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g++ --std=c++11 -fPIC -fvisibility=hidden -c fooapi/foo.cpp -o fooapi/foo.o g++ -fPIC -fvisibility=hidden -shared -Wl,-soname,libfoo.so.1.0.0 -o lib/libfoo.so.1.0.0 fooapi/foo.o ldd lib/libfoo.so.1.0.0 linux-vdso.so.1 => (0x00007ffe0e12c000) libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007fcf7f9dc000) libm.so.6 => /lib64/libm.so.6 (0x00007fcf7f6da000) libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007fcf7f4c4000) libc.so.6 => /lib64/libc.so.6 (0x00007fcf7f0f7000) /lib64/ld-linux-x86-64.so.2 (0x00007fcf7fee7000) g++ --std=c++11 -fPIC -fvisibility=hidden -c fooapir2/foo.cpp -o fooapir2/foo.o g++ -fPIC -fvisibility=hidden -shared -Wl,-soname,libfoo.so.1.0.2 -o lib/libfoo.so.1.0.2 fooapir2/foo.o ldd lib/libfoo.so.1.0.* lib/libfoo.so.1.0.0: linux-vdso.so.1 => (0x00007fffc7d5d000) libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007f467a3fc000) libm.so.6 => /lib64/libm.so.6 (0x00007f467a0fa000) libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f4679ee4000) libc.so.6 => /lib64/libc.so.6 (0x00007f4679b17000) /lib64/ld-linux-x86-64.so.2 (0x00007f467a907000) lib/libfoo.so.1.0.2: linux-vdso.so.1 => (0x00007ffcc05fd000) libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007f7968bfe000) libm.so.6 => /lib64/libm.so.6 (0x00007f79688fc000) libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f79686e6000) libc.so.6 => /lib64/libc.so.6 (0x00007f7968319000) /lib64/ld-linux-x86-64.so.2 (0x00007f7969109000) cd lib; ln -s libfoo.so.1.0.0 libfoo.so.1; ln -s libfoo.so.1 libfoo.so; cd .. total 40 lrwxrwxrwx. 1 amd amd 11 Sep 4 11:30 libfoo.so -> libfoo.so.1 lrwxrwxrwx. 1 amd amd 15 Sep 4 11:30 libfoo.so.1 -> libfoo.so.1.0.0 -rwxrwxr-x. 1 amd amd 20120 Sep 4 11:16 libfoo.so.1.0.0 -rwxrwxr-x. 1 amd amd 20120 Sep 4 11:23 libfoo.so.1.0.2 g++ --std=c++11 -Ifooapi -fPIC -fvisibility=hidden -c barapi/bar.cpp -o barapi/bar.o g++ -fPIC -fvisibility=hidden -shared -Wl,-soname,libbar.so.1.0.0 -o lib/libbar.so.1.0.0 barapi/bar.o cd lib; ln -s libbar.so.1.0.0 libbar.so.1; ln -s libbar.so.1 libbar.so; cd .. total 60 lrwxrwxrwx. 1 amd amd 11 Sep 4 11:37 libbar.so -> libbar.so.1 lrwxrwxrwx. 1 amd amd 15 Sep 4 11:37 libbar.so.1 -> libbar.so.1.0.0 -rwxrwxr-x. 1 amd amd 20160 Sep 4 11:34 libbar.so.1.0.0 lrwxrwxrwx. 1 amd amd 11 Sep 4 11:30 libfoo.so -> libfoo.so.1 lrwxrwxrwx. 1 amd amd 15 Sep 4 11:30 libfoo.so.1 -> libfoo.so.1.0.0 -rwxrwxr-x. 1 amd amd 20120 Sep 4 11:16 libfoo.so.1.0.0 -rwxrwxr-x. 1 amd amd 20120 Sep 4 11:23 libfoo.so.1.0.2 g++ --std=c++11 -Ifooapi -Ibarapi main.cpp -o main -Llib -lfoo -lbar LD_LIBRARY_PATH=lib ldd ./main linux-vdso.so.1 => (0x00007ffca29e4000) libfoo.so.1.0.0 => lib/libfoo.so.1.0.0 (0x00007f5a8572a000) libbar.so.1.0.0 => lib/libbar.so.1.0.0 (0x00007f5a85526000) libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007f5a8521f000) libm.so.6 => /lib64/libm.so.6 (0x00007f5a84f1d000) libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f5a84d07000) libc.so.6 => /lib64/libc.so.6 (0x00007f5a8493a000) /lib64/ld-linux-x86-64.so.2 (0x00007f5a8592e000) Make libbar depend on libfoo - recompile libbar and main app g++ -fPIC -fvisibility=hidden -shared -Wl,-soname,libbar.so.1.0.0 -o lib/libbar.so.1.0.0 barapi/bar.o -Llib -lfoo ldd lib/libbar.so linux-vdso.so.1 => (0x00007ffc5db8e000) libfoo.so.1.0.0 => not found libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007f82064d2000) libm.so.6 => /lib64/libm.so.6 (0x00007f82061d0000) libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f8205fba000) libc.so.6 => /lib64/libc.so.6 (0x00007f8205bed000) /lib64/ld-linux-x86-64.so.2 (0x00007f82069dd000) LD_LIBRARY_PATH=lib ldd lib/libbar.so linux-vdso.so.1 => (0x00007fff7f1f5000) libfoo.so.1.0.0 => lib/libfoo.so.1.0.0 (0x00007f3566b82000) libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007f356687b000) libm.so.6 => /lib64/libm.so.6 (0x00007f3566579000) libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f3566363000) libc.so.6 => /lib64/libc.so.6 (0x00007f3565f96000) /lib64/ld-linux-x86-64.so.2 (0x00007f3566f8a000) g++ --std=c++11 -Ifooapi -Ibarapi main.cpp -o main -Llib -lbar /usr/bin/ld: warning: libfoo.so.1.0.0, needed by lib/libbar.so, not found (try using -rpath or -rpath-link) /tmp/ccPtxeEW.o: In function `main': main.cpp:(.text+0xa): undefined reference to `foo' collect2: error: ld returned 1 exit status Use rpath to the rescue - recompile libbar telling loader to look in for dep libs g++ -fPIC -fvisibility=hidden -shared -Wl,-soname,libbar.so.1.0.0 -Wl,-rpath,$ORIGIN -o lib/libbar.so.1.0.0 barapi/bar.o -Llib -lfoo Dynamic section at offset 0x2d98 contains 30 entries: Tag Type Name/Value 0x0000000000000001 (NEEDED) Shared library: [libfoo.so.1.0.0] 0x0000000000000001 (NEEDED) Shared library: [libstdc++.so.6] 0x0000000000000001 (NEEDED) Shared library: [libm.so.6] 0x0000000000000001 (NEEDED) Shared library: [libgcc_s.so.1] 0x0000000000000001 (NEEDED) Shared library: [libc.so.6] 0x000000000000000e (SONAME) Library soname: [libbar.so.1.0.0] 0x000000000000000f (RPATH) Library rpath: [$ORIGIN] 0x000000000000000c (INIT) 0x1560 0x000000000000000d (FINI) 0x2010 0x0000000000000019 (INIT_ARRAY) 0x202d68 0x000000000000001b (INIT_ARRAYSZ) 16 (bytes) 0x000000000000001a (FINI_ARRAY) 0x202d78 0x000000000000001c (FINI_ARRAYSZ) 8 (bytes) 0x000000006ffffef5 (GNU_HASH) 0x1f0 0x0000000000000005 (STRTAB) 0x830 0x0000000000000006 (SYMTAB) 0x2a8 0x000000000000000a (STRSZ) 1790 (bytes) 0x000000000000000b (SYMENT) 24 (bytes) 0x0000000000000003 (PLTGOT) 0x203000 0x0000000000000002 (PLTRELSZ) 960 (bytes) 0x0000000000000014 (PLTREL) RELA 0x0000000000000017 (JMPREL) 0x11a0 0x0000000000000007 (RELA) 0x1038 0x0000000000000008 (RELASZ) 360 (bytes) 0x0000000000000009 (RELAENT) 24 (bytes) 0x000000006ffffffe (VERNEED) 0xfa8 0x000000006fffffff (VERNEEDNUM) 3 0x000000006ffffff0 (VERSYM) 0xf2e 0x000000006ffffff9 (RELACOUNT) 4 0x0000000000000000 (NULL) 0x0 readelf -d main Dynamic section at offset 0xdd8 contains 29 entries: Tag Type Name/Value 0x0000000000000001 (NEEDED) Shared library: [libbar.so.1.0.0] 0x0000000000000001 (NEEDED) Shared library: [libfoo.so.1.0.0] 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] 0x000000000000000c (INIT) 0x400500 0x000000000000000d (FINI) 0x4006f4 0x0000000000000019 (INIT_ARRAY) 0x600dc0 0x000000000000001b (INIT_ARRAYSZ) 8 (bytes) 0x000000000000001a (FINI_ARRAY) 0x600dc8 0x000000000000001c (FINI_ARRAYSZ) 8 (bytes) 0x000000006ffffef5 (GNU_HASH) 0x400298 0x0000000000000005 (STRTAB) 0x4003c0 0x0000000000000006 (SYMTAB) 0x4002d0 0x000000000000000a (STRSZ) 171 (bytes) 0x000000000000000b (SYMENT) 24 (bytes) 0x0000000000000015 (DEBUG) 0x0 0x0000000000000003 (PLTGOT) 0x601000 0x0000000000000002 (PLTRELSZ) 72 (bytes) 0x0000000000000014 (PLTREL) RELA 0x0000000000000017 (JMPREL) 0x4004b8 0x0000000000000007 (RELA) 0x4004a0 0x0000000000000008 (RELASZ) 24 (bytes) 0x0000000000000009 (RELAENT) 24 (bytes) 0x000000006ffffffe (VERNEED) 0x400480 0x000000006fffffff (VERNEEDNUM) 1 0x000000006ffffff0 (VERSYM) 0x40046c 0x0000000000000000 (NULL) 0x0 g++ --std=c++11 -Ifooapi -Ibarapi main.cpp -o main -Llib -lbar -lfoo ldd main linux-vdso.so.1 => (0x00007ffc4efc7000) libbar.so.1.0.0 => not found libfoo.so.1.0.0 => not found libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007fb8a221f000) libm.so.6 => /lib64/libm.so.6 (0x00007fb8a1f1d000) libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007fb8a1d07000) libc.so.6 => /lib64/libc.so.6 (0x00007fb8a193a000) /lib64/ld-linux-x86-64.so.2 (0x00007fb8a2526000) LD_LIBRARY_PATH=lib ./main foo doimpl 10 version 1 foo foo doimpl 20 version 1 foo bar doimpl 20 version 1 bar Upgrade libfoo cd lib; rm libfoo.so.1; rm libfoo.so; ln -s libfoo.so.1.0.2 libfoo.so.1; ln -s libfoo.so.1 libfoo.so; cd .. total 60 lrwxrwxrwx. 1 amd amd 11 Sep 4 11:37 libbar.so -> libbar.so.1 lrwxrwxrwx. 1 amd amd 15 Sep 4 11:37 libbar.so.1 -> libbar.so.1.0.0 -rwxrwxr-x. 1 amd amd 20160 Sep 4 11:47 libbar.so.1.0.0 lrwxrwxrwx. 1 amd amd 11 Sep 4 13:06 libfoo.so -> libfoo.so.1 lrwxrwxrwx. 1 amd amd 15 Sep 4 13:06 libfoo.so.1 -> libfoo.so.1.0.2 -rwxrwxr-x. 1 amd amd 20120 Sep 4 11:16 libfoo.so.1.0.0 -rwxrwxr-x. 1 amd amd 20120 Sep 4 11:23 libfoo.so.1.0.2 LD_LIBRARY_PATH=lib ./main foo doimpl 10 version 1 foo foo doimpl 20 version 1 foo bar doimpl 20 version 1 bar main app works as libfoo.so.1.0.0 - old version still exists mv lib/libfoo.so.1.0.0 lib/hide_libfoo.so.1.0.0 total 60 -rwxrwxr-x. 1 amd amd 20120 Sep 4 11:16 hide_libfoo.so.1.0.0 lrwxrwxrwx. 1 amd amd 11 Sep 4 11:37 libbar.so -> libbar.so.1 lrwxrwxrwx. 1 amd amd 15 Sep 4 11:37 libbar.so.1 -> libbar.so.1.0.0 -rwxrwxr-x. 1 amd amd 20160 Sep 4 11:47 libbar.so.1.0.0 lrwxrwxrwx. 1 amd amd 11 Sep 4 13:06 libfoo.so -> libfoo.so.1 lrwxrwxrwx. 1 amd amd 15 Sep 4 13:06 libfoo.so.1 -> libfoo.so.1.0.2 -rwxrwxr-x. 1 amd amd 20120 Sep 4 11:23 libfoo.so.1.0.2 LD_LIBRARY_PATH=lib ./main ./main: error while loading shared libraries: libfoo.so.1.0.0: cannot open shared object file: No such file or directory Recompile libbar to use upgraded libfoo readelf -d lib/libbar.so | head -15 Dynamic section at offset 0x2d98 contains 30 entries: Tag Type Name/Value 0x0000000000000001 (NEEDED) Shared library: [libfoo.so.1.0.0] 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] 0x000000000000000e (SONAME) Library soname: [libbar.so.1.0.0] 0x000000000000000f (RPATH) Library rpath: [$ORIGIN] 0x000000000000000c (INIT) 0x1560 0x000000000000000d (FINI) 0x2010 0x0000000000000019 (INIT_ARRAY) 0x202d68 0x000000000000001b (INIT_ARRAYSZ) 16 (bytes) 0x000000000000001a (FINI_ARRAY) 0x202d78 g++ -fPIC -fvisibility=hidden -shared -Wl,-soname,libbar.so.1.0.1 -Wl,-rpath,$ORIGIN -o lib/libbar.so.1.0.1 barapi/bar.o -Llib -lfoo total 80 -rwxrwxr-x. 1 amd amd 20120 Sep 4 11:16 hide_libfoo.so.1.0.0 lrwxrwxrwx. 1 amd amd 11 Sep 4 11:37 libbar.so -> libbar.so.1 lrwxrwxrwx. 1 amd amd 15 Sep 4 11:37 libbar.so.1 -> libbar.so.1.0.0 -rwxrwxr-x. 1 amd amd 20160 Sep 4 11:47 libbar.so.1.0.0 -rwxrwxr-x. 1 amd amd 20160 Sep 4 13:15 libbar.so.1.0.1 lrwxrwxrwx. 1 amd amd 11 Sep 4 13:06 libfoo.so -> libfoo.so.1 lrwxrwxrwx. 1 amd amd 15 Sep 4 13:06 libfoo.so.1 -> libfoo.so.1.0.2 -rwxrwxr-x. 1 amd amd 20120 Sep 4 11:23 libfoo.so.1.0.2 libbar.so.1.0.1 is new ./main: error while loading shared libraries: libfoo.so.1.0.0: cannot open shared object file: No such file or directory readelf -d main | head -10 Dynamic section at offset 0xdd8 contains 29 entries: Tag Type Name/Value 0x0000000000000001 (NEEDED) Shared library: [libbar.so.1.0.0] 0x0000000000000001 (NEEDED) Shared library: [libfoo.so.1.0.0] 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] 0x000000000000000c (INIT) 0x400500 main app still linked with old libbar, fails readelf -d lib/libbar.so.1.0.1 | head -10 Dynamic section at offset 0x2d98 contains 30 entries: Tag Type Name/Value 0x0000000000000001 (NEEDED) Shared library: [libfoo.so.1.0.2] 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] 0x000000000000000e (SONAME) Library soname: [libbar.so.1.0.1] 0x000000000000000f (RPATH) Library rpath: [$ORIGIN] new libbar.so.1.0.1 needs libfoo.so.1.0.2 rebuild main app g++ --std=c++11 -Ifooapi -Ibarapi main.cpp -o main -Llib -lbar -lfoo /usr/bin/ld: warning: libfoo.so.1.0.0, needed by lib/libbar.so, not found (try using -rpath or -rpath-link) Update libbar so links cd lib; rm libbar.so.1; rm libbar.so; ln -s libbar.so.1.0.1 libbar.so.1; ln -s libbar.so.1 libbar.so; cd .. total 80 -rwxrwxr-x. 1 amd amd 20120 Sep 4 11:16 hide_libfoo.so.1.0.0 lrwxrwxrwx. 1 amd amd 11 Sep 4 13:20 libbar.so -> libbar.so.1 lrwxrwxrwx. 1 amd amd 15 Sep 4 13:20 libbar.so.1 -> libbar.so.1.0.1 -rwxrwxr-x. 1 amd amd 20160 Sep 4 11:47 libbar.so.1.0.0 -rwxrwxr-x. 1 amd amd 20160 Sep 4 13:15 libbar.so.1.0.1 lrwxrwxrwx. 1 amd amd 11 Sep 4 13:06 libfoo.so -> libfoo.so.1 lrwxrwxrwx. 1 amd amd 15 Sep 4 13:06 libfoo.so.1 -> libfoo.so.1.0.2 -rwxrwxr-x. 1 amd amd 20120 Sep 4 11:23 libfoo.so.1.0.2 libbar.so points to the latest, libfoo.so points to what libbar needs rebuild main app g++ --std=c++11 -Ifooapi -Ibarapi main.cpp -o main -Llib -lbar -lfoo It worked ldd main linux-vdso.so.1 => (0x00007ffc04bfb000) libbar.so.1.0.1 => not found libfoo.so.1.0.2 => not found libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007f7803266000) libm.so.6 => /lib64/libm.so.6 (0x00007f7802f64000) libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f7802d4e000) libc.so.6 => /lib64/libc.so.6 (0x00007f7802981000) /lib64/ld-linux-x86-64.so.2 (0x00007f780356d000) LD_LIBRARY_PATH=lib ldd main linux-vdso.so.1 => (0x00007ffe838c8000) libbar.so.1.0.1 => lib/libbar.so.1.0.1 (0x00007f9141780000) libfoo.so.1.0.2 => lib/libfoo.so.1.0.2 (0x00007f914157c000) libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007f9141275000) libm.so.6 => /lib64/libm.so.6 (0x00007f9140f73000) libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f9140d5d000) libc.so.6 => /lib64/libc.so.6 (0x00007f9140990000) /lib64/ld-linux-x86-64.so.2 (0x00007f9141984000) Shows main using correct versions of libs LD_LIBRARY_PATH=lib ./main foo 2 doimpl 10 version 2 foo foo 2 doimpl 20 version 2 foo bar doimpl 20 version 1 bar Note libfoo version 2 got called by bar How to make updates to foo so libbar doesn't need to be recompiled use correct soname spec build libfoo change just libfile names g++ -fPIC -fvisibility=hidden -shared -Wl,-soname,libfoo.so.1 -o lib.so/libfoo.so.1.0.0 fooapi/foo.o cd lib.so; ln -s libfoo.so.1.0.0 libfoo.so.1; ln -s libfoo.so.1 libfoo.so; cd .. g++ -fPIC -fvisibility=hidden -shared -Wl,-soname,libbar.so.1 -Wl,-rpath,$ORIGIN -o lib.so/libbar.so.1.0.0 barapi/bar.o -Llib.so -lfoo ldd lib.so/libbar.so.1.0.0 linux-vdso.so.1 => (0x00007ffc2a17c000) libfoo.so.1 => /datadisk/git-repos/sharedlib/lib.so/libfoo.so.1 (0x00007f46b803e000) libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007f46b7d37000) libm.so.6 => /lib64/libm.so.6 (0x00007f46b7a35000) libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f46b781f000) libc.so.6 => /lib64/libc.so.6 (0x00007f46b7452000) /lib64/ld-linux-x86-64.so.2 (0x00007f46b8446000) Note libbar only depends on libfoo.so.1 not libfoo.so.1.0.0, last 2 digits dont care Build main /usr/bin/ld: cannot find -lbar collect2: error: ld returned 1 exit status cd lib.so; ln -s libbar.so.1.0.0 libbar.so.1; ln -s libbar.so.1 libbar.so; cd .. g++ --std=c++11 -Ifooapi -Ibarapi main.cpp -o main -Llib.so -lbar -lfoo ldd main linux-vdso.so.1 => (0x00007ffec730a000) libbar.so.1 => not found libfoo.so.1 => not found libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007f2547558000) libm.so.6 => /lib64/libm.so.6 (0x00007f2547256000) libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f2547040000) libc.so.6 => /lib64/libc.so.6 (0x00007f2546c73000) /lib64/ld-linux-x86-64.so.2 (0x00007f254785f000) note the lib versions conform to soname spec LD_LIBRARY_PATH=lib.so ./main foo doimpl 10 version 1 foo foo doimpl 20 version 1 foo bar doimpl 20 version 1 bar Now update libfoo g++ -fPIC -fvisibility=hidden -shared -Wl,-soname,libfoo.so.1 -o lib.so/libfoo.so.1.0.2 fooapir2/foo.o keep soname_spec compatible but filename changed ls -l lib.so total 60 lrwxrwxrwx. 1 amd amd 11 Sep 4 13:34 libbar.so -> libbar.so.1 lrwxrwxrwx. 1 amd amd 15 Sep 4 13:34 libbar.so.1 -> libbar.so.1.0.0 -rwxrwxr-x. 1 amd amd 20160 Sep 4 13:31 libbar.so.1.0.0 lrwxrwxrwx. 1 amd amd 11 Sep 4 13:30 libfoo.so -> libfoo.so.1 lrwxrwxrwx. 1 amd amd 15 Sep 4 13:30 libfoo.so.1 -> libfoo.so.1.0.0 -rwxrwxr-x. 1 amd amd 20120 Sep 4 13:29 libfoo.so.1.0.0 -rwxrwxr-x. 1 amd amd 20120 Sep 4 13:37 libfoo.so.1.0.2 rerun main foo doimpl 10 version 1 foo foo doimpl 20 version 1 foo bar doimpl 20 version 1 bar it worked but did not use updated libfoo version 2 update libfoo.so.1 soname link to point to lated cd lib.so; rm libfoo.so.1; ln -s libfoo.so.1.0.2 libfoo.so.1; cd .. ls -l lib.so total 60 lrwxrwxrwx. 1 amd amd 11 Sep 4 13:34 libbar.so -> libbar.so.1 lrwxrwxrwx. 1 amd amd 15 Sep 4 13:34 libbar.so.1 -> libbar.so.1.0.0 -rwxrwxr-x. 1 amd amd 20160 Sep 4 13:31 libbar.so.1.0.0 lrwxrwxrwx. 1 amd amd 11 Sep 4 13:30 libfoo.so -> libfoo.so.1 lrwxrwxrwx. 1 amd amd 15 Sep 4 13:39 libfoo.so.1 -> libfoo.so.1.0.2 -rwxrwxr-x. 1 amd amd 20120 Sep 4 13:29 libfoo.so.1.0.0 -rwxrwxr-x. 1 amd amd 20120 Sep 4 13:37 libfoo.so.1.0.2 rerun main - does it pick new libfoo LD_LIBRARY_PATH=lib.so ./main foo 2 doimpl 10 version 2 foo foo 2 doimpl 20 version 2 foo bar doimpl 20 version 1 bar yes foo 2 no need to rebuild libbar or main with updated libfoo as it was compatible
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