TableGen.cmake: sometimes the .td file is not in the current directory

(clang/include/clang/Basic/StmtNodes.td, for instance, is tablegenned
from clang/include/clang/AST/CMakeLists.txt) so it is not contained on
the list of all .td files on the current source directory which is
used as the DEPENDS of the custom command. We must add the .td file to
the DEPENDS list of the custom command. Otherwise some .inc files are
not regenerated when the corresponding .td file changes.

llvm-svn: 122768

1 files changed, 4 insertions, 1 deletions

diff --git a/llvm/cmake/modules/TableGen.cmake b/llvm/cmake/modules/TableGen.cmake
index e61a3427cc2..c1a11b34261 100644
--- a/llvm/cmake/modules/TableGen.cmake
+++ b/llvm/cmake/modules/TableGen.cmake
@@ -18,7 +18,10 @@ macro(tablegen ofn)
     -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}
+    # The file in LLVM_TARGET_DEFINITIONS may be not in the current
+    # directory and local_tds may not contain it, so we must
+    # explicitly list it here:
+    DEPENDS tblgen ${local_tds} ${global_tds} ${LLVM_TARGET_DEFINITIONS_ABSOLUTE}
     COMMENT "Building ${ofn}..."
     )
   add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${ofn}