Refactor linker script generation

The generation of linker scripts was badly balanced, as all sorts of
platform dependent stuff went into the top build.info, when that part
should really be made as simply and generic as possible.

Therefore, we move a lot of the "magic" to the build files templates,
since they are the place for platform dependent things.  What remains
is to parametrize just enough in the build.info file to generate the
linker scripts correctly for each associated library.

"linker script" is a term usually reserved for certain Unix linkers.
However, we only use them to say what symbols should be exported, so
we use the term loosely for all platforms.  The internal extension is
'.ld', and is changed by the build file templates as appropriate for
each target platform.

Note that this adds extra meaning to the value of the shared_target
attribute.

Reviewed-by: Tim Hudson <tjh@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7333)

1 files changed, 11 insertions, 8 deletions

diff --git a/Configure b/Configure
index a1db916..de4ca68 100755
--- a/Configure
+++ b/Configure
@@ -1121,7 +1121,9 @@ $target{exe_extension}="";
 $target{exe_extension}=".exe" if ($config{target} eq "DJGPP"
                                   || $config{target} =~ /^(?:Cygwin|mingw)/);
 $target{exe_extension}=".pm"  if ($config{target} =~ /vos/);
-
+$target{def_extension}=".ld";
+$target{def_extension}=".def" if $config{target} =~ /^mingw|VC-/;
+$target{def_extension}=".opt" if $config{target} =~ /^vms/;
 ($target{shared_extension_simple}=$target{shared_extension})
     =~ s|\.\$\(SHLIB_VERSION_NUMBER\)||
     unless defined($target{shared_extension_simple});
@@ -2074,11 +2076,11 @@ EOF
                     my $o = cleanfile($buildd, $o, $blddir);
                     $unified_info{shared_sources}->{$ddest}->{$o} = -1;
                     $unified_info{sources}->{$o}->{$s} = -1;
-                } elsif ($s =~ /\.(def|map|opt)$/) {
-                    # We also recognise .def / .map / .opt files
+                } elsif ($s =~ /\.ld$/) {
+                    # We also recognise linker scripts (or corresponding)
                     # We know they are generated files
-                    my $def = cleanfile($buildd, $s, $blddir);
-                    $unified_info{shared_sources}->{$ddest}->{$def} = 1;
+                    my $ld = cleanfile($buildd, $s, $blddir);
+                    $unified_info{shared_sources}->{$ddest}->{$ld} = 1;
                 } else {
                     die "unrecognised source file type for shared library: $s\n";
                 }
@@ -2189,7 +2191,7 @@ EOF
         }
     }
 
-    # Go through all object files and change their names to something that
+    # Go through all intermediary files and change their names to something that
     # reflects what they will be built for.  Note that for some source files,
     # this leads to duplicate object files because they are used multiple times.
     # the goal is to rename all object files according to this scheme:
@@ -2246,8 +2248,9 @@ EOF
                         map { keys %{$unified_copy{$_}->{$prod}} }
                         @src;
                     foreach (keys %prod_sources) {
-                        # Only affect object or resource files, the others
-                        # simply get a new value (+1 instead of -1)
+                        # Only affect object files and resource files,
+                        # the others simply get a new value
+                        # (+1 instead of -1)
                         if ($_ =~ /\.(o|res)$/) {
                             (my $prodname = $prod) =~ s|\.a$||;
                             my $newobj =