=head1 SYNOPSIS
-B<dh_strip> [S<I<debhelper options>>] [B<-X>I<item>]
+B<dh_strip> [S<I<debhelper options>>] [B<-X>I<item>] [B<--dbg-package=>I<package>] [B<--keep-debug>]
=head1 DESCRIPTION
-dh_strip is a debhelper program that is responsible for stripping
+B<dh_strip> is a debhelper program that is responsible for stripping
executables, shared libraries, and static libraries that are not used for
debugging.
This program examines your package build directories and works out what
-to strip on its own. It uses L<file(1)> and file permisions and filenames
-to figure out what files are shared libraries (*.so), executable binaries,
-and static (lib*.a) and debugging libraries (lib*_g.a, debug/*.so), and
+to strip on its own. It uses L<file(1)> and file permissions and filenames
+to figure out what files are shared libraries (F<*.so>), executable binaries,
+and static (F<lib*.a>) and debugging libraries (F<lib*_g.a>, F<debug/*.so>), and
strips each as much as is possible. (Which is not at all for debugging
libraries.) In general it seems to make very good guesses, and will do the
right thing in almost all cases.
Since it is very hard to automatically guess if a file is a
-module, and hard to determine how to strip a module, dh_strip does not
-currently deal with stripping binary modules such as .o files.
+module, and hard to determine how to strip a module, B<dh_strip> does not
+currently deal with stripping binary modules such as F<.o> files.
=head1 OPTIONS
=item B<-X>I<item>, B<--exclude=>I<item>
-Exclude files that contain "item" anywhere in their filename from being
+Exclude files that contain I<item> anywhere in their filename from being
stripped. You may use this option multiple times to build up a list of
things to exclude.
+=item B<--dbg-package=>I<package>
+
+Causes B<dh_strip> to save debug symbols stripped from the packages it acts on
+as independent files in the package build directory of the specified debugging
+package.
+
+For example, if your packages are libfoo and foo and you want to include a
+I<foo-dbg> package with debugging symbols, use B<dh_strip --dbg-package=>I<foo-dbg>.
+
+Note that this option behaves significantly different in debhelper
+compatibility levels 4 and below. Instead of specifying the name of a debug
+package to put symbols in, it specifies a package (or packages) which
+should have separated debug symbols, and the separated symbols are placed
+in packages with B<-dbg> added to their name.
+
+=item B<-k>, B<--keep-debug>
+
+Debug symbols will be retained, but split into an independent
+file in F<usr/lib/debug/> in the package build directory. B<--dbg-package>
+is easier to use than this option, but this option is more flexible.
+
=back
=head1 NOTES
-If the DEB_BUILD_OPTIONS environment variable contains "nostrip", nothing
-will be stripped, in accordance with Debian policy.
+If the B<DEB_BUILD_OPTIONS> environment variable contains B<nostrip>, nothing
+will be stripped, in accordance with Debian policy (section 10.1
+"Binaries").
=head1 CONFORMS TO
=cut
-init();
+init(options => {
+ "keep-debug" => \$dh{K_FLAG},
+});
# This variable can be used to turn off stripping (see Policy).
-if (defined $ENV{DEB_BUILD_OPTIONS} && $ENV{DEB_BUILD_OPTIONS} =~ /nostrip/) {
+if (get_buildoption('nostrip')) {
exit;
}
+my $objcopy = cross_command("objcopy");
+my $strip = cross_command("strip");
+
# I could just use `file $_[0]`, but this is safer
sub get_file_type {
my $file=shift;
my (@shared_libs, @executables, @static_libs);
sub testfile {
return if -l $_ or -d $_; # Skip directories and symlinks always.
-
+
# See if we were asked to exclude this file.
# Note that we have to test on the full filename, including directory.
my $fn="$File::Find::dir/$_";
return if $fn=~m/debug\/.*\.so/;
# Does its filename look like a shared library?
- if (m/.*\.so.*?/) {
+ # (*.cmxs are OCaml native code shared libraries)
+ if (m/.*\.(so.*?|cmxs$)/) {
# Ok, do the expensive test.
my $type=get_file_type($_);
if ($type=~m/.*ELF.*shared.*/) {
# Is it a static library, and not a debug library?
if (m/lib.*\.a$/ && ! m/.*_g\.a$/) {
- push @static_libs, $fn;
- return;
+ # Is it a binary file, or something else (maybe a liner
+ # script on Hurd, for example? I don't use file, because
+ # file returns a variety of things on static libraries.
+ if (-B $_) {
+ push @static_libs, $fn;
+ return;
+ }
+ }
+}
+
+sub make_debug {
+ my $file=shift;
+ my $tmp=shift;
+ my $desttmp=shift;
+
+ # Don't try to copy debug symbols out if the file is already
+ # stripped.
+ return unless get_file_type($file) =~ /not stripped/;
+
+ my ($base_file)=$file=~/^\Q$tmp\E(.*)/;
+ my $debug_path;
+ if (! compat(8) &&
+ `readelf -n $file`=~ /^\s+Build ID: ([0-9a-f]{2})([0-9a-f]+)$/m) {
+ $debug_path=$desttmp."/usr/lib/debug/.build-id/$1/$2.debug"
+ }
+ else {
+ $debug_path=$desttmp."/usr/lib/debug/".$base_file;
+ }
+ my $debug_dir=dirname($debug_path);
+ if (! -d $debug_dir) {
+ doit("install", "-d", $debug_dir);
}
+ if (compat(8)) {
+ doit($objcopy, "--only-keep-debug", $file, $debug_path);
+ }
+ else {
+ doit($objcopy, "--only-keep-debug", "--compress-debug-sections", $file, $debug_path);
+ }
+ # No reason for this to be executable.
+ doit("chmod", 644, $debug_path);
+ return $debug_path;
+}
+
+sub attach_debug {
+ my $file=shift;
+ my $debug_path=shift;
+ doit($objcopy, "--add-gnu-debuglink", $debug_path, $file);
}
foreach my $package (@{$dh{DOPACKAGES}}) {
my $tmp=tmpdir($package);
+ # Support for keeping the debugging symbols in a detached file.
+ my $keep_debug=$dh{K_FLAG};
+ my $debugtmp=$tmp;
+ if (! compat(4)) {
+ if (ref $dh{DEBUGPACKAGES}) {
+ $keep_debug=1;
+ # Note that it's only an array for the v4 stuff;
+ # for v5 only one value is used.
+ my $debugpackage=@{$dh{DEBUGPACKAGES}}[0];
+ if (! grep { $_ eq $debugpackage } getpackages()) {
+ error("debug package $debugpackage is not listed in the control file");
+ }
+ $debugtmp=tmpdir($debugpackage);
+ }
+ }
+ else {
+ if (ref $dh{DEBUGPACKAGES} && grep { $_ eq $package } @{$dh{DEBUGPACKAGES}}) {
+ $keep_debug=1;
+ $debugtmp=tmpdir($package."-dbg");
+ }
+ }
+
+ @shared_libs=@executables=@static_libs=();
find(\&testfile,$tmp);
foreach (@shared_libs) {
+ my $debug_path = make_debug($_, $tmp, $debugtmp) if $keep_debug;
# Note that all calls to strip on shared libs
- # *must* inclde the --strip-unneeded.
- doit("strip","--remove-section=.comment",
+ # *must* include the --strip-unneeded.
+ doit($strip,"--remove-section=.comment",
"--remove-section=.note","--strip-unneeded",$_);
+ attach_debug($_, $debug_path) if defined $debug_path;
}
foreach (@executables) {
- doit("strip","--remove-section=.comment",
+ my $debug_path = make_debug($_, $tmp, $debugtmp) if $keep_debug;
+ doit($strip,"--remove-section=.comment",
"--remove-section=.note",$_);
+ attach_debug($_, $debug_path) if defined $debug_path;
}
foreach (@static_libs) {
- doit("strip","--strip-debug",$_);
+ doit($strip,"--strip-debug",$_);
}
}
=head1 SEE ALSO
-L<debhelper(1)>
+L<debhelper(7)>
This program is a part of debhelper.
projects / debhelper.git / blobdiff