On 03/18/2016 05:39 AM, Petre Pircalabu wrote: > Please disregard this question. The m4 preprocessing is done before > "configure", so the m4 preprocessor has no way of knowing about the > variable. Correct - you were mixing two languages (m4 and shell), and which gets run when. >> m4_set_add([food], [fish]) >> m4_set_add([food], [steak]) >> m4_set_add([food], [junk]) >> >> meal=junk >> >> AC_MSG_CHECKING([whether we have junk food for dinner]) >> m4_set_contains([food], [$meal], [VAL="yes"], [VAL="no"]) The literal string '$meal' (at m4-time) is NOT in the set, so the m4 result of the expansion is always going to trigger the 'VAL="no"' branch. If you want to see if the contents of a shell variable are in a shell set, then m4_set_* is not the right construct to be using. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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