Documentation Development GCC Tools Beat
Implicit DSO Linking Key points:
- ld will no longer automatically search in the dependencies of linked objects.
- If your project used both A and B, it will not compile unless A and B are both explicitly linked.
- There are more explanations on the Features page.
Under the new changes, if your package fails ti build with a message like:
/usr/bin/ld: gpx-parser.o: undefined reference to symbol 'acos@@GLIBC_2.0' /usr/bin/ld: note: 'acos@@GLIBC_2.0' is defined in DSO /lib/libm.so.6 so try adding it to the linker command line
Then you the line that builds the specified .o needs to explicitly link libm.
More examples are here