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Notes on the SCFI testsuite in GAS:
* At this time, SCFI machinery is only supported for x86_64.
* When adding more tests, please keep CFI annotations updated in the .s files.
Ideally the test should be run with and without --scfi (as is done currently
for the core SCFI tests); Such workflow ensures sanity checking of the CFI
annotations.
* Note that GAS issues a warning:
"Warning: --scfi=all ignores some user-specified CFI directive"
when it encounters CFI directives in the input assembly and --scfi (=all) is
active. To bypass the noise from this warning, while keeping the testcases
useful/understandable, most tests are run twice. E.g.,
- run_dump_test "scfi-cfi-add-1" // ignores warnings
- run_list_test "scfi-cfi-add-1" "--scfi --warn" // tests warnings
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