Build files: Unify standard arguments for assembler generating scrips

- Make the last argument always be the output file.
- Make the first argument always be the flavour, even if there is no
  flavour (i.e. it might become the empty string).
- Make the next to last argument to be $(PROCESSOR) if that one has a
  value.
- Remaining arguments are C prepropressor arguments.

Perl scripts that should handle this may use the following code:

    $output = pop;
    $flavour = shift;
    if ($ARGV[$#ARGV] eq '386') {
        # Do 386 specific things
    } else {
        # Do whatever else, with the knowledge the @ARGV contains
        # C preprocessor arguments
    }

Some scripts don't care about anything than $output, and that's ok.
Some scripts do care, but handle it a little differently, and that's
ok too (notably, the x86 scripts call asm_init() with the first and
the last argument after having popped $output).
As long as they handle the argument order right, they are going to
be fine.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/9884)

Configurations/descrip.mms.tmpl

@@ -787,15 +787,6 @@ $target : $args{generator}->[0] $deps
 EOF
 	  }
       } else {
-          my $target = platform->asm($args{src});
-          if ($args{generator}->[0] =~ /\.pl$/) {
-              $generator = '$(PERL)'.$generator_incs.' '.$generator;
-          } elsif ($args{generator}->[0] =~ /\.S$/) {
-              $generator = undef;
-          } else {
-              die "Generator type for $src unknown: $generator\n";
-          }
-
           my $cppflags = {
               shlib => '$(LIB_CFLAGS) $(LIB_CPPFLAGS)',
               lib => '$(LIB_CFLAGS) $(LIB_CPPFLAGS)',
@@ -812,6 +803,17 @@ EOF
           my $incs_on = join("\n\t\@ ", @{$incs_cmds[0]}) || '!';
           my $incs_off = join("\n\t\@ ", @{$incs_cmds[1]}) || '!';
           my $defs = join("", map { ",".$_ } @{$args{defs}});
+          my $target = platform->asm($args{src});
+
+          if ($args{generator}->[0] =~ /\.pl$/) {
+              $generator = '$(PERL)'.$generator_incs.' '.$generator
+                  .' '.$cppflags;
+          } elsif ($args{generator}->[0] =~ /\.S$/) {
+              $generator = undef;
+          } else {
+              die "Generator type for $src unknown: $generator\n";
+          }
+
           if (defined($generator)) {
               # If the target is named foo.S in build.info, we want to
               # end up generating foo.s in two steps.
@@ -832,7 +834,11 @@ EOF
               # Otherwise....
               return <<"EOF";
 $target : $args{generator}->[0] $deps
+        \@ $incs_on
+        \@ extradefines = "$defs"
 	$generator \$\@
+        \@ DELETE/SYMBOL/LOCAL extradefines
+        \@ $incs_off
 EOF
           }
           return <<"EOF";

Configurations/unix-Makefile.tmpl

@@ -980,8 +980,16 @@ $args{src}: $args{generator}->[0] $deps
 EOF
 	  }
       } else {
+          my $cppflags = {
+              shlib => '$(LIB_CFLAGS) $(LIB_CPPFLAGS)',
+              lib => '$(LIB_CFLAGS) $(LIB_CPPFLAGS)',
+              dso => '$(DSO_CFLAGS) $(DSO_CPPFLAGS)',
+              bin => '$(BIN_CFLAGS) $(BIN_CPPFLAGS)'
+          } -> {$args{intent}};
+
           if ($args{generator}->[0] =~ /\.pl$/) {
-              $generator = 'CC="$(CC)" $(PERL)'.$generator_incs.' '.$generator;
+              $generator = 'CC="$(CC)" $(PERL)'.$generator_incs.' '.$generator
+                  .' "$(PERLASM_SCHEME)"'.$incs.' '.$cppflags.$defs.' $(PROCESSSOR)';
           } elsif ($args{generator}->[0] =~ /\.m4$/) {
               $generator = 'm4 -B 8192'.$generator_incs.' '.$generator.' >'
           } elsif ($args{generator}->[0] =~ /\.S$/) {
@@ -990,12 +998,6 @@ EOF
               die "Generator type for $args{src} unknown: $generator\n";
           }
 
-          my $cppflags = {
-              shlib => '$(LIB_CFLAGS) $(LIB_CPPFLAGS)',
-              lib => '$(LIB_CFLAGS) $(LIB_CPPFLAGS)',
-              dso => '$(DSO_CFLAGS) $(DSO_CPPFLAGS)',
-              bin => '$(BIN_CFLAGS) $(BIN_CPPFLAGS)'
-          } -> {$args{intent}};
           if (defined($generator)) {
               return <<"EOF";
 $args{src}: $args{generator}->[0] $deps

Configurations/windows-makefile.tmpl

@@ -570,22 +570,23 @@ $target: "$args{generator}->[0]" $deps
 EOF
 	  }
       } else {
+          my $cppflags = {
+              shlib => '$(LIB_CFLAGS) $(LIB_CPPFLAGS)',
+              lib => '$(LIB_CFLAGS) $(LIB_CPPFLAGS)',
+              dso => '$(DSO_CFLAGS) $(DSO_CPPFLAGS)',
+              bin => '$(BIN_CFLAGS) $(BIN_CPPFLAGS)'
+          } -> {$args{intent}};
           my $target = platform->asm($args{src});
+
           if ($args{generator}->[0] =~ /\.pl$/) {
-              $generator = '"$(PERL)"'.$generator_incs.' '.$generator;
+              $generator = '"$(PERL)"'.$generator_incs.' '.$generator
+                  .' "$(PERLASM_SCHEME)"'.$incs.' '.$cppflags.$defs.' $(PROCESSSOR)';
           } elsif ($args{generator}->[0] =~ /\.S$/) {
               $generator = undef;
           } else {
               die "Generator type for $src unknown: $generator\n";
           }
 
-          my $cppflags = $incs;
-          $cppflags .= {
-              shlib => ' $(LIB_CFLAGS) $(LIB_CPPFLAGS)',
-              lib => ' $(LIB_CFLAGS) $(LIB_CPPFLAGS)',
-              dso => ' $(DSO_CFLAGS) $(DSO_CPPFLAGS)',
-              bin => ' $(BIN_CFLAGS) $(BIN_CPPFLAGS)'
-          } -> {$args{intent}};
           if (defined($generator)) {
               # If the target is named foo.S in build.info, we want to
               # end up generating foo.s in two steps.
@@ -594,7 +595,7 @@ EOF
 $target: "$args{generator}->[0]" $deps
 	set ASM=\$(AS)
 	$generator \$@.S
-	\$(CPP) $cppflags $defs \$@.S > \$@.i && move /Y \$@.i \$@
+	\$(CPP) $incs $cppflags $defs \$@.S > \$@.i && move /Y \$@.i \$@
         del /Q \$@.S
 EOF
               }