How to #define a header file name in Compiler settings?

[hanshuckebein]

Some of my source files contain lines like this:

   #include UART_CONFIG_H       // Symbol to be defined via compiler -D option

Defining the name under Build options | Compiler settings | #defines like this:

   UART_CONFIG_H="uart_config.h"

produces the following compiler invocation:

avr-gcc ... -DUART_CONFIG_H="uart_config.h" -I. -I.. -I/usr/lib/avr/include -c ../uart-0.c -o obj/Release/uart-0.o

but this leads to a compiler error:

../uart-0.c:24:10: error: #include expects "FILENAME" or <FILENAME>

Why?

How to define UART_CONFIG_H in Build options | Compiler settings | #defines?

[zainka]

Use -D
Add -D to the compiler followed by the define of interest
-DUART_CONFIG_H

An example i use (not complete but ). As you may see you can also pass a value

arm-none-eabi-gcc -c -DUSE_HAL_DRIVER -DUART_CONFIG_H -DSYSTEM_TIME=10

[hanshuckebein]

Sorry, but that is no answer to my question. I want to know, how to do it via Build options | Compiler settings | #defines

[stahta01]

I think you did the CB part right.

But you might need to change

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#include UART_CONFIG_H       // Symbol to be defined via compiler -D option

To

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#include "UART_CONFIG_H"       // Symbol to be defined via compiler -D option


If the above fails try defining in CB as

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UART_CONFIG_H="\"uart_config.h\""

Tim S.

[stahta01]

Looks like you need a C or C++ Macro expert to answer this question.

Because I can not get it to work using a #define statement in C; therefore I can not help you figure out what looks possibly impossible.

Tim S.

[stahta01]

Found example code that worked for what you wanted.

In CB I have this set

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INCLUDE_FILE="stdlib.h"
Edit: The CB Define can also be done without the double quotes as in

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INCLUDE_FILE=stdlib.h
and it still works.

The program code had this below.

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#include <stdio.h>

#define STRINGIFY(X) STRINGIFY2(X)   
#define STRINGIFY2(X) #X

#include STRINGIFY(INCLUDE_FILE)

int main()
{
    printf("Hello world!\n");
    return 0;
}


[oBFusCATed]

The shell is probably removing the "" from your string.
Try to use double or triple quotes.
Unfortunately we don't have a macro to preserve quotes. We only have REMOVE_QUOTES.
The other option seems to be to use escaping like \".
I'm not sure this is cross platform or if you need it to be cross platform.

[hanshuckebein]

@stahta01:

Your trick using STRINGIFY doesn't work with avr-gcc. This probably depends on the behavior of the c preprocessor and might be implementation dependent.

@oBFusCATed:

I tested several versions with double and triple " with and without preceding \ – nothing works. It seems to be impossible to define a double quoted -D macro. Also using ' to protect " doesn't help.

The only way I found, to do the trick is adding the folder which contains the header file to the -I options and define the macro as -DUART_CONFIG_H=<uart_config.h>, but that's not really conforming to the rules.

[hanshuckebein]

I found the solution:

     -DUART_CONFIG_H=\\"uart_config.h\\"

[oBFusCATed]

We need a ESCAPE_QUOTES macro...