How to generate total report base on stmt+mcdc

[dlt-lee]

Hi
I use the following command to generate total unit report base on stmt+mcdc. But I still need --units/--scos.,why?
bjuci@bjuci-ThinkPad-X270-W10DG:~/github/gtest-demo/build$ gnatcov run --level=stmt+decision ./bin/unit_tests --routines=f
warning: Support for coverage of non-instrumented native programs is deprecated and will disappear after GNATcoverage 21 releases. You are encouraged to migrate to instrumentation-based coverage: you can read more about it in our documentation: http://docs.adacore.com/gnatcoverage-docs/html/gnatcov.html
Running main() from gtest_main.cc
[==========] Running 2 tests from 1 test case.
[----------] Global test environment set-up.
[----------] 2 tests from example
[ RUN ] example.add
[ OK ] example.add (10 ms)
[ RUN ] example.subtract
[ OK ] example.subtract (1 ms)
[----------] 2 tests from example (19 ms total)

[----------] Global test environment tear-down
[==========] 2 tests from 1 test case ran. (56 ms total)
[ PASSED ] 2 tests.
bjuci@bjuci-ThinkPad-X270-W10DG:~/github/gtest-demo/build$ gnatcov coverage --level=stmt+mcdc --annotate=html unit_tests.trace --routines=f
gnatcov: Please specify SCOs on the command line, specifying Units in project or using --units/--scos.
Usage: gnatcov coverage [OPTIONS] TRACE_FILEs
Run 'gnatcov coverage --help' for more information.