Ldd mostra anche le dipendenze delle dipendenze?

Question

Ho un binario per il quale ldd mostra una dipendenza imprevista e libicuuc (da "icu").

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

Dato che su questo libxml sistema dipende in modo dinamico sulla libicuuc, ha senso che LDD enventually finisce per trovarlo, ma si prevede che libicuuc appare anche nell'output LDD per A? Esiste un comando per recuperare solo le librerie collegate come dipendenze delle dipendenze?

Answer 1

ldd mostra tutte le librerie che avrebbe bisogno di caricare all'avvio dell'applicazione o caricare una libreria condivisa.

readelf -d mostra solo le dipendenze dirette del binario.

$ 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) 

C'è qualche comando per recuperare solo le librerie che sono collegati come dipendenze di dipendenze?

È possibile impostare la differenza delle uscite ldd e readelf -d.