diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index 17426a8526..ed43e8cbb5 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -87,7 +87,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - image: ponylang/ponyc-ci-x86-64-unknown-linux-ubuntu22.04-builder:20230806
+          - image: ponylang/ponyc-ci-x86-64-unknown-linux-ubuntu22.04-builder:20230829
             name: x86-64 Linux glibc
             debugger: lldb
           - image: ponylang/ponyc-ci-x86-64-unknown-linux-musl-builder:20230808
@@ -99,6 +99,10 @@ jobs:
       image: ${{ matrix.image }}
       options: --user pony --cap-add=SYS_PTRACE --security-opt seccomp=unconfined
     steps:
+      - name: About clang
+        run: clang -v
+      - name: About cmake
+        run: cmake --version
       - name: Checkout
         uses: actions/checkout@v3
       - name: Restore Libs Cache
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7a747e82b0..6bbcacc409 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,7 +16,7 @@ if(NOT DEFINED PONYC_VERSION)
 endif()
 
 # Uncomment this to show build commands
-# set(CMAKE_VERBOSE_MAKEFILE ON)
+set(CMAKE_VERBOSE_MAKEFILE ON)
 
 # We require C++14 (because LLVM does)
 set(CMAKE_CXX_STANDARD 14)
@@ -258,6 +258,8 @@ else()
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu11 -Werror -Wconversion -Wno-sign-conversion -Wextra -Wall -Wno-unknown-warning-option ${PONY_PIC_FLAG} -fexceptions")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11 -fno-rtti ${PONY_PIC_FLAG} -fexceptions")
     add_link_options(-rdynamic)
+    set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -O0")
+    set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -O0")
 endif()
 
 if(${CMAKE_HOST_SYSTEM_NAME} MATCHES "Darwin")
diff --git a/src/libponyc/codegen/genopt.cc b/src/libponyc/codegen/genopt.cc
index f72be1a552..b0f5a6b70b 100644
--- a/src/libponyc/codegen/genopt.cc
+++ b/src/libponyc/codegen/genopt.cc
@@ -1018,7 +1018,7 @@ static void optimise(compile_t* c, bool pony_specific)
   if (c->opt->release) {
     MPM = PB.buildPerModuleDefaultPipeline(OptimizationLevel::O3);
   } else {
-    MPM = PB.buildO0DefaultPipeline(OptimizationLevel::O0);
+    MPM = PB.buildPerModuleDefaultPipeline(OptimizationLevel::O1);
   }
 
   // Run the passes.
diff --git a/src/libponyc/codegen/genreference.c b/src/libponyc/codegen/genreference.c
index caeceb40ac..d8855ba761 100644
--- a/src/libponyc/codegen/genreference.c
+++ b/src/libponyc/codegen/genreference.c
@@ -234,6 +234,8 @@ LLVMValueRef gen_localdecl(compile_t* c, ast_t* ast)
   if(value != NULL)
     return GEN_NOVALUE;
 
+  //printf("%s\n", name);
+
   ast_t* type = deferred_reify(c->frame->reify, ast_type(id), c->opt);
   reach_type_t* t = reach_type(c->reach, type);
   ast_free_unattached(type);
@@ -254,6 +256,15 @@ LLVMValueRef gen_localdecl(compile_t* c, ast_t* ast)
   // Store the alloca to use when we reference this local.
   codegen_setlocal(c, name, alloc);
 
+  //if (strcmp(name, "t1") == 0 || strcmp(name, "t2") == 0) {
+  /*if (strcmp(name, "t1") == 0) {
+    ast_print(id, 80);
+    printf("%ld\n", ast_line(ast));
+    ast_print(ast, 80);
+    LLVMPositionBuilderAtEnd(c->builder, this_block);
+    return GEN_NOTNEEDED;
+  }*/
+
   LLVMMetadataRef file = codegen_difile(c);
   LLVMMetadataRef scope = codegen_discope(c);
 
diff --git a/test/libponyc-run/runner/_tester.pony b/test/libponyc-run/runner/_tester.pony
index 46c0212fa5..a0bb223a7c 100644
--- a/test/libponyc-run/runner/_tester.pony
+++ b/test/libponyc-run/runner/_tester.pony
@@ -303,6 +303,16 @@ actor _Tester
             i = i + 1
           end
           exit_code' = num.i32()?
+        else
+          // Some versions of lldb such as lldb 14 don't do "exited with status"
+          // but they do do "stop reason =". Unlike with "exited with status",
+          // we only get the stop reason if there was an error.
+          // We know this impacts lldb 14 and 15. 17 works like earlier lldb
+          // versions. We haven't tested with lldb 16.
+          try
+            let idx1 = _out_buf.find("stop reason =")?
+            exit_code' = -1
+          end
         end
       end