[libomptarget] Added install component for libomptarget

[vzakhari]

Summary

Allow selective install of libomptarget

[Hahnfeld]

Can you explain the benefit of this change? I would have expected a target like install-omptarget, but applying this patch locally didn't change anything visible.

Also, please submit your patch with full context according to LLVM's documentation: https://www.llvm.org/docs/Phabricator.html#requesting-a-review-via-the-web-interface

[vzakhari]

In D56108#1341746, @Hahnfeld wrote:

Can you explain the benefit of this change? I would have expected a target like install-omptarget, but applying this patch locally didn't change anything visible.

This change allows running cmake as:
cmake -DCMAKE_INSTALL_COMPONENT=omptarget -P cmake_install.cmake
which will install only libomptarget and no other components. This command allows installing only selected/required components instead of installing everyting that was built.

Also, please submit your patch with full context according to LLVM's documentation: https://www.llvm.org/docs/Phabricator.html#requesting-a-review-via-the-web-interface

Sorry for that. I uploaded it the right way this time.

[Hahnfeld]

Thanks for the explanation, that sounds useful.

libomptarget/src/CMakeLists.txt

   "-Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/exports")
 
 # Install libomptarget under the lib destination folder.
-install(TARGETS omptarget LIBRARY DESTINATION "${OPENMP_INSTALL_LIBDIR}")
+install(TARGETS omptarget LIBRARY COMPONENT omptarget
+  DESTINATION "${OPENMP_INSTALL_LIBDIR}")