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find_first_existing_vc_file("${LLVM_MAIN_SRC_DIR}" llvm_vc)

# The VC revision include that we want to generate.
set(version_inc "${CMAKE_CURRENT_BINARY_DIR}/VCSRevision.h")

set(generate_vcs_version_script "${LLVM_CMAKE_PATH}/GenerateVersionFromVCS.cmake")

if(llvm_vc AND LLVM_APPEND_VC_REV)
  set(llvm_source_dir ${LLVM_MAIN_SRC_DIR})
endif()

# Create custom target to generate the VC revision include.
add_custom_command(OUTPUT "${version_inc}"
  DEPENDS "${llvm_vc}" "${generate_vcs_version_script}"
  COMMAND ${CMAKE_COMMAND} "-DNAMES=LLVM"
                           "-DLLVM_SOURCE_DIR=${llvm_source_dir}"
                           "-DHEADER_FILE=${version_inc}"
                           -P "${generate_vcs_version_script}")

# Mark the generated header as being generated.
set_source_files_properties("${version_inc}"
  PROPERTIES GENERATED TRUE
             HEADER_FILE_ONLY TRUE)

add_custom_target(llvm_vcsrevision_h DEPENDS "${version_inc}")
set_target_properties(llvm_vcsrevision_h PROPERTIES FOLDER "Misc")