diff --git a/CMakeLists.txt b/CMakeLists.txt
index 367af2bbf92..56faf4ca2b1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -225,14 +225,14 @@ endif ()
 
 if (COMPILER_GCC OR COMPILER_CLANG)
     # to make numeric_limits<__int128> works with GCC
-    set (_CXX_STANDARD "-std=gnu++2a")
+    set (_CXX_STANDARD "gnu++2a")
 else()
-    set (_CXX_STANDARD "-std=c++2a")
+    set (_CXX_STANDARD "c++2a")
 endif()
 
 # cmake < 3.12 doesn't support 20. We'll set CMAKE_CXX_FLAGS for now
 # set (CMAKE_CXX_STANDARD 20)
-set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${_CXX_STANDARD}")
+set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=${_CXX_STANDARD}")
 
 set (CMAKE_CXX_EXTENSIONS 0) # https://cmake.org/cmake/help/latest/prop_tgt/CXX_EXTENSIONS.html#prop_tgt:CXX_EXTENSIONS
 set (CMAKE_CXX_STANDARD_REQUIRED ON)
diff --git a/cmake/limit_jobs.cmake b/cmake/limit_jobs.cmake
index 5b962f34c38..241fa509477 100644
--- a/cmake/limit_jobs.cmake
+++ b/cmake/limit_jobs.cmake
@@ -35,6 +35,15 @@ if (NOT PARALLEL_LINK_JOBS AND AVAILABLE_PHYSICAL_MEMORY AND MAX_LINKER_MEMORY)
     endif ()
 endif ()
 
+# ThinLTO provides its own parallel linking
+# But use 2 parallel jobs, since:
+# - this is what llvm does
+# - and I've verfied that lld-11 does not use all available CPU time (in peak) while linking one binary
+if (ENABLE_THINLTO AND PARALLEL_LINK_JOBS GREATER 2)
+    message(STATUS "ThinLTO provides its own parallel linking - limiting parallel link jobs to 2.")
+    set (PARALLEL_LINK_JOBS 2)
+endif()
+
 if (PARALLEL_LINK_JOBS AND (NOT NUMBER_OF_LOGICAL_CORES OR PARALLEL_COMPILE_JOBS LESS NUMBER_OF_LOGICAL_CORES))
     set(CMAKE_JOB_POOL_LINK link_job_pool${CMAKE_CURRENT_SOURCE_DIR})
     string (REGEX REPLACE "[^a-zA-Z0-9]+" "_" CMAKE_JOB_POOL_LINK ${CMAKE_JOB_POOL_LINK})
diff --git a/contrib/CMakeLists.txt b/contrib/CMakeLists.txt
index 48d760e7540..a7b1abb9f49 100644
--- a/contrib/CMakeLists.txt
+++ b/contrib/CMakeLists.txt
@@ -241,6 +241,14 @@ if (USE_EMBEDDED_COMPILER AND USE_INTERNAL_LLVM_LIBRARY)
     set (LLVM_ENABLE_RTTI 1 CACHE INTERNAL "")
     set (LLVM_ENABLE_PIC 0 CACHE INTERNAL "")
     set (LLVM_TARGETS_TO_BUILD "X86;AArch64" CACHE STRING "")
+    # Yes it is set globally, but this is not enough, since llvm will add -std=c++11 after default
+    # And c++2a cannot be used, due to ambiguous operator !=
+    if (COMPILER_GCC OR COMPILER_CLANG)
+        set (_CXX_STANDARD "gnu++17")
+    else()
+        set (_CXX_STANDARD "c++17")
+    endif()
+    set (LLVM_CXX_STD ${_CXX_STANDARD} CACHE STRING "" FORCE)
     add_subdirectory (llvm/llvm)
     target_include_directories(LLVMSupport SYSTEM BEFORE PRIVATE ${ZLIB_INCLUDE_DIR})
 endif ()
diff --git a/debian/control b/debian/control
index 12d69d9fff6..9b34e982698 100644
--- a/debian/control
+++ b/debian/control
@@ -5,8 +5,8 @@ Maintainer: Alexey Milovidov <milovidov@yandex-team.ru>
 Build-Depends: debhelper (>= 9),
                cmake | cmake3,
                ninja-build,
-               gcc-9 [amd64 i386] | gcc-8 [amd64 i386], g++-9 [amd64 i386] | g++-8 [amd64 i386],
-               clang-8 [arm64 armhf] | clang-7 [arm64 armhf] | clang-6.0 [arm64 armhf],
+               clang-11,
+               llvm-11,
                libc6-dev,
                libicu-dev,
                libreadline-dev,
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index ac735cb3bc3..6021065f937 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -6,6 +6,18 @@ if (USE_CLANG_TIDY)
     set (CMAKE_CXX_CLANG_TIDY "${CLANG_TIDY_PATH}")
 endif ()
 
+if(COMPILER_PIPE)
+    set(MAX_COMPILER_MEMORY 2500)
+else()
+    set(MAX_COMPILER_MEMORY 1500)
+endif()
+if(MAKE_STATIC_LIBRARIES)
+    set(MAX_LINKER_MEMORY 3500)
+else()
+    set(MAX_LINKER_MEMORY 2500)
+endif()
+include(../cmake/limit_jobs.cmake)
+
 set (CONFIG_VERSION ${CMAKE_CURRENT_BINARY_DIR}/Common/config_version.h)
 set (CONFIG_COMMON ${CMAKE_CURRENT_BINARY_DIR}/Common/config.h)
 
diff --git a/src/Parsers/New/CMakeLists.txt b/src/Parsers/New/CMakeLists.txt
index 1c3fd8368be..360dd4d7488 100644
--- a/src/Parsers/New/CMakeLists.txt
+++ b/src/Parsers/New/CMakeLists.txt
@@ -58,7 +58,7 @@ check_cxx_compiler_flag("-Wshadow" HAS_SHADOW)
 
 target_compile_options (clickhouse_parsers_new
     PRIVATE
-        -Wno-c++20-compat
+        -Wno-c++2a-compat
         -Wno-deprecated-this-capture
         -Wno-documentation-html
         -Wno-documentation
diff --git a/utils/CMakeLists.txt b/utils/CMakeLists.txt
index 322ad2630d1..a27a7e9dadc 100644
--- a/utils/CMakeLists.txt
+++ b/utils/CMakeLists.txt
@@ -2,6 +2,13 @@ if (USE_CLANG_TIDY)
     set (CMAKE_CXX_CLANG_TIDY "${CLANG_TIDY_PATH}")
 endif ()
 
+if(MAKE_STATIC_LIBRARIES)
+    set(MAX_LINKER_MEMORY 3500)
+else()
+    set(MAX_LINKER_MEMORY 2500)
+endif()
+include(../cmake/limit_jobs.cmake)
+
 # Utils used in package
 add_subdirectory (config-processor)
 add_subdirectory (report)