[C++] Ignore white space around $(call) function name

Regression when compared to GNU make behaviour.

Test case:

 $ cat Makefile.call-func-name
 func = $(info called with '$(1)')
 test = $(call $(1),$(1))

 $(call test,func)
 $(call test, func)
 $(call test,func )
 $(call test, func )

 $ make -f Makefile.call-func-name
 called with 'func'
 called with ' func'
 called with 'func '
 called with ' func '
 make: *** No targets.  Stop.

 $ ckati -c --warn -f Makefile.call-func-name
 called with 'func'
 Makefile.call-func-name:5: *warning*: undefined user function:  func
 Makefile.call-func-name:6: *warning*: undefined user function: func
 Makefile.call-func-name:5: *warning*: undefined user function:  func
 *** No targets.

Fixes https://github.com/google/kati/issues/49

Change-Id: I3d982cd8d6d9777034df64540c32846300cb72f2

1 files changed, 1 insertions, 1 deletions

diff --git a/func.cc b/func.cc
index 876b274..e313c9e 100644
--- a/func.cc
+++ b/func.cc
@@ -583,7 +583,7 @@ void CallFunc(const vector<Value*>& args, Evaluator* ev, string* s) {
     Intern("5"), Intern("6"),  Intern("7"), Intern("8"), Intern("9")
   };
 
-  const string&& func_name = args[0]->Eval(ev);
+  const string&& func_name = TrimSpace(args[0]->Eval(ev)).as_string();
   Var* func = ev->LookupVar(Intern(func_name));
   if (!func->IsDefined()) {
     KATI_WARN("%s:%d: *warning*: undefined user function: %s",