继续翻译
`%' characters in pattern rules can be quoted with preceding backslashes (`\'). Backslashes that would otherwise quote `%' characters can be quoted with more backslashes. Backslashes that quote `%' characters or other backslashes are removed from the pattern before it is compared to file names or has a stem substituted into it. Backslashes that are not in danger of quoting `%' characters go unmolested. For example, the pattern `the\%weird\\%pattern\\' has `the%weird\' preceding the operative `%' character, and `pattern\\' following it. The final two backslashes are left alone because they cannot affect any `%' character. Here is an example, which compiles each of `foo.o' and `bar.o' from the corresponding `.c' file: objects = foo.o bar.o all: $(objects) $(objects): %.o: %.c $(CC) -c $(CFLAGS) $< -o $@ Here `$<' is the automatic variable that holds the name of the prerequisite and `$@' is the automatic variable that holds the name of the target; see *note Automatic Variables::.
在模式规则中的%符号可以通过反斜线被引用。反斜线也可以通过反斜线被引用。在开始比较文件名或者由一个枝干用于替换前，引用%符号的反斜线或者引用反斜线的反斜线会被模式移出。和引用 % 符号无关的反斜线被忽略。例如，模式 'the\%weird\\%pattern\\' 在 操作性的%符号前有一个前置的 'the%weird\'， 后面有一个 'pattern\\'， 最后的两个反斜线就留在那里，因为它们对 %符号没有影响。
Here is an example, which compiles each of `foo.o' and `bar.o' from
the corresponding `.c' file:
这里有一个例子，从相应的.c 文件中，编译每一个 foo.o 和 bar.o 文件。
objects = foo.o bar.o
all: $(objects)
$(objects): %.o: %.c
$(CC) -c $(CFLAGS) $< -o $@
这里，$< 是自动变量，其保存着前提条件的名字，$@是自动变量，其保留着目的的名字。
参见 *note Automatic Variables::
后文待续
本文转自健哥的数据花园博客园博客，原文链接：http://www.cnblogs.com/gaojian/archive/2012/09/26/2703353.html，如需转载请自行联系原作者
