Summary:
When doing standalone builds, you could potentially be building against
an llvm which also built lldb. If this were the case, you'd be
attempting to build this target twice.
Reviewers: xiaobai
Subscribers: mgorny
Differential Revision: https://reviews.llvm.org/D64847
llvm-svn: 366394
-set(LLVM_LINK_COMPONENTS Support)
-
-add_tablegen(lldb-tblgen LLDB
- LLDBOptionDefEmitter.cpp
- LLDBTableGen.cpp
- )
-set_target_properties(lldb-tblgen PROPERTIES FOLDER "LLDB tablegenning")
+# tablegen targets get exported via llvm for LLVMConfig.cmake. So standalone
+# builds of lldb can potentially import this via LLVMConfig and also attempt to
+# build it in tree. So only build it if it doesn't exist.
+if (TARGET lldb-tblgen)
+ set(LLDB_TABLEGEN_EXE $<TARGET_FILE:lldb-tblgen> CACHE STRING "")
+else()
+ set(LLVM_LINK_COMPONENTS Support)
+ add_tablegen(lldb-tblgen LLDB
+ LLDBOptionDefEmitter.cpp
+ LLDBTableGen.cpp
+ )
+ set_target_properties(lldb-tblgen PROPERTIES FOLDER "LLDB tablegenning")
+endif()