[PATCH] D39298: [CMake] Add custom target to create build directory

[Jonas Hahnfeld via Phabricator via llvm-commits]

Hahnfeld created this revision.
Herald added a subscriber: mgorny.

CMake does a poor job in tracking dependencies on files and directories
directly. Create custom target similar to the configuration step.
On my system, this avoids the reconfiguration on each build.


https://reviews.llvm.org/D39298

Files:
  cmake/modules/CrossCompile.cmake


Index: cmake/modules/CrossCompile.cmake
===================================================================
--- cmake/modules/CrossCompile.cmake
+++ cmake/modules/CrossCompile.cmake
@@ -16,12 +16,15 @@
     COMMAND ${CMAKE_COMMAND} -E make_directory ${LLVM_${target_name}_BUILD}
     COMMENT "Creating ${LLVM_${target_name}_BUILD}...")
 
+  add_custom_target(CREATE_LLVM_${target_name}
+                    DEPENDS ${LLVM_${target_name}_BUILD})
+
   add_custom_command(OUTPUT ${LLVM_${target_name}_BUILD}/CMakeCache.txt
     COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}"
         ${CROSS_TOOLCHAIN_FLAGS_${target_name}} ${CMAKE_SOURCE_DIR}
         -DLLVM_TARGET_IS_CROSSCOMPILE_HOST=TRUE
     WORKING_DIRECTORY ${LLVM_${target_name}_BUILD}
-    DEPENDS ${LLVM_${target_name}_BUILD}
+    DEPENDS CREATE_LLVM_${target_name}
     COMMENT "Configuring ${target_name} LLVM...")
 
   add_custom_target(CONFIGURE_LLVM_${target_name}


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