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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>