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Valued Contributor III
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alt_busy_sleep

Dear All, 

 

My code need to call alt_busy_sleep(), but the compiler report the following error. 

 

Linking TestCPP.elf... 

obj/main.o(.gnu.linkonce.t._ZN13JaidTestClass18TestOSDBlockAdjustEv+0x18c): In function `JaidTestClass::TestOSDBlockAdjust()': 

C:/altera/OSD_FINAL/JaidNiosOSD/software/TestCPP/TestClass/TestClass.hpp:352: undefined reference to `alt_busy_sleep(unsigned int)' 

 

I have include the necessary header file in my code, # include "priv/alt_busy_sleep.h" 

also I can find alt_busy_sleep.c in C:\altera\kits\nios2_51\components\altera_nios2\HAL\src. 

 

Why the linker can't find alt_busy_sleep yet. Evenly I copy alt_busy_sleep.c to project folder, but the error still exist... 

 

Anybody help... 

Thanks in advance http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/laugh.gif
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Valued Contributor III
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Re: alt_busy_sleep

 

--- Quote Start ---  

originally posted by david_cai@Jul 6 2006, 10:56 AM 

dear all, 

 

    my code need to call alt_busy_sleep(), but the compiler report the following error. 

 

linking testcpp.elf... 

obj/main.o(.gnu.linkonce.t._zn13jaidtestclass18testosdblockadjustev+0x18c): in function `jaidtestclass::testosdblockadjust()&#39;: 

c:/altera/osd_final/jaidniososd/software/testcpp/testclass/testclass.hpp:352: undefined reference to `alt_busy_sleep(unsigned int)&#39; 

 

    i have include the necessary header file in my code, # include "priv/alt_busy_sleep.h" 

also i can find alt_busy_sleep.c in c:\altera\kits\nios2_51\components\altera_nios2\hal\src. 

 

    why the linker can&#39;t find alt_busy_sleep yet. evenly i copy alt_busy_sleep.c to project folder, but the error still exist... 

 

anybody help... 

thanks in advance http://forum.niosforum.com/work2/style_emoticons/<#emo_dir#>/laugh.gif  

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=16681) 

--- quote end ---  

 

--- Quote End ---  

 

Hi David_Cai! 

I had this type of error when I had q5.1 and nios 5.0! 

Later I have installed Nios 5.1 and error had not occired. 

 

Please give more specific information about your system 

version of Q and Nios http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/smile.gif
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Valued Contributor III
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Re: alt_busy_sleep

nios2_5.1 

quartusii_51_sp1_web_edition.exe 

 

somebody tell me that: 

Do you use C and C++ files in your project? You should declare the function alt_busy_sleep() is a C function if you use it in a C++ file. 

 

But I don&#39;t know how can I declare the function alt_busy_sleep() is a C function in C++ files. 

Also I need to understand why. 

 

Thanks for your reply....
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Valued Contributor III
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Re: alt_busy_sleep

Dear All, 

 

I have solved this issue. 

 

The answer is : 

declare the function alt_busy_sleep() is a C function if you use it in a C++ file 

 

extern "C" unsigned int alt_busy_sleep (unsigned int us); 

 

But I still don&#39;t know why... 

 

Anybody help? 

David
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Highlighted
Valued Contributor III
3 Views

Re: alt_busy_sleep

Hi David 

 

The compiler rules for C and C++ are some what differ. when you write any code in C and if you want to access that function or structure in C++ file then explicitly you have to tell to compiler and it will call that perticular function( or Build) as a C style rules and gives no error. 

 

At the same time you if you want to access C++ code in C file then also you have to define a Macro for that. 

 

Here i am passing you one link..Just go through this and get the detail answer. 

If you have any query then Ask me  

 

http://developers.sun.com/prodtech/cc/articles/mixing.html (http://developers.sun.com/prodtech/cc/articles/mixing.html

 

Best Regards, 

slsnios
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Highlighted
Valued Contributor III
3 Views

Re: alt_busy_sleep

Thanks very much... 

I think that the basic reason is:  

The function name after compilation is different in C from that in C++. The declaration is necessary for both sides.
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