configure: Don't depend upon alex in source dist build

Authored by bgamari on Sep 18 2019, 10:50 PM.

Description

configure: Don't depend upon alex in source dist build

This fixes Trac #16860 by verifying that the generated sources don't already
exist before asserting that the alex executable was found. This
replicates the logic already used for happy in the case of alex.

(cherry picked from commit 68dc96a00cc1f4d4d0d5f6520b0ce8f5c240b752)

Details

Committed
bgamariSun, Nov 3, 2:24 PM
Parents
rGHCc4cfb7071491: Fix new compact block allocation in allocateForCompact
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