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Avoid stalled file dependency when tablegenning.

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Patch by Frits van Bommel!

llvm-svn: 117113
This commit is contained in:
Oscar Fuentes 2010-10-22 17:37:42 +00:00
parent 9e988fe81e
commit b7f2510588
1 changed files with 7 additions and 5 deletions
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12
cmake/modules/TableGen.cmake
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@ -12,22 +12,24 @@ macro(tablegen ofn)
set(LLVM_TARGET_DEFINITIONS_ABSOLUTE
${CMAKE_CURRENT_SOURCE_DIR}/${LLVM_TARGET_DEFINITIONS})
endif()
add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${ofn}
add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp
# Generate tablegen output in a temporary file.
COMMAND ${LLVM_TABLEGEN_EXE} ${ARGN} -I ${CMAKE_CURRENT_SOURCE_DIR}
-I ${LLVM_MAIN_SRC_DIR}/lib/Target -I ${LLVM_MAIN_INCLUDE_DIR}
${LLVM_TARGET_DEFINITIONS_ABSOLUTE}
-o ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp
DEPENDS tblgen ${local_tds} ${global_tds}
COMMENT "Building ${ofn}..."
)
add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${ofn}
# Only update the real output file if there are any differences.
# This prevents recompilation of all the files depending on it if there
# aren't any.
COMMAND ${CMAKE_COMMAND} -E copy_if_different
${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp
${CMAKE_CURRENT_BINARY_DIR}/${ofn}
# Either way, we no longer need the temporary file.
COMMAND ${CMAKE_COMMAND} -E remove ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp
DEPENDS tblgen ${local_tds} ${global_tds}
COMMENT "Building ${ofn}..."
DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp
COMMENT ""
)
set(TABLEGEN_OUTPUT ${TABLEGEN_OUTPUT} ${CMAKE_CURRENT_BINARY_DIR}/${ofn})
set_source_files_properties(${CMAKE_CURRENT_BINARY_DIR}/${ofn}