diff --git a/cmake/init-compilation-flags.cmake b/cmake/init-compilation-flags.cmake
index 09ae3e17cd..a2aee3f278 100644
--- a/cmake/init-compilation-flags.cmake
+++ b/cmake/init-compilation-flags.cmake
@@ -36,7 +36,7 @@ if(APPLE)
     add_definitions(-D_XOPEN_SOURCE)
 else()
     # Since Ubuntu 22.04 lto is enabled by default; breaks some builds
-    add_link_options(-fno-lto)
+    #add_link_options(-fno-lto)
 endif()
 
 
@@ -65,6 +65,20 @@ endif()
 cmake_print_variables(CMAKE_BUILD_TYPE)
 if("${CMAKE_BUILD_TYPE}" STREQUAL ${DEFAULT_BUILD_TYPE})
     add_compile_options(-O3)
+    set(CMAKE_INTERPROCEDURAL_OPTIMIZATION 1)
+    if(CMAKE_INTERPROCEDURAL_OPTIMIZATION)
+        set(COMPILE_LTO_OPTIONS -flto)
+        set(LINK_LTO_OPTIONS -flto)
+        if(NOT APPLE)
+            list(APPEND COMPILE_LTO_OPTIONS -ffat-lto-objects)
+        endif()
+        if(COMPILER_GCC)
+            list(APPEND COMPILE_LTO_OPTIONS -Wl,-flto)
+        endif()
+        add_compile_options(${COMPILE_LTO_OPTIONS})
+        add_link_options(${LINK_LTO_OPTIONS})
+        list(JOIN COMPILE_LTO_OPTIONS " " THIRD_PARTY_LTO_OPTIONS)
+    endif()
 endif()
 
 if(DEFINED ENV{FAST_COMPILATION_FMT})
diff --git a/cmake/utils.cmake b/cmake/utils.cmake
index 2747a77f98..be6b879487 100644
--- a/cmake/utils.cmake
+++ b/cmake/utils.cmake
@@ -69,7 +69,13 @@ endfunction()
 
 function(allow_deprecated_declarations)
     foreach(src_file ${ARGN})
-        set_source_files_properties(${src_file} PROPERTIES COMPILE_FLAGS -Wno-deprecated-declarations)
+        set_property(SOURCE ${src_file} APPEND PROPERTY COMPILE_OPTIONS -Wno-deprecated-declarations)
+    endforeach()
+endfunction()
+
+function(allow_stringop_overflow)
+    foreach(src_file ${ARGN})
+        set_property(SOURCE ${src_file} APPEND PROPERTY COMPILE_OPTIONS -Wno-stringop-overflow)
     endforeach()
 endfunction()
 
diff --git a/compiler/compiler-settings.cpp b/compiler/compiler-settings.cpp
index 491e23f4aa..1575da4004 100644
--- a/compiler/compiler-settings.cpp
+++ b/compiler/compiler-settings.cpp
@@ -340,7 +340,7 @@ void CompilerSettings::init() {
   std::string cxx_default_flags = ss.str();
 
   cxx_toolchain_option.value_ = !cxx_toolchain_dir.value_.empty() ? ("-B" + cxx_toolchain_dir.value_) : "";
-  incremental_linker_flags.value_ = dynamic_incremental_linkage.get() ? "-shared" : "-r -nostdlib";
+  incremental_linker_flags.value_ = dynamic_incremental_linkage.get() ? "-shared" : "-r -nostdlib -gdwarf64 -gdwarf-5 -mcmodel=large -flto -Wl,-flto -flinker-output=rel";
 
   remove_extra_spaces(extra_ld_flags.value_);
 
diff --git a/compiler/compiler.cmake b/compiler/compiler.cmake
index 3fcdcab68e..4d697b978a 100644
--- a/compiler/compiler.cmake
+++ b/compiler/compiler.cmake
@@ -225,9 +225,36 @@ prepend(KPHP_COMPILER_SOURCES ${KPHP_COMPILER_DIR}/
         utils/string-utils.cpp)
 
 # Suppress YAML-cpp-related warnings
-if(COMPILER_CLANG)
-    allow_deprecated_declarations(${KPHP_COMPILER_DIR}/data/composer-json-data.cpp)
-    allow_deprecated_declarations(${KPHP_COMPILER_DIR}/data/modulite-data.cpp)
+if(COMPILER_CLANG OR (COMPILER_GCC AND (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "12.0.0")))
+    allow_deprecated_declarations(
+            ${KPHP_COMPILER_DIR}/data/composer-json-data.cpp
+            ${KPHP_COMPILER_DIR}/data/modulite-data.cpp
+    )
+endif()
+
+if(COMPILER_GCC AND (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "12.0.0"))
+    allow_stringop_overflow(
+            ${KPHP_COMPILER_DIR}/code-gen/vertex-compiler.cpp
+            ${KPHP_COMPILER_DIR}/data/class-data.cpp
+            ${KPHP_COMPILER_DIR}/data/kphp-json-tags.cpp
+            ${KPHP_COMPILER_DIR}/data/generics-mixins.cpp
+            ${KPHP_COMPILER_DIR}/data/kphp-tracing-tags.cpp
+            ${KPHP_COMPILER_DIR}/data/modulite-data.cpp
+            ${KPHP_COMPILER_DIR}/code-gen/files/tracing-autogen.cpp
+            ${KPHP_COMPILER_DIR}/pipes/analyze-performance.cpp
+            ${KPHP_COMPILER_DIR}/pipes/check-access-modifiers.cpp
+            ${KPHP_COMPILER_DIR}/pipes/check-classes.cpp
+            ${KPHP_COMPILER_DIR}/pipes/check-tl-classes.cpp
+            ${KPHP_COMPILER_DIR}/pipes/code-gen.cpp
+            ${KPHP_COMPILER_DIR}/pipes/filter-only-actually-used.cpp
+            ${KPHP_COMPILER_DIR}/pipes/final-check.cpp
+            ${KPHP_COMPILER_DIR}/pipes/parse-and-apply-phpdoc.cpp
+            ${KPHP_COMPILER_DIR}/pipes/sort-and-inherit-classes.cpp
+            ${KPHP_COMPILER_DIR}/pipes/register-kphp-configuration.cpp
+            ${KPHP_COMPILER_DIR}/phpdoc.cpp
+            ${KPHP_COMPILER_DIR}/gentree.cpp
+            ${KPHP_COMPILER_DIR}/make/make.cpp
+    )
 endif()
 
 if(APPLE)
diff --git a/compiler/ffi/c_parser/parsing_driver.cpp b/compiler/ffi/c_parser/parsing_driver.cpp
index e0989a6aca..709a3feba1 100644
--- a/compiler/ffi/c_parser/parsing_driver.cpp
+++ b/compiler/ffi/c_parser/parsing_driver.cpp
@@ -11,6 +11,7 @@
 
 #include <charconv>
 #include <unordered_set>
+#include <vector>
 
 using namespace ffi;
 
@@ -113,7 +114,7 @@ FFIType *ParsingDriver::function_to_var(FFIType *function) {
   function->kind = FFITypeKind::Var;
   FFIType *function_ptr_type = alloc.new_type(FFITypeKind::FunctionPointer);
   function_ptr_type->members = std::move(function->members);
-  function->members = {function_ptr_type};
+  function->members = std::vector<FFIType*>{function_ptr_type};
   return function;
 }
 
diff --git a/runtime-common/core/core-types/definition/array.inl b/runtime-common/core/core-types/definition/array.inl
index ce1270adae..b6f3d8ef7a 100644
--- a/runtime-common/core/core-types/definition/array.inl
+++ b/runtime-common/core/core-types/definition/array.inl
@@ -107,14 +107,22 @@ template<>
 inline typename array<Unknown>::array_inner* array<Unknown>::array_inner::empty_array() {
   // need this hack because gcc10 and newer complains about
   // "array subscript is outside array bounds of array<Unknown>::array_inner"
-  static array_inner_control empty_array[1]{{
-      true,
-      ExtraRefCnt::for_global_const,
-      -1,
-      {0, 0},
-      0,
-      2,
-  }};
+  static array_inner_control empty_array[2]{{
+                                                true,
+                                                ExtraRefCnt::for_global_const,
+                                                -1,
+                                                {0, 0},
+                                                0,
+                                                2,
+                                            },
+                                            {
+                                                true,
+                                                ExtraRefCnt::for_global_const,
+                                                -1,
+                                                {0, 0},
+                                                0,
+                                                2,
+                                            }};
   return static_cast<array<Unknown>::array_inner*>(&empty_array[0]);
 }
 
diff --git a/runtime/runtime.cmake b/runtime/runtime.cmake
index 80d5a0b1e0..9aa98ff158 100644
--- a/runtime/runtime.cmake
+++ b/runtime/runtime.cmake
@@ -142,7 +142,7 @@ set_source_files_properties(
 )
 
 # Suppress YAML-cpp-related warnings
-if(COMPILER_CLANG)
+if(COMPILER_CLANG OR (COMPILER_GCC AND (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "12.0.0")))
     allow_deprecated_declarations(${BASE_DIR}/runtime/interface.cpp)
 endif()
 
diff --git a/server/server.cmake b/server/server.cmake
index 59ac5f311c..fd1b5dbf9f 100644
--- a/server/server.cmake
+++ b/server/server.cmake
@@ -31,12 +31,14 @@ prepend(KPHP_SERVER_SOURCES ${BASE_DIR}/server/
         signal-handlers.cpp)
 
 # Suppress YAML-cpp-related warnings
-if(COMPILER_CLANG)
-    allow_deprecated_declarations(${BASE_DIR}/server/json-logger.cpp)
-    allow_deprecated_declarations(${BASE_DIR}/server/lease-config-parser.cpp)
-    allow_deprecated_declarations(${BASE_DIR}/server/php-engine.cpp)
-    allow_deprecated_declarations(${BASE_DIR}/server/php-master.cpp)
-    allow_deprecated_declarations(${BASE_DIR}/server/server-config.cpp)
+if(COMPILER_CLANG OR (COMPILER_GCC AND (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "12.0.0")))
+    allow_deprecated_declarations(
+            ${BASE_DIR}/server/json-logger.cpp
+            ${BASE_DIR}/server/lease-config-parser.cpp
+            ${BASE_DIR}/server/php-engine.cpp
+            ${BASE_DIR}/server/php-master.cpp
+            ${BASE_DIR}/server/server-config.cpp
+    )
 endif()
 
 prepend(KPHP_JOB_WORKERS_SOURCES ${BASE_DIR}/server/job-workers/
diff --git a/tests/cpp/server/server-tests.cmake b/tests/cpp/server/server-tests.cmake
index 98827729e2..ebfd72f529 100644
--- a/tests/cpp/server/server-tests.cmake
+++ b/tests/cpp/server/server-tests.cmake
@@ -7,7 +7,7 @@ prepend(SERVER_TESTS_SOURCES ${BASE_DIR}/tests/cpp/server/
         workers-control-test.cpp)
 
 # Suppress YAML-cpp-related warnings
-if(COMPILER_CLANG)
+if(COMPILER_CLANG OR (COMPILER_GCC AND (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "12.0.0")))
     allow_deprecated_declarations(${BASE_DIR}/tests/cpp/server/server-config-test.cpp)
 endif()
 
diff --git a/third-party/curl-cmake/curl.cmake b/third-party/curl-cmake/curl.cmake
index 0b0178a043..19d7d63413 100644
--- a/third-party/curl-cmake/curl.cmake
+++ b/third-party/curl-cmake/curl.cmake
@@ -25,7 +25,7 @@ function(build_curl PIC_ENABLED)
     file(MAKE_DIRECTORY ${install_dir})
     file(MAKE_DIRECTORY ${include_dirs})
 
-    set(compile_flags "$ENV{CFLAGS} -g0 -Wno-deprecated-declarations ${extra_compile_flags}")
+    set(compile_flags "$ENV{CFLAGS} ${THIRD_PARTY_LTO_OPTIONS} -g0 -Wno-deprecated-declarations ${extra_compile_flags}")
 
     # Suppress compiler-specific warnings caused by -O3
     if(COMPILER_CLANG)
diff --git a/third-party/nghttp2-cmake/nghttp2.cmake b/third-party/nghttp2-cmake/nghttp2.cmake
index 87458c35a5..835d4809c8 100644
--- a/third-party/nghttp2-cmake/nghttp2.cmake
+++ b/third-party/nghttp2-cmake/nghttp2.cmake
@@ -30,7 +30,7 @@ function(build_nghttp2 PIC_ENABLED)
     file(MAKE_DIRECTORY ${install_dir})
     file(MAKE_DIRECTORY ${include_dirs})
 
-    set(compile_flags "$ENV{CFLAGS} -g0 ${extra_compile_flags}")
+    set(compile_flags "$ENV{CFLAGS} ${THIRD_PARTY_LTO_OPTIONS} -g0 ${extra_compile_flags}")
 
     message(STATUS "NGHTTP2 Summary:
 
diff --git a/third-party/numactl-cmake/numactl.cmake b/third-party/numactl-cmake/numactl.cmake
index 4682907dc7..ed5f32a051 100644
--- a/third-party/numactl-cmake/numactl.cmake
+++ b/third-party/numactl-cmake/numactl.cmake
@@ -27,7 +27,7 @@ function(build_numactl PIC_ENABLED)
 
     # The configuration has been based on:
     # https://sources.debian.org/src/numactl/2.0.12-1/debian/rules/
-    set(compile_flags "$ENV{CFLAGS} -Wno-unused-but-set-variable -g0 ${extra_compile_flags}")
+    set(compile_flags "$ENV{CFLAGS} -Wno-unused-but-set-variable -g0 -fno-lto ${extra_compile_flags}")
 
     message(STATUS "NUMA Summary:
 
diff --git a/third-party/openssl-cmake/openssl.cmake b/third-party/openssl-cmake/openssl.cmake
index 0fec65a816..3b356a1e59 100644
--- a/third-party/openssl-cmake/openssl.cmake
+++ b/third-party/openssl-cmake/openssl.cmake
@@ -35,7 +35,7 @@ function(build_openssl PIC_ENABLED)
     file(MAKE_DIRECTORY ${install_dir})
     file(MAKE_DIRECTORY ${include_dirs})
 
-    set(compile_flags "$ENV{CFLAGS} -g0 ${extra_compile_flags}")
+    set(compile_flags "$ENV{CFLAGS} ${THIRD_PARTY_LTO_OPTIONS} -g0 ${extra_compile_flags}")
 
     # The configuration has been based on:
     # https://packages.debian.org/buster/libssl1.1
diff --git a/third-party/pcre-cmake/pcre.cmake b/third-party/pcre-cmake/pcre.cmake
index 38325357dd..0b345038e9 100644
--- a/third-party/pcre-cmake/pcre.cmake
+++ b/third-party/pcre-cmake/pcre.cmake
@@ -30,7 +30,7 @@ function(build_pcre PIC_ENABLED)
     file(MAKE_DIRECTORY ${install_dir})
     file(MAKE_DIRECTORY ${include_dirs})
 
-    set(compile_flags "$ENV{CFLAGS} -g0 -Wall ${extra_compile_flags}")
+    set(compile_flags "$ENV{CFLAGS} ${THIRD_PARTY_LTO_OPTIONS} -g0 -Wall ${extra_compile_flags}")
 
     message(STATUS "PCRE Summary:
 
diff --git a/third-party/pcre2-cmake/pcre2.cmake b/third-party/pcre2-cmake/pcre2.cmake
index d72510dc98..4cd9c5b364 100644
--- a/third-party/pcre2-cmake/pcre2.cmake
+++ b/third-party/pcre2-cmake/pcre2.cmake
@@ -28,7 +28,7 @@ function(build_pcre2 PIC_ENABLED)
     file(MAKE_DIRECTORY ${install_dir})
     file(MAKE_DIRECTORY ${include_dirs})
 
-    set(compile_flags "$ENV{CFLAGS} -O3 ${extra_compile_flags}")
+    set(compile_flags "$ENV{CFLAGS} ${THIRD_PARTY_LTO_OPTIONS} -O3 ${extra_compile_flags}")
 
     message(STATUS "PCRE2 Summary:
 
diff --git a/third-party/re2-cmake/re2.cmake b/third-party/re2-cmake/re2.cmake
index 446c77fe25..3341f31a06 100644
--- a/third-party/re2-cmake/re2.cmake
+++ b/third-party/re2-cmake/re2.cmake
@@ -37,7 +37,7 @@ function(build_re2 PIC_ENABLED)
 
     # The configuration has been based on:
     # https://sources.debian.org/src/re2/20190101%2Bdfsg-2/debian/rules/#L5
-    set(compile_flags "$ENV{CFLAGS} -g0 -Wall -std=c++11 -O3 ${extra_compile_flags}")
+    set(compile_flags "$ENV{CFLAGS} ${THIRD_PARTY_LTO_OPTIONS} -g0 -Wall -std=c++11 -O3 ${extra_compile_flags}")
 
     message(STATUS "RE2 Summary:
 
diff --git a/third-party/timelib-cmake/timelib.cmake b/third-party/timelib-cmake/timelib.cmake
index a99225c9bd..3c1c07ac78 100644
--- a/third-party/timelib-cmake/timelib.cmake
+++ b/third-party/timelib-cmake/timelib.cmake
@@ -36,7 +36,7 @@ function(build_timelib PIC_ENABLED)
     file(MAKE_DIRECTORY ${install_dir})
     file(MAKE_DIRECTORY ${include_dirs})
 
-    set(compile_flags "$ENV{CFLAGS} -g0 ${extra_compile_flags}")
+    set(compile_flags "$ENV{CFLAGS} ${THIRD_PARTY_LTO_OPTIONS} -g0 ${extra_compile_flags}")
 
     message(STATUS "Timelib Summary:
 
diff --git a/third-party/uber-h3-cmake/uber-h3.cmake b/third-party/uber-h3-cmake/uber-h3.cmake
index f692505ce4..0fad35c907 100644
--- a/third-party/uber-h3-cmake/uber-h3.cmake
+++ b/third-party/uber-h3-cmake/uber-h3.cmake
@@ -26,7 +26,7 @@ function(build_uber_h3 PIC_ENABLED)
     file(MAKE_DIRECTORY ${install_dir})
     file(MAKE_DIRECTORY ${include_dirs})
 
-    set(compile_flags "$ENV{CFLAGS} -g0 ${extra_compile_flags}")
+    set(compile_flags "$ENV{CFLAGS} ${THIRD_PARTY_LTO_OPTIONS} -g0 ${extra_compile_flags}")
 
     message(STATUS "Uber-h3 Summary:
 
diff --git a/third-party/yaml-cpp-cmake/yaml-cpp.cmake b/third-party/yaml-cpp-cmake/yaml-cpp.cmake
index 9d8e57766d..52da416708 100644
--- a/third-party/yaml-cpp-cmake/yaml-cpp.cmake
+++ b/third-party/yaml-cpp-cmake/yaml-cpp.cmake
@@ -25,7 +25,7 @@ function(build_yaml_cpp PIC_ENABLED)
     file(MAKE_DIRECTORY ${install_dir})
     file(MAKE_DIRECTORY ${include_dirs})
 
-    set(compile_flags "$ENV{CFLAGS} -g0 ${extra_compile_flags}")
+    set(compile_flags "$ENV{CFLAGS} ${THIRD_PARTY_LTO_OPTIONS} -g0 ${extra_compile_flags}")
 
     # Suppress compiler-specific warnings
     if(COMPILER_CLANG)
diff --git a/third-party/zlib-cmake/zlib.cmake b/third-party/zlib-cmake/zlib.cmake
index 13cf3c356d..7bbb8e7b95 100644
--- a/third-party/zlib-cmake/zlib.cmake
+++ b/third-party/zlib-cmake/zlib.cmake
@@ -27,7 +27,7 @@ function(build_zlib PIC_ENABLED)
 
     # The configuration has been based on:
     # https://sources.debian.org/src/zlib/1%3A1.3.dfsg%2Breally1.3.1-1/debian/rules/#L20
-    set(compile_flags "$ENV{CFLAGS} -g0 -Wall -O3 -D_REENTRANT ${extra_compile_flags}")
+    set(compile_flags "$ENV{CFLAGS} ${THIRD_PARTY_LTO_OPTIONS} -g0 -Wall -O3 -D_REENTRANT ${extra_compile_flags}")
 
     message(STATUS "Zlib Summary:
 
diff --git a/third-party/zstd-cmake/zstd.cmake b/third-party/zstd-cmake/zstd.cmake
index 2448568b3e..053dc89958 100644
--- a/third-party/zstd-cmake/zstd.cmake
+++ b/third-party/zstd-cmake/zstd.cmake
@@ -30,7 +30,7 @@ function(build_zstd PIC_ENABLED)
 
     # The configuration has been based on:
     # https://sources.debian.org/src/libzstd/1.4.8%2Bdfsg-2.1/debian/rules/
-    set(compile_flags "$ENV{CFLAGS} -g0 -Wno-unused-but-set-variable ${extra_compile_flags}")
+    set(compile_flags "$ENV{CFLAGS} ${THIRD_PARTY_LTO_OPTIONS} -g0 -Wno-unused-but-set-variable ${extra_compile_flags}")
 
     message(STATUS "ZSTD Summary:
 
diff --git a/vkext/vkext-rpc.cpp b/vkext/vkext-rpc.cpp
index 6f5512327c..1096c52d15 100644
--- a/vkext/vkext-rpc.cpp
+++ b/vkext/vkext-rpc.cpp
@@ -155,7 +155,9 @@ void update_precise_now() {
 }
 
 rpc_connection *rpc_connection_get(int fd) {
-  rpc_connection **T = tree_lookup_value_connection(rpc_connection_tree, reinterpret_cast<rpc_connection *>(&fd));
+  static rpc_connection dummy_rpc_connection{};
+  dummy_rpc_connection.fd = fd;
+  rpc_connection **T = tree_lookup_value_connection(rpc_connection_tree, reinterpret_cast<rpc_connection *>(&dummy_rpc_connection));
   return T ? *T : 0;
 }