Web11 apr. 2024 · $ make echo hi1.txt hi2.txt hi3.txt hi1.txt hi2.txt hi3.txt But, then I've seen some Makefiles use %.txt as a wildcard. So I tried that next. foo.txt: %.txt echo $^ However, this results in an error. $ make make: *** No rule to make target '%.txt', needed by 'foo.txt'. Stop. Can someone explain why this is happening? GNU Make 4.3 make gnu-make Web10 mrt. 2024 · Makefile 中的 wildcard 和 patsubst 是两种重要的函数,它们用于规则定义中的模式匹配。 - wildcard:这个函数用于扩展通配符,并返回与通配符匹配的文件列表。例如,`wildcard *.c` 将返回当前目录下所有以 .c 结尾的文件名列表。
Makefile学习4 - if函数_to_be_better_wen的博客-CSDN博客
Web24 dec. 2024 · Override built-in rules of GNU make that use a wildcard target. This can speeds things up significantly as we don't need to stat() so many files. GNU make does that by default to see if it can retrieve their contents from RCS or SCCS. See [1] for an old mailing list discussion about how to disable these. The speed-up may wary. Web11 apr. 2024 · wildcard. patsubst. clean. 3个自动变量. 模式规则. 静态模式规则. 伪目标. 附加变量-n-f. 命名:makefile或者Makefile,方便于make命令直接执行。 1个规则. 目标的时间必须晚于依赖条件的时间,否则,更新目标。 依赖条件如果不存在,找寻新的规则去产生依赖条件。 目标 ... charlotte nc weather nws
【Makefile】学习if wildcard foreach_等风来不如迎风去的博客 …
Web在Makefile规则中,通配符会被自动展开。 但在变量的定义和函数引用时,通配符将失效。 这种情况下如果需要通配符有效,就需要使用函数“wildcard”,它的用法是:$ (wildcard PATTERN...) 。 在Makefile中,它被展开为已经存在的、使用空格分开的、匹配此模式的所有文件列表。 如果不存在任何符合此模式的文件,函数会忽略模式字符并返回空。 需要 … Web13 apr. 2016 · Makefile:6: Preexisting file: wildcard returned 'subdir/a.foo' wildcard returned 'subdir/a.foo' ls returned 'subdir/a.foo subdir/b.foo' Notice now that make appears to be behaving like the first example above, the subdir/b.foo file that was made by the Makefile is invisible to $(wildcard) and doesn't appear even though it was created and ls ... Web28 mrt. 2012 · Makefile – Check if a file exists using wildcard function March 28, 2012 by Pratik Sinha · 2 Comments The following snippet of code can be used to check for the existence of a file from within a Makefile. ifneq ( "$ (wildcard $ (PATH_TO_FILE))", "" ) FILE_EXISTS = 1 else FILE_EXISTS = 0 endif Quoting from make documentation. $ … charlotte nc weather 15-day