inflexible non-recursive support

[Werner LEMBERG <wl@gnu.org>]

[c7b1e060d17023065c776757da406d728310cc38]

Dear gnulib maintainers,


Currently, the script `prefix-gnulib-mk` replaces variables like
`libbison_a_SOURCES` with `lib_libbison_a_SOURCES`.  However, this
works only if the directory is indeed `lib/', which is not the general
case.  For example, in my project I would like to call the script as

  prefix-gnulib-mk --lib-name=libgnu gnulib/src/$gnulib_mk

I suggest a patch as below (which needs further polishing to properly
canonicalize the directory path, I guess).

A similar problem exists with
`modules/non-recursive-gnulib-prefix-hack`, which has the directory
name `lib` hard-coded.  Isn't it possible to modify `gnulib-tool` so
that it patches `non-resursive-gnulib-prefix-hack.m4` based on the
value of option `--source-base`?

Right now I have to manually patch `gnulib-comp.m4` (using function
`bootstrap_post_import_hook`) for changing `lib` to `gnulib/src`...


    Werner


======================================================================


diff --git a/build-aux/prefix-gnulib-mk b/build-aux/prefix-gnulib-mk
index 347ddcd64..4eea8b738 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 $varprefix;
 my $lib_name;
 
 sub usage ($)
@@ -162,7 +163,7 @@ 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)/${varprefix}$1/g;
 
   $lhs_and_assign_op . $rhs;
 }
@@ -243,6 +244,8 @@ sub process ($)
 
   my $file = $ARGV[0];
   $prefix = (dirname $file) . '/';
+  $varprefix = $prefix;
+  $varprefix =~ s{/}{_}g;
   warn "prefix=$prefix\n";
 
   process $file;