[llvm-commits] [llvm] r59763 - /llvm/trunk/cmake/modules/TableGen.cmake

[Oscar Fuentes]

Author: ofv
Date: Thu Nov 20 18:18:45 2008
New Revision: 59763

URL: http://llvm.org/viewvc/llvm-project?rev=59763&view=rev
Log:
CMake: Do not rebuild the world when tblgen changes but the .inc files
it produces are not affected by the change.

Modified:
    llvm/trunk/cmake/modules/TableGen.cmake

Modified: llvm/trunk/cmake/modules/TableGen.cmake
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/cmake/modules/TableGen.cmake?rev=59763&r1=59762&r2=59763&view=diff

==============================================================================
--- llvm/trunk/cmake/modules/TableGen.cmake (original)
+++ llvm/trunk/cmake/modules/TableGen.cmake Thu Nov 20 18:18:45 2008
@@ -4,9 +4,16 @@
 
 macro(tablegen ofn)
   file(GLOB all_tds "*.td")
+  add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp
+    COMMAND ${LLVM_TABLEGEN} ${ARGN} -I ${CMAKE_CURRENT_SOURCE_DIR}
+    -I ${LLVM_MAIN_SRC_DIR}/lib/Target -I ${LLVM_MAIN_INCLUDE_DIR}
+    ${CMAKE_CURRENT_SOURCE_DIR}/${LLVM_TARGET_DEFINITIONS} -o ${ofn}.tmp
+    DEPENDS ${LLVM_TABLEGEN} ${all_tds}
+    COMMENT "Building ${ofn}.tmp..."
+    )
   add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${ofn}
-    COMMAND ${LLVM_TABLEGEN} ${ARGN} -I ${CMAKE_CURRENT_SOURCE_DIR} -I ${LLVM_MAIN_SRC_DIR}/lib/Target -I ${LLVM_MAIN_INCLUDE_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/${LLVM_TARGET_DEFINITIONS} -o ${ofn}
-    DEPENDS tblgen ${all_tds}
+    COMMAND ${CMAKE_COMMAND} -E copy_if_different ${ofn}.tmp ${ofn}
+    DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp
     COMMENT "Building ${ofn}..."
     )
   set(TABLEGEN_OUTPUT ${TABLEGEN_OUTPUT} ${CMAKE_CURRENT_BINARY_DIR}/${ofn})