On Nov 20, 2007 9:11 AM, Ken Smith <[EMAIL PROTECTED]> wrote:
> On Nov 20, 2007 3:02 AM, Robert P. J. Day <[EMAIL PROTECTED]> wrote:
> > wanted: a simple way to transform the string (and its entries):
> > -Ia -I/b -Ic -I/d
> > to
> > -I/src/a -I/b -I/src/c -I/d
>
> Here is a solution but I'm not sure if you will consider it short and sweet.
>
> paths := a /b c /d
> abspaths := $(filter /%,$(paths))
> relpaths := $(filter-out /%,$(paths))
> qual-paths := $(addprefix /src/,$(relpaths)) $(abspaths)
That reorders the paths, putting all the previously-relative paths
before all the previously-absolute paths. That may not be acceptable.
To preserve the order, perform the transformation inside a
$(foreach):
# A function that adds $1 as a prefix to any non-absolute paths in $2
make-absolute = $(foreach dir,$2,$(if $(filter-out /%,${dir}),$1)${dir})
absprefix = /src/
paths = a /b c /d
abs-paths = $(call make-absolute,${absprefix},${paths})
Chaining that with $(patsubst) to strip and re-add the -I should be
straightforward.
Philip Guenther
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