topic Re: Using c++ in MQX project in MQX Software Solutions

Using c++ in MQX project

amleng — Wed, 14 Nov 2012 21:52:03 GMT

Hello all,

I try to use c++ classes in my mqx project. I have file system, rtcs and usb middlewares in this project. I added a cpp file to the project but I get error on brackets! I'm sure the notation/syntax is correct. I use CW 10.2. I enabled cpp in bsp as well. any suggestion?

Thanks!

Re: Using c++ in MQX project

c0170 — Thu, 15 Nov 2012 06:45:53 GMT

Hello,

BSPCFG_ENABLE_CPP is set to 1 and was rebuilded bsp? Have you tried to turn on a setting "Force C++ compilation"?

Regards,

MartinK

Re: Using c++ in MQX project

amleng — Thu, 15 Nov 2012 18:04:28 GMT

yes I did. it didnt help. I found the following changes for coldfire but not for kinetis (ARM) family.

- in Project -> Properties -> C/C++ Build -> Settings -> Librarian

o set “Model” to “ewl_c++”

- in Project -> Properties -> C/C++ Build -> Settings -> ColdFire Compiler -> Input

o add "${MCUToolsBaseDir}/ColdFire_Support/ewl/EWL_C++/include" in “System Path”

- in Project -> Properties -> C/C++ Build -> Settings -> ColdFire Compiler -> Language Settings

o check “Force C++ Compilation”

o check “Enable C++ Exceptions”

o check “Enable RTTI”

Re: Using c++ in MQX project

amleng — Thu, 15 Nov 2012 18:09:13 GMT

what I need to do is mixing C with C++ in a MQX project using CW 10.2 on K60 platform. I wont use C++ library function but I need to use classes and other OO concepts.

Re: Using c++ in MQX project

c0170 — Fri, 16 Nov 2012 07:14:37 GMT

Hello Sina Moshksar,

create new simple c++ application with two classes for instance which links your MQX libs (I would start only with bsp/psp) and build it if it passes without any error.

We have no much information what errors you run into. If I build new application with some c++ syntax for k60 in CW 10.2, application builds without errors.

Regards,

MartinK

Re: Using c++ in MQX project

amleng — Fri, 16 Nov 2012 17:18:59 GMT

Hi Martink,

I have two basic question here:

1- how can I create new simple c++ application?

2- What do you mean by link MQX libs? How can I link bsp/psp to the application? isn't it done automatically during project creation?

Re: Using c++ in MQX project

Martin_ — Mon, 19 Nov 2012 07:20:11 GMT

In MQX 3.8.1, build MQX libs with #define BSP_ENABLE_CPP 1 in your user_config.h.

Now refer to the example application called "cplus".
c:\Freescale\Freescale MQX 3.8\mqx\examples\cplus\
This one is hello world type of an application using MQX in C++.

Ad 1.
either: create new bare metal project and then add MQX *.h and *.a file (header and libs) of your board (in the \lib\<board_name>.<compiler> folder of your MQX installation directory)
to the compiler, assembler and linker properties of your build target.

or: use CW 10.2 New Project Wizard to create a new MQX 3.8 application, select your board and then example "cplus" project. This will create a new "cplus" application in your workspace, with all compiler, assembler and linker properties already set up for linkage with MQX 3.8.1 libraries.

Ad 2.
If you create a new bare metal application, you shall configure properties of compiler/assembler/linker manually in the properties of your build target.
If you create a new MQX 3.8 application, the new project wizard will configure the paths to the MQX header files and libraries for your <board_name>.<compiler> automatically.

If you're mixing C++ and C source files:
-make sure names of the source file(s) are not shared, for example, hello.cpp and hello.c should not be in one project
-you can call C functions from C++ source file. you just need to tell the C++ compiler that it should link the C function as a C object, using keyword: extern "C"

Re: Using c++ in MQX project

MarkP_ — Mon, 19 Nov 2012 10:14:42 GMT

Hi,

Which version of CW you are using? Special Edition (free) does not support C++.

At C++ project creation there is a mention:

"C++ is only available with the Professional Edition and the Standard Edition when the Enhanced Compiler Option is installed."

~Mark

Re: Using c++ in MQX project

ivanpajuelo — Thu, 29 Oct 2020 09:24:41 GMT

I found a C++ related error on some RTCS and USB headers that causes you can't link your project.

I'm not sure if this is your problem but in any case you need to add

extern "C" {
#include <header_not_linking>
}

to your source if you don't want to modify MQX headers.

If your problem is a compiler error, Can you put the error description and the piece of code where this error theoretically is?

Re: Using c++ in MQX project

c0170 — Thu, 22 Nov 2012 09:25:07 GMT

Hello Ivan,

thanks for this reminder .I totally forgot, those headers and linkage of C++ were fixed while ago , it will be fixed in next release. It could have been missed in previous releases. Sorry for troubles :smileyhappy:

Regards,

MartinK