Undefined symbol _main

Jovan Witherspoon

Other Parts Discussed in Thread: CCSTUDIO

I recently had to reinstall my Code Composer TMS320C2000 edition and ran into some problems after compiling my project. Before the reinstall, everything was fine. What's going on? Below are the results of my compilation.

[Linking...] "C:\CCStudio_v3.3\C2000\cgtools\bin\cl2000" -@"DebugFlash.lkf"
<Linking>
>> warning: creating output section $build.attributes without SECTIONS
            specification
>> warning: load address of uninitialized section ramfuncs ignored

undefined                        first referenced
symbol                              in file
---------                        ----------------
_main                            C:\Jovan\Gyrocam Systems LLC\Software\src\Common\Tools 5.2.5\lib\rts2800_ml_eh.lib
>>   error: symbol referencing errors - './DebugFlash/DHC_IFU_LHD.out' not built

>> Compilation failure

over 14 years ago

0 Ki over 14 years ago

TI__Guru**** 468181 points

You are using the runtime library and do not have a 'main' function defined in your code. Assuming this is expected, you need to use the -e linker option to specify the entry point of your application (otherwise it will default to _main):

0 Jovan Witherspoon over 14 years ago in reply to Ki

Prodigy 110 points

Thanks for the feedback. I will try your suggestion, however, I didn't have this problem before I reinstalled CCS. Also, I have main() defined in a file in the project. CCS should have been able to find it right?

0 Ki over 14 years ago in reply to Jovan Witherspoon

TI__Guru**** 468181 points

Jovan Witherspoon said:
Also, I have main() defined in a file in the project.

Then your source file with main() defined is somehow not being picked up during the build. Do you see that file building successfully when you do a project build?

0 Jovan Witherspoon over 14 years ago in reply to Jovan Witherspoon

Prodigy 110 points

I made the change as you can see here...

Now after I rebuilt the project again... I get the following error message:

[Linking...] "C:\Program Files\Texas Instruments\C2000 Code Generation Tools 5.2.5\bin\cl2000" -@"DebugFlash.lkf"
<Linking>
warning: cannot resolve archive C:/Program Files/Texas Instruments/C2000 Code
Generation Tools 5.2.5/lib/libc.a to a compatible library, as no input files
have been encountered
fatal error: no input files

>> Compilation failure

0 Jovan Witherspoon over 14 years ago in reply to Ki

Prodigy 110 points

When I do a project build, the 'Main.c' file does build successfully without error but I still get that other error I just mentioned above..

0 Ki over 14 years ago in reply to Jovan Witherspoon

TI__Guru**** 468181 points

You need to specify a symbol name for the -e option, not a file name. For main(), it would be '_main'. But if you are including the run time library, that should be the default. You should not have to specify it.