[lit] Make lit-lldb-init configurable by CMake

This makes the `lit-lldb-init` file configurable by CMake. This matters
to us downstream in Swift, where we want to set environment variables
with the `env` command for every test.

Differential revision: https://reviews.llvm.org/D63679

llvm-svn: 364112

Author: JDevlieghere

lldb/lit/CMakeLists.txt

@@ -81,6 +81,10 @@ configure_lit_site_cfg(
   ${CMAKE_CURRENT_SOURCE_DIR}/Suite/lit.site.cfg.in
   ${CMAKE_CURRENT_BINARY_DIR}/Suite/lit.site.cfg)
 
+configure_file(
+  ${CMAKE_CURRENT_SOURCE_DIR}/lit-lldb-init.in
+  ${CMAKE_CURRENT_BINARY_DIR}/lit-lldb-init)
+
 if(NOT LLDB_BUILT_STANDALONE)
   list(APPEND LLDB_TEST_DEPS
     FileCheck

lldb/lit/helper/toolchain.py

@@ -38,12 +38,12 @@ def use_lldb_substitutions(config):
         ToolSubst('%lldb',
                   command=FindTool('lldb'),
                   extra_args=['--no-lldbinit', '-S',
-                              os.path.join(config.test_source_root,
+                              os.path.join(config.test_exec_root,
                                            'lit-lldb-init')]),
         ToolSubst('%lldb-init',
                   command=FindTool('lldb'),
                   extra_args=['-S',
-                              os.path.join(config.test_source_root,
+                              os.path.join(config.test_exec_root,
                                            'lit-lldb-init')]),
         lldbmi,
         ToolSubst('%debugserver',