Re: Why doesn't this work properly?

[Rick Flower]

Philip Guenther wrote:

> That requires all the possibilities to exist, and then always makes a
> link to the one under 'hardware'.  There are two ways to do what you
> want:
>
> 1) include a static pattern rule for each source directory:
>
> # create static rules for all the files under .../hardware/src/
> $(notdir $(filter \
>     ${TOP_DIR}/teststubs/hardware/src/%,$(TESTSTUB_SOURCES))): %: \
>     ${TOP_DIR}/teststubs/hardware/src/%
>         ln -sf $< $@
>
> # create static rules for all the files under .../common/src/
> $(notdir $(filter \
>     ${TOP_DIR}/teststubs/common/src/%,$(TESTSTUB_SOURCES))): %: \
>     ${TOP_DIR}/teststubs/common/src/%
>         ln -sf $< $@

I think I tried this and make was complaining about macro
redefinitions or something along those lines.  However, I'll try
it again..


> 2) instead of specifying the full path of each stub, just specify the name
>     and let make pick the path by searching the directories in some order
>     by supplying multiple pattern rules:
>
> # make tries these in order
> %: ${TOP_DIR}/teststubs/hardware/src/%
>         ln -sf $< $@
> %: ${TOP_DIR}/teststubs/common/src/%
>         ln -sf $< $@
>
> It helps if you can narrow down the left side of the pattern (.cc
> files only?  use "%.cc", etc), or limit the files in the source
> directories to exactly the files that you want link rules for, but
> this method suffers from giving make rules for more than you might
> want.

Cool.. I'll try that out too..

> 3) like (1), but use foreach and eval to generate the rules for all the
>     directories in the list automatically:
>
> # Given ${d} set to the name of a directory (with trailing slash) of
> # stub sources, expand to the rule that should be eval'ed:
> define link-rule
> $$(notdir $$(filter ${d}%,$${TESTSTUB_SOURCES})): %: ${d}%
>         ln -sf $$< $$@
> endef
>
> # eval the above link rule, setting ${d} in turn to each directory that
> # contains stub sources:
> $(foreach d,$(sort $(dir ${TESTSTUB_SOURCES})),$(eval ${link-rule}))

Good.. three things to try.. I like choices.. (8->

Anyway, I won't be able to try these until Tuesday.. Thanks again!