[llvm] r177938 - Introduce a tiny CMake project to gather Subversion revision information and place it into a header.

[Douglas Gregor]

Author: dgregor
Date: Mon Mar 25 18:14:19 2013
New Revision: 177938

URL: http://llvm.org/viewvc/llvm-project?rev=177938&view=rev
Log:
Introduce a tiny CMake project to gather Subversion revision information and place it into a header.

Added:
    llvm/trunk/cmake/modules/GetSVN.cmake

Added: llvm/trunk/cmake/modules/GetSVN.cmake
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/cmake/modules/GetSVN.cmake?rev=177938&view=auto
==============================================================================
--- llvm/trunk/cmake/modules/GetSVN.cmake (added)
+++ llvm/trunk/cmake/modules/GetSVN.cmake Mon Mar 25 18:14:19 2013
@@ -0,0 +1,25 @@
+# CMake project that writes Subversion revision information to a header.
+#
+# Input variables:
+#   FIRST_SOURCE_DIR  - First source directory
+#   FIRST_REPOSITORY  - The macro to define to the first revision number.
+#   SECOND_SOURCE_DIR - Second source directory
+#   SECOND_REPOSITORY - The macro to define to the second revision number.
+#   HEADER_FILE       - The header file to write
+include(FindSubversion)
+if (Subversion_FOUND AND EXISTS "${FIRST_SOURCE_DIR}/.svn")
+  # Repository information for the first repository.
+  Subversion_WC_INFO(${FIRST_SOURCE_DIR} MY)
+  file(WRITE ${HEADER_FILE}.txt "#define ${FIRST_REPOSITORY} \"${MY_WC_REVISION}\"\n")
+
+  # Repository information for the second repository.
+  if (EXISTS "${SECOND_SOURCE_DIR}/.svn")
+    Subversion_WC_INFO(${SECOND_SOURCE_DIR} MY)
+    file(APPEND ${HEADER_FILE}.txt 
+      "#define ${SECOND_REPOSITORY} \"${MY_WC_REVISION}\"\n")
+  endif ()
+
+  # Copy the file only if it has changed.
+  execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different
+    ${HEADER_FILE}.txt ${HEADER_FILE})
+endif()