8

这令人困惑。我有我的 Makefile：

OBJECTS =
INCLUDE_BUILD_PATH = /Users/wen/Projects/include

# Change compilation settings here
COMPILE = g++
override COMPILE_FLAGS += -O2

# Change linker/compiler specific settings here
LD_FLAGS :=
CC_FLAGS := -c -I$(INCLUDE_BUILD_PATH)/bigint

# Add source extensions here
SRC_EXT = cpp cc

# Add header dependencies here
HEADERS = $(wildcard *.hpp) $(wildcard $(INCLUDE_BUILD_PATH)/*/*.hh)

# Add source files here
CC_FILES = $(wildcard *.cpp) $(wildcard $(INCLUDE_BUILD_PATH)/*/*.cc)
CC_O_BUFFER = $(CC_FILES)
CC_O_BUFFER := $(CC_O_BUFFER:.cpp=.o)
CC_O_BUFFER := $(CC_O_BUFFER:.cc=.o)
OBJECTS = $(CC_O_BUFFER)

# Change .exe name here
EXE_NAME = maketest

# Link object files

$(EXE_NAME): $(OBJECTS)
    $(COMPILE) $(COMPILE_FLAGS) $(LD_FLAGS) -o $@ $^

# Build source files

define compile_rule
%.o : %.$1
        $$(COMPILE) $$(COMPILE_FLAGS) $$(CC_FLAGS) -o $$@ $$<
endef
    $(foreach EXT,$(SRC_EXT),$(eval $(call compile_rule,$(EXT))))

# Clean

clean:
    rm -f $(OBJECTS) $(EXE_NAME)

# Debug Build

debug:
    @echo "Rerun with COMPILE_FLAGS=-D_DEBUG"

# Print variables

print:
    @echo $(CC_FILES)
    @echo $(OBJECTS)
    @echo $(HEADERS)

它一开始编译成功，但后来无缘无故停止了，这是输出：

Yoshi-Air:maketest wen$ make
c++    -c -o maketest.o maketest.cpp
maketest.cpp:4:10: fatal error: 'BigIntegerLibrary.hh' file not found
#include "BigIntegerLibrary.hh"
         ^
1 error generated.

问题是，我什至没有告诉它在 Makefile 中使用“c++”，而是使用“g++”。此外，当我清除CC_FLAGS它-c仍然存在。就像Make有自己的想法一样。

如果我make print用来打印我的变量，它似乎没问题：

maketest.cpp /Users/wen/Projects/include/bigint/BigInteger.cc /Users/wen/Projects/include/bigint/BigIntegerAlgorithms.cc /Users/wen/Projects/include/bigint/BigIntegerUtils.cc /Users/wen/Projects/include/bigint/BigUnsigned.cc /Users/wen/Projects/include/bigint/BigUnsignedInABase.cc
maketest.o /Users/wen/Projects/include/bigint/BigInteger.o /Users/wen/Projects/include/bigint/BigIntegerAlgorithms.o /Users/wen/Projects/include/bigint/BigIntegerUtils.o /Users/wen/Projects/include/bigint/BigUnsigned.o /Users/wen/Projects/include/bigint/BigUnsignedInABase.o
maketest.hpp /Users/wen/Projects/include/bigint/BigInteger.hh /Users/wen/Projects/include/bigint/BigIntegerAlgorithms.hh /Users/wen/Projects/include/bigint/BigIntegerLibrary.hh /Users/wen/Projects/include/bigint/BigIntegerUtils.hh /Users/wen/Projects/include/bigint/BigUnsigned.hh /Users/wen/Projects/include/bigint/BigUnsignedInABase.hh /Users/wen/Projects/include/bigint/NumberlikeArray.hh

任何帮助或建议将不胜感激。谢谢！

更新

我更新了我print的打印预期的编译执行：

print:
    @echo $(CC_FILES)
    @echo $(OBJECTS)
    @echo $(HEADERS)
    @echo "Compiles with:"
    @echo $(COMPILE) $(COMPILE_FLAGS) $(LD_FLAGS) $(CC_FLAGS)

结果：

maketest.cpp /Users/wen/Projects/include/bigint/BigInteger.cc /Users/wen/Projects/include/bigint/BigIntegerAlgorithms.cc /Users/wen/Projects/include/bigint/BigIntegerUtils.cc /Users/wen/Projects/include/bigint/BigUnsigned.cc /Users/wen/Projects/include/bigint/BigUnsignedInABase.cc
maketest.o /Users/wen/Projects/include/bigint/BigInteger.o /Users/wen/Projects/include/bigint/BigIntegerAlgorithms.o /Users/wen/Projects/include/bigint/BigIntegerUtils.o /Users/wen/Projects/include/bigint/BigUnsigned.o /Users/wen/Projects/include/bigint/BigUnsignedInABase.o
maketest.hpp /Users/wen/Projects/include/bigint/BigInteger.hh /Users/wen/Projects/include/bigint/BigIntegerAlgorithms.hh /Users/wen/Projects/include/bigint/BigIntegerLibrary.hh /Users/wen/Projects/include/bigint/BigIntegerUtils.hh /Users/wen/Projects/include/bigint/BigUnsigned.hh /Users/wen/Projects/include/bigint/BigUnsignedInABase.hh /Users/wen/Projects/include/bigint/NumberlikeArray.hh
Yoshi-Air:maketest wen$ make print
maketest.cpp /Users/wen/Projects/include/bigint/BigInteger.cc /Users/wen/Projects/include/bigint/BigIntegerAlgorithms.cc /Users/wen/Projects/include/bigint/BigIntegerUtils.cc /Users/wen/Projects/include/bigint/BigUnsigned.cc /Users/wen/Projects/include/bigint/BigUnsignedInABase.cc
maketest.o /Users/wen/Projects/include/bigint/BigInteger.o /Users/wen/Projects/include/bigint/BigIntegerAlgorithms.o /Users/wen/Projects/include/bigint/BigIntegerUtils.o /Users/wen/Projects/include/bigint/BigUnsigned.o /Users/wen/Projects/include/bigint/BigUnsignedInABase.o
maketest.hpp /Users/wen/Projects/include/bigint/BigInteger.hh /Users/wen/Projects/include/bigint/BigIntegerAlgorithms.hh /Users/wen/Projects/include/bigint/BigIntegerLibrary.hh /Users/wen/Projects/include/bigint/BigIntegerUtils.hh /Users/wen/Projects/include/bigint/BigUnsigned.hh /Users/wen/Projects/include/bigint/BigUnsignedInABase.hh /Users/wen/Projects/include/bigint/NumberlikeArray.hh
Compiles with:
g++ -O2 -c -I/Users/wen/Projects/include/bigint

这证明 make 知道我想要什么，但是当它构建时它完全不同：c++而不是g++?!

更新 2：

c++调用 clang，安装在我的系统上。

Alex B 的解决方案：

但从编译命令行看来，Make 正在尝试使用隐式后缀规则，并忽略了您的模式规则。

我试过.SUFFIXES:了，是的，它报告发现没有规则。谢谢，我去看看说明书。

4

1 回答 1

2

As I stated in the comment, it works in my environment (Mac OSX, GNU Make 3.81), so the issue may be that the makefile you've posted is incomplete or you are using a different version of Make.

But from the compilation command line it looks like Make is trying to use the implicit suffix rule, and ignores your pattern rule.

You can tell Make to ignore default rules by specifying an empty list of suffixes, so you can debug your issue further.

.SUFFIXES:
于 2012-12-20T05:03:20.633 回答