Makefile : contains string

Question

A variable returns MINGW32_NT-5.1 or CYGWIN_NT-5.1. (yea, dot at the end)

Need to compare that given var contains NT-5.1 positioned anywhere.

Using cygwin and would like to be compatible with pretty much any *nix.

Answer 1

The findstring function is what your heart desires:

$(findstring find,in) 

Searches in for 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 of findstring.

Something like:

ifneq (,$(findstring NT-5.1,$(VARIABLE)))     # Found else     # Not found endif 

What is the comma here for ifneq (,$(...?

Parse it as ifneq(A,B) where A is the empty string and B is $(findstring...). It looks odd because you don't quote strings in Makefiles.

Answer 2

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