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If several `vpath' patterns match the prerequisite file's name, then `make' processes each matching `vpath' directive one by one, searching all the directories mentioned in each directive. `make' handles multiple `vpath' directives in the order in which they appear in the makefile; multiple directives with the same pattern are independent of each other.
Thus,
vpath %.c foo
vpath % blish
vpath %.c bar
will look for a file ending in `.c' in `foo', then `blish', then `bar',
while
vpath %.c foo:bar
vpath % blish
will look for a file ending in `.c' in `foo', then `bar', then `blish'.
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如果有几个 vpath 模式匹配前提条件文件名，那么make 会一个接一个地处理每个 vpath 指令，搜索每一个指令中提到的目录。make 按照多个 vpath 指令在makefile 中出现的顺序处理 vpath 指令；拥有相同模式的 指令也彼此独立。
vpath %.c foo
vpath % blish
vpath %.c bar
将要寻找 foo目录中 以 .c 结尾的文件，然后是blish 目录, 然后是 bar目录。
而
vpath %.c foo:bar
vpath % blish
将寻找 foo,bar blish 目录中的 以.c 结尾的文件。
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/2012/09/19/2693980.html，如需转载请自行联系原作者
