Added an option to compile without LTO

CMakeLists.txt

@@ -4,6 +4,7 @@ project(p2pool)
 option(STATIC_BINARY "Build static binary" OFF)
 option(STATIC_LIBS "Link libuv and libzmq statically" OFF)
 option(WITH_RANDOMX "Include the RandomX library in the build. If this is turned off, p2pool will rely on monerod for verifying RandomX hashes" ON)
+option(WITH_LTO "Use link-time compiler optimization (if linking fails for you, run cmake with -DWITH_LTO=OFF)" ON)
 
 option(DEV_TEST_SYNC "[Developer only] Sync test, stop p2pool after sync is complete" OFF)
 

cmake/flags.cmake

@@ -8,7 +8,11 @@ set(CMAKE_C_STANDARD_REQUIRED ON)
 if (CMAKE_CXX_COMPILER_ID MATCHES GNU)
 	set(GENERAL_FLAGS "-pthread")
 	set(WARNING_FLAGS "-Wall -Wextra -Wcast-align -Wcast-qual -Wlogical-op -Wstrict-overflow=2 -Wundef -Wformat=2 -Wpointer-arith -Werror")
-	set(OPTIMIZATION_FLAGS "-Ofast -s -flto -fuse-linker-plugin")
+	set(OPTIMIZATION_FLAGS "-Ofast -s")
+
+	if (WITH_LTO)
+		set(OPTIMIZATION_FLAGS "${OPTIMIZATION_FLAGS} -flto -fuse-linker-plugin")
+	endif()
 
 	if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9)
 		set(OPTIMIZATION_FLAGS "${OPTIMIZATION_FLAGS} -fno-associative-math")
@@ -46,7 +50,11 @@ elseif (CMAKE_CXX_COMPILER_ID MATCHES MSVC)
 elseif (CMAKE_CXX_COMPILER_ID MATCHES Clang)
 	set(GENERAL_FLAGS "-pthread")
 	set(WARNING_FLAGS "-Wall -Wextra -Wno-undefined-internal -Wunreachable-code-aggressive -Wmissing-prototypes -Wmissing-variable-declarations -Werror")
-	set(OPTIMIZATION_FLAGS "-Ofast -funroll-loops -fmerge-all-constants -flto")
+	set(OPTIMIZATION_FLAGS "-Ofast -funroll-loops -fmerge-all-constants")
+
+	if (WITH_LTO)
+		set(OPTIMIZATION_FLAGS "${OPTIMIZATION_FLAGS} -flto")
+	endif()
 
 	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${GENERAL_FLAGS} ${WARNING_FLAGS} ${OPTIMIZATION_FLAGS}")
 	set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} ${GENERAL_FLAGS} ${WARNING_FLAGS} ${OPTIMIZATION_FLAGS}")