On 08/09/2017 09:56 PM, Sam wrote: > Yes, it's because a space at the end of line: > > --- -^I2017-08-10 10:51:06.097868811 +0800$ >> +++ > but in my match, I add a space, I don't know why it doesn't work. > > AT_CHECK([[awk '/ACTIVE/' stdout | head -4]], [0], [LACP actor_state ACTIVE >> AGGREGATION SYNC COLLECTING DISTRIBUTING $ >> partner_state ACTIVE AGGREGATION SYNC COLLECTING DISTRIBUTING $ >> LACP actor_state ACTIVE AGGREGATION SYNC COLLECTING DISTRIBUTING $ >> partner_state ACTIVE AGGREGATION SYNC COLLECTING DISTRIBUTING $ >> ])$ Because autoconf eats trailing spaces by default (it's a feature). You can work around it by TELLING autoconf that you intend for there to be trailing space: AT_CHECK(..., [[trailing space preserved here: @&t@ but not here more text]]) The @&t@ quadrigraph (mnemonic 'and-t' sounds similar to 'empty') expands to nothing, but is converted after the point when trailing whitespace is eaten. The manual documents this: https://www.gnu.org/software/autoconf/manual/autoconf.html#Quadrigraphs -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3266 Virtualization: qemu.org | libvirt.org
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