kbuild: optimize headers_* targets

[safe/jmp/linux-2.6] / scripts / headers_install.pl

diff --git a/scripts/headers_install.pl b/scripts/headers_install.pl
new file mode 100644 (file)
index 0000000..f0ff9a3
--- /dev/null
+++ b/scripts/headers_install.pl
@@ -0,0 +1,42 @@
+#!/usr/bin/perl
+#
+# headers_install prepare the listed header files for use in
+# user space and copy the files to their destination.
+#
+# Usage: headers_install.pl odir installdir [files...]
+# odir:    dir to open files
+# install: dir to install the files
+# files:   list of files to check
+#
+# Step in preparation for users space:
+# 1) Drop all use of compiler.h definitions
+# 2) Drop include of compiler.h
+# 3) Drop all sections defined out by __KERNEL__ (using unifdef)
+
+use strict;
+use warnings;
+
+my ($readdir, $installdir, @files) = @ARGV;
+
+my $unifdef = "scripts/unifdef -U__KERNEL__";
+
+foreach my $file (@files) {
+       my $tmpfile = "$installdir/$file.tmp";
+       open(my $infile, '<', "$readdir/$file")
+               or die "$readdir/$file: $!\n";
+       open(my $outfile, '>', "$tmpfile") or die "$tmpfile: $!\n";
+       while (my $line = <$infile>) {
+               $line =~ s/([\s(])__user\s/$1/g;
+               $line =~ s/([\s(])__force\s/$1/g;
+               $line =~ s/([\s(])__iomem\s/$1/g;
+               $line =~ s/\s__attribute_const__\s/ /g;
+               $line =~ s/\s__attribute_const__$//g;
+               $line =~ s/^#include <linux\/compiler.h>//;
+               printf $outfile "%s", $line;
+       }
+       close $outfile;
+       close $infile;
+       system $unifdef . " $tmpfile > $installdir/$file";
+       unlink $tmpfile;
+}
+exit 0;