exec-file-mismatch and native-gdbserver testing

Hello,

I noticed an issue when running tests that use standard_temp_file with the native-gdbserver board.

In gdb_remote_download, when called without tofile argument, as it is, for example, when starting gdbserver via gdb_reload, we set the filename to standard_output_file [file tail $fromfile] and copy the file.

GDB and gdbserver now use a copy of the same file at different locations.

This triggers an exec-file-mismatch warning and, with the default “ask” setting, a user prompt that isn’t handled by the tests and eventually leads to a timeout.  This can be seen with all tests that use gdb_simple_compile, e.g. via skip_*_test calls.  An example would be gdb.btrace/*.exp.

In exec.c:validate_exec_file (), we check the filenames and, if they differ, print a warning and re-load the symbol file.

Should validate_exec_file () check more than just the filenames?
Should gdb_simple_compile use standard_output_file instead of standard_temp_file?

Regards,
Markus.

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