【发布时间】：2022-06-11 10:09:15
【问题描述】：
我正在开发一个国际象棋引擎，最近决定重写我们的 makefile。我决定使用递归生成文件，它具有一组编译选项：
NAMING ?= 1
STATIC ?= 0
NATIVE ?= 0
DETECT ?= 1
PGO ?= 0
DEBUG ?= 0
LTO ?= 0
PEXT ?= 0
根据上面的标志，我生成了 FLAGS 来构建我的程序。我的makefile 的主要目标是build。我的 makefile 使用上面的标志并生成所有选项。从理论上讲，如果我将它称为make build PGO=1 NATIVE=1 ...，makefile 可以正常工作。现在这是我想要的行为。此外，我想到了做一个递归的 makefile，它预先定义了一些选项，例如：
native:
$(_MAKE) build DEBUG=0 NATIVE=1 PGO=0 LTO=1 DETECT=1 NAMING=$(NAMING) STATIC=$(STATIC) EXE_NAME=$(EXE_NAME)
pgo:
$(_MAKE) build DEBUG=0 NATIVE=1 PGO=1 LTO=1 DETECT=1 NAMING=$(NAMING) STATIC=$(STATIC) EXE_NAME=$(EXE_NAME)
问题是我无法覆盖递归生成文件中的那些指定变量。假设我打电话给make pgo，它会进入递归make和调用
$(_MAKE) build DEBUG=0 NATIVE=1 PGO=1 LTO=1 DETECT=1 NAMING=$(NAMING) STATIC=$(STATIC) EXE_NAME=$(EXE_NAME)
当我尝试在 makefile 中指定 PGO := 0 时，它似乎对 PGO 变量没有影响。似乎我无法以我的方式调用它时覆盖它。完整的makefile如下：
_THIS := $(realpath $(dir $(abspath $(lastword $(MAKEFILE_LIST)))))
_ROOT := $(_THIS)/..
_SRC := $(_ROOT)/src_files
_BIN := $(_ROOT)/bin
_MAKE := $(MAKE) --no-print-directory -C $(_THIS) -e
# compiler and sources
CXX = g++
_LIBS_WL := -Wl,--whole-archive -lpthread -Wl,--no-whole-archive
_LIBS := -pthread
_CXXSRCS := $(_SRC)/*.cpp
_CSRCS := $(_SRC)/syzygy/tbprobe.c
_SRCS := $(_CSRCS) $(_CXXSRCS)
# engine name and version
NAME = Koivisto
MINOR = 11
MAJOR = 8
MAKROS = -DMINOR_VERSION=$(MINOR) -DMAJOR_VERSION=$(MAJOR)
EXE_NAME = $(NAME)_$(MAJOR).$(MINOR)
EXE_DIR = $(_ROOT)/bin
EXE = $(EXE_DIR)/$(EXE_NAME)
EVALFILE = $(_ROOT)/networks/default.net
EXE_INFO =
# compilation flags
FLAGS = -std=c++17 -Wall -Wextra -Wshadow -DEVALFILE=\"$(EVALFILE)\"
MARCH_FLAG = -march=native
PGO_PRE_FLAGS = -fprofile-generate -lgcov
PGO_POST_FLAGS = -fprofile-use -fno-peel-loops -fno-tracer
# ---------------------------------------------------------------------------------------------------------------------
# COMPILATION OPTIONS AND NAME ADJUSTMENT
# ---------------------------------------------------------------------------------------------------------------------
# options
NAMING ?= 1
STATIC ?= 0
NATIVE ?= 0
DETECT ?= 1
PGO ?= 0
DEBUG ?= 0
LTO ?= 0
PEXT ?= 0
# vector instructions
AVX512 ?= 0
AVX2 ?= $(AVX512)
AVX ?= $(AVX2)
POPCNT ?= $(AVX)
SSE42 ?= $(POPCNT)
SSE41 ?= $(SSE42)
SSE3 ?= $(SSE41)
SSE2 ?= $(SSE3)
SSE ?= $(SSE2)
# adjust the exe name as well as the FLAGS
ifeq ($(PGO),1)
EXE_INFO := $(EXE_INFO)-pgo
endif
ifeq ($(DEBUG),1)
EXE_INFO := $(EXE_INFO)-debug
else
FLAGS += -DNDEBUG -O3
endif
ifeq ($(PEXT),1)
EXE_INFO := $(EXE_INFO)-pext
FLAGS += -DUSE_PEXT -mbmi2
endif
ifeq ($(LTO),1)
FLAGS += -flto
endif
ifeq ($(STATIC),1)
FLAGS += -static -static-libgcc -static-libstdc++
endif
# toggle avx options based on the highest one
ifeq ($(AVX512),1)
FLAGS += -mavx512f -mavx512bw -mavx512dq
endif
ifeq ($(AVX2),1)
FLAGS += -mavx2
endif
ifeq ($(AVX),1)
FLAGS += -mavx
endif
ifeq ($(POPCNT),1)
FLAGS += -DUSE_POPCNT -mpopcnt
endif
ifeq ($(SSE42),1)
FLAGS += -msse4.2
endif
ifeq ($(SSE41),1)
FLAGS += -msse4.1
endif
ifeq ($(SSE3),1)
FLAGS += -msse3
endif
ifeq ($(SSE2),1)
FLAGS += -msse2
endif
ifeq ($(SSE),1)
FLAGS += -msse
endif
# set name based on highest vector extension
ifeq ($(AVX512),1)
EXE_INFO := $(EXE_INFO)-avx512
else ifeq ($(AVX2),1)
EXE_INFO := $(EXE_INFO)-avx2
else ifeq ($(AVX),1)
EXE_INFO := $(EXE_INFO)-avx
else ifeq ($(POPCNT),1)
EXE_INFO := $(EXE_INFO)-popcnt
else ifeq ($(SSE42),1)
EXE_INFO := $(EXE_INFO)-sse42
else ifeq ($(SSE41),1)
EXE_INFO := $(EXE_INFO)-sse41
else ifeq ($(SSE3),1)
EXE_INFO := $(EXE_INFO)-msse3
else ifeq ($(SSE2),1)
EXE_INFO := $(EXE_INFO)-sse2
else ifeq ($(SSE),1)
EXE_INFO := $(EXE_INFO)-sse
endif
# ---------------------------------------------------------------------------------------------------------------------
# HOST DETECTION AND NAME ADJUSTMENT IF NAMING IS ACTIVE
# ---------------------------------------------------------------------------------------------------------------------
ifeq ($(OS),Windows_NT)
PREFIX := windows
SUFFIX := .exe
_LIBS += $(_LIBS_WL)
else
UNAME := $(shell uname -s)
ifeq ($(UNAME),Linux)
PREFIX := linux
SUFFIX :=
_LIBS += $(_LIBS_WL)
else
ifeq ($(UNAME),Darwin)
PREFIX := darwin
SUFFIX :=
MARCH_FLAG := -mcpu=apple-a14
else
$(warning incompatible host, this might fail)
PREFIX := _
SUFFIX :=
endif
endif
endif
ifeq ($(NAMING),1)
EXE := $(EXE_DIR)/$(EXE_NAME)-$(PREFIX)$(EXE_INFO)$(SUFFIX)
endif
EXE_FULL := $(abspath $(EXE))
FLAGS += $(MARCH_FLAG)
# auto detect certain flags
ifeq ($(DETECT),1)
PROPS = $(shell echo | $(CC) $(MARCH_FLAG) -E -dM -)
ifneq ($(findstring __BMI2__, $(PROPS)),)
ifeq ($(findstring __znver1, $(PROPS)),)
ifeq ($(findstring __znver2, $(PROPS)),)
FLAGS += $(PEXTFLAGS)
endif
endif
endif
endif
# ---------------------------------------------------------------------------------------------------------------------
# RULES
# ---------------------------------------------------------------------------------------------------------------------
ifeq ($(UNAME),Darwin)
openbench:
$(_MAKE) build DEBUG=0 NATIVE=1 PGO=0 LTO=1 DETECT=1 EVALFILE=$(EVALFILE) NAMING=0 EXE=$(EXE)
else
openbench:
$(_MAKE) build DEBUG=0 NATIVE=1 PGO=1 LTO=1 DETECT=1 EVALFILE=$(EVALFILE) NAMING=0 EXE=$(EXE)
endif
native:
$(_MAKE) build DEBUG=0 NATIVE=1 PGO=0 LTO=1 DETECT=1 NAMING=$(NAMING) STATIC=$(STATIC) EXE_NAME=$(EXE_NAME)
pgo:
$(_MAKE) build DEBUG=0 NATIVE=1 PGO=1 LTO=1 DETECT=1 NAMING=$(NAMING) STATIC=$(STATIC) EXE_NAME=$(EXE_NAME)
overview:
$(info NAME : $(NAME))
$(info EXE : $(EXE))
$(info FULL NAME : $(EXE_FULL))
$(info NAMING : $(NAMING))
$(info FLAGS : $(FLAGS))
$(info NATIVE : $(NATIVE))
$(info STATIC : $(STATIC))
$(info PEXT : $(PEXT))
$(info PGO : $(PGO))
$(info DEBUG : $(DEBUG))
$(info AVX512 : $(AVX512))
$(info AVX2 : $(AVX2))
$(info AVX : $(AVX))
$(info POPCNT : $(POPCNT))
$(info SSE42 : $(SSE42))
$(info SSE41 : $(SSE41))
$(info SSE3 : $(SSE3))
$(info SSE2 : $(SSE2))
$(info SSE : $(SSE))
build: updateNetwork overview
mkdir -p $(EXE_DIR)
ifeq ($(PGO),1)
$(CXX) $(PGO_PRE_FLAGS) $(FLAGS) $(_SRCS) $(MAKROS) $(_LIBS) -o $(EXE)
$(EXE_FULL) bench
$(CXX) $(PGO_POST_FLAGS) $(FLAGS) $(_SRCS) $(MAKROS) $(_LIBS) -o $(EXE)
@rm -f *.gcda
else
$(CXX) $(FLAGS) $(_SRCS) $(MAKROS) $(_LIBS) -o $(EXE)
endif
release:
#$(_MAKE) build DEBUG=0 PGO=1 LTO=1 DETECT=0 NAMING=1 STATIC=1 AVX512=1
$(_MAKE) build DEBUG=0 PGO=1 LTO=1 DETECT=0 NAMING=1 STATIC=1 AVX2=1
$(_MAKE) build DEBUG=0 PGO=1 LTO=1 DETECT=0 NAMING=1 STATIC=1 POPCNT=1
$(_MAKE) build DEBUG=0 PGO=1 LTO=1 DETECT=0 NAMING=1 STATIC=1 SSE42=1
$(_MAKE) build DEBUG=0 PGO=1 LTO=1 DETECT=0 NAMING=1 STATIC=1 SSE41=1
$(_MAKE) build DEBUG=0 PGO=1 LTO=1 DETECT=0 NAMING=1 STATIC=1 SSE3=1
$(_MAKE) build DEBUG=0 PGO=1 LTO=1 DETECT=0 NAMING=1 STATIC=1 SSE2=1
$(_MAKE) build DEBUG=0 PGO=1 LTO=1 DETECT=0 NAMING=1 STATIC=1 SSE=1
#$(_MAKE) build DEBUG=0 PEXT=1 PGO=1 LTO=1 DETECT=0 NAMING=1 STATIC=1 AVX512=1
$(_MAKE) build DEBUG=0 PEXT=1 PGO=1 LTO=1 DETECT=0 NAMING=1 STATIC=1 AVX2=1
$(_MAKE) build DEBUG=0 PEXT=1 PGO=1 LTO=1 DETECT=0 NAMING=1 STATIC=1 POPCNT=1
$(_MAKE) build DEBUG=0 PEXT=1 PGO=1 LTO=1 DETECT=0 NAMING=1 STATIC=1 SSE42=1
$(_MAKE) build DEBUG=0 PEXT=1 PGO=1 LTO=1 DETECT=0 NAMING=1 STATIC=1 SSE41=1
$(_MAKE) build DEBUG=0 PEXT=1 PGO=1 LTO=1 DETECT=0 NAMING=1 STATIC=1 SSE3=1
$(_MAKE) build DEBUG=0 PEXT=1 PGO=1 LTO=1 DETECT=0 NAMING=1 STATIC=1 SSE2=1
$(_MAKE) build DEBUG=0 PEXT=1 PGO=1 LTO=1 DETECT=0 NAMING=1 STATIC=1 SSE=1
# update the network
updateNetwork:
ifeq ($(EVALFILE),$(_ROOT)/networks/default.net)
git -C .. submodule update --init
endif
有谁知道我可以如何覆盖递归 makefile 中的变量？我很高兴得到任何帮助！
【问题讨论】：
-
那个makefile是very large, and most of it has no bearing on the question。我的猜测是当你
make pgo时，Make的主实例（其中目标是pgo）中PGO的值是0，而第二个实例中PGO的值（即由主实例调用，其中目标是其他东西）是1。并且您想修改此生成文件，以便第二个实例可以更改该值。如果这就是你想要的，那么问题就很简单了。是你想要的吗？ -
是的，这正是我想要的。我希望第二个实例编辑第一个实例传递的变量。
标签： makefile