deb-symbols(5) — Linux manual page


deb-symbols(5)                 dpkg suite                 deb-symbols(5)

NAME         top

       deb-symbols - Debian's extended shared library information file

SYNOPSIS         top


DESCRIPTION         top

       The symbol files are shipped in Debian binary packages, and its
       format is a subset of the template symbol files used by
       dpkg-gensymbols(1) in Debian source packages, see

       The format for an extended shared library dependency information
       entry in these files is:

        library-soname main-dependency-template
        [| alternative-dependency-template]
        [* field-name: field-value]
         symbol minimal-version [id-of-dependency-template]

       The library-soname is exactly the value of the SONAME field as
       exported by objdump(1). A dependency-template is a dependency
       where #MINVER# is dynamically replaced either by a version check
       like “(>= minimal-version)” or by nothing (if an unversioned
       dependency is deemed sufficient).

       Each exported symbol (listed as name@version, with version being
       “Base” if the library is not versioned) is associated to a
       minimal-version of its dependency template (the main dependency
       template is always used and will end up being combined with the
       dependency template referenced by id-of-dependency-template if
       present). The first alternative dependency template is numbered
       1, the second one 2, etc.  Each column is separated by exactly a
       single whitespace.

       Each entry for a library can also have some fields of meta-
       information.  Those fields are stored on lines starting with an
       asterisk. Currently, the only valid fields are:

           It indicates the name of the “-dev” package associated to the
           library and is used by dpkg-shlibdeps to make sure that the
           dependency generated is at least as strict as the
           corresponding build dependency (since dpkg 1.14.13).

           The same as Build-Depends-Package but accepts a comma-
           separated list of package names (since dpkg 1.20.0).  This
           field will override any Build-Depends-Package field present,
           and is mostly useful with “-dev” packages and metapackages
           depending on these, say for a transition period.

           It indicates what internal symbol groups should be ignored,
           as a whitespace separated list, so that the symbols contained
           in those groups get included in the output file (since dpkg
           1.20.1).  This should only be necessary for toolchain
           packages providing those internal symbols. The available
           groups are system dependent, for ELF and GNU-based systems
           these are aeabi and gomp.

           A deprecated alias for Allow-Internal-Symbol-Groups (since
           dpkg 1.20.1, supported since dpkg 1.17.6).

EXAMPLES         top

   Simple symbols file libftp3 #MINVER#
         DefaultNetbuf@Base 3.1-1-6
         FtpAccess@Base 3.1-1-6

   Advanced symbols file libgl1
        | libgl1-mesa-glx #MINVER#
        * Build-Depends-Package: libgl1-mesa-dev
         publicGlSymbol@Base 6.3-1
         implementationSpecificSymbol@Base 6.5.2-7 1

SEE ALSO         top

       deb-src-symbols(5), dpkg-shlibdeps(1), dpkg-gensymbols(1).

COLOPHON         top

       This page is part of the dpkg (Debian Package Manager) project.
       Information about the project can be found at 
       ⟨⟩.  If you have a bug report
       for this manual page, see
       ⟨⟩.  This
       page was obtained from the project's upstream Git repository ⟨git
       clone⟩ on 2023-12-22.  (At
       that time, the date of the most recent commit that was found in
       the repository was 2023-12-18.)  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

1.22.0-52-g1af0                2023-08-30                 deb-symbols(5)

Pages that refer to this page: dpkg-gensymbols(1)dpkg-shlibdeps(1)deb(5)deb-shlibs(5)deb-src-symbols(5)