From 73daf206496b0df21ba2db4284002e596ea9691b Mon Sep 17 00:00:00 2001
From: Kris Kwiatkowski <contact@amongbytes.com>
Date: Tue, 22 Jun 2021 01:10:53 +0100
Subject: [PATCH] Memory Sanitizer build

---
 .cmake/libstd-memory_sanitizer.mk |  6 ++++--
 .github/workflows/main.yml        | 32 +++++++++++++++----------------
 CMakeLists.txt                    | 10 ++++++++--
 test/bench/CMakeLists.txt         | 11 +++++++++--
 4 files changed, 37 insertions(+), 22 deletions(-)

diff --git a/.cmake/libstd-memory_sanitizer.mk b/.cmake/libstd-memory_sanitizer.mk
index a6fc3b8c..f610c3e9 100644
--- a/.cmake/libstd-memory_sanitizer.mk
+++ b/.cmake/libstd-memory_sanitizer.mk
@@ -13,7 +13,7 @@ ExternalProject_Add(
   GIT_REPOSITORY    https://github.com/llvm/llvm-project.git
   GIT_TAG           llvmorg-12.0.0
   GIT_SHALLOW       TRUE
-  CMAKE_ARGS        -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS=${LLVM_PROJECT_TARGETS} -DLLVM_USE_SANITIZER=MemoryWithOrigins -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ ../llvm-project/llvm
+  CMAKE_ARGS        -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS=${LLVM_PROJECT_TARGETS} -DLLVM_USE_SANITIZER=MemoryWithOrigins -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ ../llvm-project/llvm -DLLVM_INCLUDE_BENCHMARKS=OFF
   BUILD_COMMAND     ${MAKE_PROGRAM} cxx cxxabi
   INSTALL_COMMAND   DESTDIR=${PREFIX} make install-cxx-headers install-cxx install-cxxabi
   COMMENT           "Building memcheck instrumented libc++ and libc++abi"
@@ -37,4 +37,6 @@ set_target_properties(
 set_target_properties(
     cxxabi PROPERTIES IMPORTED_LOCATION ${LLVM_LIB_CXXABI})
 
-set_property(GLOBAL PROPERTY llvmproject_build_install_dir_property ${PREFIX}/usr/local)
+set_property(
+  GLOBAL PROPERTY llvmproject_build_install_dir_property
+  ${PREFIX}/usr/local)
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 415fafff..e5f93df8 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -86,19 +86,19 @@ jobs:
           curl http://amongbytes.com/~flowher/permalinks/kat.zip --output kat.zip
           unzip kat.zip
           cargo run --release -- --katdir KAT
-#  MEMSAN:
-#    name: Memory Sanitizer build
-#    runs-on: [ubuntu-20.04]
-#    steps:
-#      - uses: actions/checkout@v1
-#        with:
-#          submodules: true
-#      - name: build
-#        run: |
-#          mkdir -p build
-#          cd build
-#          CC=clang CXX=clang++ cmake -DCMAKE_BUILD_TYPE=Release -DMEMSAN=1 ..
-#          make
-#      - name: run tests
-#        run: |
-#          cd build && ./ut --gtest_filter="NONE"
+  MEMSAN:
+    name: Memory Sanitizer build
+    runs-on: [ubuntu-20.04]
+    steps:
+      - uses: actions/checkout@v1
+        with:
+          submodules: true
+      - name: build
+        run: |
+          mkdir -p build
+          cd build
+          CC=clang CXX=clang++ cmake -DCMAKE_BUILD_TYPE=Release -DMEMSAN=1 ..
+          make
+      - name: run tests
+        run: |
+          cd build && ./ut --gtest_filter="NONE"
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0a27cc46..9e60c4ff 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -53,7 +53,6 @@ FetchContent_Declare(
   SOURCE_DIR     ${PROJECT_SOURCE_DIR}/3rd/gbench
   GIT_REPOSITORY https://github.com/kriskwiatkowski/benchmark.git
   GIT_TAG        49862ab56b6b7c3afd87b80bd5d787ed78ce3b96
-  GIT_SHALLOW    TRUE
 )
 FetchContent_Populate(gbench)
 
@@ -62,7 +61,6 @@ FetchContent_Declare(
   SOURCE_DIR     ${PROJECT_SOURCE_DIR}/3rd/cpu_features
   GIT_REPOSITORY https://github.com/google/cpu_features.git
   GIT_TAG        bc2846e78faeb26b8a46c17df369d4e5f1f9e2bb
-  GIT_SHALLOW    TRUE
 )
 FetchContent_Populate(cpu_features)
 
@@ -382,8 +380,16 @@ if(NOT CMAKE_BUILD_TYPE_LOWER STREQUAL "debug")
   # set(BENCHMARK_ENABLE_LTO ON CACHE BOOL "Enable link time optim" FORCE)
   #endif()
   set(BENCHMARK_ENABLE_INSTALL OFF CACHE BOOL "" FORCE)
+  set(BENCHMARK_ENABLE_EXCEPTIONS OFF CACHE BOOL "" FORCE)
   set(CMAKE_C_FLAGS "${C_CXX_FLAGS} ${EXTRA_CXX_FLAGS}")
   set(CMAKE_CXX_FLAGS "${C_CXX_FLAGS} ${EXTRA_CXX_FLAGS}")
+  if (MEMSAN)
+    set(BENCHMARK_USE_LIBCXX ON CACHE BOOL "" FORCE)
+    # Since build requires C++20 it is safe to assume that std::regex is available.
+    # It seems I need to force it as benchmark build doesn't work very well with libc++
+    set(HAVE_STD_REGEX ON CACHE BOOL "OK" FORCE)
+  endif()
+
   add_subdirectory(${CMAKE_SOURCE_DIR}/3rd/gbench)
   add_subdirectory(test/bench)
 endif()
diff --git a/test/bench/CMakeLists.txt b/test/bench/CMakeLists.txt
index ad005ee1..3f5135d1 100644
--- a/test/bench/CMakeLists.txt
+++ b/test/bench/CMakeLists.txt
@@ -1,12 +1,16 @@
 cmake_minimum_required(VERSION 3.13)
+set(CMAKE_CXX_STANDARD 14)
 
 include_directories(${PROJECT_SOURCE_DIR}/3rd/gbench/include)
 link_directories(${CMAKE_CURRENT_BINARY_DIR}/../../3rd/gbench/lib)
 
+if (MEMSAN)
+set(CXXLIBS_FOR_MEMORY_SANITIZER cxx cxxabi)
+endif()
+
 add_executable(
     bench
-    kyber.cc
-)
+    kyber.cc)
 
 target_link_libraries(
     bench
@@ -16,3 +20,6 @@ target_link_libraries(
     benchmark_main
     ${CXXLIBS_FOR_MEMORY_SANITIZER})
 
+if (MEMSAN)
+add_dependencies(bench ${CXXLIBS_FOR_MEMORY_SANITIZER})
+endif()