From 088410ffc6b82be18344e278f5136f501948bc3b Mon Sep 17 00:00:00 2001
From: Stefan Granitz <stefan.graenitz@gmail.com>
Date: Fri, 7 Jun 2019 14:32:51 +0000
Subject: [PATCH] [CMake] Add special case for processing LLDB_DOTEST_ARGS

Summary:
Allow to run the test suite when building LLDB Standalone with Xcode against a provided LLVM build-tree that used a single-configuration generator like Ninja.

So far both test drivers, lit-based `check-lldb` as well as `lldb-dotest`, were looking for test dependencies (clang/dsymutil/etc.) in a subdirectory with the configuration name (Debug/Release/etc.). It was implicitly assuming that both, LLDB and the provided LLVM used the same generator. In practice, however, the opposite is quite common: build the dependencies with Ninja and LLDB with Xcode for development*. With this patch it becomes the default.

(* In fact, it turned out that the Xcode<->Xcode variant didn't even build out of the box. It's fixed since D62879)

Once this is sound, I'm planning the following steps:
* add stage to the [lldb-cmake-standalone bot](http://green.lab.llvm.org/green/view/LLDB/job/lldb-cmake-standalone/) to build and test it
* update `Building LLDB with Xcode` section in the docs
* bring the same mechanism to swift-lldb
* fade out the manually maintained Xcode project

On macOS build and test like this:
```
$ git clone https://github.com/llvm/llvm-project.git /path/to/llvm-project

$ cd /path/to/lldb-dev-deps
$ cmake -GNinja -C/path/to/llvm-project/lldb/cmake/caches/Apple-lldb-macOS.cmake -DLLVM_ENABLE_PROJECTS="clang;libcxx;libcxxabi" /path/to/llvm-project/llvm
$ ninja

$ cd /path/to/lldb-dev-xcode
$ cmake -GXcode -C/path/to/llvm-project/lldb/cmake/caches/Apple-lldb-macOS.cmake -DLLDB_BUILD_FRAMEWORK=Off -DLLVM_DIR=/path/to/lldb-dev-deps/lib/cmake/llvm -DClang_DIR=/path/to/lldb-dev-deps/lib/cmake/clang /path/to/llvm-project/lldb
$ xcodebuild -configuration Debug -target check-lldb
$ xcodebuild -configuration Debug -target lldb-dotest
$ ./Debug/bin/lldb-dotest
```

Reviewers: JDevlieghere, jingham, xiaobai, stella.stamenova, labath

Reviewed By: stella.stamenova

Subscribers: labath, mgorny, lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D62859

llvm-svn: 362803
---
 lldb/lit/CMakeLists.txt               | 28 ++++++++++++++++++++++++++-
 lldb/utils/lldb-dotest/CMakeLists.txt | 24 +++++++++++++++++++++--
 2 files changed, 49 insertions(+), 3 deletions(-)

diff --git a/lldb/lit/CMakeLists.txt b/lldb/lit/CMakeLists.txt
index f7bb423b60fb..f96fa62fd32a 100644
--- a/lldb/lit/CMakeLists.txt
+++ b/lldb/lit/CMakeLists.txt
@@ -1,6 +1,7 @@
 # Test runner infrastructure for LLDB. This configures the LLDB test trees
 # for use by Lit, and delegates to LLVM's lit test handlers.
 
+# LLVM_BUILD_MODE is used in lit.site.cfg
 if (CMAKE_CFG_INTDIR STREQUAL ".")
   set(LLVM_BUILD_MODE ".")
 else ()
@@ -12,10 +13,35 @@ if (CMAKE_SIZEOF_VOID_P EQUAL 8)
 endif()
 
 get_property(LLDB_DOTEST_ARGS GLOBAL PROPERTY LLDB_DOTEST_ARGS_PROPERTY)
+set(dotest_args_replacement ${LLVM_BUILD_MODE})
 
+if(LLDB_BUILT_STANDALONE)
+  # In paths to our build-tree, replace CMAKE_CFG_INTDIR with our configuration name placeholder.
+  string(REPLACE ${CMAKE_CFG_INTDIR} ${LLVM_BUILD_MODE} config_runtime_output_dir ${LLVM_RUNTIME_OUTPUT_INTDIR})
+  string(REPLACE ${LLVM_RUNTIME_OUTPUT_INTDIR} ${config_runtime_output_dir} LLDB_DOTEST_ARGS "${LLDB_DOTEST_ARGS}")
+
+  # Remaining ones must be paths to the provided LLVM build-tree.
+  if(LLVM_CONFIGURATION_TYPES)
+    # LLDB uses single-config; LLVM multi-config; pick one and prefer Release types.
+    # Otherwise, if both use multi-config the default is fine.
+    if(NOT CMAKE_CONFIGURATION_TYPES)
+      if(RelWithDebInfo IN_LIST LLVM_CONFIGURATION_TYPES)
+        set(dotest_args_replacement RelWithDebInfo)
+      elseif(Release IN_LIST LLVM_CONFIGURATION_TYPES)
+        set(dotest_args_replacement Release)
+      else()
+        list(GET LLVM_CONFIGURATION_TYPES 0 dotest_args_replacement)
+      endif()
+    endif()
+  else()
+    # Common case: LLVM used a single-configuration generator like Ninja.
+    set(dotest_args_replacement ".")
+  endif()
+endif()
+
+string(REPLACE ${CMAKE_CFG_INTDIR} ${dotest_args_replacement} LLDB_DOTEST_ARGS "${LLDB_DOTEST_ARGS}")
 string(REPLACE ${CMAKE_CFG_INTDIR} ${LLVM_BUILD_MODE} LLDB_LIBS_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
 string(REPLACE ${CMAKE_CFG_INTDIR} ${LLVM_BUILD_MODE} LLDB_TOOLS_DIR ${LLVM_RUNTIME_OUTPUT_INTDIR})
-string(REPLACE ${CMAKE_CFG_INTDIR} ${LLVM_BUILD_MODE} LLDB_DOTEST_ARGS "${LLDB_DOTEST_ARGS}")
 
 list(APPEND LLDB_TEST_DEPS
   LLDBUnitTests
diff --git a/lldb/utils/lldb-dotest/CMakeLists.txt b/lldb/utils/lldb-dotest/CMakeLists.txt
index d36d1a7e93de..81eeed5b6bda 100644
--- a/lldb/utils/lldb-dotest/CMakeLists.txt
+++ b/lldb/utils/lldb-dotest/CMakeLists.txt
@@ -5,8 +5,28 @@ set_target_properties(lldb-dotest PROPERTIES FOLDER "lldb utils")
 
 get_property(LLDB_DOTEST_ARGS GLOBAL PROPERTY LLDB_DOTEST_ARGS_PROPERTY)
 
-# Generate wrapper for each build mode.
-if(NOT "${CMAKE_CFG_INTDIR}" STREQUAL ".")
+# Generate lldb-dotest Python driver script for each build mode.
+if(LLDB_BUILT_STANDALONE)
+  foreach(config_type ${CMAKE_CONFIGURATION_TYPES})
+    # In paths to our build-tree, replace CMAKE_CFG_INTDIR with our actual configuration names.
+    string(REPLACE ${CMAKE_CFG_INTDIR} ${config_type} config_runtime_output_dir ${LLVM_RUNTIME_OUTPUT_INTDIR})
+    string(REPLACE ${LLVM_RUNTIME_OUTPUT_INTDIR} ${config_runtime_output_dir} LLDB_DOTEST_ARGS "${LLDB_DOTEST_ARGS}")
+
+    # Remaining ones must be paths to the provided LLVM build-tree.
+    if(${config_type} IN_LIST LLVM_CONFIGURATION_TYPES)
+      # Multi-configuration generator like Xcode (with a matching config).
+      string(REPLACE ${CMAKE_CFG_INTDIR} ${config_type} LLDB_DOTEST_ARGS "${LLDB_DOTEST_ARGS}")
+    else()
+      # Single-configuration generator like Ninja.
+      string(REPLACE ${CMAKE_CFG_INTDIR} "." LLDB_DOTEST_ARGS "${LLDB_DOTEST_ARGS}")
+    endif()
+
+    configure_file(
+      lldb-dotest.in
+      ${config_runtime_output_dir}/lldb-dotest @ONLY
+    )
+  endforeach()
+elseif(NOT "${CMAKE_CFG_INTDIR}" STREQUAL ".")
   foreach(LLVM_BUILD_MODE ${CMAKE_CONFIGURATION_TYPES})
     string(REPLACE ${CMAKE_CFG_INTDIR} ${LLVM_BUILD_MODE} LLDB_DOTEST_DIR ${LLVM_RUNTIME_OUTPUT_INTDIR})
     string(REPLACE ${CMAKE_CFG_INTDIR} ${LLVM_BUILD_MODE} LLDB_DOTEST_ARGS "${LLDB_DOTEST_ARGS}")