Re: No rule to make target

[thutt]

Federico Bruni writes:
 >
 >
 > Il giorno gio 29 mar 2018 alle 18:18, address@hidden ha scritto:
 > > Federico Bruni writes:
 > >  >
 > >  >
 > >  > Il giorno gio 29 mar 2018 alle 15:56, Paul Smith <address@hidden>
 > > ha
 > >  > scritto:
 > >  > > On Thu, 2018-03-29 at 14:09 +0200, Federico Bruni wrote:
 > >  > >>  VPATH = \
 > >  > >>    $CURDIR/src
 > >  > >
 > >  > > This is wrong.  This expands the make variable $C and appends the
 > >  > > string "URDIR/src".  Since C is not set (most likely) you'll get:
 > >  > >
 > >  > >    VPATH = URDIR/src
 > >  > >
 > >  > > which doesn't exist, so this is a no-op.
 > >  > >
 > >  > > You meant:
 > >  > >
 > >  > >     VPATH = $(CURDIR)/src
 > >  >
 > >  > Yes, indeed, it's an oversight.
 > >
 > >  Here's one way that VPATH can be used, with your original directory
 > >  structure.  The example is a bit convoluted.  A recursive Make
 > >  invocation is done to make the working directory be the 'out'
 > >  directory.  The VPATH allows the sources to be found in the 'src'
 > >  directory:
 > >
 > >     export ROOT     ?= $(shell pwd)
 > >     VPATH           = $(ROOT)/src
 > >     MD              = $(wildcard $(ROOT)/src/*.md)
 > >     PDF             = $(addsuffix .pdf, $(notdir $(basename $(MD))))
 > >
 > >     %.pdf: %.md
 > >             echo pandoc -f markdown -o $@ $<;       \
 > >             touch $@;
 > >
 > >     all:
 > >             $(MAKE) -C $(ROOT)/out -f $(ROOT)/$(lastword
 > > $(MAKEFILE_LIST)) book
 > >
 > >     book:   $(PDF)
 > >
 >
 > This works, thank you!
 >
 > I see that here you use pwd because Make enters the out directory, so
 > $(CURDIR) is not the best choice.
 >

 My preference would be to not use 'shell' to set ROOT.  I did that
 for example purposes.  If I was doing this for myself or for my
 employer, I would require ROOT to be set before the Makefile was
 executed.   One concrete reason for being that setting ROOT using
 'pwd' will not work properly if one does:

   cd /tmp;
   make -f ~/source/pdf-project/Makefile


thutt
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