On 12/09/2014 12:26 PM, J. Caleb Wherry wrote:
> add_library(ExtLib SHARED IMPORTED)
> set_property(TARGET ExtLib PROPERTY IMPORTED_LOCATION
> "${CMAKE_BINARY_DIR}/${EXT_LIB_NAME}")
> add_dependencies(ExtLib ExtLibBuild)
Thanks for the complete/simple example. The problem is that
the libExtLib.so file built by the external project does not
have DT_SONAME set by the linker. When a linker is given a
path to a shared library file that has no soname then the path
is copied into the DT_NEEDED field of the consumer since it
has no soname to use for that.
There are two solutions:
1. Make sure DT_SONAME gets set properly by the external build system.
2. Tell CMake that the imported library file has no soname:
set_property(TARGET ExtLib PROPERTY IMPORTED_NO_SONAME 1)
CMake will then link it via -lExtLib and the linker will not
store the path to the file in DT_NEEDED but only the file name.
Either of these should resolve the issue. Number 1 is cleaner.
-Brad
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