I was under the impression it stood for extended, as in a more detailed interface for that particular library. For example, CreateFile with 4 parameters is the typical version and CreateFileEx with 17 is the version offering more control and finer detail over how the file is opened, what occurs if it doesn’t exist, etc, … Read more
-Wl,–no-undefined linker option can be used when building shared library, undefined symbols will be shown as linker errors. g++ -shared -Wl,-soname,libmylib.so.5 -Wl,–no-undefined \ -o libmylib.so.1.1 mylib.o -lthirdpartylib
.a is an “archive”. Although an archive can contain any type of file, in the context of the GNU toolchain, it is a library of object files (other toolchains especially on Windows use .lib for the same purpose, but the format of these is not typically a general purpose archive, and often specific to the … Read more
Make sure your LD_LIBRARY_PATH is set up to include all directories you want to search and then test it again. You can test this quickly with: LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib ffmpeg which will set it only for that invocation. Alternatively, you can edit /etc/ld.so.conf which contains the default directories searched. Some Linux distributions may not include /usr/local/lib in … Read more
soname is used to indicate what binary api compatibility your library support. SONAME is used at compilation time by linker to determine from the library file what actual target library version. gcc -lNAME will seek for libNAME.so link or file then capture its SONAME that will certainly be more specific ( ex libnuke.so links to … Read more
Does this (with appropriate -L’s of course) gcc -shared -o megalib.so foo.o bar.o -la_static_lib -lb_static_lib Not do it?
Other people are on the right track. Here are a couple ways. cat /proc/NNNN/maps | awk ‘{print $6}’ | grep ‘\.so’ | sort | uniq Or, with strace: strace CMD…. 2>&1 | grep -E ‘^open(at)?\(.*\.so’ Both of these assume that shared libraries have “.so” somewhere in their paths, but you can modify that. The first … Read more
Very frustrating that nobody actually shows a concrete solution. I had this issue after installing OpenCV. For me the easiest solution to remove this warning was actually to disable this driver: sudo ln /dev/null /dev/raw1394
The answer depends on the platform. On most platforms, if output from readelf –relocs foo.o | egrep ‘(GOT|PLT|JU?MP_SLOT)’ is empty, then either foo.o was not compiled with -fPIC, or foo.o doesn’t contain any code where -fPIC matters.
Because they are libraries. Why invent a whole new vendor-specific extension for what is exactly the same thing as their already-vendor-specific libraries?