From 965d2feeddd4bb672396e620b8c2f402f7bb99d6 Mon Sep 17 00:00:00 2001
From: Daniel Dunbar <daniel@zuster.org>
Date: Sat, 5 Nov 2011 06:30:03 +0000
Subject: build/cmake: Enable initial llvm-build integration.  - Generates the
 llvm-config-2 LibraryDependencies.inc file.  - Generates dependency
 information so that cmake will automatically reconfigure    when
 LLVMBuild.txt files are changed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143793 91177308-0d34-0410-b5e6-96231b3b80d8
---
 CMakeLists.txt | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

(limited to 'CMakeLists.txt')

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 616330f571..2a5a33a1f1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -214,6 +214,54 @@ if( NOT PYTHONINTERP_FOUND )
 Please install Python or specify the PYTHON_EXECUTABLE CMake variable.")
 endif()
 
+######
+# LLVMBuild Integration
+#
+# We use llvm-build to generate all the data required by the CMake based
+# build system in one swoop:
+#
+#  - We generate a file (a CMake fragment) in the object root which contains
+#    all the definitions that are required by CMake.
+#
+#  - We generate the library table used by llvm-config.
+#
+#  - We generate the dependencies for the CMake fragment, so that we will
+#    automatically reconfigure outselves.
+
+set(LLVMBUILDTOOL "${LLVM_MAIN_SRC_DIR}/utils/llvm-build/llvm-build")
+set(LLVMCONFIGLIBRARYDEPENDENCIESINC
+  "${LLVM_BINARY_DIR}/tools/llvm-config-2/LibraryDependencies.inc")
+set(LLVMBUILDCMAKEFRAG
+  "${LLVM_BINARY_DIR}/LLVMBuild.cmake")
+message(STATUS "Constructing LLVMBuild project information")
+execute_process(
+  COMMAND ${PYTHON_EXECUTABLE} ${LLVMBUILDTOOL}
+            --write-library-table ${LLVMCONFIGLIBRARYDEPENDENCIESINC}
+            --write-cmake-fragment ${LLVMBUILDCMAKEFRAG}
+            ERROR_VARIABLE LLVMBUILDOUTPUT
+            ERROR_VARIABLE LLVMBUILDERRORS
+            OUTPUT_STRIP_TRAILING_WHITESPACE
+            ERROR_STRIP_TRAILING_WHITESPACE
+  RESULT_VARIABLE LLVMBUILDRESULT)
+
+# On Win32, CMake doesn't properly handle piping the default output/error
+# streams into the GUI console. So, we explicitly catch and report them.
+if( NOT "${LLVMBUILDOUTPUT}" STREQUAL "")
+  message(STATUS "llvm-build output: ${LLVMBUILDOUTPUT}")
+endif()
+if( NOT "${LLVMBUILDRESULT}" STREQUAL "0" )
+  message(FATAL_ERROR
+    "Unexpected failure executing llvm-build: ${LLVMBUILDERRORS}")
+endif()
+
+# Include the generated CMake fragment. This will define properties from the
+# LLVMBuild files in a format which is easy to consume from CMake, and will add
+# the dependencies so that CMake will reconfigure properly when the LLVMBuild
+# files change.
+include(${LLVMBUILDCMAKEFRAG})
+
+######
+
 # Configure all of the various header file fragments LLVM uses which depend on
 # configuration variables.
 set(LLVM_ENUM_ASM_PRINTERS "")
-- 
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