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pure and const function attributes

From: Marc Nieper-Wißkirchen
Subject: pure and const function attributes
Date: Wed, 29 Apr 2020 16:28:22 +0200

Some GNULIB modules (e.g. xsize) use constructs like:

#if __GNUC__ >= 3
__attribute__ ((__pure__))

I am wondering whether it makes sense to add two new modules, named
pure and const that define macros GL_PURE and GL_CONST, respectively
that expand into nothing for a compiler that does not support these
function attributes and into the relevant code for a compiler that

-- Marc

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