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This module allows to add binary files into UHD (e.g., for cal data
storage) in a platform-independent way.
The upstream CMakeRC.cmake is modified in the following way to allow
linkage against a shared object:
```diff
# Generate the actual static library. Each source file is just a single file
# with a character array compiled in containing the contents of the
# corresponding resource file.
add_library(${name} STATIC ${libcpp})
set_property(TARGET ${name} PROPERTY CMRC_LIBDIR "${libdir}")
set_property(TARGET ${name} PROPERTY CMRC_NAMESPACE "${ARG_NAMESPACE}")
target_link_libraries(${name} PUBLIC cmrc::base)
set_property(TARGET ${name} PROPERTY CMRC_IS_RESOURCE_LIBRARY TRUE)
+ set_property(TARGET ${name} PROPERTY POSITION_INDEPENDENT_CODE ON)
```
This forces the -fPIC flag for the static object that CMakeRC generates,
allowing to link it into a shared object file.
The version of CMakeRC used is: a7e355290, cloned from
git@github.com:vector-of-bool/cmrc.git.
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