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Does ldd also show dependency dependencies?

I have a binary for which ldd shows an unexpected dependency and libicuuc (on "icu").

#ldd A [...] libxml2.so.2 => /usr/lib64/libxml2.so.2 (0x00007faaf9722000) libicuuc.so.49 => /usr/lib64/libicuuc.so.49 (0x00007faaf5689000)

Since libxml is dynamically dependent on libicuuc on this system, does it make sense that ldd enventually finishes detecting it, but did he expect that libicuuc will also appear in the ldd output for A? Is there any command to extract only libraries that are related as dependency dependencies?

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1 answer

ldd displays all the libraries that need to be loaded when the application starts or when loading the shared library.

readelf -d only shows direct binary dependencies.

 $ readelf -d /opt/google/chrome/chrome | grep NEEDED 0x0000000000000001 (NEEDED) Shared library: [libX11.so.6] 0x0000000000000001 (NEEDED) Shared library: [libXrandr.so.2] 0x0000000000000001 (NEEDED) Shared library: [libXrender.so.1] 0x0000000000000001 (NEEDED) Shared library: [libXss.so.1] 0x0000000000000001 (NEEDED) Shared library: [libXext.so.6] 0x0000000000000001 (NEEDED) Shared library: [librt.so.1] 0x0000000000000001 (NEEDED) Shared library: [libdl.so.2] 0x0000000000000001 (NEEDED) Shared library: [libgobject-2.0.so.0] 0x0000000000000001 (NEEDED) Shared library: [libgthread-2.0.so.0] 0x0000000000000001 (NEEDED) Shared library: [libglib-2.0.so.0] 0x0000000000000001 (NEEDED) Shared library: [libgtk-x11-2.0.so.0] 0x0000000000000001 (NEEDED) Shared library: [libgdk-x11-2.0.so.0] 0x0000000000000001 (NEEDED) Shared library: [libatk-1.0.so.0] 0x0000000000000001 (NEEDED) Shared library: [libgdk_pixbuf-2.0.so.0] 0x0000000000000001 (NEEDED) Shared library: [libpangocairo-1.0.so.0] 0x0000000000000001 (NEEDED) Shared library: [libcairo.so.2] 0x0000000000000001 (NEEDED) Shared library: [libpango-1.0.so.0] 0x0000000000000001 (NEEDED) Shared library: [libfreetype.so.6] 0x0000000000000001 (NEEDED) Shared library: [libfontconfig.so.1] 0x0000000000000001 (NEEDED) Shared library: [libnss3.so] 0x0000000000000001 (NEEDED) Shared library: [libnssutil3.so] 0x0000000000000001 (NEEDED) Shared library: [libsmime3.so] 0x0000000000000001 (NEEDED) Shared library: [libplc4.so] 0x0000000000000001 (NEEDED) Shared library: [libnspr4.so] 0x0000000000000001 (NEEDED) Shared library: [libpthread.so.0] 0x0000000000000001 (NEEDED) Shared library: [libgconf-2.so.4] 0x0000000000000001 (NEEDED) Shared library: [libdbus-1.so.3] 0x0000000000000001 (NEEDED) Shared library: [libXcomposite.so.1] 0x0000000000000001 (NEEDED) Shared library: [libasound.so.2] 0x0000000000000001 (NEEDED) Shared library: [libXfixes.so.3] 0x0000000000000001 (NEEDED) Shared library: [libcups.so.2] 0x0000000000000001 (NEEDED) Shared library: [libgcrypt.so.11] 0x0000000000000001 (NEEDED) Shared library: [libbz2.so.1.0] 0x0000000000000001 (NEEDED) Shared library: [libexpat.so.1] 0x0000000000000001 (NEEDED) Shared library: [libudev.so.0] 0x0000000000000001 (NEEDED) Shared library: [libstdc++.so.6] 0x0000000000000001 (NEEDED) Shared library: [libm.so.6] 0x0000000000000001 (NEEDED) Shared library: [libgcc_s.so.1] 0x0000000000000001 (NEEDED) Shared library: [libc.so.6] 0x0000000000000001 (NEEDED) Shared library: [ld-linux-x86-64.so.2] $ ldd /opt/google/chrome/chrome linux-vdso.so.1 => (0x00007fff9d3ff000) libX11.so.6 => /lib64/libX11.so.6 (0x00007f93186dc000) libXrandr.so.2 => /lib64/libXrandr.so.2 (0x00007f93184d3000) libXrender.so.1 => /lib64/libXrender.so.1 (0x00007f93182c9000) libXss.so.1 => /lib64/libXss.so.1 (0x00007f93180c5000) libXext.so.6 => /lib64/libXext.so.6 (0x00007f9317eb2000) librt.so.1 => /lib64/librt.so.1 (0x00007f9317caa000) libdl.so.2 => /lib64/libdl.so.2 (0x00007f9317aa6000) libgobject-2.0.so.0 => /lib64/libgobject-2.0.so.0 (0x00007f9317858000) libgthread-2.0.so.0 => /lib64/libgthread-2.0.so.0 (0x00007f9317656000) libglib-2.0.so.0 => /lib64/libglib-2.0.so.0 (0x00007f9317336000) libgtk-x11-2.0.so.0 => /lib64/libgtk-x11-2.0.so.0 (0x00007f9316cbf000) libgdk-x11-2.0.so.0 => /lib64/libgdk-x11-2.0.so.0 (0x00007f9316a00000) libatk-1.0.so.0 => /lib64/libatk-1.0.so.0 (0x00007f93167de000) libgdk_pixbuf-2.0.so.0 => /lib64/libgdk_pixbuf-2.0.so.0 (0x00007f93165bb000) libpangocairo-1.0.so.0 => /lib64/libpangocairo-1.0.so.0 (0x00007f93163ae000) libcairo.so.2 => /lib64/libcairo.so.2 (0x00007f9316103000) libpango-1.0.so.0 => /lib64/libpango-1.0.so.0 (0x00007f9315eb7000) libfreetype.so.6 => /usr/lib64/freetype-freeworld/libfreetype.so.6 (0x00007f9315c15000) libfontconfig.so.1 => /lib64/libfontconfig.so.1 (0x00007f93159e0000) libnss3.so => /lib64/libnss3.so (0x00007f93156a4000) libnssutil3.so => /lib64/libnssutil3.so (0x00007f9315479000) libsmime3.so => /lib64/libsmime3.so (0x00007f931524c000) libplc4.so => /lib64/libplc4.so (0x00007f9315046000) libnspr4.so => /lib64/libnspr4.so (0x00007f9314e09000) libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f9314bed000) libgconf-2.so.4 => /lib64/libgconf-2.so.4 (0x00007f93149bc000) libdbus-1.so.3 => /lib64/libdbus-1.so.3 (0x00007f9314778000) libXcomposite.so.1 => /lib64/libXcomposite.so.1 (0x00007f9314575000) libasound.so.2 => /lib64/libasound.so.2 (0x00007f9314294000) libXfixes.so.3 => /lib64/libXfixes.so.3 (0x00007f931408e000) libcups.so.2 => /lib64/libcups.so.2 (0x00007f9313e33000) libgcrypt.so.11 => /lib64/libgcrypt.so.11 (0x00007f9313bba000) libbz2.so.1.0 => not found libexpat.so.1 => /lib64/libexpat.so.1 (0x00007f9313991000) libudev.so.0 => /lib64/libudev.so.0 (0x00007f9313782000) libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007f931347f000) libm.so.6 => /lib64/libm.so.6 (0x00007f9313184000) libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f9312f6e000) libc.so.6 => /lib64/libc.so.6 (0x00007f9312bb7000) /lib64/ld-linux-x86-64.so.2 (0x0000003c7a000000) libxcb.so.1 => /lib64/libxcb.so.1 (0x00007f9312999000) libffi.so.5 => /lib64/libffi.so.5 (0x00007f9312790000) libgmodule-2.0.so.0 => /lib64/libgmodule-2.0.so.0 (0x00007f931258c000) libgio-2.0.so.0 => /lib64/libgio-2.0.so.0 (0x00007f931223f000) libpangoft2-1.0.so.0 => /lib64/libpangoft2-1.0.so.0 (0x00007f9312012000) libXinerama.so.1 => /lib64/libXinerama.so.1 (0x00007f9311e0f000) libXi.so.6 => /lib64/libXi.so.6 (0x00007f9311c00000) libXcursor.so.1 => /lib64/libXcursor.so.1 (0x00007f93119f4000) libXdamage.so.1 => /lib64/libXdamage.so.1 (0x00007f93117f1000) libpng15.so.15 => /lib64/libpng15.so.15 (0x00007f93115c7000) libpixman-1.so.0 => /lib64/libpixman-1.so.0 (0x00007f9311340000) libz.so.1 => /lib64/libz.so.1 (0x00007f9311129000) libplds4.so => /lib64/libplds4.so (0x00007f9310f24000) libdbus-glib-1.so.2 => /lib64/libdbus-glib-1.so.2 (0x00007f9310cfd000) libgssapi_krb5.so.2 => /lib64/libgssapi_krb5.so.2 (0x00007f9310ab8000) libkrb5.so.3 => /lib64/libkrb5.so.3 (0x00007f93107d3000) libk5crypto.so.3 => /lib64/libk5crypto.so.3 (0x00007f93105a8000) libcom_err.so.2 => /lib64/libcom_err.so.2 (0x00007f93103a3000) libgnutls.so.26 => /lib64/libgnutls.so.26 (0x00007f93100eb000) libgpg-error.so.0 => /lib64/libgpg-error.so.0 (0x00007f930fee7000) libavahi-common.so.3 => /lib64/libavahi-common.so.3 (0x00007f930fcd9000) libavahi-client.so.3 => /lib64/libavahi-client.so.3 (0x00007f930fac8000) libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007f930f891000) libXau.so.6 => /lib64/libXau.so.6 (0x00007f930f68c000) libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f930f46b000) libresolv.so.2 => /lib64/libresolv.so.2 (0x00007f930f251000) libkrb5support.so.0 => /lib64/libkrb5support.so.0 (0x00007f930f046000) libkeyutils.so.1 => /lib64/libkeyutils.so.1 (0x00007f930ee42000) libtasn1.so.3 => /lib64/libtasn1.so.3 (0x00007f930ec31000) libp11-kit.so.0 => /lib64/libp11-kit.so.0 (0x00007f930ea1e000) libfreebl3.so => /lib64/libfreebl3.so (0x00007f930e7b3000)

Is there any command to extract only libraries that are related as dependency dependencies?

You can set the difference between the outputs ldd and readelf -d .

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