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add_library: Document object library portability suggestion 

Xcode and VS <= 7.1 will not build targets that have no source files
besides $<TARGET_OBJECTS:...>.  Suggest in the documentation that
projects always add at least one real source file.
This commit is contained in:
Brad King 2013-01-04 09:38:22 -05:00
parent 2c4969a131
commit 51988a4f91
1 changed files with 4 additions and 0 deletions
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4
Source/cmAddLibraryCommand.h
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@ -134,6 +134,10 @@ public:
"They may contain custom commands generating such sources, but not "
"PRE_BUILD, PRE_LINK, or POST_BUILD commands. "
"Object libraries cannot be imported, exported, installed, or linked."
" "
"Some native build systems may not like targets that have only "
"object files, so consider adding at least one real source file "
"to any target that references $<TARGET_OBJECTS:objlib>."
;
}