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Re: Using @bindir@ etc. in C headers

From: Michael Orlitzky
Subject: Re: Using @bindir@ etc. in C headers
Date: Fri, 5 Jun 2020 07:09:07 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0

On 6/5/20 6:57 AM, Florian Weimer wrote:
> I would like to define macros containing the standard paths, like this:
> #define BINDIR "@bindir@"
> It does not work due to this code in lib/autoconf/general.m4 (which
> appears to be predate DESTDIR support):
> ...
> Is there are generally approved way to work around this?  The manual
> tells us to use -D preprocessor arguments, but I'd prefer the
> explicitness of defining the macros via a header file.

The autoconf manual's "Installation Directory Variables" section says
the following...

  Similarly, you should not rely on AC_CONFIG_FILES to replace datadir
  and friends in your shell scripts and other files; instead, let make
  manage their replacement. For instance Autoconf ships templates of its
  shell scripts ending with `.in', and uses a makefile snippet similar
  to the following to build scripts like autoheader and autom4te:

     edit = sed \
             -e 's|@datadir[@]|$(pkgdatadir)|g' \
             -e 's|@prefix[@]|$(prefix)|g'

     autoheader autom4te: Makefile
             rm -f $@ $@.tmp
             $(edit) '$(srcdir)/$' >$@.tmp
             chmod +x $@.tmp
             chmod a-w $@.tmp
             mv $@.tmp $@

     autoheader: $(srcdir)/
     autom4te: $(srcdir)/

Not very aesthetically pleasing, but it gets the job done.

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