GNU make: Makefile一次构建多个.cpp文件

GNU make: Makefile Build Multiple .cpp Files at Once

本文关键字：构建 一次 文件 cpp make Makefile GNU      更新时间：2023-10-16

这是一个具体情况下的具体问题。

我有:

SRC = 
  CartoCursor.cpp 
  CartoOperatorFactory.cpp 
  CurveHelper.cpp 
  $(NULL)
CXX = g++
CC_FLAGS = -fPIC -Wall
SYMB_OBJ_DIR = ./obj/symb_obj
SYMB_X_INCLUDE = -I../../../MYLIBS
SYMB_X_OBJS = $(SRC:%.cpp=$(SYMB_OBJ_DIR)/%.o)
all : libSymbolXLib.a
libSymbolXLib.a : $(SYMB_X_OBJS)
        rm -f $@

$(SYMB_OBJ_DIR)/%.o : %.cpp
        $(CXX) -c $(CC_FLAGS) $(SYMB_X_INCLUDE) -o $(INT_DIR)/$*.o $?

当我运行这个时，我得到以下错误:

make[1]: *** No rule to make target `obj/symb_obj/CartoCursor.o', needed by `libSymbolXLib.a'.  Stop.

我需要做什么才能让libSymbolXLib识别通用构建规则?

如果不清楚，请告诉我。

使用:

CXX = g++
CC_FLAGS = -fPIC -Wall
SYMB_OBJ_DIR = ./obj/symb_obj
SYMB_X_INCLUDE = -I../../../MYLIBS
SYMB_X_OBJS = $(SRC:%.cpp=$(SYMB_OBJ_DIR)/%.o)
all : libSymbolXLib.a
libSymbolXLib.a : $(SYMB_X_OBJS)
        ar rcs $@ $^
$(SYMB_OBJ_DIR)/%.o : %.cpp
        $(CXX) -c $(CC_FLAGS) $(SYMB_X_INCLUDE) -o $@ $
[mehoggan@hogganz400 Core]$ make
mkdir -p ./libs
mkdir -p ./obj/symb_obj
make -f ./Graphic/SymbolXLib/Makefile
make[1]: Entering directory `/home/mehoggan/arcgis-new/GraphicsCore_Dev/Runtime/Core'
make[1]: *** No rule to make target `obj/symb_obj/CartoCursor.o', needed by `libSymbolXLib.a'.  Stop.
make[1]: Leaving directory `/home/mehoggan/arcgis-new/GraphicsCore_Dev/Runtime/Core'
make: *** [build_symbol_x_lib] Error 2
[mehoggan@hogganz400 Core]$ make --version
GNU Make 3.81
Copyright (C) 2006  Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
This program built for x86_64-redhat-linux-gnu
[mehoggan@hogganz400 Core]$ uname -a
Linux hogganz400.esri.com 2.6.32-71.el6.x86_64 #1 SMP Wed Sep 1 01:33:01 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
[mehoggan@hogganz400 Core]$ cat /etc/redhat-release 
Red Hat Enterprise Linux Server release 6.0 (Santiago)
[mehoggan@hogganz400 Core]$

看起来很像INT_DIR和$?使用的变量不合适。我希望这样:

$(SYMB_OBJ_DIR)/%.o : %.cpp
    $(CXX) -c $(CC_FLAGS) $(SYMB_X_INCLUDE) -o $@ $<

您将需要更新libSymbolXLib的ar规则。a也不只是rm:)

下面的例子在我的系统上运行得很好:

SRC = 
      CartoCursor.cpp 
      CartoOperatorFactory.cpp 
      CurveHelper.cpp 
      $(NULL)
CXX = g++
CC_FLAGS = -fPIC -Wall
SYMB_OBJ_DIR = ./obj/symb_obj
SYMB_X_INCLUDE = -I../../../MYLIBS
SYMB_X_OBJS = $(SRC:%.cpp=$(SYMB_OBJ_DIR)/%.o)
all : libSymbolXLib.a
libSymbolXLib.a : $(SYMB_X_OBJS)
    ar rcs $@ $^
$(SYMB_OBJ_DIR)/%.o : %.cpp
    $(CXX) -c $(CC_FLAGS) $(SYMB_X_INCLUDE) -o $@ $<
演示:

$ touch CartoCursor.cpp CartoOperatorFactory.cpp CurveHelper.cpp
$ mkdir -pv obj/symb_obj
$ make 

g++ -c -fPIC -Wall -I../../../MYLIBS -o obj/symb_obj/CartoCursor.o CartoCursor.cpp
g++ -c -fPIC -Wall -I../../../MYLIBS -o obj/symb_obj/CartoOperatorFactory.o CartoOperatorFactory.cpp
g++ -c -fPIC -Wall -I../../../MYLIBS -o obj/symb_obj/CurveHelper.o CurveHelper.cpp
ar rcs libSymbolXLib.a obj/symb_obj/CartoCursor.o obj/symb_obj/CartoOperatorFactory.o obj/symb_obj/CurveHelper.o

$ file libSymbolXLib.a 

libSymbolXLib.a: current ar archive

确保CartoCursor.cpp存在于您运行Make的目录中。

同样，根据Paul的Makefiles规则，您应该修改$(SYMB_OBJ_DIR)/%.o : %.cpp的recipe以使用目标的确切名称更新文件，即:

$(SYMB_OBJ_DIR)/%.o : %.cpp
    $(CXX) -c $(CC_FLAGS) $(SYMB_X_INCLUDE) -o $@ $^

乌利希期刊指南。

同样适用于libSymbolXLib.a的recipe，它必须更新目标文件。您可以插入touch $@存根用于调试，或者像@sehe提到的那样添加适当的配方:

libSymbolXLib.a : $(SYMB_X_OBJS)
    ar rcs $@ $^
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