gcc - /usr/bin/ld error: cannot find <library> in /usr/local/lib though ldconfig list it, and path added to ld.so.conf
I try to compile a C++ code, using a library I've also compiled manually and installed in /usr/local/lib
The compilation of the software fails at the linking step:
/usr/bin/ld: error: cannot find -lcppdb
it seems that g++ does not search by default in /usr/local/lib , same for clang++
g++ -print-search-dirs # does not show /usr/local/lib
however the fact is /usr/local/lib is in my /etc/ld.so.conf and I did run ldconfig as root, and actually running ldconfig -p | grep cppdb shows me
libcppdb_sqlite3.so.0 (libc6) => /usr/local/lib/libcppdb_sqlite3.so.0
libcppdb_sqlite3.so (libc6) => /usr/local/lib/libcppdb_sqlite3.so
libcppdb.so.0 (libc6) => /usr/local/lib/libcppdb.so.0
libcppdb.so (libc6) => /usr/local/lib/libcppdb.so
adding the option -L/usr/local/lib of course solve the problem, but the goal is to use configuration files
Answer
ld, the linker, does not use external configuration files for that. ldconfig is for the loader, ld.so. Create a makefile if you want to set values for the linker somewhere.