On 06/18/2012 09:40 AM, Vincent Torri wrote: >> But you can still be shorter than using a pushdef: >> >> option=m4_bpatsubst([[$2]], [^-Wno-], [-W]) > > does not work. Removing ^ seems to work Oh, right. That's due to the necessity of double-quoting $2 introducing extra characters to be matched by the regex. Omitting the anchor means that you will match -Wno- wherever it appears (even in -fsome-Wno-option); and if you are worried about that being a real possibility, then you can restore the anchoring effect by taking into account the double-qouting, and all without unbalancing [], by the use of the . regex: option=m4_bpatsubst([[$2]], [^\(.\)-Wno-], [\1-W]) But you are probably right that you don't have to worry about -Wno- appearing anywhere but the beginning, in which case omitting the anchor is indeed simplest. -- Eric Blake eblake@xxxxxxxxxx +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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