[Solved] #define weirdness

Troubleshooting
1

In my code if I have
<< Top of File >>
// A blank line
#define uchar unsigned char

and then later I have
uchar fred = 0;

The compiler says that uchar does not have a type.

BUT
if I remove the top blank line and make no other changes
The compiler is quite happy

Is this expected?

2

This is definetly not intended, but it’s also not unexpected :wink:

I expect you have this problem in an .ino file and not in a .cpp/.h file.
I’ve seen other users describing that some compile error (dis)appears whether or not there are blank lines or even single blanks in certain positions.
I myself recently had a problem where the preprocessor didn’t like my code because of this reason, but @Dave is the expert in this matter - he had put me straight on my problem.

One magic expression to remember in this case is #pragma SPARK_NO_PREPROCESSOR inside your .ino

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3

Thanks for the information. I have been having lots of problems with #define statements. If they are in an included .h file they are also not recognized.

I’ll try the
#pragma SPARK_NO_PREPROCESSOR
and see what that does.

4

Tried that and now it won’t compile for MANY reasons. That seems to have removed the basic functionality and reverted it to a very primitive form. As an example I get:
spi_test_cases.cpp:15:19: error: ‘D3’ was not declared in this scope
#define MRF_TX_RX D3

Are there now other includes I should add to make up for the lack of Arduino compatibility?

5

In this case you need to add this

#include "application.h"

This is one thing the preprocessor would do, if it wasn’t for the #pragma SPARK_NO_PREPROCESSOR

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6

Compiles. Is any of this written someplace that I should have known about?
Thanks.

7

Not as such in the docs, but it’s a somewhat special problem.

But in the forum if you searched for not declared in this scope this for example comes up

Or for #define this pops up

The search feature is a very handy way to find answers

But for the sake of having search work good for everyone, every poster should come up with a clear and descriptive topic headline.

3 Likes
8

I’m going to go ahead and mark this post as “solved.” If you have any additional comments feel free to respond to the thread!

1 Like