Replace hardcoded comment at 'lit.site.cfg.in'

At the moment almost every lit.site.cfg.in contains two lines comment:

## Autogenerated by LLVM/Clang configuration.
# Do not edit!

The patch adds variable LIT_SITE_CFG_IN_HEADER, that is replaced from 
configure_lit_site_cfg with the note and some useful information.

llvm-svn: 266515

3 files changed, 6 insertions, 4 deletions

diff --git a/llvm/cmake/modules/AddLLVM.cmake b/llvm/cmake/modules/AddLLVM.cmake
index 294e39b77a8..da0182c0c19 100644
--- a/llvm/cmake/modules/AddLLVM.cmake
+++ b/llvm/cmake/modules/AddLLVM.cmake
@@ -983,6 +983,8 @@ function(configure_lit_site_cfg input output)
   set(HOST_CXX "${CMAKE_CXX_COMPILER} ${CMAKE_CXX_COMPILER_ARG1}")
   set(HOST_LDFLAGS "${CMAKE_EXE_LINKER_FLAGS}")
 
+  set(LIT_SITE_CFG_IN_HEADER  "## Autogenerated from ${input}\n## Do not edit!")
+
   configure_file(${input} ${output} @ONLY)
 endfunction()
 
diff --git a/llvm/test/Unit/lit.site.cfg.in b/llvm/test/Unit/lit.site.cfg.in
index dd8de489513..9d736f473ce 100644
--- a/llvm/test/Unit/lit.site.cfg.in
+++ b/llvm/test/Unit/lit.site.cfg.in
@@ -1,7 +1,7 @@
+@LIT_SITE_CFG_IN_HEADER@
+
 import sys
 
-## Autogenerated by LLVM/Clang configuration.
-# Do not edit!
 config.llvm_src_root = "@LLVM_SOURCE_DIR@"
 config.llvm_obj_root = "@LLVM_BINARY_DIR@"
 config.llvm_tools_dir = "@LLVM_TOOLS_DIR@"
diff --git a/llvm/test/lit.site.cfg.in b/llvm/test/lit.site.cfg.in
index 13f5372ef7e..47699e25840 100644
--- a/llvm/test/lit.site.cfg.in
+++ b/llvm/test/lit.site.cfg.in
@@ -1,7 +1,7 @@
+@LIT_SITE_CFG_IN_HEADER@
+
 import sys
 
-## Autogenerated by LLVM/Clang configuration.
-# Do not edit!
 config.host_triple = "@LLVM_HOST_TRIPLE@"
 config.target_triple = "@TARGET_TRIPLE@"
 config.llvm_src_root = "@LLVM_SOURCE_DIR@"