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I use to define multi-line stuff, something like a help message, like this:
#define HELP_MSG "blabla\r\n" \
"Some other line"
Is there a way that I can avoid putting “\r\n” here, since I already have it defined in multiple line.
No,
\is merely used as a line continuation marker. If you need a line break, you need to include it explicitly in the string, as you’re doing.