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add_library: mention that Xcode requires a real source file

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The docs mentioned that it happened, but not when. Mention Xcode since
it is the culprit today.

See #16524.
This commit is contained in:
Ben Boeckel
2017-12-01 10:36:01 -05:00
parent a4faf86387
commit 4c40ab261c
1 changed files with 3 additions and 3 deletions
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Help/command/add_library.rst
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@@ -111,9 +111,9 @@ may contain only sources that compile, header files, and other files
that would not affect linking of a normal library (e.g. ``.txt``). that would not affect linking of a normal library (e.g. ``.txt``).
They may contain custom commands generating such sources, but not They may contain custom commands generating such sources, but not
``PRE_BUILD``, ``PRE_LINK``, or ``POST_BUILD`` commands. Object libraries ``PRE_BUILD``, ``PRE_LINK``, or ``POST_BUILD`` commands. Object libraries
cannot be linked. Some native build systems may not like targets that cannot be linked. Some native build systems (such as Xcode) may not like
have only object files, so consider adding at least one real source file targets that have only object files, so consider adding at least one real
to any target that references ``$<TARGET_OBJECTS:objlib>``. source file to any target that references ``$<TARGET_OBJECTS:objlib>``.
Alias Libraries Alias Libraries
^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^