|Subject:||Re: shortcut of ":" but not /bin/true|
|Date:||Mon, 17 May 2004 21:45:30 -0400|
Which raises the question: why wasn't the fast path in use in the truss output I showed? The answer is apparently that the generated Perl makefiles have an explicit SHELL=/bin/sh which disables the fast path. I wonder if it would be possible to detect when assignment to SHELL is a no-op and leave fast path on? Might be harder than it seems when recursively expanded variables are involved. Unfortunately a lot of generated makefiles have this tic. In fact ISTR reading somebody's "best practices with make" paper which included an injunction to always assign SHELL=/bin/sh explicitly. Not saying I agree with that but it's out there and clearly a lot of people do.
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