driver: Make -no-keep-o-files -no-keep-hi-files work in --make mode

It seems like it was just an oversight to use the incorrect DynFlags
(global rather than local) when implementing these two options. Using
the local flags allows users to request these intermediate files get
cleaned up, which works fine in --make mode because

1. Interface files are stored in memory
2. Object files are only cleaned at the end of session (after link)

Fixes #21349

5 files changed, 24 insertions, 2 deletions

diff --git a/testsuite/tests/driver/Makefile b/testsuite/tests/driver/Makefile
index b30c8a77cb..30ca61b8e5 100644
--- a/testsuite/tests/driver/Makefile
+++ b/testsuite/tests/driver/Makefile
@@ -755,11 +755,11 @@ T16476b:
 	echo '-XCPP' >> unit-a
 	echo '-DTEST' >> unit-a
 	echo 'T16476b.hs' >> unit-a
-	
+
 	echo '--make' > resp
 	echo '-unit' > resp
 	echo '@unit-a' > resp
-	
+
 	"$(TEST_HC)" $(TEST_HC_OPTS) -v0 @resp
 	./T16476b
 
@@ -767,3 +767,9 @@ T16476b:
 T20569:
 	"$(TEST_HC)" $(TEST_HC_OPTS) -c T20569/A.hs -i -iT20569 -hidir=interface
 	"$(TEST_HC)" $(TEST_HC_OPTS) -c T20569/B.hs -i -iT20569 -hidir=interface
+
+.PHONY: T21349
+T21349:
+	"$(TEST_HC)" $(TEST_HC_OPTS) -v0 Main -working-dir T21349
+	[ ! -f T21349/B.o ] || (echo "object file exists" && exit 2)
+	[ ! -f T21349/B.hi ] || (echo "interface file exists" && exit 2)
diff --git a/testsuite/tests/driver/T21349/A.hs b/testsuite/tests/driver/T21349/A.hs
new file mode 100644
index 0000000000..bc9832431c
--- /dev/null
+++ b/testsuite/tests/driver/T21349/A.hs
@@ -0,0 +1,5 @@
+module A where
+
+import B
+
+foo = b
diff --git a/testsuite/tests/driver/T21349/B.hs b/testsuite/tests/driver/T21349/B.hs
new file mode 100644
index 0000000000..30dbdafcc1
--- /dev/null
+++ b/testsuite/tests/driver/T21349/B.hs
@@ -0,0 +1,5 @@
+{-# OPTIONS_GHC -no-keep-hi-files #-}
+{-# OPTIONS_GHC -no-keep-o-files #-}
+module B where
+
+b = ()
diff --git a/testsuite/tests/driver/T21349/Main.hs b/testsuite/tests/driver/T21349/Main.hs
new file mode 100644
index 0000000000..ce96eb7408
--- /dev/null
+++ b/testsuite/tests/driver/T21349/Main.hs
@@ -0,0 +1,5 @@
+module Main where
+
+import A
+
+main = print foo
diff --git a/testsuite/tests/driver/all.T b/testsuite/tests/driver/all.T
index 35ee56dc52..3dc704a19d 100644
--- a/testsuite/tests/driver/all.T
+++ b/testsuite/tests/driver/all.T
@@ -307,3 +307,4 @@ test('patch-level2', normal, compile, ['-Wcpp-undef'])
 test('T16476a', normal, makefile_test, [])
 test('T16476b', normal, makefile_test, [])
 test('T20569', extra_files(["T20569/"]), makefile_test, [])
+test('T21349', extra_files(['T21349']), makefile_test, [])