build.info: Make it possible to use compiled programs as generators

Our goal is to be able to produce fipsmodule.cnf with the help of
'openssl fipsinstall', using the openssl program that we build.

This refactors the generatesrc code in all the build file templates to
replace $generator and $generator_incs with $gen0, $gen_args and $gen_incs,
which makes it easier and more consistent to manipulate different bits
of the generator command, and also keeps the variable names consistent
while not overly long.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14320)

4 files changed, 251 insertions, 118 deletions

diff --git a/Configurations/descrip.mms.tmpl b/Configurations/descrip.mms.tmpl
index abc344594d..64ccc7a6c8 100644
--- a/Configurations/descrip.mms.tmpl
+++ b/Configurations/descrip.mms.tmpl
@@ -805,19 +805,27 @@ EOF
 
   sub generatesrc {
       my %args = @_;
-      my $generator = join(" ", @{$args{generator}});
-      my $generator_incs = join("", map { ' "-I'.$_.'"' } @{$args{generator_incs}});
+      my $gen0 = $args{generator}->[0];
+      my $gen_args = join('', map { " $_" }
+                              @{$args{generator}}[1..$#{$args{generator}}]);
+      my $gen_incs = join("", map { ' "-I'.$_.'"' } @{$args{generator_incs}});
       my $deps = join(", -\n\t\t", @{$args{generator_deps}}, @{$args{deps}});
 
       if ($args{src} =~ /\.html$/) {
-	  my $title = basename($args{src}, ".html");
-	  my $pod = $args{generator}->[0];
-	  my $mkpod2html = sourcefile('util', 'mkpod2html.pl');
-	  return <<"EOF";
+          #
+          # HTML generator
+          #
+          my $title = basename($args{src}, ".html");
+          my $pod = $gen0;
+          my $mkpod2html = sourcefile('util', 'mkpod2html.pl');
+          return <<"EOF";
 $args{src}: $pod
 	\$(PERL) $mkpod2html -i $pod -o \$\@ -t "$title" -r "\$(SRCDIR)/doc"
 EOF
       } elsif (platform->isdef($args{src})) {
+          #
+          # Linker script-ish generator
+          #
           my $target = platform->def($args{src});
           my $mkdef = sourcefile('util', 'mkdef.pl');
           my $ord_ver = $args{intent} eq 'lib' ? ' --version $(VERSION)' : '';
@@ -827,31 +835,13 @@ EOF
               $target{$args{intent}.'_cflags'} =~ m|/NAMES=[^/]*AS_IS|i
               ? '' : ' --case-insensitive';
           return <<"EOF";
-$target : $args{generator}->[0] $deps $mkdef
-	\$(PERL) $mkdef$ord_ver --ordinals $args{generator}->[0] --name $ord_name "--OS" "VMS"$case_insensitive > $target
-EOF
-      } elsif (!platform->isasm($args{src})) {
-          my $target = $args{src};
-          if ($args{generator}->[0] =~ m|^.*\.in$|) {
-	      my $dofile = abs2rel(rel2abs(catfile($config{sourcedir},
-                                                   "util", "dofile.pl")),
-                                   rel2abs($config{builddir}));
-              my @modules = ( 'configdata.pm',
-                              grep { $_ =~ m|\.pm$| } @{$args{deps}} );
-              my %moduleincs = map { '"-I'.dirname($_).'"' => 1 } @modules;
-              @modules = map { '"-M'.basename($_, '.pm').'"' } @modules;
-              my $modules = join(' ', '', sort keys %moduleincs, @modules);
-              return <<"EOF";
-$target : $args{generator}->[0] $deps
-	\$(PERL)$modules $dofile "-o$target{build_file}" $generator > \$\@
+$target : $gen0 $deps $mkdef
+	\$(PERL) $mkdef$ord_ver --ordinals $gen0 --name $ord_name "--OS" "VMS"$case_insensitive > $target
 EOF
-	  } else {
-              return <<"EOF";
-$target : $args{generator}->[0] $deps
-	\$(PERL)$generator_incs $generator > \$\@
-EOF
-	  }
-      } else {
+      } elsif (platform->isasm($args{src})) {
+          #
+          # Assembler generator
+          #
           my $cppflags = {
               shlib => '$(LIB_CFLAGS) $(LIB_CPPFLAGS)',
               lib => '$(LIB_CFLAGS) $(LIB_CPPFLAGS)',
@@ -870,13 +860,14 @@ EOF
           my $defs = join("", map { ",".$_ } @{$args{defs}});
           my $target = platform->asm($args{src});
 
-          if ($args{generator}->[0] =~ /\.pl$/) {
-              $generator = '$(PERL)'.$generator_incs.' '.$generator
+          my $generator;
+          if ($gen0 =~ /\.pl$/) {
+              $generator = '$(PERL)'.$gen_incs.' '.$gen0.$gen_args
                   .' '.$cppflags;
-          } elsif ($args{generator}->[0] =~ /\.S$/) {
+          } elsif ($gen0 =~ /\.S$/) {
               $generator = undef;
           } else {
-              die "Generator type for $src unknown: $generator\n";
+              die "Generator type for $src unknown: $gen0.$gen_args\n";
           }
 
           if (defined($generator)) {
@@ -884,7 +875,7 @@ EOF
               # end up generating foo.s in two steps.
               if ($args{src} =~ /\.S$/) {
                    return <<"EOF";
-$target : $args{generator}->[0] $deps
+$target : $gen0 $deps
 	$generator \$\@-S
         \@ $incs_on
         \@ extradefines = "$defs"
@@ -898,7 +889,7 @@ EOF
               }
               # Otherwise....
               return <<"EOF";
-$target : $args{generator}->[0] $deps
+$target : $gen0 $deps
         \@ $incs_on
         \@ extradefines = "$defs"
 	$generator \$\@
@@ -907,15 +898,67 @@ $target : $args{generator}->[0] $deps
 EOF
           }
           return <<"EOF";
-$target : $args{generator}->[0] $deps
+$target : $gen0 $deps
         \@ $incs_on
         \@ extradefines = "$defs"
         SHOW SYMBOL qual_includes
-        PIPE \$(CPP) $cppflags $args{generator}->[0] | -
+        PIPE \$(CPP) $cppflags $gen0 | -
         \$(PERL) "-ne" "/^#(\\s*line)?\\s*[0-9]+\\s+""/ or print" > \$\@
         \@ DELETE/SYMBOL/LOCAL extradefines
         \@ $incs_off
 EOF
+      } elsif ($gen0 =~ m|^.*\.in$|) {
+          #
+          # "dofile" generator (file.in -> file)
+          #
+          my $dofile = abs2rel(rel2abs(catfile($config{sourcedir},
+                                               "util", "dofile.pl")),
+                               rel2abs($config{builddir}));
+          my @modules = ( 'configdata.pm',
+                          grep { $_ =~ m|\.pm$| } @{$args{deps}} );
+          my %moduleincs = map { '"-I'.dirname($_).'"' => 1 } @modules;
+          $deps = join(' ', $deps, @modules);
+          @modules = map { '"-M'.basename($_, '.pm').'"' } @modules;
+          my $modules = join(' ', '', sort keys %moduleincs, @modules);
+          return <<"EOF";
+$target : $gen0 $deps
+	\$(PERL)$modules $dofile "-o$target{build_file}" $gen0$gen_args > \$\@
+EOF
+      } elsif (grep { $_ eq $gen0 } @{$unified_info{programs}}) {
+          #
+          # Generic generator using OpenSSL programs
+          #
+
+          # Redo $deps, because programs aren't expected to have deps of their
+          # own.  This is a little more tricky, though, because running programs
+          # may have dependencies on all sorts of files, so we search through
+          # our database of programs and modules to see if our dependencies
+          # are one of those.
+          $deps = join(' ', map { my $x = $_;
+                                  if (grep { $x eq $_ }
+                                          @{$unified_info{programs}}) {
+                                      platform->bin($x);
+                                  } elsif (grep { $x eq $_ }
+                                          @{$unified_info{modules}}) {
+                                      platform->dso($x);
+                                  } else {
+                                      $x;
+                                  }
+                                } @{$args{deps}});
+          # Also redo $gen0, to ensure that we have the proper extension
+          $gen0 = platform->bin($gen0);
+          return <<"EOF";
+$args{src}: $gen0 $deps
+	PIPE $gen0$gen_args > \$@
+EOF
+      } else {
+          #
+          # Generic generator using Perl
+          #
+          return <<"EOF";
+$target : $gen0 $deps
+	\$(PERL)$gen_incs $gen0$gen_args > \$\@
+EOF
       }
   }
 
diff --git a/Configurations/unix-Makefile.tmpl b/Configurations/unix-Makefile.tmpl
index 610a6f6557..f0095d9fd6 100644
--- a/Configurations/unix-Makefile.tmpl
+++ b/Configurations/unix-Makefile.tmpl
@@ -1315,58 +1315,52 @@ EOF
 
   sub generatesrc {
       my %args = @_;
-      my $generator = join(" ", @{$args{generator}});
-      my $generator_incs = join("", map { " -I".$_ } @{$args{generator_incs}});
+      my $gen0 = $args{generator}->[0];
+      my $gen_args = join('', map { " $_" }
+                              @{$args{generator}}[1..$#{$args{generator}}]);
+      my $gen_incs = join("", map { " -I".$_ } @{$args{generator_incs}});
       my $incs = join("", map { " -I".$_ } @{$args{incs}});
       my $defs = join("", map { " -D".$_ } @{$args{defs}});
       my $deps = join(" ", @{$args{generator_deps}}, @{$args{deps}});
 
       if ($args{src} =~ /\.html$/) {
-	  my $title = basename($args{src}, ".html");
-	  my $pod = $args{generator}->[0];
-	  return <<"EOF";
+          #
+          # HTML generator
+          #
+          my $title = basename($args{src}, ".html");
+          my $pod = $gen0;
+          return <<"EOF";
 $args{src}: $pod
 	\$(PERL) \$(SRCDIR)/util/mkpod2html.pl -i "$pod" -o \$\@ -t "$title" -r "\$(SRCDIR)/doc"
 EOF
       } elsif ($args{src} =~ /\.(\d)$/) {
-	  my $section = $1;
-	  my $name = uc basename($args{src}, ".$section");
-	  my $pod = $args{generator}->[0];
-	  return <<"EOF";
+          #
+          # Man-page generator
+          #
+          my $section = $1;
+          my $name = uc basename($args{src}, ".$section");
+          my $pod = $gen0;
+          return <<"EOF";
 $args{src}: $pod
 	pod2man --name=$name --section=$section --center=OpenSSL \\
 		--release=\$(VERSION) $pod >\$\@
 EOF
       } elsif (platform->isdef($args{src})) {
+          #
+          # Linker script-ish generator
+          #
           my $target = platform->def($args{src});
           (my $mkdef_os = $target{shared_target}) =~ s|-shared$||;
           my $ord_ver = $args{intent} eq 'lib' ? ' --version $(VERSION)' : '';
           my $ord_name = $args{generator}->[1] || $args{product};
           return <<"EOF";
-$target: $args{generator}->[0] $deps \$(SRCDIR)/util/mkdef.pl
-	\$(PERL) \$(SRCDIR)/util/mkdef.pl$ord_ver --ordinals $args{generator}->[0]  --name $ord_name --OS $mkdef_os > $target
-EOF
-      } elsif (!platform->isasm($args{src})) {
-          if ($args{generator}->[0] =~ m|^.*\.in$|) {
-              my $dofile = abs2rel(rel2abs(catfile($config{sourcedir},
-                                                   "util", "dofile.pl")),
-                                   rel2abs($config{builddir}));
-              my @modules = ( 'configdata.pm',
-                              grep { $_ =~ m|\.pm$| } @{$args{deps}} );
-              my %moduleincs = map { '"-I'.dirname($_).'"' => 1 } @modules;
-              @modules = map { "-M".basename($_, '.pm') } @modules;
-              my $modules = join(' ', '', sort keys %moduleincs, @modules);
-              return <<"EOF";
-$args{src}: $args{generator}->[0] $deps \$(BLDDIR)/configdata.pm
-	\$(PERL)$modules "$dofile" "-o$target{build_file}" $generator > \$@
+$target: $gen0 $deps \$(SRCDIR)/util/mkdef.pl
+	\$(PERL) \$(SRCDIR)/util/mkdef.pl$ord_ver --ordinals $gen0  --name $ord_name --OS $mkdef_os > $target
 EOF
-	  } else {
-              return <<"EOF";
-$args{src}: $args{generator}->[0] $deps
-	\$(PERL)$generator_incs $generator > \$@
-EOF
-	  }
-      } else {
+      } elsif (platform->isasm($args{src})) {
+          #
+          # Assembler generator
+          #
           my $cppflags = {
               shlib => '$(LIB_CFLAGS) $(LIB_CPPFLAGS)',
               lib => '$(LIB_CFLAGS) $(LIB_CPPFLAGS)',
@@ -1374,28 +1368,82 @@ EOF
               bin => '$(BIN_CFLAGS) $(BIN_CPPFLAGS)'
           } -> {$args{intent}};
 
-          if ($args{generator}->[0] =~ /\.pl$/) {
-              $generator = 'CC="$(CC)" $(PERL)'.$generator_incs.' '.$generator
+          my $generator;
+          if ($gen0 =~ /\.pl$/) {
+              $generator = 'CC="$(CC)" $(PERL)'.$gen_incs.' '.$gen0.$gen_args
                   .' "$(PERLASM_SCHEME)"'.$incs.' '.$cppflags.$defs.' $(PROCESSOR)';
-          } elsif ($args{generator}->[0] =~ /\.m4$/) {
-              $generator = 'm4 -B 8192'.$generator_incs.' '.$generator.' >'
-          } elsif ($args{generator}->[0] =~ /\.S$/) {
+          } elsif ($gen0 =~ /\.m4$/) {
+              $generator = 'm4 -B 8192'.$gen_incs.' '.$gen0.$gen_args.' >'
+          } elsif ($gen0 =~ /\.S$/) {
               $generator = undef;
           } else {
-              die "Generator type for $args{src} unknown: $generator\n";
+              die "Generator type for $args{src} unknown: $gen0\n";
           }
 
           if (defined($generator)) {
               return <<"EOF";
-$args{src}: $args{generator}->[0] $deps
+$args{src}: $gen0 $deps
 	$generator \$@
 EOF
           }
           return <<"EOF";
-$args{src}: $args{generator}->[0] $deps
-	\$(CC) $incs $cppflags $defs -E $args{generator}->[0] | \\
+$args{src}: $gen0 $deps
+	\$(CC) $incs $cppflags $defs -E $gen0 | \\
 	\$(PERL) -ne '/^#(line)?\\s*[0-9]+/ or print' > \$@
 EOF
+      } elsif ($gen0 =~ m|^.*\.in$|) {
+          #
+          # "dofile" generator (file.in -> file)
+          #
+          my $dofile = abs2rel(rel2abs(catfile($config{sourcedir},
+                                               "util", "dofile.pl")),
+                               rel2abs($config{builddir}));
+          my @modules = ( 'configdata.pm',
+                          grep { $_ =~ m|\.pm$| } @{$args{deps}} );
+          my %moduleincs = map { '"-I'.dirname($_).'"' => 1 } @modules;
+          $deps = join(' ', $deps, @modules);
+          @modules = map { "-M".basename($_, '.pm') } @modules;
+          my $modules = join(' ', '', sort keys %moduleincs, @modules);
+          return <<"EOF";
+$args{src}: $gen0 $deps
+	\$(PERL)$modules "$dofile" "-o$target{build_file}" $gen0$gen_args > \$@
+EOF
+      } elsif (grep { $_ eq $gen0 } @{$unified_info{programs}}) {
+          #
+          # Generic generator using OpenSSL programs
+          #
+
+          # Redo $deps, because programs aren't expected to have deps of their
+          # own.  This is a little more tricky, though, because running programs
+          # may have dependencies on all sorts of files, so we search through
+          # our database of programs and modules to see if our dependencies
+          # are one of those.
+          $deps = join(' ', map { my $x = $_;
+                                  if (grep { $x eq $_ }
+                                          @{$unified_info{programs}}) {
+                                      platform->bin($x);
+                                  } elsif (grep { $x eq $_ }
+                                          @{$unified_info{modules}}) {
+                                      platform->dso($x);
+                                  } else {
+                                      $x;
+                                  }
+                                } @{$args{deps}});
+          # Also redo $gen0, to ensure that we have the proper extension where
+          # necessary.
+          $gen0 = platform->bin($gen0);
+          return <<"EOF";
+$args{src}: $gen0 $deps \$(BLDDIR)/util/wrap.pl
+	\$(BLDDIR)/util/wrap.pl $gen0$gen_args > \$@
+EOF
+      } else {
+          #
+          # Generic generator using Perl
+          #
+          return <<"EOF";
+$args{src}: $gen0 $deps
+	\$(PERL)$gen_incs $gen0$gen_args > \$@
+EOF
       }
   }
 
diff --git a/Configurations/windows-makefile.tmpl b/Configurations/windows-makefile.tmpl
index f19efba7d1..e9b284d501 100644
--- a/Configurations/windows-makefile.tmpl
+++ b/Configurations/windows-makefile.tmpl
@@ -637,22 +637,29 @@ EOF
 
   sub generatesrc {
       my %args = @_;
-      my ($gen0, @gens) = @{$args{generator}};
-      my $generator = '"'.$gen0.'"'.join('', map { " $_" } @gens);
-      my $generator_incs = join("", map { " -I \"$_\"" } @{$args{generator_incs}});
+      my $gen0 = $args{generator}->[0];
+      my $gen_args = join('', map { " $_" }
+                              @{$args{generator}}[1..$#{$args{generator}}]);
+      my $gen_incs = join("", map { " -I \"$_\"" } @{$args{generator_incs}});
       my $incs = join("", map { " -I \"$_\"" } @{$args{incs}});
       my $defs = join("", map { " -D".$_ } @{$args{defs}});
       my $deps = @{$args{deps}} ?
           '"'.join('" "', @{$args{generator_deps}}, @{$args{deps}}).'"' : '';
 
       if ($args{src} =~ /\.html$/) {
-	  my $title = basename($args{src}, ".html");
-	  my $pod = $args{generator}->[0];
-	  return <<"EOF";
+          #
+          # HTML generator
+          #
+          my $title = basename($args{src}, ".html");
+          my $pod = $gen0;
+          return <<"EOF";
 $args{src}: "$pod"
 	\$(PERL) \$(SRCDIR)/util/mkpod2html.pl -i "$pod" -o \$\@ -t "$title" -r "\$(SRCDIR)/doc"
 EOF
       } elsif (platform->isdef($args{src})) {
+          #
+          # Linker script-ish generator
+          #
           my $target = platform->def($args{src});
           my $mkdef = abs2rel(rel2abs(catfile($config{sourcedir},
                                               "util", "mkdef.pl")),
@@ -661,31 +668,13 @@ EOF
           my $ord_name =
               $args{generator}->[1] || platform->dsoname($args{product});
           return <<"EOF";
-$target: $args{generator}->[0] $deps $mkdef
-	"\$(PERL)" $mkdef$ord_ver --ordinals $args{generator}->[0] --name $ord_name --OS windows > $target
-EOF
-      } elsif (!platform->isasm($args{src})) {
-          my $target = $args{src};
-          if ($args{generator}->[0] =~ m|^.*\.in$|) {
-              my $dofile = abs2rel(rel2abs(catfile($config{sourcedir},
-                                                   "util", "dofile.pl")),
-                                   rel2abs($config{builddir}));
-              my @modules = ( 'configdata.pm',
-                              grep { $_ =~ m|\.pm$| } @{$args{deps}} );
-              my %moduleincs = map { '"-I'.dirname($_).'"' => 1 } @modules;
-              @modules = map { "-M".basename($_, '.pm') } @modules;
-              my $modules = join(' ', '', sort keys %moduleincs, @modules);
-              return <<"EOF";
-$target: "$args{generator}->[0]" $deps
-	"\$(PERL)"$modules "$dofile" "-o$target{build_file}" $generator > \$@
+$target: $gen0 $deps $mkdef
+	"\$(PERL)" $mkdef$ord_ver --ordinals $gen0 --name $ord_name --OS windows > $target
 EOF
-	  } else {
-              return <<"EOF";
-$target: "$args{generator}->[0]" $deps
-	"\$(PERL)"$generator_incs $generator > \$@
-EOF
-	  }
-      } else {
+      } elsif (platform->isasm($args{src})) {
+          #
+          # Assembler generator
+          #
           my $cppflags = {
               shlib => '$(LIB_CFLAGS) $(LIB_CPPFLAGS)',
               lib => '$(LIB_CFLAGS) $(LIB_CPPFLAGS)',
@@ -694,13 +683,14 @@ EOF
           } -> {$args{intent}};
           my $target = platform->asm($args{src});
 
-          if ($args{generator}->[0] =~ /\.pl$/) {
-              $generator = '"$(PERL)"'.$generator_incs.' '.$generator
+          my $generator;
+          if ($gen0 =~ /\.pl$/) {
+              $generator = '"$(PERL)"'.$gen_incs.' '.$gen0.$gen_args
                   .' "$(PERLASM_SCHEME)"'.$incs.' '.$cppflags.$defs.' $(PROCESSSOR)';
-          } elsif ($args{generator}->[0] =~ /\.S$/) {
+          } elsif ($gen0 =~ /\.S$/) {
               $generator = undef;
           } else {
-              die "Generator type for $src unknown: $generator\n";
+              die "Generator type for $src unknown: $gen0\n";
           }
 
           if (defined($generator)) {
@@ -708,7 +698,7 @@ EOF
               # end up generating foo.s in two steps.
               if ($args{src} =~ /\.S$/) {
                    return <<"EOF";
-$target: "$args{generator}->[0]" $deps
+$target: "$gen0" $deps
 	set ASM=\$(AS)
 	$generator \$@.S
 	\$(CPP) $incs $cppflags $defs \$@.S > \$@.i && move /Y \$@.i \$@
@@ -717,14 +707,66 @@ EOF
               }
               # Otherwise....
               return <<"EOF";
-$target: "$args{generator}->[0]" $deps
+$target: "$gen0" $deps
 	set ASM=\$(AS)
 	$generator \$@
 EOF
           }
           return <<"EOF";
-$target: "$args{generator}->[0]" $deps
-	\$(CPP) $incs $cppflags $defs "$args{generator}->[0]" > \$@.i && move /Y \$@.i \$@
+$target: "$gen0" $deps
+	\$(CPP) $incs $cppflags $defs "$gen0" > \$@.i && move /Y \$@.i \$@
+EOF
+      } elsif ($gen0 =~ m|^.*\.in$|) {
+          #
+          # "dofile" generator (file.in -> file)
+          #
+          my $dofile = abs2rel(rel2abs(catfile($config{sourcedir},
+                                               "util", "dofile.pl")),
+                               rel2abs($config{builddir}));
+          my @modules = ( 'configdata.pm',
+                          grep { $_ =~ m|\.pm$| } @{$args{deps}} );
+          my %moduleincs = map { '"-I'.dirname($_).'"' => 1 } @modules;
+          $deps = join(' ', $deps, @modules);
+          @modules = map { "-M".basename($_, '.pm') } @modules;
+          my $modules = join(' ', '', sort keys %moduleincs, @modules);
+          return <<"EOF";
+$args{src}: "$gen0" $deps
+	"\$(PERL)"$modules "$dofile" "-o$target{build_file}" "$gen0"$gen_args > \$@
+EOF
+      } elsif (grep { $_ eq $gen0 } @{$unified_info{programs}}) {
+          #
+          # Generic generator using OpenSSL programs
+          #
+
+          # Redo $deps, because programs aren't expected to have deps of their
+          # own.  This is a little more tricky, though, because running programs
+          # may have dependencies on all sorts of files, so we search through
+          # our database of programs and modules to see if our dependencies
+          # are one of those.
+          $deps = join(' ', map { my $x = $_;
+                                  if (grep { $x eq $_ }
+                                          @{$unified_info{programs}}) {
+                                      platform->bin($x);
+                                  } elsif (grep { $x eq $_ }
+                                          @{$unified_info{modules}}) {
+                                      platform->dso($x);
+                                  } else {
+                                      $x;
+                                  }
+                                } @{$args{deps}});
+          # Also redo $gen0, to ensure that we have the proper extension.
+          $gen0 = platform->bin($gen0);
+          return <<"EOF";
+$args{src}: $gen0 $deps
+	$gen0$gen_args > \$@
+EOF
+      } else {
+          #
+          # Generic generator using Perl
+          #
+          return <<"EOF";
+$args{src}: "$gen0" $deps
+	"\$(PERL)"$gen_incs $gen0$gen_args > \$@
 EOF
       }
   }
diff --git a/Configure b/Configure
index e24564311e..5f2be9cf3c 100755
--- a/Configure
+++ b/Configure
@@ -2320,7 +2320,7 @@ EOF
             $generator[0] = cleanfile($sourced, $gen, $blddir);
 
             # If the generator is itself generated, it's in the build tree
-            if ($generate{$gen}) {
+            if ($generate{$gen} || ! -f $generator[0]) {
                 $generator[0] = cleanfile($buildd, $gen, $blddir);
             }
             $check_generate{$ddest}->{$generator[0]}++;