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Altera_Forum
Honored Contributor I
1,318 Views

Linking error. Problem on "undefined reference to...." in NIOS II IDE 11sp1

hello! 

I am new in quartus 11 and NIOS II IDE 11sp1 for development. The project concludes four source files. the main() function is in  

 

 

my_file_for_blank_project_0.cpp 

 

 

the other three source files all have their corsponding H files included in my_file_for_blank_project_0.cpp. 

 

 

But when I build project, the console shows : 

 

 

 

 

 

 

**** Build of configuration Debug for project my_blank_project_0 **** 

 

 

make -s all includes  

Compiling file_sys.c... 

Compiling hal.c... 

Compiling host.c... 

Compiling my_file_for_blank_project_0.cpp... 

Linking my_blank_project_0.elf... 

obj/my_file_for_blank_project_0.o(.text+0x1c4): In function `main': 

../my_file_for_blank_project_0.cpp:46: undefined reference to `host()' 

collect2: ld returned 1 exit status 

make: *** [my_blank_project_0.elf] Error 1 

 

 

the host() function is in host.c and also declared in host.h. the corresponding four *.o files can also be produced. 

 

 

I do not know how to solve it. 

Can anyone with kindness help me?
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1 Reply
Altera_Forum
Honored Contributor I
202 Views

I think this happens because your are mixing C and C++ source files. 

For example, If you want to call C++ code from a C source file you need the following definition in .cpp file: 

 

extern "C" int test_cpp_call (int n); 

 

int test_cpp_call (int n) 

.... 

}
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