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Teach CMake to only touch tablegen-generated files if anything

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actually changed.

Patch by Frits van Bommel!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117102 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Oscar Fuentes 2010-10-22 16:20:10 +00:00
parent eecb858ca8
commit 8a116e0b3e
1 changed files with 10 additions and 1 deletions
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11
cmake/modules/TableGen.cmake
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@ -13,10 +13,19 @@ macro(tablegen ofn)
${CMAKE_CURRENT_SOURCE_DIR}/${LLVM_TARGET_DEFINITIONS})
endif()
add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${ofn}
# 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}
-o ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp
# 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}..."
)