From 639d340f46ba30e8110e3f8be36129e7ceb38c1b Mon Sep 17 00:00:00 2001
From: Sameer Rahmani <lxsameer@gnu.org>
Date: Wed, 8 Mar 2023 20:54:30 +0000
Subject: [PATCH] builder: Setup the cache file for serene binary

---
 CMakeLists.txt                |  1 +
 cmake/caches/serene_dev.cmake |  2 ++
 serene/CMakeLists.txt         | 47 +++++++++++++++++++++++++----------
 serene/src/serene.cpp         | 34 ++++++++++++++++++++++++-
 4 files changed, 70 insertions(+), 14 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0479d8e..131c678 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -99,6 +99,7 @@ if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
     -Wdouble-promotion
     -Wformat=2)
 
+  add_link_options(-fuse-ld=lld)
   # if ((SERENE_USE_LIBCXX) AND (NOT (SERENE_TOOLCHAIN_PATH)))
   #   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++ -v")
   #   set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -stdlib=libc++ -lc++abi")
diff --git a/cmake/caches/serene_dev.cmake b/cmake/caches/serene_dev.cmake
index 11c5231..069ea0f 100644
--- a/cmake/caches/serene_dev.cmake
+++ b/cmake/caches/serene_dev.cmake
@@ -45,6 +45,8 @@ set(CMAKE_CXX_COMPILER "${SERENE_LLVM_BIN}/clang++" CACHE PATH "")
 # a mistake
 set(BDWgc_DIR "${SERENE_PKG_DIR}/bdwgc.${BDWGC_VERSION}")
 
+set(MUSL_DIR "${SERENE_PKG_DIR}/musl.${MUSL_VERSION}/" CACHE PATH "")
+
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON CACHE BOOL "")
 set(SERENE_CCACHE_DIR "$ENV{HOME}/.ccache" CACHE STRING "")
 set(CMAKE_BUILD_TYPE "Debug")
diff --git a/serene/CMakeLists.txt b/serene/CMakeLists.txt
index 6140ee5..8b1b3f4 100644
--- a/serene/CMakeLists.txt
+++ b/serene/CMakeLists.txt
@@ -49,8 +49,7 @@ set_target_properties(serene PROPERTIES
   SOVERSION ${PROJECT_VERSION_MAJOR}
   # Warn on unused libs
   LINK_WHAT_YOU_USE TRUE
-  # LTO support
-  INTERPROCEDURAL_OPTIMIZATION TRUE)
+)
 
 if (CPP_20_SUPPORT)
   target_compile_features(serene PRIVATE cxx_std_20)
@@ -64,9 +63,21 @@ target_include_directories(serene
   ${CMAKE_CURRENT_SOURCE_DIR}/include
 )
 
+
 # We don't want the generated files from table gen
 # to be treated as local since the contain warnings
-target_include_directories(serene SYSTEM PRIVATE ${PROJECT_BINARY_DIR}/include)
+target_include_directories(serene SYSTEM PRIVATE
+  ${PROJECT_BINARY_DIR}/include
+  # ${SERENE_LLVM_DIR}/include/x86_64-unknown-linux-gnu/c++/v1
+  # ${SERENE_LLVM_DIR}/include/c++/v1
+  #${MUSL_DIR}/include
+)
+
+target_link_directories(serene
+  PRIVATE
+  # ${SERENE_LLVM_DIR}/lib
+  # ${MUSL_DIR}/lib
+)
 
 # Autogenerate the `config.h` file
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/include/serene/config.h.in include/serene/config.h)
@@ -74,9 +85,17 @@ configure_file(${CMAKE_CURRENT_SOURCE_DIR}/include/serene/config.h.in include/se
 
 target_compile_options(serene
   PRIVATE
+  -stdlib=libc++
   # LLVM has it's own RTTI
   -fno-rtti
   -fno-builtin-strlen
+  # Don't link against system's default libc++ or libstdc++
+  # -nostdinc++
+  # -nostdlib++
+
+  # Do not link any default library, We want to be explicit
+  # -nodefaultlibs
+  # -nostdinc
 
   # Dedicate a section to each function, so the linker
   # can do a better job on dead code elimination
@@ -106,14 +125,13 @@ target_compile_options(serene
 
 target_link_options(serene
   PRIVATE
-  -fuse-ld=lld
-  -Wl,-gc-sections
-
+  -stdlib=libc++
+  -lc++abi
+  -Wl,--gc-sections
   $<$<CONFIG:RELEASE>:-s>
 
   $<$<CONFIG:DEBUG>:-fsanitize=address>
   $<$<CONFIG:DEBUG>:-static-libsan>
-
   # Do not link against shared libraries
   --static
 )
@@ -126,15 +144,18 @@ if(SERENE_ENABLE_TIDY)
   set_target_properties(serene PROPERTIES CXX_CLANG_TIDY ${CLANG_TIDY_PATH})
 endif()
 
-
-
-# TODO: Setup the THINLTO on release
 if(SERENE_ENABLE_THINLTO)
+  include(CheckIPOSupported)
+  # Optional IPO. Do not use IPO if it's not supported by compiler.
+  check_ipo_supported(RESULT result OUTPUT output)
+  if(result)
+    set_property(TARGET serene PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE)
+  else()
+    message(WARNING "IPO is not supported: ${output}")
+    message(WARNING "Make sure to use lld")
+  endif()
 endif()
 
-# target_link_libraries(serene
-#   PRIVATE
-#   )
 
 include(GNUInstallDirs)
 
diff --git a/serene/src/serene.cpp b/serene/src/serene.cpp
index 4c63786..1878c78 100644
--- a/serene/src/serene.cpp
+++ b/serene/src/serene.cpp
@@ -16,4 +16,36 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-int main() { return 0; }
+
+#include <iomanip>
+#include <memory>
+#include <iostream>
+
+struct Vec3
+{
+    int x, y, z;
+
+    // following constructor is no longer needed since C++20
+    Vec3(int x = 0, int y = 0, int z = 0) noexcept : x(x), y(y), z(z) { }
+
+    friend std::ostream& operator<<(std::ostream& os, const Vec3& v)
+    {
+        return os << "{ x=" << v.x << ", y=" << v.y << ", z=" << v.z << " }";
+    }
+};
+
+int main()
+{
+    // Use the default constructor.
+    std::unique_ptr<Vec3> v1 = std::make_unique<Vec3>();
+    // Use the constructor that matches these arguments
+    std::unique_ptr<Vec3> v2 = std::make_unique<Vec3>(0,1,2);
+    // Create a unique_ptr to an array of 5 elements
+    std::unique_ptr<Vec3[]> v3 = std::make_unique<Vec3[]>(5);
+
+    std::cout << "make_unique<Vec3>():      " << *v1 << '\n'
+              << "make_unique<Vec3>(0,1,2): " << *v2 << '\n'
+              << "make_unique<Vec3[]>(5):   ";
+    for (int i = 0; i < 5; i++)
+      std::cout << std::setw(i ? 30 : 0) << v3[static_cast<size_t>(i)] << '\n';
+}