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Top Forums Programming How to make use others' C library installed not for the system-wide (Ubuntu/Linux)? Post 303043006 by yifangt on Wednesday 15th of January 2020 05:28:11 PM
Old 01-15-2020
Come to ld_config now

The compiling worked after:
Code:
$ LIBROOT="/home/yifangt/Study/C/VCF/htslib-1.10.2"
$ gcc -Wall -O3 -o vcf_parser01 vcf_parser01.c vcf.c  -I ${LIBROOT}/htslib -I ${LIBROOT} -L ${LIBROOT}  -lhts
$ ./vcf_parser01: error while loading shared libraries: libhts.so.3: cannot open shared object file: No such file or directory
$ ldd ./vcf_parser01
    linux-vdso.so.1 (0x00007ffdde13d000)
    libhts.so.3 => not found
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fa2c16bd000)
    /lib64/ld-linux-x86-64.so.2 (0x00007fa2c1cb0000)

It seems I'm getting closer to the point now. The shared library libhts.so.3 is located in ${LIBROOT}.
I did not mean to be lazy without digging the ld_config(?) or related subjects, but simply to stay consistent with this same example to avoid confusion.
How to ensure the dynamic library is available for the new executable vcf_parser01 just compiled?

Thanks!

Last edited by yifangt; 01-15-2020 at 06:40 PM.. Reason: adding now info
 

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LDD(1)							     Linux Programmer's Manual							    LDD(1)

NAME
ldd - print shared object dependencies SYNOPSIS
ldd [option]... file... DESCRIPTION
ldd prints the shared objects (shared libraries) required by each program or shared object specified on the command line. An example of its use and output is the following: $ ldd /bin/ls linux-vdso.so.1 (0x00007ffcc3563000) libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f87e5459000) libcap.so.2 => /lib64/libcap.so.2 (0x00007f87e5254000) libc.so.6 => /lib64/libc.so.6 (0x00007f87e4e92000) libpcre.so.1 => /lib64/libpcre.so.1 (0x00007f87e4c22000) libdl.so.2 => /lib64/libdl.so.2 (0x00007f87e4a1e000) /lib64/ld-linux-x86-64.so.2 (0x00005574bf12e000) libattr.so.1 => /lib64/libattr.so.1 (0x00007f87e4817000) libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f87e45fa000) In the usual case, ldd invokes the standard dynamic linker (see ld.so(8)) with the LD_TRACE_LOADED_OBJECTS environment variable set to 1. This causes the dynamic linker to inspect the program's dynamic dependencies, and find (according to the rules described in ld.so(8)) and load the objects that satisfy those dependencies. For each dependency, ldd displays the location of the matching object and the (hexadeci- mal) address at which it is loaded. (The linux-vdso and ld-linux shared dependencies are special; see vdso(7) and ld.so(8).) Security Be aware that in some circumstances (e.g., where the program specifies an ELF interpreter other than ld-linux.so), some versions of ldd may attempt to obtain the dependency information by attempting to directly execute the program, which may lead to the execution of whatever code is defined in the program's ELF interpreter, and perhaps to execution of the program itself. (In glibc versions before 2.27, the upstream ldd implementation did this for example, although most distributions provided a modified version that did not.) Thus, you should never employ ldd on an untrusted executable, since this may result in the execution of arbitrary code. A safer alterna- tive when dealing with untrusted executables is: $ objdump -p /path/to/program | grep NEEDED Note, however, that this alternative shows only the direct dependencies of the executable, while ldd shows the entire dependency tree of the executable. OPTIONS
--version Print the version number of ldd. -v, --verbose Print all information, including, for example, symbol versioning information. -u, --unused Print unused direct dependencies. (Since glibc 2.3.4.) -d, --data-relocs Perform relocations and report any missing objects (ELF only). -r, --function-relocs Perform relocations for both data objects and functions, and report any missing objects or functions (ELF only). --help Usage information. BUGS
ldd does not work on a.out shared libraries. ldd does not work with some extremely old a.out programs which were built before ldd support was added to the compiler releases. If you use ldd on one of these programs, the program will attempt to run with argc = 0 and the results will be unpredictable. SEE ALSO
pldd(1), sprof(1), ld.so(8), ldconfig(8) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. 2017-09-15 LDD(1)
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