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NAME | SYNOPSIS | DESCRIPTION | FILES | OPTIONS | EXAMPLES | SEE ALSO | AUTHOR | COLOPHON |
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DH_MAKESHLIBS(1) Debhelper DH_MAKESHLIBS(1)
dh_makeshlibs - automatically create shlibs file and call
dpkg-gensymbols
dh_makeshlibs [debhelper options] [-mmajor] [-V[dependencies]]
[-n] [-Xitem] [-- params]
dh_makeshlibs is a debhelper program that automatically scans for
shared libraries, and generates a shlibs file for the libraries it
finds.
It will also ensure that ldconfig is invoked during install and
removal when it finds shared libraries. Since debhelper
9.20151004, this is done via a dpkg trigger. In older versions of
debhelper, dh_makeshlibs would generate a maintainer script for
this purpose.
Since debhelper 12.3, dh_makeshlibs will by default add an
additional udeb line for udebs in the shlibs file, when the udeb
has the same name as the deb followed by a "-udeb" suffix (e.g. if
the deb is called "libfoo1", then debhelper will auto-detect the
udeb if it is named "libfoo1-udeb"). Please use the --add-udeb and
--no-add-udeb options below when this auto-detection is
insufficient.
If you previously used --add-udeb and are considering to migrate
to using the new auto-detection feature in 12.3, then please
remember to test that the resulting DEBIAN/shlibs files are as
expected. There are some known corner cases, where the
auto-detection is insufficient. These include when the udeb
contains library files from multiple regular deb packages or when
the packages do not follow the expected naming convention.
debian/package.shlibs
Installs this file, if present, into the package as
DEBIAN/shlibs. If omitted, debhelper will generate a shlibs
file automatically if it detects any libraries.
Note in compat levels 9 and earlier, this file was installed
by dh_installdeb(1) rather than dh_makeshlibs.
debian/package.symbols
debian/package.symbols.arch
These symbols files, if present, are passed to
dpkg-gensymbols(1) to be processed and installed. Use the arch
specific names if you need to provide different symbols files
for different architectures.
-mmajor, --major=major
Instead of trying to guess the major number of the library
with objdump, use the major number specified after the -m
parameter. This is much less useful than it used to be, back
in the bad old days when this program looked at library
filenames rather than using objdump.
-V, -Vdependencies
--version-info, --version-info=dependencies
If a shlibs file is generated by this program, this option
controls what version will be used in the dependency relation.
In compat 12 and later, dh_makeshlibs defaults to
-VUpstream-Version. In compat 11 and earlier the default
behaved like -VNone.
The dh_makeshlibs tool can generate dependencies in three
variants:
-VUpstream-Version
The dependency will be "packagename (>= packageversion)".
Note that Upstream-Version is case-sensitive and must be
written exactly as shown here.
This is a conservative setting that always ensures that
other packages' shared library dependencies are at least
as tight as they need to be (unless the library is prone
to changing ABI without updating the upstream version
number).
The flip side is that packages might end up with
dependencies that are too tight in some cases (note a
symbols file can mitigate this issue). This is often of
minor temporary inconvenience and usually a lot better
than the fall out caused by forgetting to bump the
dependency information.
This explicit form was added in debhelper/11.3. In
previous versions, a -V without any dependency information
was used instead (and that form still works)
-VNone
The dependency will be "packagename". Note that None is
case-sensitive and must be written exactly as shown here.
This form is generally unsafe with the only exception
being if upstream does not extend the ABI in any way.
However, most upstreams improve their interfaces over time
and packagers are recommended to use -VUpstream-Version
(or one of the other forms of -Vdependencies).
Alternatively, this may be sufficient if (and only if) the
package uses symbol versioning (see dpkg-gensymbols(1))
and does not build any udeb packages. Note that symbols
are not supported for udeb packages, which solely relies
on shlibs for dependency handling.
-Vpackage-relation
In this case, the value passed to -V will be used as a
dependency relation. The package-relation should
generally be of the form "some-package-name (>=
some-package-version)". Remember to include the package
name.
Note that debhelper will use the value as it is with no
sanity checking or modification. In rare special cases,
this is needed to generate a dependency on a different
package than the one containing the library.
When choosing a value for this option, please keep mind that
if the package provides a symbols file, then that this is
generally preferred over the shlibs file for regular .deb
packages. See dpkg-shlibdeps(1) for more information on this
topic.
-n, --no-scripts
Do not add the "ldconfig" trigger even if it seems like the
package might need it. The option is called --no-scripts for
historical reasons as dh_makeshlibs would previously generate
maintainer scripts that called ldconfig.
-Xitem, --exclude=item
Exclude files that contain item anywhere in their filename or
directory from being treated as shared libraries.
--add-udeb=udeb
Create an additional line for udebs in the shlibs file and use
udeb as the package name for udebs to depend on instead of the
regular library package.
This option is only useful for special cases such as when
debhelper cannot auto-detect package name of the udeb package,
when the udeb will contain libraries from multiple deb
packages, or when the udeb contains libraries not present in
the deb package.
--no-add-udeb
Do not add any udeb lines to the shlibs file. This can be
used to disable the default auto-detection of udebs.
This may be useful in case you do not want a shlibs file at
all for the udeb because no package will depend on it. E.g.
because adding a udeb package for the library was "overkill"
and the library is embedded in a different udeb package.
-- params
Pass params to dpkg-gensymbols(1).
dh_makeshlibs -VNone
Assuming this is a package named libfoobar1, generates a
shlibs file that looks something like:
libfoobar 1 libfoobar1
dh_makeshlibs -VUpstream-Version
Assuming the current version of the package is 1.1-3,
generates a shlibs file that looks something like:
libfoobar 1 libfoobar1 (>= 1.1)
dh_makeshlibs -V 'libfoobar1 (>= 1.0)'
Generates a shlibs file that looks something like:
libfoobar 1 libfoobar1 (>= 1.0)
debhelper(7)
This program is a part of debhelper.
Joey Hess <[email protected]>
This page is part of the debhelper (helper programs for
debian/rules) project. Information about the project can be found
at [unknown -- if you know, please contact [email protected]] If
you have a bug report for this manual page, send it to
[email protected]. This page was obtained from the project's
upstream Git repository
⟨https://salsa.debian.org/debian/debhelper.git⟩ on 2025-08-11.
(At that time, the date of the most recent commit that was found
in the repository was 2025-08-10.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
[email protected]
13.23 2025-01-02 DH_MAKESHLIBS(1)
Pages that refer to this page: dh_installdeb(1), debhelper(7), debhelper-compat-upgrade-checklist(7)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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