Make it possible to build static-only libraries

The trick is to use the .a extension explicitely in the build.info files.
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3243)

Configurations/common.tmpl

@@ -18,7 +18,8 @@
      my $thing = shift;
      my $extensionlessthing = extensionlesslib($thing);
      my @listsofar = @_;    # to check if we're looping
-     my @list = @{$unified_info{depends}->{$extensionlessthing}};
+     my @list = @{$unified_info{depends}->{$thing} //
+                      $unified_info{depends}->{$extensionlessthing}};
      my @newlist = ();
      if (scalar @list) {
          foreach my $item (@list) {
@@ -33,13 +34,22 @@
  sub reducedepends {
      my @list = @_;
      my @newlist = ();
+     my %replace = ();
      while (@list) {
          my $item = shift @list;
          my $extensionlessitem = extensionlesslib($item);
-         push @newlist, $item
-             unless grep { $extensionlessitem eq extensionlesslib($_) } @list;
+         if (grep { $extensionlessitem eq extensionlesslib($_) } @list) {
+             if ($item ne $extensionlessitem) {
+                 # If this instance of the library is explicitely static, we
+                 # prefer that to any shared library name, since it must have
+                 # been done on purpose.
+                 $replace{$extensionlessitem} = $item;
+             }
+         } else {
+             push @newlist, $item;
+         }
      }
-     @newlist;
+     map { $replace{$_} // $_; } @newlist;
  }
 
  # is_installed checks if a given file will be installed (i.e. they are
@@ -113,7 +123,7 @@
  sub dolib {
      my $lib = shift;
      return "" if $cache{$lib};
-     unless ($disabled{shared}) {
+     unless ($disabled{shared} || $lib =~ /\.a$/) {
          my %ordinals =
              $unified_info{ordinals}->{$lib}
              ? (ordinals => $unified_info{ordinals}->{$lib}) : ();

Configurations/descrip.mms.tmpl

@@ -42,8 +42,18 @@
 
   # Because we need to make two computations of these data,
   # we store them in arrays for reuse
-  our @shlibs = map { $unified_info{sharednames}->{$_} || () } @{$unified_info{libraries}};
-  our @install_shlibs = map { $unified_info{sharednames}->{$_} || () } @{$unified_info{install}->{libraries}};
+  our @libs =
+      map { (my $x = $_) =~ s/\.a$//; $x }
+      @{$unified_info{libraries}};
+  our @shlibs =
+      map { $unified_info{sharednames}->{$_} || () }
+      grep(!/\.a$/, @{$unified_info{libraries}});
+  our @install_libs =
+      map { (my $x = $_) =~ s/\.a$//; $x }
+      @{$unified_info{install}->{libraries}};
+  our @install_shlibs =
+      map { $unified_info{sharednames}->{$_} || () }
+      grep(!/\.a$/, @{$unified_info{install}->{libraries}});
   our @generated = ( ( map { (my $x = $_) =~ s|\.S$|\.s|; $x }
                        grep { defined $unified_info{generate}->{$_} }
                        map { @{$unified_info{sources}->{$_}} }
@@ -113,7 +123,7 @@ SHLIB_EXT=.EXE
 OBJ_EXT=.OBJ
 DEP_EXT=.D
 
-LIBS={- join(", ", map { "-\n\t".$_.".OLB" } @{$unified_info{libraries}}) -}
+LIBS={- join(", ", map { "-\n\t".$_.".OLB" } @libs) -}
 SHLIBS={- join(", ", map { "-\n\t".$_.".EXE" } @shlibs) -}
 ENGINES={- join(", ", map { "-\n\t".$_.".EXE" } @{$unified_info{engines}}) -}
 PROGRAMS={- join(", ", map { "-\n\t".$_.".EXE" } @{$unified_info{programs}}) -}
@@ -127,7 +137,7 @@ DEPS={- our @deps = map { (my $x = $_) =~ s|\.o$|\$(DEP_EXT)|; $x; }
 GENERATED_MANDATORY={- join(", ", map { "-\n\t".$_ } @{$unified_info{depends}->{""}} ) -}
 GENERATED={- join(", ", map { "-\n\t".$_ } @generated) -}
 
-INSTALL_LIBS={- join(", ", map { "-\n\t".$_.".OLB" } @{$unified_info{install}->{libraries}}) -}
+INSTALL_LIBS={- join(", ", map { "-\n\t".$_.".OLB" } @install_libs) -}
 INSTALL_SHLIBS={- join(", ", map { "-\n\t".$_.".EXE" } @install_shlibs) -}
 INSTALL_ENGINES={- join(", ", map { "-\n\t".$_.".EXE" } @{$unified_info{install}->{engines}}) -}
 INSTALL_PROGRAMS={- join(", ", map { "-\n\t".$_.".EXE" } @{$unified_info{install}->{programs}}) -}
@@ -230,10 +240,10 @@ NODEBUG=@
         $(NODEBUG) ! Set up logical names for the libraries, so LINK and
         $(NODEBUG) ! running programs can use them.
         $(NODEBUG) !
-        $(NODEBUG) {- join("\n\t\$(NODEBUG) ", map { "DEFINE ".uc($_)." 'F\$ENV(\"DEFAULT\")'".uc($_)."\$(SHLIB_EXT)" } map { $unified_info{sharednames}->{$_} || () } @{$unified_info{libraries}}) || "!" -}
+        $(NODEBUG) {- join("\n\t\$(NODEBUG) ", map { "DEFINE ".uc($_)." 'F\$ENV(\"DEFAULT\")'".uc($_)."\$(SHLIB_EXT)" } @shlibs) || "!" -}
 
 .LAST :
-        $(NODEBUG) {- join("\n\t\$(NODEBUG) ", map { "DEASSIGN ".uc($_) } map { $unified_info{sharednames}->{$_} || () } @{$unified_info{libraries}}) || "!" -}
+        $(NODEBUG) {- join("\n\t\$(NODEBUG) ", map { "DEASSIGN ".uc($_) } @shlibs) || "!" -}
         $(NODEBUG) DEASSIGN ossl_dataroot
         $(NODEBUG) DEASSIGN ossl_installroot
         $(NODEBUG) DEASSIGN internal
@@ -317,7 +327,7 @@ uninstall : uninstall_docs uninstall_sw
 # Because VMS wants the generation number (or *) to delete files, we can't
 # use $(LIBS), $(PROGRAMS), $(GENERATED) and $(ENGINES)directly.
 libclean :
-        {- join("\n\t", map { "- DELETE $_.OLB;*" } @{$unified_info{libraries}}) || "@ !" -}
+        {- join("\n\t", map { "- DELETE $_.OLB;*" } @libs) || "@ !" -}
         {- join("\n\t", map { "- DELETE $_.EXE;*,$_.MAP;*,$_.OPT;*" } @shlibs) || "@ !" -}
 
 clean : libclean
@@ -407,7 +417,7 @@ _install_dev_ns : check_INSTALLTOP
         - CREATE/DIR ossl_installroot:[LIB.'arch']
         {- join("\n        ",
                 map { "COPY/PROT=W:R $_.OLB ossl_installroot:[LIB.'arch']" }
-                @{$unified_info{install}->{libraries}}) -}
+                @install_libs) -}
 
 install_dev : install_shared _install_dev_ns
 
@@ -729,7 +739,7 @@ EOF
   }
   sub obj2lib {
       my %args = @_;
-      my $lib = $args{lib};
+      (my $lib = $args{lib}) =~ s/\.a$//;
       my $objs = join(", -\n\t\t", map { $_.".OBJ" } (@{$args{objs}}));
       my $fill_lib = join("\n\t", (map { "LIBRARY/REPLACE $lib.OLB $_.OBJ" }
                                     @{$args{objs}}));

Configurations/unix-Makefile.tmpl

@@ -38,20 +38,26 @@
      # removed.  On some systems, they may therefore return the exact same
      # string.
      sub shlib {
-         return () if $disabled{shared};
          my $lib = shift;
+         return () if $disabled{shared} || $lib =~ /\.a$/;
          return $unified_info{sharednames}->{$lib} . $shlibext;
      }
      sub shlib_simple {
-         return () if $disabled{shared};
-
          my $lib = shift;
+         return () if $disabled{shared} || $lib =~ /\.a$/;
+
          if (windowsdll()) {
              return $lib . $shlibextimport;
          }
          return $lib .  $shlibextsimple;
      }
 
+     # Easy fixing of static library names
+     sub lib {
+         (my $lib = shift) =~ s/\.a$//;
+         return $lib . $libext;
+     }
+
      # dso is a complement to shlib / shlib_simple that returns the
      # given libname with the simple shared extension (possible SO version
      # removed).  This differs from shlib_simple() by being unconditional.
@@ -84,7 +90,7 @@ SHLIB_MAJOR={- $config{shlib_major} -}
 SHLIB_MINOR={- $config{shlib_minor} -}
 SHLIB_TARGET={- $target{shared_target} -}
 
-LIBS={- join(" ", map { $_.$libext } @{$unified_info{libraries}}) -}
+LIBS={- join(" ", map { lib($_) } @{$unified_info{libraries}}) -}
 SHLIBS={- join(" ", map { shlib($_) } @{$unified_info{libraries}}) -}
 SHLIB_INFO={- join(" ", map { "\"".shlib($_).";".shlib_simple($_)."\"" } @{$unified_info{libraries}}) -}
 ENGINES={- join(" ", map { dso($_) } @{$unified_info{engines}}) -}
@@ -103,7 +109,7 @@ GENERATED={- join(" ",
                     grep { /\.o$/ } keys %{$unified_info{sources}} ),
                   ( grep { /\.h$/ } keys %{$unified_info{generate}} )) -}
 
-INSTALL_LIBS={- join(" ", map { $_.$libext } @{$unified_info{install}->{libraries}}) -}
+INSTALL_LIBS={- join(" ", map { lib($_) } @{$unified_info{install}->{libraries}}) -}
 INSTALL_SHLIBS={- join(" ", map { shlib($_) } @{$unified_info{install}->{libraries}}) -}
 INSTALL_SHLIB_INFO={- join(" ", map { "\"".shlib($_).";".shlib_simple($_)."\"" } @{$unified_info{install}->{libraries}}) -}
 INSTALL_ENGINES={- join(" ", map { dso($_) } @{$unified_info{install}->{engines}}) -}
@@ -769,7 +775,7 @@ configdata.pm: $(SRCDIR)/Configure $(SRCDIR)/config {- join(" ", @{$config{build
   # It takes a list of library names and outputs a list of dependencies
   sub compute_lib_depends {
       if ($disabled{shared}) {
-          return map { $_ =~ /\.a$/ ? $`.$libext : $_.$libext } @_;
+          return map { lib($_) } @_;
       }
 
       # Depending on shared libraries:
@@ -983,7 +989,7 @@ EOF
   }
   sub obj2lib {
       my %args = @_;
-      my $lib = $args{lib};
+      (my $lib = $args{lib}) =~ s/\.a$//;
       my $objs = join(" ", map { $_.$objext } @{$args{objs}});
       return <<"EOF";
 $lib$libext: $objs

Configurations/windows-makefile.tmpl

@@ -31,14 +31,20 @@
  $win_commonroot = $ENV{$win_commonroot};
 
  sub shlib {
-     return () if $disabled{shared};
      my $lib = shift;
+     return () if $disabled{shared} || $lib =~ /\.a$/;
+     return () unless defined $unified_info{sharednames}->{$lib};
      return $unified_info{sharednames}->{$lib} . $shlibext;
  }
 
+ sub lib {
+     (my $lib = shift) =~ s/\.a$//;
+     return $lib . $libext;
+ }
+
  sub shlib_import {
-     return () if $disabled{shared};
      my $lib = shift;
+     return () if $disabled{shared} || $lib =~ /\.a$/;
      return $lib . $shlibextimport;
  }
 
@@ -67,7 +73,7 @@ MINOR={- $config{minor} -}
 
 SHLIB_VERSION_NUMBER={- $config{shlib_version_number} -}
 
-LIBS={- join(" ", map { $_.$libext } @{$unified_info{libraries}}) -}
+LIBS={- join(" ", map { lib($_) } @{$unified_info{libraries}}) -}
 SHLIBS={- join(" ", map { shlib($_) } @{$unified_info{libraries}}) -}
 SHLIBPDBS={- join(" ", map { local $shlibext = ".pdb"; shlib($_) } @{$unified_info{libraries}}) -}
 ENGINES={- join(" ", map { dso($_) } @{$unified_info{engines}}) -}
@@ -88,7 +94,7 @@ GENERATED={- join(" ",
                     grep { /\.o$/ } keys %{$unified_info{sources}} ),
                   ( grep { /\.h$/ } keys %{$unified_info{generate}} )) -}
 
-INSTALL_LIBS={- join(" ", map { $_.$libext } @{$unified_info{install}->{libraries}}) -}
+INSTALL_LIBS={- join(" ", map { lib($_) } @{$unified_info{install}->{libraries}}) -}
 INSTALL_SHLIBS={- join(" ", map { shlib($_) } @{$unified_info{install}->{libraries}}) -}
 INSTALL_SHLIBPDBS={- join(" ", map { local $shlibext = ".pdb"; shlib($_) } @{$unified_info{install}->{libraries}}) -}
 INSTALL_ENGINES={- join(" ", map { dso($_) } @{$unified_info{install}->{engines}}) -}
@@ -352,11 +358,14 @@ configdata.pm: "$(SRCDIR)\Configure" {- join(" ", map { '"'.$_.'"' } @{$config{b
  # It takes a list of library names and outputs a list of dependencies
  sub compute_lib_depends {
      if ($disabled{shared}) {
-	 return map { $_ =~ /\.a$/ ? $`.$libext : $_.$libext } @_;
+	 return map { lib($_) } @_;
      }
-     die "Linking with static OpenSSL libraries is not supported in this configuration\n"
-         if grep /\.a$/, @_;
-     return map { shlib_import($_) } @_;
+     foreach (@_) {
+         (my $l = $_) =~ s/\.a$//;
+         die "Linking with static variants of shared libraries is not supported in this configuration\n"
+             if $l ne $_ && shlib($l);
+     }
+     return map { shlib_import($_) or lib($_) } @_;
  }
 
   sub generatesrc {
@@ -530,13 +539,15 @@ $objs$linklibs \$(EX_LIBS)
 EOF
  }
  sub obj2lib {
+     my %args = @_;
+     my $lib = $args{lib};
+
      # Because static libs and import libs are both named the same in native
      # Windows, we can't have both.  We skip the static lib in that case,
      # as the shared libs are what we use anyway.
-     return "" unless $disabled{"shared"};
+     return "" unless $disabled{"shared"} || $lib =~ /\.a$/;
 
-     my %args = @_;
-     my $lib = $args{lib};
+     $lib =~ s/\.a$//;
      my $objs = join("\n", map { $_.$objext } @{$args{objs}});
      my $deps = join(" ", map { $_.$objext } @{$args{objs}});
      return <<"EOF";

Configure

@@ -1732,12 +1732,24 @@ EOF
             }
 
             # Additionally, we set up sharednames for libraries that don't
-            # have any, as themselves.
-            foreach (keys %{$unified_info{libraries}}) {
+            # have any, as themselves.  Only for libraries that aren't
+            # explicitely static.
+            foreach (grep !/\.a$/, keys %{$unified_info{libraries}}) {
                 if (!defined $unified_info{sharednames}->{$_}) {
                     $unified_info{sharednames}->{$_} = $_
                 }
             }
+
+            # Check that we haven't defined any library as both shared and
+            # explicitely static.  That is forbidden.
+            my @doubles = ();
+            foreach (grep /\.a$/, keys %{$unified_info{libraries}}) {
+                (my $l = $_) =~ s/\.a$//;
+                push @doubles, $l if defined $unified_info{sharednames}->{$l};
+            }
+            die "these libraries are both explicitely static and shared:\n  ",
+                join(" ", @doubles), "\n"
+                if @doubles;
         }
 
         foreach (keys %ordinals) {