tests: simplify: assume 'ghc' works, drop use of STACKYAMLOPT

Author: simonmichael

Makefile

@@ -6,19 +6,14 @@ export LANG = en_US.UTF-8
 # which stack.yaml file (& ghc version) to use, can be overridden by STACK env var
 STACKYAML ?= stack.yaml
 
-# used below and also in tests which run stack
-STACKYAMLOPT = --stack-yaml=$(STACKYAML)
-
 # the current base stack command
-STACK = stack --silent $(STACKYAMLOPT)
+STACK = stack --stack-yaml=$(STACKYAML)
+# STACK = stack --silent --stack-yaml=$(STACKYAML)
 
 # the shelltest executable built with current stack
 SHELLTESTEXE = $(shell $(STACK) path --local-install-root)/bin/shelltest
 
-# the base shelltest command with common options,
-# and the STACKYAMLOPT env var which helps any tests
-# which run stack themselves (eg large-output.test)
-SHELLTEST = STACKYAMLOPT="$(STACKYAMLOPT)" $(SHELLTESTEXE) --exclude /_ -j16 --hide-successes
+SHELLTEST = $(SHELLTESTEXE) --exclude /_ -j16 --hide-successes
 
 # standard targets