Gerneral question about make files

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hi,

would know -i , -d mean in c make file. i'm trying port arduino project native c on mcu , in make file see line. cflag -d mean?

i have seen -i , -g on web without explanation.

code: [select]
cflags += -dstdout_uart_0

thanks

-d defines value can tested using #ifdef.
-i defines path include files


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