Makefile : contains string

string makefile conditional-statements
Pablo picture Pablo · Apr 30, 2010 · Viewed 65.1k times · Source

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

John Kugelman picture John Kugelman · Apr 30, 2010

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.

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