C++ compiler errors

[Altera_Forum]

I am new to C++/ucos II. 

 Compiling a simple test C++ program gets the following error messages:   error: 'alt_irq_register' was not declared in this scope error: invalid conversion from 'void*' to 'OS_STK*' error: initializing argument 3 of 'INT8U OSTaskCreateExt(void (*)(void*), void*, OS_STK*, INT8U, INT16U, OS_STK*, INT32U, void*, INT16U)' error: invalid conversion from 'void*' to 'OS_STK*' error: initializing argument 3 of 'INT8U OSTaskCreateExt(void (*)(void*), void*, OS_STK*, INT8U, INT16U, OS_STK*, INT32U, void*, INT16U)'   Any help will be appreciated.

[Altera_Forum]

Having the source to look at (or at least the correct segment) would be helpful. 

 First problem alt_irq_register not declared is you probably need the appropriate header file, the second problem look at what you have in the third argument position on your OSTaskCreateExt and either type-cast it to OS_STK* or define it properly.

[Altera_Forum]

Thank you, anakha 

 I forgot to mention that the same source is compiler error free using C. I got the error messages after renaming the program from .c to .cpp.   Below is the relevant source codes:    -----------  alt_irq_register(UART_IRQ,&context_uart,IsrUart );    OSTaskCreateExt(task1,  NULL,  (void *)&task1_stk[TASK_STACKSIZE-1],  TASK1_PRIORITY,  TASK1_PRIORITY,  task1_stk,  TASK_STACKSIZE,  NULL,  0);      OSTaskCreateExt(task2,  NULL,  (void *)&task2_stk[TASK_STACKSIZE-1],  TASK2_PRIORITY,  TASK2_PRIORITY,  task2_stk,  TASK_STACKSIZE,  NULL,  0); ----------

[Altera_Forum]

The GCC behaves different for c and c++ code. This is caused by the different file extentions. To make some library code like OS code run under c++ you have to declare it properly as "pure" c code. This is also required for some other hardware interface stuff. 

 for example:     #ifdef __cplusplus  extern  "C"  { #endif      // c specific stuff      #ifdef __cplusplus  } #endif   

[Altera_Forum]

Thank you, Karsten

[Altera_Forum]

Hello, 

 I'm working on a µC/OS II project using some C++. Compiling the example project "Hello MicroC/OS-II" works and simply changing the file extension from .c to .cpp or changing the target type in the makefile will still, in contrast to shacler, let project compile. But the Nios II build environment seems to have a problem to link the object files:  make: *** [Cpp_Test.elf] Error 1 Cpp_Test C/C++ Problem  and in the console output:  [...] Cpp_Test_bsp/HAL/src/alt_main.c:154: undefined reference to `main'  Any hints on how to fix this problem? According to the documentation C++ should work.  Thanks in advance!

[Altera_Forum]

Sorry for pushing but the handover date is approaching :-S