Hi folks! I am working on a project for the ATtiny85, so flash memory is always a problem. I have some bitmaps defined in a separate header file, defined like this: const unsigned char joey [] PROGMEM = { 0x00, 0x00, 0x00, 0x00, ........, 0xf0, 0x98, 0x9c }; Then I have a table to access all the…

[image] lorandil: but the linker errors out because it doesn't find the structure I declated extern. You must define this structure in one of your .cpp files. .h files should only contain the declarations ( extern ... ), while you must have only one definition in a .cpp file. @gfvalvo descr…

[image] lorandil: I can provide more code if necessary. Please post a small but complete sketch that illustrates the problem

Ok, I created a minimal sketch and I think I found the source of the problem: My project consists of a project file (something.ino) a header file containing all the bitmaps (e.g. 'joey') a class header file (myClass.h) TWO files containing the class member functions (myClassA.cpp, myClassB.cpp), …

Hi folks, perhaps somebody is still watching? Here is the a full sample sketch: bitmapDrawing.cpp (499 Bytes) dungeon.cpp (464 Bytes) dungeon.h (761 Bytes) Problem.ino (101 Bytes) With the ATTinyCore the sketch uses 4218 bytes when the bitmap is only linked once. If 9 line in bitmapDrawing.cp…

[image] lorandil: If 9 line in bitmapDrawing.cpp is uncommented, Did you mean line 9 of dungeon.cpp? #define DISPLAY_SCALED_BITMAP [image] lorandil: Shouldn't the linker "know" that it is the same resource? ('#pragma once') is set... I don't know anything about the first part, but #…

[image] in0: Did you mean line 9 of dungeon.cpp? `` Yes, I did - sorry for the confusion. Ok, that explains the identical behaviour of the two compilers and confirms my guess that the problem is in my code... :slight_smile: I will try to declare the structure extern in one of the modules a…

I tried with extern and get my code to compile, but the linker errors out because it doesn't find the structure I declated extern. I give up for now, the one file approach works good enough and due to the limited flash capacity the files can't get too large :stuck_out_tongue_winking_eye: I will ma…

[image] lorandil: if anyone has a solution how to get it working with multiple source files, please let me know any See my Post #5 in this thread .

@gfvalvo Thanks for your tips on "best practices". They are surely true! Nonetheless that doesn't answer my remaining question on how to share access to a structure from two source files (implementing methods of the same class): [image] lorandil: If anyone has a solution how to get it working …

[image] lorandil: Nonetheless that doesn't answer my remaining question on how to share access to a structure from two source files (implementing methods of the same class): Post an MRE that demonstrates the problem. Make sure it's the smallest amount of code and files that demonstrates the p…

Mea Culpa - I seem to have missed something the last time I tried to proceed the way @gfvalvo suggested in his linked article. When I tried to create an MRE, everything worked as it was supposed to - so no more problem here anymore. Just a simple UTSE (User too stupid error) :wink:

Problem with Linker including same binary structure twice

Projects Programming

gfvalvo January 14, 2022, 10:06pm 9

See my Post #5 in this thread.

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Problem with Linker including same binary structure twice

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