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[PATCH], PowerPC target_clones minor support

Some minor changes to the PowerPC target_clones support:

1) I added a warning if target_clones was used and the compiler whas configured
with an older glibc where __builtin_cpu_supports always returns 0;

2) I reworked how the ifunc resolver function is generated, and always made it
a static function;

3) I added an executable target_clones test, and I made both clone tests
dependent on GCC being configured with a new glibc.

I have done a full bootstrap and make check test on a little endian power8
system, and there were no regressions.  I did the bootstrap using the Advance
Toolchain 10.0-3 libraries, and verified that the 2 clone tests were run.
Are these patches ok to apply to the trunk?

2017-06-28  Michael Meissner  <>

	* config/rs6000/rs6000.c
	(rs6000_get_function_versions_dispatcher): Add warning if the
	compiler is not configured to use at least GLIBC version 2.23.
	(make_resolver_func): Make resolver function private and not a
	COMDAT function.  Create the name with clone_function_name instead
	of make_unique_name.

2017-06-28  Michael Meissner  <>

	* New runtime test for
	* Add check to make sure the
	__builtin_cpu_supports function is fully supported.

Michael Meissner, IBM
IBM, M/S 2506R, 550 King Street, Littleton, MA 01460-6245, USA
email:, phone: +1 (978) 899-4797

Attachment: clone.patch13b
Description: Text document

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