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Vit Bernatik
Vit Bernatik

Reputation: 3802

keil compiler error - can not open source input file - but file exists

I compiled in Keil 5 using armcc: 

*** Using Compiler 'V5.06 (build 20)', folder: 'C:\Keil_v5\ARM\ARMCC\Bin'

and I got following error:

compiling softdevice_handler.c...
"no source": Error:  #5: cannot open source input file "..\..\..\..\..\..\components\softdevice\common\softdevice_handler\softdevice_handler.c": No such file or directory
..\..\..\..\..\..\components\softdevice\common\softdevice_handler\softdevice_handler.c: 0 warnings, 1 error

I was sure that source c file exists. I added it in GUI and I could open it in GUI.

So why compiler complains that file does not exists if file does exists?

Upvotes: 1

Views: 9479

Answers (1)

Vit Bernatik
Vit Bernatik

Reputation: 3802

Ok so I found that issue was windows 7 path length limit of ~255 bytes.

Combined with keil compiler stupidity. What it does is that it combines project path + relative resource path. So for example:

project path: projects/projectX/toolchain/keil5/projectX.uvprojx
src path is : projects/projectX/src/a/b/src.c

then what is used internally by armcc is:

projects/projectX/toolchain/keil5/../../a/b/src.c

it adds extra: 

 /toolchain/keil5/../../

So even if src.c is not too deep, it can go over 255 characters when you sum part of project path.

Solution for arm is to go to: Project->options->C/C++->Misc Controls and add "--reduce_paths". See keil armcc manual.

Another option is to copy project closer to root folder so maximum project path is reduced.

Upvotes: 5

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