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Re: [PATCH] Don't use PLT nor GOT in libc.a [BZ #20750]
On 11/04/2016 08:25 PM, H.J. Lu wrote:
On Fri, Nov 4, 2016 at 12:03 PM, Florian Weimer <firstname.lastname@example.org> wrote:
On 11/04/2016 06:47 PM, H.J. Lu wrote:
There is no need to use PLT nor GOT in libc.a to branch to a function,
regardless whether libc.a is compiled with PIC or not.
Tested on x86-64. OK for master?
Isn't this header file used outside of libc as well?
It is used for other .a files. If they aren't used to create static binaries,
PLT/GOT may be used. The resulting executable will work correctly.
You mean because “name” is automatically mapped to “name@plt”?
I find this comment not very illuminating:
+/* For libc.a, we want to branch to target directly. */
# define JUMPTARGET(name) name
And cheating the static linker in this way seems like a future