Dump non-module specific info to file #20316

- Change the dumpPrefix to FilePath, and default to non-module
- Add dot to seperate dump-file-prefix and suffix
- Modify user guide to introduce how dump files are named
- This commit does not affect Ghci dump file naming.

See also #17500

4 files changed, 17 insertions, 0 deletions

diff --git a/testsuite/tests/driver/Makefile b/testsuite/tests/driver/Makefile
index 58d35b5a06..0542f9de47 100644
--- a/testsuite/tests/driver/Makefile
+++ b/testsuite/tests/driver/Makefile
@@ -733,3 +733,9 @@ T20084:
 	# Don't compile
 	"$(TEST_HC)" $(TEST_HC_OPTS) T20084.hs
 
+.PHONY: T20316
+T20316:
+	echo 'main = print "Hello World"' > T20316.hs
+	"$(TEST_HC)" $(TEST_HC_OPTS) -fno-code T20316.hs -ddump-to-file -ddump-timings;
+	echo "*** non-module.dump-timings ***"
+	cat non-module.dump-timings | grep alloc | sed 's/alloc.*//'
diff --git a/testsuite/tests/driver/T20316.stderr b/testsuite/tests/driver/T20316.stderr
new file mode 100644
index 0000000000..ef979dec18
--- /dev/null
+++ b/testsuite/tests/driver/T20316.stderr
@@ -0,0 +1,6 @@
+*** initializing unit database:
+*** Chasing dependencies:
+*** Parser [Main]:
+*** Renamer/typechecker [Main]:
+*** Desugar [Main]:
+*** CoreTidy [Main]:
diff --git a/testsuite/tests/driver/T20316.stdout b/testsuite/tests/driver/T20316.stdout
new file mode 100644
index 0000000000..280a3c80e7
--- /dev/null
+++ b/testsuite/tests/driver/T20316.stdout
@@ -0,0 +1,4 @@
+[1 of 1] Compiling Main             ( T20316.hs, nothing )
+*** non-module.dump-timings ***
+initializing unit database: 
+Chasing dependencies: 
diff --git a/testsuite/tests/driver/all.T b/testsuite/tests/driver/all.T
index 742f74f953..4af15b7640 100644
--- a/testsuite/tests/driver/all.T
+++ b/testsuite/tests/driver/all.T
@@ -301,3 +301,4 @@ test('T20459', normal, multimod_compile_fail,
      ['T20459B', ''])
 test('T20200loop', extra_files(['T20200loop']), multimod_compile,
      ['Datatypes', '-iT20200loop -O -v0'])
+test('T20316', normal, makefile_test, [])