Tom de Vries be36c6e337 [gdb/testsuite] Fix gdb.base/gold-gdb-index.exp
When running test-case gdb.base/gold-gdb-index.exp on openSUSE Tumbleweed,
I run into:
...
FAIL: gdb.base/gold-gdb-index.exp: maint info symtabs
...

This is due to a dummy .gdb_index:
...
Contents of the .gdb_index section:

Version 7

CU table:

TU table:

Address table:

Symbol table:
...

The dummy .gdb_index is ignored when loading the symbols, and instead partial
symbols are used.  Consequently, we get the same result as if we'd removed
-Wl,--gdb-index from the compilation.

Presumably, gold fails to generate a proper .gdb_index because it lacks
DWARF5 support.

Anyway, without a proper .gdb_index we can't test the gdb behaviour we're
trying to excercise.  Fix this by detecting whether we actually used a
.gdb_index for symbol loading.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2021-07-14  Tom de Vries  <tdevries@suse.de>

	* lib/gdb.exp (have_index): New proc.
	* gdb.base/gold-gdb-index.exp: Use have_index.
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		   README for GNU development tools

This directory contains various GNU compilers, assemblers, linkers, 
debuggers, etc., plus their support routines, definitions, and documentation.

If you are receiving this as part of a GDB release, see the file gdb/README.
If with a binutils release, see binutils/README;  if with a libg++ release,
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It is now possible to automatically configure and build a variety of
tools with one command.  To build all of the tools contained herein,
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	./configure 
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	make

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