shared-libraries

Say I have a.so and b.so. Can I produce c.so as a single shared library with all the functions exported by a and b, of course resolving all intra-dependencies (i.e. all functions of b.so called by a.so and the other way around)? I tried gcc -shared -Wl,soname,c.so -o c.so a.so b.so but it doesn't work. Same goes if I archive a.o and b.o in a.a and b.a (which shouldn't modify a.o and b.o), and do gcc -shared -Wl,soname,c.so -o c.so a.a b.a Thanks Merging multiple shared libraries into one is indeed practically impossible on all UNIXen, except AIX: the linker considers the .so a "final" product.

I know that global variables are bad. But if I am using node's module "util" in 40 files in my framework, isn't it better to just declare it as a global variable like: util = require('util'); in the index.js file instead of writing that line in 40 files? Cause I often use the same 5-10 modules in each file, that would save a lot of time instead of copy paste all the time. Isn't DRY good in this case? Each module is supposed to be independent. The require doesn't cost anything anyways after the first one for each module. What if you wanted to test one module alone? You'd be having a lot of

I am trying to build an android application that calls into a C++ backend. This backend uses ZeroMQ for messaging. Per the android build page on the ZeroMQ guide, I have built a native toolchain of ndk version 6 and used that to (successfully) build ZeroMQ. However, when I build my own .so with the JNI implementations, I can't seem to make everything load properly. Specifically, if I call System.LoadLibrary("zmq") , this completes successfully, but if I then call *System.LoadLibrary("my_lib")* I always get an UnsatisfiedLinkError complaining that: Cannot load library reloc_library[1244]: 29

I am trying to build a shared library. Let us say libabc.so .It uses another .so file , say lib123.so (a lib in /usr/local/lib) .Now i am using my shared lib libabc.so in my application. say my-app.I want to know how i should link these binaries??i don't want to link my-app with lib123.so directly. my-app should be linked with only libabc.so. How can i do this? Thanks in advance. I am using g++ compiler Suppose that libabc.so is obtained from posiition independent object code files abc1.pic.o and abc2.pic.o ; then you have built them with e.g. gcc -Wall -fPIC -O -g abc1.c -c -o abc1.pic.o gcc

I'd like to know which libraries are used by executables on my system. More specifically, I'd like to rank which libraries are used the most, along with the binaries that use them. How can I do this? John Vasileff Use ldd to list shared libraries for each executable. Cleanup the output Sort, compute counts, sort by count To find the answer for all executables in the "/bin" directory: find /bin -type f -perm /a+x -exec ldd {} \; \ | grep so \ | sed -e '/^[^\t]/ d' \ | sed -e 's/\t//' \ | sed -e 's/.*=..//' \ | sed -e 's/ (0.*)//' \ | sort \ | uniq -c \ | sort -n Change "/bin" above to "/" to