[llvm] r317694 - [CMake] Add custom target to create build directory

[Jonas Hahnfeld via llvm-commits]

Author: hahnfeld
Date: Wed Nov  8 06:31:51 2017
New Revision: 317694

URL: http://llvm.org/viewvc/llvm-project?rev=317694&view=rev
Log:
[CMake] Add custom target to create build directory

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.

Differential Revision: https://reviews.llvm.org/D39298

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

Modified: llvm/trunk/cmake/modules/CrossCompile.cmake
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/cmake/modules/CrossCompile.cmake?rev=317694&r1=317693&r2=317694&view=diff
==============================================================================
--- llvm/trunk/cmake/modules/CrossCompile.cmake (original)
+++ llvm/trunk/cmake/modules/CrossCompile.cmake Wed Nov  8 06:31:51 2017
@@ -16,12 +16,15 @@ function(llvm_create_cross_target_intern
     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}