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When combining variable assignments with a shell command, some older shells (notably heirloom-sh and presumably also Solaris 10 /bin/sh) have a bug which causes the assignment to alter the current execution environment whenever the command is a shell built-in. For example: % dash -c 'x=good; x=bad echo >/dev/null; echo $x' good % jsh -c 'x=good; x=bad echo >/dev/null; echo $x' bad The config.sub script contains a few commands of the form: IFS=- read ... which triggers this bug, causing the IFS assignment to persist for the remainder of the script. This can cause misbehaviour in certain cases, for example: % jsh config.sub i386-linux-gnu config.sub: test: unknown operator gnu % jsh config.sub i386-gnu/linux sed: can't read s|gnu/linux|gnu|: No such file or directory Invalid configuration `i386-gnu/linux': OS `' not recognized * config.sub: Save and restore IFS explicitly to avoid shell bugs. * doc/config.sub.1: Regenerate. Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
28 lines
864 B
Groff
28 lines
864 B
Groff
.\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.47.16.
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.TH CONFIG.SUB "1" "August 2021" "GNU config.sub (2021-08-14)" "User Commands"
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.SH NAME
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config.sub \- validate and canonicalize a configuration triplet
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.SH SYNOPSIS
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.B config.sub
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[\fI\,OPTION\/\fR] \fI\,CPU-MFR-OPSYS or ALIAS\/\fR
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.SH DESCRIPTION
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Canonicalize a configuration name.
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.SH OPTIONS
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.TP
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\fB\-h\fR, \fB\-\-help\fR
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print this help, then exit
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.TP
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\fB\-t\fR, \fB\-\-time\-stamp\fR
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print date of last modification, then exit
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.TP
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\fB\-v\fR, \fB\-\-version\fR
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print version number, then exit
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.SH "REPORTING BUGS"
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Report bugs and patches to <config\-patches@gnu.org>.
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.SH COPYRIGHT
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Copyright 1992\-2021 Free Software Foundation, Inc.
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.PP
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.br
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This is free software; see the source for copying conditions. There is NO
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warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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