[PATCH] Fix tablegen cmake rule.

[Reid Kleckner]

TableGen is supposed to ensure that the output file is deleted after a non-zero exit, even if it crashes. See lib/TableGen/Main.cpp and look for tool_output_file. Is our signal handler failing somehow? It might be worth debugging that. I know the signal handler is already super async-unsafe, but we should be able to limp along well enough to delete an output file.


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Comment at: cmake/modules/TableGen.cmake:31-32
@@ -30,3 +30,4 @@
     ${LLVM_TARGET_DEFINITIONS_ABSOLUTE}
-    -o ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp
+    -o ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp ||
+    { rm -f ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp && false \; }
     # The file in LLVM_TARGET_DEFINITIONS may be not in the current
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I would be surprised if this shell expression works on Windows. =/

http://reviews.llvm.org/D9608

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