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Tom de Vries cdeba395cf [gdb/testsuite] Fix gdb.arch/i386-gnu-cfi.exp
When running test-case gdb.arch/i386-gnu-cfi.exp with target board unix/-m32, I get:
...
(gdb) up 3^M
79      abort.c: No such file or directory.^M
(gdb) FAIL: gdb.arch/i386-gnu-cfi.exp: shift up to the modified frame
...

The preceding backtrace looks like this:
...
(gdb) bt^M
 #0  0xf7fcf549 in __kernel_vsyscall ()^M
 #1  0xf7ce8896 in __libc_signal_restore_set (set=0xffffc3bc) at \
     ../sysdeps/unix/sysv/linux/internal-signals.h:104^M
 #2  __GI_raise (sig=6) at ../sysdeps/unix/sysv/linux/raise.c:47^M
 #3  0xf7cd0314 in __GI_abort () at abort.c:79^M
 #4  0x0804919f in gate (gate=0x8049040 <abort@plt>, data=0x0) at gate.c:3^M
 #5  0x08049176 in main () at i386-gnu-cfi.c:27^M
...
with function gate at position #4, while on another system where the test passes,
I see instead function gate at position #3.

Fix this by capturing the position of function gate in the backtrace, and
using that in the rest of the test instead of hardcoded constant 3.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2021-01-28  Tom de Vries  <tdevries@suse.de>

	* gdb.arch/i386-gnu-cfi.exp: Capture the position of function gate
	in the backtrace, and use that in the rest of the test instead of
	hardcoded constant 3.  Use "frame" instead of "up" for robustness.
2021-01-28 17:39:32 +01:00
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