Re: [avr-gcc-list] Make question (how to)

[Rich Neswold]

Wasn't it  2-May-2005, at 07:50AM, when Larry Barello said:
> target1:
>       MCU=mega128
>       SRC="this.c that.c ..."
>       ASRC="this.S that.S ..."
> 
> target2:
>       MCU=mega16
>       ... etc.
> 
> But this doesn't work.  The SRC and ASRC are not substituted for the default
> ones defined earlier in the makefile (MCU and other symbols are).

I don't run WinAvr, so I don't know which vendor's 'make' you're running.
The following discussion assumes GNU make (or BSD make, for that matter).
If you're using NMAKE.EXE, ignore the rest of this message.

For each line following a target, 'make' spawns a shell and runs it as a
command. Your rules cause several shells to be spawned. Each sets a
variable and then exits. I'm surprised that the MCU variable is working for
you.

> How do I do this?  What is the magic incantation to substitute a list?

In your Makefile:

ifeq (${MCU}, mega128)
  SRC="this.c that.c ..."
  ASRC="this.S that.S ..."
else
ifeq (${MCU}, mega16)
  SRC="this.c that.c ..."
  ASRC="this.S that.S ..."
endif
endif

Then you can invoke a target like this:

        $ make MCU=mega128

-- 
                                          Rich Neswold
 
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