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Re: bad file descriptor / bad substitution

From: Paul Eggert
Subject: Re: bad file descriptor / bad substitution
Date: Fri, 1 Jan 2021 17:46:29 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.5.0

On 1/1/21 3:56 PM, Thien-Thi Nguyen wrote:
Is this a simple case of user error (‘AC_CHECK_DECLS’
should be m4-quoted)

Yes. That AC_CHECK_DECLS expands into a string that contains this line:

  # freestanding implementations, so test against a dummy

and the comma is treated as an argument separator for AC_CHECK_HEADER. Quoting fixes the bug.

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