, the question is...
Do you know whether there is any limitation of class number on a MFC C++ project?
EDIT:
As I say in comments, in release mode the compilation succeed without errors.
Also, I clean, build, clean, close Visual Studio, reboot computer... and the problem still appears.
If I keep in 200 classes, there is no error. When I go to 201, the error appears.
Currently I'm trying to reproduce in a new default MFC project, adding classes till arrive to 200, to confirm that there is a real limitation.
EDIT 2: ERROR FIXED
Great. #MSX and #frymode show me how avoid the error with his comments.
In the Visual Studio development environment (source / source):
Open the project's Property Pages dialog box.
Click the C/C++ folder.
Click the Code Generation property page.
Modify the Enable String Pooling (/GF) property.
Thank you guys!
The /GF hack is a known workaround for this problem. It is however not a correct one, you are putting a band-aid on a heavily bleeding wound. Pretty important that you heal the problem instead of putting a patch on it, this heavily affects the way your program runs at runtime as well.
The problem maker is the <Module> class, an internal class that the C++/CLI compiler generates. You can see it with ildasm.exe or a good decompiler. This class is required as a home for declarations in your program that are not class members, valid in native C++ but not supported by the CLR. Which demands that every variable or function declaration is a member of a class. The C++/CLI compiler solves it by moving such a declaration into the <Module> class.
There is however a limit on the number of members in a class, they are represented in the metadata of the .NET assembly with a metadata token. An index into other tables. The upper byte identifies the table number, the lower bytes are the index in the table.
You exceeded that limit. This is bad.
A problem with the /clr compile option is that it works too well. It is capable of compiling any C++03 compliant native C++ code to MSIL. Such code will be just-in-time compiled to machine code by the jitter, just like normal managed code. It is however not verifiable code and it doesn't act like managed code at all, you can blow up your program with pointer fumbles just as easily. And above all, it is not code that's optimized with the native C++ back-end. Only the jitter optimizer has a shot at improving that code, it cannot do nearly the quality job that the native C++ optimizer can do, given that it runs with a hard upper limit on how much time it can spend on doing that job.
Have a look-see with a decompiler to see what ended up in that <Module> class. That's going to be overwheliming at first, you know you've got a big one right now. You fix this problem by spending more time segregating the code into the managed parts and the native parts. Where the native code should be compiled without /clr in effect. It is a per-source file setting, you can even switch back-and-forth in a single source code file with #pragma managed. The simplest way to segregate is by keeping your native code in its own library or DLL.
This link shows that there's no limit to the number of types you can have in a namespace (not a project). Considering, that a namespace can be split across different assemblies, you could, at least in theory, have an unlimited number of types. However, this post affirms that the maximum number of classes in a .DLL
is 16777215. Probably, you'll run out of memory before you reach that number of classes :)
Just for information: there seems to be a limit to the number of fields per class, though.
P.S.:
Here's the solution to your problem taken from this link
Open the project's Property Pages dialog box.
Click the C/C++ folder.
Click the Code Generation property page.
Modify the Enable String Pooling property.
I'm working on a C++ project (VS 2010) using CPLEX.
I have included the required cplex libraries in the project settings as follows:
added the "additional include directories" under C/C++ > general
added the "additional library directories" under linker > general
added the .lib files as "additional dependecies" under linker > input
Everything compiles fine, however my problem is that intellisense still reports errors (red squiggly underlines) such as "cannot open source file" in the #include line, and "identifier undefined" when using variable types defined in the CPLEX library.
The only difference with other projects that don't have this behaviour is that this time I have used windows environment variables in setting the include path, i.e. the library directories and include directories are defined similar to: %CPLEX_STUDIO_DIR%\cplex\include
I have set it like this so that I can build this project on different machines without messing around in the project properties. Since CPLEX is installed separately, using relative paths to specify additional directories is not really an option.
I'd like to repeat that the project compiles, it's only the intellisense errors that are bothering me.
I know I can turn off the intellisense error reporting, but if someone has a workaround for this I'd love to hear about it.
Kind regards,
This problem is known to Microsoft:
http://connect.microsoft.com/VisualStudio/feedback/details/779874/intellisense-cant-handle-using-environemt-variable-in-include-path
The only way I know of to avoid it is to manually enter the full literal path. The bug is marked "deferred" which I think means Microsoft has regarded it not serious enough to be fixed soon.
The solution is to replace %CPLEX_STUDIO_DIR%\cplex\include with $(CPLEX_STUDIO_DIR)\cplex\include. This is the syntax Visual Studio uses for its built-in variables such as $(VCInstallDir), but it also works for environment variables (so long as they don't have the same name as a built-in variable) and is recognised by intellisense as well as the compiler.
(I realise this is an old question, but it ranks highly in search results so it could help others even if not the original poster.)
Here's a different one from the usual confusion over duplicate symbol errors... :-)
I'm working on some legacy Mac code in an Xcode project that has the same global, "trace", defined in several different source files - for instance:
File1.c: SInt32 trace;
File2.c: Boolean trace;
etc. It's clear the original author meant them to have file-specific scope, but just neglected to prefix any of these lines with "static". That's fine, easy enough to fix.
But I'm kind of shocked the linker isn't flagging these! It looks to me like Xcode's linker (I presume gnu ld) only emits duplicate symbol warnings or errors for functions, that are linked into the code segment - but not global variables that are linked into the data segment. Instead, it silently conflates them, which is causing bugs.
So... how do I convince Xcode to emit link errors for duplicate global variables? Or get this information in some other way that can be a routine part of my build?
Well, I thought I'd answered my own question... :-)
I posted earlier:
So if you're using Xcode with LLVM GCC
4.2, go to the build settings dialog, find the "LLVM GCC 4.2 - Code
Generation" section, and check the "No
Common Blocks" checkbox. This enables
the compiler's "-fno-common" option,
and changes the object file generation
so that ld will choke and emit an
error if you have two globals in
different source files with the same
name.
Unfortunately, that doesn't seem to solve all instances. It seems to work fine if all the globals have the same type.
But the example in the question is taken straight from the code, where a variable named "trace" is defined as a global in two different files with two different types. And that's still not caught by the build system when I check that checkbox.