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Re: parallel build issues

From: Werner LEMBERG
Subject: Re: parallel build issues
Date: Mon, 21 Jun 2021 18:45:20 +0000 (UTC)

> For example, perhaps you have the same "frontend" directory listed
> also in SUBDIRS for some other unrelated makefile?  That is probably
> the simplest way this situation could happen.

The problem is as follows.

* In the `frontend` directory, the binary `ttfautohintGUI` is built.

* In the `doc` directory, I need the `ttfautohintGUI` binary to create
  a snapshot image of its GUI.  To do this, I have something like the
  following rule:

    ttfautohintGUI.png: $(top_srcdir)/frontend/maingui.cpp \
                        $(top_srcdir)/ \
            cd $(top_builddir)/frontend \
               && $(MAKE) $(AM_MAKEFLAGS) ttfautohintGUI$(EXEEXT)
            $(SHELL) $(srcdir)/ \
I must admit that I no longer remember why I did it this way.  It
works fine for non-parallel builds (and I have obviously never tested
with make's `-j` option).

Now I want to do better :-) However, the problem persists:
`ttfautohintGUI` gets built in the `frontend` directory, and there is
a dependency on the binary in the `doc` directory.  Is there a clean
solution for that?


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