Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Thu, 23 Feb 1995 12:45:25 GMT

I recently worked out a better way of doing lists within the Makefiles and the 
CONFIG_EXTENSIONS (and CONFIG_BASE) inclusions.  The problem with the existing 
method is that you can't comment out a line in the middle of a make variable 
definition, so to remove one of the extensions or drivers you have to reorganise 
the list completely and move the commented out line to the end.  Can we change 
these files to use the += construct which gnumake 3.71 supports?  My favourite 
example is a reorganised base/src/drv/Makefile.Vx, which looks like this:

...

# module_types starts the driver list
SRCS.c	:= ../module_types.c
OBJS	:= module_types.o

SRCS.c	+= ../drvAb.c
OBJS	+= drvAb.o

#Don't include At5Vxi driver
#SRCS.c	+= ../drvAt5Vxi.c
#OBJS	+= drvAt5Vxi.o

SRCS.c	+= ../drvBB232.c
OBJS	+= drvBB232.o

...

If you really wanted to, you could have a macro (or whatever they call them in 
gnumake) which does both of these at the same time, then you'd only have to have 
a single line in the Makefile for each driver.  Any comments?

- Andrew

          ,_}\_.        Andrew Johnson, Technology Division
         /      \       Royal Greenwich Observatory
 ~~~~~~~| ,--/;. )~~~~  Madingley Road, Cambridge, UK
    .,  |/  (/  U       Phone: +44 (0)1223 374823
  .`., /_\ . .          Email: [email protected]
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System