Allow tests to behave differently depending on whether the compiler is in-tree

And skip testwsdeque if it is not in-tree, as we rely on some headers
from the build tree.

testsuite/config/ghc

@@ -56,6 +56,8 @@ if (ghc_with_dynamic_rts == 1):
 if (ghc_with_profiling == 1 and ghc_with_threaded_rts == 1):
         config.run_ways.append('profthreaded')
 
+config.in_tree_compiler = in_tree_compiler
+
 config.way_flags = {
 	'normal'     : [],
 	'optc'       : ['-O -fvia-C'],

testsuite/driver/testglobals.py

@@ -84,6 +84,9 @@ class TestConfig:
         # Do we have shared libraries?
         self.have_shared_libs = False
 
+        # Are we testing an in-tree compiler?
+        self.in_tree_compiler = True
+
         # the timeout program
         self.timeout_prog = ''
         self.timeout = 300

testsuite/driver/testlib.py

@@ -274,6 +274,18 @@ def if_wordsize( ws, f ):
 
 # ---
 
+def if_in_tree_compiler( f ):
+    if config.in_tree_compiler:
+        return f
+    else:
+        return normal
+
+def unless_in_tree_compiler( f ):
+    if config.in_tree_compiler:
+        return normal
+    else:
+        return f
+
 def if_compiler_type( compiler, f ):
     if config.compiler_type == compiler:
         return f

testsuite/mk/boilerplate.mk

@@ -59,6 +59,7 @@ STAGE3_GHC := $(abspath $(TOP)/../inplace/bin/ghc-stage3)
 
 ifneq "$(wildcard $(STAGE1_GHC) $(STAGE1_GHC).exe)" ""
 
+IN_TREE_COMPILER = YES
 ifeq "$(BINDIST)" "YES"
 TEST_HC := $(abspath $(TOP)/../)/bindisttest/install dir/bin/ghc
 else ifeq "$(stage)" "1"
@@ -71,6 +72,7 @@ TEST_HC := $(STAGE2_GHC)
 endif
 
 else
+IN_TREE_COMPILER = NO
 TEST_HC := $(shell which ghc)
 endif
 

testsuite/mk/test.mk

@@ -91,6 +91,12 @@ else
 RUNTEST_OPTS += -e windows=False
 endif
 
+ifeq "$(IN_TREE_COMPILER)" "YES"
+RUNTEST_OPTS += -e in_tree_compiler=True
+else
+RUNTEST_OPTS += -e in_tree_compiler=False
+endif
+
 ifneq "$(THREADS)" ""
 RUNTEST_OPTS += --threads=$(THREADS)
 endif

testsuite/tests/ghc-regress/rts/all.T

@@ -43,7 +43,7 @@ test('2783', [ omit_ways(['ghci']), exit_code(1) ], compile_and_run, [''])
 
 # Test the work-stealing deque implementation.  We run this test in
 # both threaded1 (-threaded -debug) and threaded2 (-threaded) ways.
-test('testwsdeque', [
+test('testwsdeque', [unless_in_tree_compiler(skip),
                     c_src, only_ways(['threaded1', 'threaded2'])],
                     compile_and_run, ['-I../../../../rts'])