使循环依赖下降（取决于执行文件？）答案

【问题标题】：make Circular dependency dropped (depending on executive file?)使循环依赖下降（取决于执行文件？）
【发布时间】：2015-03-24 20:23:54
【问题描述】：

为什么我在这段代码中出现依赖删除错误？

里面肯定有问题，但是我找不到这个问题！这里我有自动依赖生成器。这里我有自动依赖生成器。没有最后一行：

-include $(DEPFILES)

运行正常。但是当这段代码存在时，它会给我错误。

还请避免仅仅因为类似的警告消息而链接到另一个问题。他们的情况不同。

输出：

bash ./scripts/outputs.bash
bash ./scripts/simulator_outputs.bash
make: Circular /usr/include/c++/4.8/iostream <- bin/sim dependency dropped.
make: Circular /usr/include/c++/4.8/ostream <- bin/sim dependency dropped.
make: Circular /usr/include/c++/4.8/ios <- bin/sim dependency dropped.
make: Circular /usr/include/c++/4.8/iosfwd <- bin/sim dependency dropped.
make: Circular /usr/include/c++/4.8/cwchar <- bin/sim dependency dropped.
make: Circular /usr/include/c++/4.8/exception <- bin/sim dependency dropped.
make: Circular /usr/include/c++/4.8/clocale <- bin/sim dependency dropped.
make: Circular /usr/include/c++/4.8/cctype <- bin/sim dependency dropped.
make: Circular /usr/include/c++/4.8/string <- bin/sim dependency dropped.
make: Circular /usr/include/c++/4.8/new <- bin/sim dependency dropped.
make: Circular /usr/include/c++/4.8/bits/basic_string.tcc <- bin/sim dependency dropped.
make: Circular /usr/include/c++/4.8/bits/locale_classes.tcc <- bin/sim dependency dropped.
make: Circular /usr/include/c++/4.8/streambuf <- bin/sim dependency dropped.
make: Circular /usr/include/c++/4.8/bits/streambuf.tcc <- bin/sim dependency dropped.
make: Circular /usr/include/c++/4.8/cwctype <- bin/sim dependency dropped.
make: Circular /usr/include/c++/4.8/bits/locale_facets.tcc <- bin/sim dependency dropped.
make: Circular /usr/include/c++/4.8/bits/basic_ios.tcc <- bin/sim dependency dropped.
make: Circular /usr/include/c++/4.8/bits/ostream.tcc <- bin/sim dependency dropped.
make: Circular /usr/include/c++/4.8/istream <- bin/sim dependency dropped.
make: Circular /usr/include/c++/4.8/bits/istream.tcc <- bin/sim dependency dropped.
make: Circular /usr/include/c++/4.8/cmath <- bin/sim dependency dropped.
make: `VARLISTS' is up to date.

生成文件：

SOURCES := test.cpp
OUTDIR:= ./out
BINDIR:= ./bin
OBJDIR:= ./bin/obj
OBJECTS := $(addprefix $(OBJDIR)/,$(SOURCES:.cpp=.o))
DEPFILES:= $(OBJECTS:.o=.d)
VARLISTS:= ./app/outputs.list
CXX := g++
CXXFLAGS := -c -g -MD -MP

# default
%: VARLISTS $(BINDIR)/sim
    @

VARLISTS:
    bash ./scripts/outputs.bash
    bash ./scripts/simulator_outputs.bash

$(BINDIR)/sim: $(OBJECTS)
    $(CXX) $(LDFLAGS) $^ -o $@

$(OBJDIR)/%.o: %.cpp
    @if [ ! -d "$(OBJDIR)" ]; then mkdir -p $(OBJDIR) && echo "$(OBJDIR) directory created: $(OBJDIR)";  fi
    $(CXX) $(CXXFLAGS) -MF $(OBJDIR)/$*.d -o $@  $<

-include $(DEPFILES)

【问题讨论】：

%: 规则在那里做什么？它使一切都依赖于VARLISTS 和sim 二进制文件。这将使 sim 依赖于循环的任何东西。
%: 是默认规则。它应该在 make 被无参数调用时运行。它应该要求VARLISTS 和sim 都被更新。
不，默认目标是makefile中列出的第一个目标。通常是all。所以你会把all: VARLISTS sim放在那里。 % 是 match-anything rule，这相当不同。
一个问题：是针对任何规则运行，还是仅在无参数调用make 时运行？
默认目标在没有给出其他目标时运行，并且当它专门列出该目标时。它不适用于其他目标。如果您希望无论运行什么目标都运行某些东西，这有点奇怪（尽管它可能有原因），并且我认为包含的 makefile 知道如何构建是您的最佳选择。

标签： makefile dependencies circular-dependency

【解决方案1】：

问题在于%: VARLISTS $(BINDIR)/sim 行。

该行是match-anything rule，因此匹配所有目标。因此，$(BINDIR)/sim 所依赖的所有内容（没有其他目标）也将（循环地）依赖于 $(BINDIR)/sim 文件/目标。

【讨论】：