On 06/14/2012 05:36 PM, Vincent Torri wrote: > > Hey > > I pass -Wno-foo as a parameter of an m4 macro. What I would like is to > store into a variable -Wfoo, so removing 'no-' > > Is it possible with the m4 macro string manipulation ? If not, what's > the best solution ? m4_bpatsubst([[$1]], [no-]) will delete the first instance of the regular expression 'no-' (if any) from parameter $1. Yes, the first argument is double-quoted, so that the output of m4_bpatsubst will still be single-quoted. > > Another related question: if I pass -Wbar, I would like to know if it > begins by '-Wno-'. How can I do that with m4 ? m4_if(m4_index([$1], [-Wno-]), 0, [yes...], [no...]) -- Eric Blake eblake@xxxxxxxxxx +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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