string Makefile : 包含字符串
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Makefile : contains string
提问by Pablo
A variable returns MINGW32_NT-5.1or CYGWIN_NT-5.1.(yea, dot at the end)
变量返回MINGW32_NT-5.1或CYGWIN_NT-5.1.（是的，末尾的点）
Need to compare that given var contains NT-5.1positioned anywhere.
需要比较给定的 var 包含NT-5.1定位在任何地方。
Using cygwin and would like to be compatible with pretty much any *nix.
使用 cygwin 并希望与几乎所有 *nix 兼容。
回答by John Kugelman
The findstringfunction is what your heart desires:
该FINDSTRING功能是你的心脏的欲望是什么：
$(findstring find,in)Searches infor an occurrence of find. If it occurs, the value is find; otherwise, the value is empty. You can use this function in a conditional to test for the presence of a specific substring in a given string. Thus, the two examples,
$(findstring a,a b c) $(findstring a,b c)produce the values
"a"and""(the empty string), respectively. See Testing Flags, for a practical application offindstring.
$(findstring find,in)搜索在为发生的发现。如果发生，则值为find；否则，该值为空。您可以在条件中使用此函数来测试给定字符串中是否存在特定子字符串。因此，这两个例子，
$(findstring a,a b c) $(findstring a,b c)分别产生值
"a"和""（空字符串）。有关的实际应用，请参阅测试标志findstring。
Something like:
就像是：
ifneq (,$(findstring NT-5.1,$(VARIABLE)))
# Found
else
# Not found
endif
What is the comma here for
ifneq (,$(...?
这里的逗号是什么意思
ifneq (,$(...？
Parse it as ifneq(A,B)where Ais the empty string and Bis $(findstring...). It looks odd because you don't quote strings in Makefiles.
将其解析为ifneq(A,B)其中A是空字符串而B是$(findstring...)。这看起来很奇怪，因为您没有在 Makefile 中引用字符串。
回答by vimjet
VARIABLE=NT-5.1_Can_be_any_string
ifeq ($(findstring NT-5.1,$(VARIABLE)),NT-5.1)
# Found
RESULT=found
else
# Not found
RESULT=notfound
endif
all:
@echo "RESULT=${RESULT} , output=$(findstring NT-5.1,$(VARIABLE))"
It matches the given string and returns
它匹配给定的字符串并返回
