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From: Mark L. <la...@mi...> - 2003-06-06 00:44:56
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Parsing the output of 'gmake --version' isn't going to be easy if Mr Stallman keeps changing the format of the version blurb. You could change the regexp to /gnu make (?:version )?(\S+)/i To solve the version numbering scheme problem, you can use the 'v' notation and string comparisons. example: $v = eval "v$1"; die if (($v cmp v3.78.6) < 0); (of course, double up the $ if you put this in a makefile) The "v" notation is only available in perl 5.6.0 and after. It creates a string of bytes (so it won't be useful for TeX's version counting...). It is useful for generating IPv4 addresses too. -Mark Mark Lakata, Staff Engineer 1225 Charleston Road voice 650-567-5170 MIPS Technologies Mountain View CA 94043 fax 650-567-5002 On Thu, 5 Jun 2003, Ted Stern wrote: > On 4 Jun 2003, Mark Lakata wrote: > > > > Makefile.versiondep: FORCE > > @(perl -e '($$v) = `gmake --version` =~/version (\S+),/; die "old > > make detected, found $v, need 3.78\n" if $$v < 3.78' && touch $@ ) || ( rm > > -f $@; false ) > > The perl arithmetic comparison is fragile -- what about GNU make version lines > that return as follows? > > GNU make 3.80 > GNU Make version 3.79.1 > > Ted > -- > Ted Stern Applications Group > Cray Inc. office: 206-701-2182 > 411 First Avenue South, Suite 600 cell: 206-383-1049 > Seattle, WA 98104-2860 FAX: 206-701-2500 > > Frango ut patefaciam -- I break that I may reveal > (The Paleontological Society motto, equally apropos for debugging) > |
