Question

I have many different 3 axis sensors I am writing test code for. In the C files for each of them, I have the same char string defined:

char axis[3][8] = {"X", "Y", "Z"}

which I use when I “for” loop results to print the axis that is failing like this:

DEVICETEST_LOG("%s Failed %s axis for Min range\n",device_name[DUT], axis[i]);

I was thinking to save some space I could define a character string array in a header file to use all over the place.

I have tried a number of things, but I can’t seem to get an array of strings defined in my header file that I can iterate through to pass a compile.

Answer 1

In order to avoid linker errors, you have to declare your array as extern in a header file, and then define the array once in one of your code modules.

So for instance:

//myheader.h
extern const char* axis[3];

then in another code module somewhere:

//myfile.c
const char* axis[3] = { "X", "Y", "Z" };