tests/cryptoauthlib: blacklist native boards

Native boards fail to link due to an upstream bug in cryptoauthlib's
test infrastructure. The file build/pkg/cryptoauthlib/test/cmd-processor.c
has incorrect conditional compilation logic:

    #if defined(_WIN32) || defined(__linux__) || defined(__APPLE__)
        int main(int argc, char* argv[]) { ... }
    #elif defined(RIOT_APPLICATION)
        int atca_run_cmd(char *command, size_t len) { ... }
    #endif

On native boards, __linux__ is defined, so the code compiles a main()
function instead of atca_run_cmd(). This conflicts with RIOT's main()
and causes linker errors:

    - multiple definition of 'main'
    - undefined reference to 'atca_run_cmd'

On ARM boards, none of these platform macros are defined, so the code
correctly falls through to the RIOT_APPLICATION branch and compiles
atca_run_cmd() instead.

The fix would require patching cryptoauthlib to check RIOT_APPLICATION
before checking platform macros, or reporting this upstream to Microchip.

Signed-off-by: Gilles DOFFE <[email protected]>

Author: gdoffe

tests/pkg/cryptoauthlib_internal-tests/Makefile

@@ -8,6 +8,13 @@ CFLAGS += -DTHREAD_STACKSIZE_MAIN=\(3*THREAD_STACKSIZE_DEFAULT\)
 # is also defined in board header files
 BOARD_BLACKLIST := stk3200 stk3600 stk3700
 
+# Native boards are blacklisted due to a bug in cryptoauthlib's cmd-processor.c
+# The file checks for __linux__ before checking for RIOT_APPLICATION, causing it
+# to compile a main() function instead of atca_run_cmd(), which conflicts with
+# RIOT's main(). This is an upstream bug in cryptoauthlib test infrastructure.
+# See: build/pkg/cryptoauthlib/test/cmd-processor.c lines 233-278
+BOARD_BLACKLIST += native native32 native64
+
 # due to memory constrains we ignore the cert test
 CFLAGS += -DDO_NOT_TEST_CERT
 USEPKG += cryptoauthlib