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[CMake] Fix Xcode build with LLVM_ENABLE_OBJLIB.

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This amends chapuni's r246156 to handle an Xcode quirk, one even called out
in the CMake documentation:

    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>.

I've limited the scope of this hack to Xcode for now.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@247305 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jordan Rose 2015-09-10 17:18:51 +00:00
parent 40b623b147
commit a72d302556
2 changed files with 7 additions and 0 deletions
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1
cmake/dummy.cpp Normal file
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@ -0,0 +1 @@
typedef int dummy;

6
cmake/modules/AddLLVM.cmake
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@ -590,6 +590,12 @@ macro(add_llvm_executable name)
add_windows_version_resource_file(ALL_FILES ${ALL_FILES})
if(XCODE)
# Note: the dummy.cpp source file provides no definitions. However,
# it forces Xcode to properly link the static library.
list(APPEND ALL_FILES "${LLVM_SOURCE_DIR}/cmake/dummy.cpp")
endif()
if( EXCLUDE_FROM_ALL )
add_executable(${name} EXCLUDE_FROM_ALL ${ALL_FILES})
else()