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Re: [PATCH] configure.ac: Avoid empty subexpression in grep

From: Paul Eggert <eggert at cs dot ucla dot edu>
To: Alexey Neyman <stilor at att dot net>, libc-alpha at sourceware dot org
Date: Sun, 12 Mar 2017 00:50:25 -0800
Subject: Re: [PATCH] configure.ac: Avoid empty subexpression in grep
Authentication-results: sourceware.org; auth=none
References: <8370e47b-8475-a19d-def9-2cac565eb48c@att.net> <12572e7c-59f0-7c00-640a-b84c9f488491@cs.ucla.edu> <20170312015319.GI31094@vapier>

Mike Frysinger wrote:

why not just use an ERE then ?
	if $READELF -S conftest.so | grep -E '\.rela?\.dyn' >/dev/null; then


Sure, that works too.

replace all the /dev/null redirects with a -q flag.


That also works.

Follow-Ups:
- [PATCH v3] configure.ac: Avoid empty subexpression in grep
  - From: Alexey Neyman

References:
- [PATCH] configure.ac: Avoid empty subexpression in grep
  - From: Alexey Neyman
- Re: [PATCH] configure.ac: Avoid empty subexpression in grep
  - From: Paul Eggert
- Re: [PATCH] configure.ac: Avoid empty subexpression in grep
  - From: Mike Frysinger

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