commit 5db0ae4d384175839fe274fbcc1cb120e79fe43d
author Jonas Hahnfeld <hahnjo@hahnjo.de> Wed Nov 08 14:31:51 2017 +0000
committer Jonas Hahnfeld <hahnjo@hahnjo.de> Wed Nov 08 14:31:51 2017 +0000
tree 4a2fb341920d6e1872d9267bf87af8f09829bae0
parent 86f971ccd6448264675ee005462bb5488542c903

[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

llvm-svn: 317694

llvm/cmake/modules/CrossCompile.cmake

diff --git a/llvm/cmake/modules/CrossCompile.cmake b/llvm/cmake/modules/CrossCompile.cmake
index b0726ebd..ff092b2 100644
--- a/llvm/cmake/modules/CrossCompile.cmake
+++ b/llvm/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}