Ldd có hiển thị phụ thuộc của phụ thuộc không?

Question

Tôi có một nhị phân mà ldd cho thấy một phụ thuộc bất ngờ und libicuuc (từ "icu").

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

Từ trên hệ thống libxml điều này phụ thuộc vào động libicuuc, nó có ý nghĩa rằng LDD enventually kết thúc việc tìm kiếm nó, nhưng nó nó dự kiến ​​libicuuc đó cũng xuất hiện trong đầu ra ldd cho A? Có một số lệnh để lấy chỉ các thư viện được liên kết như phụ thuộc của phụ thuộc?

Answer 1

ldd hiển thị tất cả thư viện cần tải khi khởi động ứng dụng hoặc tải thư viện được chia sẻ.

readelf -d chỉ hiển thị phụ thuộc trực tiếp của nhị phân.

$ 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) 

Có một số lệnh để lấy chỉ các thư viện được liên kết trong khi phụ thuộc phụ thuộc?

Bạn có thể thực hiện sự khác biệt đã đặt của các đầu ra ldd và readelf -d.