Re: Non-recursive Make and prefix-gnulib-mk

[Bruno Haible]

Marc Nieper-Wißkirchen wrote:
> I'm using build-aux/prefix-gnulib-mk to rewrite the Gnulib Makefile
> fragment so that it can be included by a Makefile in a top-level directory.
> 
> What I haven't managed to get working, though, is renaming the Gnulib lib/
> directory at the same time (by setting $source_base in bootstrap.conf). The
> Perl script build-aux/prefix-gnulib-mk still prefixes the Automake
> variables with lib_ as in
> 
> lib_libgnu_la_SOURCES =
> 
> I don't know much Perl but the relevant source line seems to be
> 
> https://git.savannah.gnu.org/cgit/gnulib.git/tree/build-aux/prefix-gnulib-mk#n165
> 
> The issue is possibly fixed just by replacing the string lib_ by %C% (see
> [1]).

Fixed through this patch.

You are right, %C% would also fix it. But since we are generating the Makefile
part anyway and know where it is located, we can just as well put in the actual
relative subdirectory. This makes the generated code easier to understand.


2021-12-15  Bruno Haible  <bruno@clisp.org>

        automake-subdir support: Support arbitrary --source-base value.
        Reported by Marc Nieper-Wißkirchen in
        <https://lists.gnu.org/archive/html/bug-gnulib/2021-12/msg00066.html>.
        * build-aux/prefix-gnulib-mk ($canon_prefix): New variable.
        (prefix): Initialize it.
        (prefix_assignment): Use it.

diff --git a/build-aux/prefix-gnulib-mk b/build-aux/prefix-gnulib-mk
index 36f7527fc..4f300c443 100755
--- a/build-aux/prefix-gnulib-mk
+++ b/build-aux/prefix-gnulib-mk
@@ -40,6 +40,7 @@ use File::Basename; # for dirname
 (my $ME = $0) =~ s|.*/||;
 
 my $prefix;
+my $canon_prefix;
 my $lib_name;
 
 sub usage ($)
@@ -171,7 +172,7 @@ sub prefix_assignment ($$)
 
   # Variables whose name depend on the location: libbison_a_SOURCES =>
   # lib_libbison_a_SOURCES.
-  $lhs_and_assign_op =~ s/($lib_name)/lib_$1/g;
+  $lhs_and_assign_op =~ s/($lib_name)/$canon_prefix$1/g;
 
   $lhs_and_assign_op . $rhs;
 }
@@ -187,6 +188,12 @@ sub prefix ($)
   # Work on $_.
   local ($_) = @_;
 
+  # $canon_prefix is derived from $prefix in the same way as Automake
+  # derives %canon_reldir% from %reldir%. See
+  # <https://www.gnu.org/software/automake/manual/html_node/Include.html>.
+  $canon_prefix = $prefix;
+  $canon_prefix =~ s/[^a-zA-Z0-9_]/_/g;
+
   # Prefix all the occurrence of files in rules.  If there is nothing
   # after in the :, it's probably a phony target, or a suffix rule.
   # Don't touch it.