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| author | Jonathan Nieder <jrnieder@gmail.com> | 2011-07-07 11:55:42 +0800 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2011-07-07 12:56:32 +0800 |
| commit | 66b614e29038e31745c4a5d296f64f8d64f5c377 (patch) | |
| tree | bca0ac7ca1f8b2f62aa9017412976042cbccaade /src/TOUR | |
| parent | [PARSER] Fix clobbering of checkkwd (diff) | |
| download | dash-66b614e29038e31745c4a5d296f64f8d64f5c377.tar.gz dash-66b614e29038e31745c4a5d296f64f8d64f5c377.zip | |
[EVAL] Remove unused EV_BACKCMD flag
The original ash defered forking commands in backquotes so builtins could be run in the same context as the shell. This behavior was controlled using the EV_BACKCMD to evaltree. Unfortunately, as Matthias Scheler noticed in 1999 (NetBSD PR/7814), the result was counterintuitive; for example, echo "`cd /`" would change the cwd. So ash 0.3.5 left out that optimization. The EV_BACKCMD codepath stayed around, unused. Some time between ash 0.3.5-11 and ash 0.3.8-37, Debian ash omitted the EV_BACKCMD pathway by guarding it with #ifdef notyet. In dash 0.5.1 and later, the commented code is no more. Let's finish the job and remove the last vestiges. If someone wants to work on omitting the fork in backcmd, the remaining hints are not going to be very helpful, anyway. Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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