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Re: RFC: Check IFUNC_XXX to enable/disable ifunc feature
- From: Carlos O'Donell <carlos at redhat dot com>
- To: "H.J. Lu" <hjl dot tools at gmail dot com>, GNU C Library <libc-alpha at sourceware dot org>, Siddhesh Poyarekar <sid at reserved-bit dot com>
- Date: Sun, 26 Jun 2016 14:56:54 -0400
- Subject: Re: RFC: Check IFUNC_XXX to enable/disable ifunc feature
- Authentication-results: sourceware.org; auth=none
- References: <CAMe9rOq1KakWO6bTb7LORhT1+3LRBoxtzV44NPstusAmy2+j_w at mail dot gmail dot com> <466674fe-b5b3-e254-2350-3aca10c25d81 at redhat dot com>
On 06/26/2016 02:55 PM, Carlos O'Donell wrote:
> On 06/26/2016 10:50 AM, H.J. Lu wrote:
>> I'd like to check IFUNC_XXX environmental variable to enable/disable
>> the ifunc feature, XXX. That is
>> 1. IFUNC_XXX=1 to enable XXX.
>> 2. IFUNC_XXX=0 to disable XXX.
>> Any comments?
> How would it work? Does it just mean that the IFUNC selector bypasses
> the disabled choices?
> Also it does not meet Tunables consensus:
> "Tunable namespace should be clearly defined"
> Should perhaps be "GLIBC_<VER>_IFUNC_<ARCH>_<PUBLIC_IFUNC_NAME>"?
Or as suggested a single env-var GLIBC_TUNABLES="glbibc_2.24_x86-64_sse3=0;..."
processed by some scripts to enable disable tunables.