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Help: Add note about restoring pre-3.0 link libraries genex behavior

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Brad King 2014-10-10 10:48:05 -04:00
parent 5ab9aa62fe
commit 8bd81981ad
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Help/release/dev/note-link-libraries-genex.rst Normal file
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note-link-libraries-genex
-------------------------
* In CMake 3.0 the :command:`target_link_libraries` command
accidentally began allowing unquoted arguments to use
:manual:`generator expressions <cmake-generator-expressions(7)>`
containing a (``;`` separated) list within them. For example::
set(libs B C)
target_link_libraries(A PUBLIC $<BUILD_INTERFACE:${libs}>)
This is equivalent to writing::
target_link_libraries(A PUBLIC $<BUILD_INTERFACE:B C>)
and was never intended to work. It did not work in CMake 2.8.12.
Such generator expressions should be in quoted arguments::
set(libs B C)
target_link_libraries(A PUBLIC "$<BUILD_INTERFACE:${libs}>")
CMake 3.1 again requires the quotes for this to work correctly.