继续翻译
7.3 Conditionals that Test Flags ================================ You can write a conditional that tests `make' command flags such as `-t' by using the variable `MAKEFLAGS' together with the `findstring' function (*note Functions for String Substitution and Analysis: Text Functions.). This is useful when `touch' is not enough to make a file appear up to date. The `findstring' function determines whether one string appears as a substring of another. If you want to test for the `-t' flag, use `t' as the first string and the value of `MAKEFLAGS' as the other. For example, here is how to arrange to use `ranlib -t' to finish marking an archive file up to date: archive.a: ... ifneq (,$(findstring t,$(MAKEFLAGS))) +touch archive.a +ranlib -t archive.a else ranlib archive.a endif The `+' prefix marks those recipe lines as "recursive" so that they will be executed despite use of the `-t' flag. *Note Recursive Use of `make': Recursion.
7.3 测试标志的条件式
================================
你可以写一个测试 make 命令标志的条件式，如通过使用findstring函数处理变量 MAKEFLAGS 来测试标志 -t (*note Functions for String Substitution and Analysis: Text Functions.)。
findstring 函数决定是否一个字符串作为子串出现在另一个字符串中。如果你想要测试 -t 标志，使用t 作为findstring的第一个参数，MAKEFLAGS 作为另一个参数。
例如，这里有一个如何使用 ranlib -t 来 完成 标记某个库为最新的例子：
archive.a: ...
ifneq (,$(findstring t,$(MAKEFLAGS)))
+touch archive.a
+ranlib -t archive.a
else
ranlib archive.a
endif
+前缀标记那些片段行为递归，因此无论是否使用了-t 标记，它们都将会被执行。*Note Recursive Use of make: Recursion.
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/2012/10/09/2716181.html，如需转载请自行联系原作者
