[PATCH][CMAKE] llvm_add_library: enable explicit OBJECT "library" target

[Axel Naumann via llvm-commits]

Hi,

Re-using llvm_add_library and trying to build a shared lib from a set of
static libs' .o-s I ran into a small limitation: I cannot tell
llvm_add_library to generate the OBJECT target. I really don't want to
build SHARED (which would be a work-around).

The attached, tiny patch allows me to write

add_clang_library(clingUtils WITHOBJECT
  AST.cpp
)

and in libcling.so's CMakeLists.txt:

set(SOURCES
  $<TARGET_OBJECTS:obj.clingInterpreter>
  $<TARGET_OBJECTS:obj.clingMetaProcessor>
  $<TARGET_OBJECTS:obj.clingUtils>
  )

Is this patch okay? (I might still have commit perms.)

Cheers, Axel.

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