GNU make manual 翻译( 一百一十八)

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   `%' 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::

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