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From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Fri, 18 Jun 2021 08:38:51 -0700
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Subject: RFC: Add GNU_PROPERTY_1_NEEDED
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 GCC Development <gcc@gcc.gnu.org>, 
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Add GNU_PROPERTY_1_NEEDED:

 #define GNU_PROPERTY_1_NEEDED      GNU_PROPERTY_UINT32_OR_LO

to indicate the needed properties by the object file.

Add GNU_PROPERTY_1_NEEDED_SINGLE_GLOBAL_DEFINITION:

 #define GNU_PROPERTY_1_NEEDED_SINGLE_GLOBAL_DEFINITION  (1U << 0)

to indicate that the object file requires canonical function pointers and
cannot be used with copy relocation.

The PDF file is at

https://gitlab.com/x86-psABIs/Linux-ABI/-/wikis/uploads/9eca2f2defe62b0c5015bf2e3e8a9f05/Linux-gABI-1_needed-2021-06-18.pdf

-- 
H.J.