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Re: [PATCH v3 7/7] powerpc64le: Enable float128

On 28/06/17 18:08, Peter Bergner wrote:
> On 6/28/17 11:30 AM, Szabolcs Nagy wrote:
>> On 27/06/17 22:41, Florian Weimer wrote:
>>> * Peter Bergner:
>>>> Yes, we emit a symbol only defined by libcs that support this and
>>>> yes, __parse_hwcap_and_convert_at_platform is that symbol:
>>>>   if (cpu_builtin_p)
>>>>     {
>>>>       /* We have expanded a CPU builtin, so we need to emit a reference to
>>>>          the special symbol that LIBC uses to declare it supports the
>>>>          AT_PLATFORM and AT_HWCAP/AT_HWCAP2 in the TCB feature.  */
>>>>       switch_to_section (data_section);
>>>>       fprintf (asm_out_file, "\t.align %u\n", TARGET_32BIT ? 2 : 3);
>>>>       fprintf (asm_out_file, "\t%s %s\n",
>>>>                TARGET_32BIT ? ".long" : ".quad", tcb_verification_symbol);
>>>>     }
>>> I see, so everything is fine.  Nice!
>> well using the new builtin means glibc build will fail with old gcc.
> How so?  The usage of __builtin_cpu_supports() we're talking about is in
> libgcc's float128-ifunc.c source file, so it's not part of GLIBC's build.

ah sorry then don't mind me.

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