On 02/06/2012 07:29 PM, Stefano Lattarini wrote: > With this commit, we introduce a new helper shell script for use > in the testsuite, which is meant to allow the test cases to easily > check whether two whitespace-separated lists are equal; this ability > is particularly useful to check for equality of the contents of make > variables that are expected to contain multiple whitespace-separated > words, and are defined through line continuations (or are rewritten > by automake in this way), or contain expansion of potentially empty > variables. > > Before this change, a test checking that an usage like this one: > > VAR = valA > if COND1 > VAR += val1 # com1 > endif COND1 > VAR += valC > > worked as expected, couldn't use rules like: > > ## Don't work because $(VAR) expands to multiple words > verify: > test $(VAR) = "valA val1 valC" > > nor like: > > ## Don't work because the final expansion of $(VAR) contains > ## repeated contiguous whitespace characters (it actually > ## equals "valA val1 valC", not "valA val1 valC"), and this > ## is an internal details which might change and which we > ## don't want to explicitly rely on. > verify: > test "$(VAR)" = "valA val1 valC" > > Instead, we had to rely on cumbersome workaround such as: > > # Works, but is ugly. > verify: > test "`echo $(VAR)`" = "valA val1 valC" > > or: > > # Works, but is even uglier. > verify: > echo BEG: $(VAR) :END | grep "BEG: valA val1 valC :END" > > Now, with the help of the new 'is' script, we can perform such a > check in a clearer and more straightforward way, as in: > > ## Works, and reads clearly. > verify: > is $(VAR) == valA val1 valC > I've pushed this patch now.
Regards, Stefano
