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Should I define _GNU_SOURCE?

From: Victor Porton
Subject: Should I define _GNU_SOURCE?
Date: Mon, 22 Jan 2018 17:55:50 +0200

I am writing a software for Linux/Unix which could benefit from
execvpe() C function.

But this function is defined only when -D_GNU_SOURCE.

Question 1: Should I ALWAYS use -D_GNU_SOURCE for compiler options no
matter what are user options?

Question 2: Should I check existence of execvpe() by checking
or with AC_CHECK_FUNC(execvpe)?

Question 3: Other advice?

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