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I noticed that testing aarch64-elf gdb with a physical board ran into issues with gdb.python/py-value.exp. Further investigation showed that we were actually trying to dereference a NULL pointer (argv) when trying to access argv[0]. Being bare-metal, argv is not guaranteed to be valid. So we need to make sure argv is sane before accessing argv[0]. The following patch fixes up the test program to check for a NULL argv and also improves the testcase a bit so it doesn't have to work with a hardcoded argc value. Regression-tested on x86-64 Ubuntu 16.04. gdb/testsuite/ChangeLog: 2016-10-12 Luis Machado <lgustavo@codesourcery.com> * gdb.python/py-value.c (main): Check if argv is NULL before using it. * gdb.python/py-value.exp (test_value_in_inferior): Don't use hardcoded argc values. Add 1 to argc so we guarantee distinct initial/modified argc values.
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