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 Posted: Jun 03, 2012 - 10:35 PM |
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Joined: Jun 03, 2012
Posts: 5
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Hey,
I try to include a CAN library in my project but it just doesnt work. I tried the following:
1. Configure config-file and makefile
2. compile makefile
3. put libcan.a in linker of avr 5
4. include can.h and config.h files
Now I think that I have to put the right LDFLAGS into the makefile. Can anyone tell me if I´m on the right way? Or is this method complety false?
Thank you!
Lawrence |
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Posted: Jun 04, 2012 - 07:49 AM |
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Joined: Oct 16, 2010
Posts: 138
Location: India
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Can you post the error message you get while compiling your project? This will give us better understanding of the problem.
Quote:
Now I think that I have to put the right LDFLAGS into the makefile. Can anyone tell me if I´m on the right way? Or is this method complety false?
It should be noted that makefile is generated everytime when "Build -> Build Solution" is done.
Hence don't edit the makefile, rather give LDFLAGS your option through project properties "Project -> Properties -> Toolchain -> Linker"
If you still would like to make use of the static "MakeFile" for your project, select the "Use External MakeFile" option in the "Project -> Properties -> Build" and provide the makefile with its directory.
Note: You can also use the auto generated makefile that is available at "<Project_Folder>/<Configuration_Name>/Makefile"
<Configuration_Name> by default would be Debug |
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Regards,
Deena
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Posted: Jun 04, 2012 - 12:52 PM |
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Joined: Jun 03, 2012
Posts: 5
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| The error code is: undefined reference to... And then the method name. I just didnt find any solution. |
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Posted: Jun 04, 2012 - 01:31 PM |
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Joined: Jul 18, 2005
Posts: 62329
Location: (using avr-gcc in) Finchingfield, Essex, England
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Quote:
The error code is: undefined reference to...
Well that's a linker error saying the named function cannot be resolved in the link by any .o or .a presented to the build - so you probably are not succeeding in linking the right libxxxx.a file |
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Posted: Jun 04, 2012 - 02:09 PM |
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Joined: Jun 03, 2012
Posts: 5
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| But i linked it in project properties->toolchain and then linker. Do i have to put the path also in the directions field? Or do i have to use the external makefile from which i have have my Libcan.a? |
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Posted: Jun 04, 2012 - 02:12 PM |
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Joined: Jul 18, 2005
Posts: 62329
Location: (using avr-gcc in) Finchingfield, Essex, England
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Are you using AS5 or AS6. AS5 was a bug ridden version of what went on to become AS6. One of the things fixed was a problem with paths to library files. I suspect you are falling foul of this if still using AS5.
(you can check the .map file to see what actually got linked). |
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Posted: Jun 04, 2012 - 02:49 PM |
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Joined: Jun 03, 2012
Posts: 5
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| I use as5. is it easier with as6? do you maybe have a tutorial for that? |
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Posted: Jun 05, 2012 - 11:33 AM |
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Joined: Jul 18, 2005
Posts: 62329
Location: (using avr-gcc in) Finchingfield, Essex, England
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| AS6 is nothing more than AS5 with a lot of the bugs fixed. You'd be mad to still use AS5. |
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Posted: Jun 06, 2012 - 07:40 PM |
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Joined: Jun 03, 2012
Posts: 5
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Could it be that as5 had problems with including libraries trough the toolchain menue? Because I downloaded as6 and exactly did the same like in as5 and now it works!
This might be a dumb question now: If I use a method from the library and the compiler doesnt give any errors like "no such file" or "missing reference" I can be sure that as6 now finds the library and is usable?
Lawrence188 |
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Posted: Jun 08, 2012 - 09:45 AM |
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Joined: Jul 18, 2005
Posts: 62329
Location: (using avr-gcc in) Finchingfield, Essex, England
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Quote:
Could it be that as5 had problems with including libraries trough the toolchain menue? Because I downloaded as6 and exactly did the same like in as5 and now it works!
Perhaps you missed:
Quote:
AS5 was a bug ridden version of what went on to become AS6. One of the things fixed was a problem with paths to library files. I suspect you are falling foul of this if still using AS5.
Quote:
I can be sure that as6 now finds the library and is usable?
If in doubt check the .map file which shows what's in the binary and where it came from. |
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