GCC Linker Warning/Error - *.so needed by *.so not found

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In my case there are 2 .so and an .exe,

A.so

B.so depends on A.so

output.exe depends on B.so

Both A.so and B.so are built fine. However I have this warning (and 3 errors) when building output.exe:

warning: libA.so.1, needed by ../../../out/bin/lib64/libB.so, not found (try using -rpath or -rpath-link)
../lib64/libB.so: undefined reference to 'foo()'

The linker flag of B.so is:

g++ ... -o libB.so.1.0.0 -Wl,-soname,libB.so.1 -L../../out/bin/lib64 -lA

The linker flags of output.exe is:

g++ ... -o Output.exe -Wl,-rpath,'$ORIGIN' -L../../out/bin/lib64 -lB

The warning and error go away if I add -lA to linker flag of output.exe. My question are:

1. Do I really need to link A.so to the exe? Even I've already linked the A.so to B.so when producing B.so?


2. Why am I getting undefined reference to foo()? It is a global function in A.so. Declaration:

void foo()

GCC version: 4.7.2

Thank you!

asked 1 min ago

Wilson

124

GCC Linker Warning/Error - *.so needed by *.so not found