Swap round the compare commands in the test suite.

The '--compare' option to test-driver.py takes two arguments
indicating things to diff (either files, or the standard output of the
command under test), and diffs them the obvious way round, that is,
with input #1 shown on the '-' side of the unified diff syntax and
input #2 on the '+' side.

When the diff is showing the discrepancy between a program's expected
and real output, I think it's generally sensible to show the real
output on the '+' side, and the expected output as '-'. That
convention matches, for example, what you'd get if you had the true
output committed in source control and ran 'git diff' or similar to
show how the rewritten version differed.

But all the comparisons in tests/CMakeLists.txt were written
backwards, so the convention was opposite. And I just scratched my
head for 20 minutes over a test failure, because I assumed the
convention in the previous paragraph, and was trying to figure out how
the source code I was looking at could possibly produce the text on
the '+' side of the diff! But it hadn't: it had produced the '-' side
instead.

Reversed all the comparisons so that they make sense.

tests/CMakeLists.txt

@@ -47,7 +47,7 @@ set(test_driver_cmd ${python_exe} ${CMAKE_CURRENT_SOURCE_DIR}/test-driver.py
 # exprtest.ref.
 add_test(NAME exprtest
   COMMAND ${test_driver_cmd}
-      --compare stdout reffile:${CMAKE_CURRENT_SOURCE_DIR}/exprtest.ref
+      --compare reffile:${CMAKE_CURRENT_SOURCE_DIR}/exprtest.ref stdout
       ${CMAKE_BINARY_DIR}/exprtest --infile ${CMAKE_CURRENT_SOURCE_DIR}/exprtest.txt
   )
 
@@ -56,12 +56,12 @@ add_test(NAME exprtest
 # mode flag.
 add_test(NAME parsertest
   COMMAND ${test_driver_cmd}
-      --compare stdout reffile:${CMAKE_CURRENT_SOURCE_DIR}/parsertest.ref
+      --compare reffile:${CMAKE_CURRENT_SOURCE_DIR}/parsertest.ref stdout
       ${CMAKE_BINARY_DIR}/parsertest ${CMAKE_CURRENT_SOURCE_DIR}/parsertest.txt
   )
 add_test(NAME parsertest-implicit-thumb
   COMMAND ${test_driver_cmd}
-      --compare stdout reffile:${CMAKE_CURRENT_SOURCE_DIR}/parsertest-implicit-thumb.ref
+      --compare reffile:${CMAKE_CURRENT_SOURCE_DIR}/parsertest-implicit-thumb.ref stdout
       ${CMAKE_BINARY_DIR}/parsertest --implicit-thumb ${CMAKE_CURRENT_SOURCE_DIR}/parsertest-implicit-thumb.txt
   )
 
@@ -72,13 +72,13 @@ add_test(NAME parsertest-implicit-thumb
 add_test(NAME indextest-li
   COMMAND ${test_driver_cmd}
       --tempfile indextest.tarmac.index
-      --compare stdout reffile:${CMAKE_CURRENT_SOURCE_DIR}/indextest-li.ref
+      --compare reffile:${CMAKE_CURRENT_SOURCE_DIR}/indextest-li.ref stdout
       ${CMAKE_BINARY_DIR}/tarmac-indextool --index indextest.tarmac.index --omit-index-offsets --seq-with-mem ${CMAKE_CURRENT_SOURCE_DIR}/indextest.tarmac --li
   )
 add_test(NAME indextest-bi
   COMMAND ${test_driver_cmd}
       --tempfile indextest.tarmac.index
-      --compare stdout reffile:${CMAKE_CURRENT_SOURCE_DIR}/indextest-bi.ref
+      --compare reffile:${CMAKE_CURRENT_SOURCE_DIR}/indextest-bi.ref stdout
       ${CMAKE_BINARY_DIR}/tarmac-indextool --index indextest.tarmac.index --omit-index-offsets --seq-with-mem ${CMAKE_CURRENT_SOURCE_DIR}/indextest.tarmac --bi
   )
 
@@ -121,13 +121,13 @@ add_test(NAME callinfo-endianness-mismatch
 add_test(NAME calltree-no-symbols
   COMMAND ${test_driver_cmd}
       --tempfile quicksort.tarmac.index
-      --compare stdout reffile:${CMAKE_CURRENT_SOURCE_DIR}/calltree-quicksort-addr.ref
+      --compare reffile:${CMAKE_CURRENT_SOURCE_DIR}/calltree-quicksort-addr.ref stdout
       ${CMAKE_BINARY_DIR}/tarmac-calltree --index quicksort.tarmac.index ${CMAKE_CURRENT_SOURCE_DIR}/quicksort.tarmac
   )
 add_test(NAME calltree-symbols
   COMMAND ${test_driver_cmd}
       --tempfile quicksort.tarmac.index
-      --compare stdout reffile:${CMAKE_CURRENT_SOURCE_DIR}/calltree-quicksort-symbols.ref
+      --compare reffile:${CMAKE_CURRENT_SOURCE_DIR}/calltree-quicksort-symbols.ref stdout
       ${CMAKE_BINARY_DIR}/tarmac-calltree --index quicksort.tarmac.index --image ${CMAKE_CURRENT_SOURCE_DIR}/quicksort.elf ${CMAKE_CURRENT_SOURCE_DIR}/quicksort.tarmac
   )
 
@@ -140,13 +140,13 @@ add_test(NAME calltree-symbols
 add_test(NAME flamegraph-no-symbols
   COMMAND ${test_driver_cmd}
       --tempfile quicksort.tarmac.index
-      --compare outfile:flamegraph-quicksort-addr.txt reffile:${CMAKE_CURRENT_SOURCE_DIR}/flamegraph-quicksort-addr.ref
+      --compare reffile:${CMAKE_CURRENT_SOURCE_DIR}/flamegraph-quicksort-addr.ref outfile:flamegraph-quicksort-addr.txt
       ${CMAKE_BINARY_DIR}/tarmac-flamegraph --index quicksort.tarmac.index ${CMAKE_CURRENT_SOURCE_DIR}/quicksort.tarmac -o flamegraph-quicksort-addr.txt
   )
 add_test(NAME flamegraph-symbols
   COMMAND ${test_driver_cmd}
       --tempfile quicksort.tarmac.index
-      --compare stdout reffile:${CMAKE_CURRENT_SOURCE_DIR}/flamegraph-quicksort-symbols.ref
+      --compare reffile:${CMAKE_CURRENT_SOURCE_DIR}/flamegraph-quicksort-symbols.ref stdout
       ${CMAKE_BINARY_DIR}/tarmac-flamegraph --index quicksort.tarmac.index --image ${CMAKE_CURRENT_SOURCE_DIR}/quicksort.elf ${CMAKE_CURRENT_SOURCE_DIR}/quicksort.tarmac
   )
 
@@ -156,13 +156,13 @@ add_test(NAME flamegraph-symbols
 add_test(NAME profile-no-symbols
   COMMAND ${test_driver_cmd}
       --tempfile quicksort.tarmac.index
-      --compare stdout reffile:${CMAKE_CURRENT_SOURCE_DIR}/profile-quicksort-addr.ref
+      --compare reffile:${CMAKE_CURRENT_SOURCE_DIR}/profile-quicksort-addr.ref stdout
       ${CMAKE_BINARY_DIR}/tarmac-profile --index quicksort.tarmac.index ${CMAKE_CURRENT_SOURCE_DIR}/quicksort.tarmac
   )
 add_test(NAME profile-symbols
   COMMAND ${test_driver_cmd}
       --tempfile quicksort.tarmac.index
-      --compare stdout reffile:${CMAKE_CURRENT_SOURCE_DIR}/profile-quicksort-symbols.ref
+      --compare reffile:${CMAKE_CURRENT_SOURCE_DIR}/profile-quicksort-symbols.ref stdout
       ${CMAKE_BINARY_DIR}/tarmac-profile --index quicksort.tarmac.index --image ${CMAKE_CURRENT_SOURCE_DIR}/quicksort.elf ${CMAKE_CURRENT_SOURCE_DIR}/quicksort.tarmac
   )
 
@@ -173,7 +173,7 @@ add_test(NAME profile-symbols
 add_test(NAME vcd-no-date
   COMMAND ${test_driver_cmd}
       --tempfile quicksort.tarmac.index
-      --compare outfile:quicksort-nodate.vcd reffile:${CMAKE_CURRENT_SOURCE_DIR}/vcd-quicksort-nodate.ref
+      --compare reffile:${CMAKE_CURRENT_SOURCE_DIR}/vcd-quicksort-nodate.ref outfile:quicksort-nodate.vcd
       ${CMAKE_BINARY_DIR}/tarmac-vcd --index quicksort.tarmac.index ${CMAKE_CURRENT_SOURCE_DIR}/quicksort.tarmac --no-date -o quicksort-nodate.vcd
   )
 
@@ -189,34 +189,34 @@ add_test(NAME vcd-date
 # Test class Argparse.
 add_test(NAME Argparse-help
   COMMAND ${test_driver_cmd}
-      --compare stdout reffile:${CMAKE_CURRENT_SOURCE_DIR}/argparse-help.ref
+      --compare reffile:${CMAKE_CURRENT_SOURCE_DIR}/argparse-help.ref stdout
       ${CMAKE_BINARY_DIR}/argparsetest --help
   )
 add_test(NAME Argparse-short
   COMMAND ${test_driver_cmd}
-      --compare stdout reffile:${CMAKE_CURRENT_SOURCE_DIR}/argparse.ref
+      --compare reffile:${CMAKE_CURRENT_SOURCE_DIR}/argparse.ref stdout
       ${CMAKE_BINARY_DIR}/argparsetest -s -v 2 arg1 multi1 multi2
   )
 add_test(NAME Argparse-long
   COMMAND ${test_driver_cmd}
-      --compare stdout reffile:${CMAKE_CURRENT_SOURCE_DIR}/argparse.ref
+      --compare reffile:${CMAKE_CURRENT_SOURCE_DIR}/argparse.ref stdout
       ${CMAKE_BINARY_DIR}/argparsetest --switch --value 2 arg1 multi1 multi2
   )
 add_test(NAME Argparse-via
   COMMAND ${test_driver_cmd}
-      --compare stdout reffile:${CMAKE_CURRENT_SOURCE_DIR}/argparse.ref
+      --compare reffile:${CMAKE_CURRENT_SOURCE_DIR}/argparse.ref stdout
       ${CMAKE_BINARY_DIR}/argparsetest --via-file ${CMAKE_CURRENT_SOURCE_DIR}/argparse-via.txt
   )
 add_test(NAME Argparse-via-override
   COMMAND ${test_driver_cmd}
-      --compare stdout reffile:${CMAKE_CURRENT_SOURCE_DIR}/argparse-via-override.ref
+      --compare reffile:${CMAKE_CURRENT_SOURCE_DIR}/argparse-via-override.ref stdout
       ${CMAKE_BINARY_DIR}/argparsetest --via-file ${CMAKE_CURRENT_SOURCE_DIR}/argparse-via.txt --value 10
   )
 
 # Test btod.
 add_test(NAME btod
   COMMAND ${test_driver_cmd}
-      --compare stdout reffile:${CMAKE_CURRENT_SOURCE_DIR}/btod.ref
+      --compare reffile:${CMAKE_CURRENT_SOURCE_DIR}/btod.ref stdout
       ${CMAKE_BINARY_DIR}/btodtest
   )