Errored: libvirt/libvirt#3219 (master - fdd941e)

[Travis CI]

Build Update for libvirt/libvirt
-------------------------------------

Build: #3219
Status: Errored

Duration: 52 mins and 28 secs
Commit: fdd941e (master)
Author: Daniel P. Berrangé
Message: build: workaround behaviour regression in gnu make 4.3

We need the "$(space)" variable to contain a single whitespace
character. We do this by assigning and then appending an empty
string to the variable. Variable appends get separated by a
single whitespace historically, but GNU make 4.3 introduced a
behaviour regression.

  https://lists.gnu.org/archive/html/bug-make/2020-01/msg00057.html

[quote]
* WARNING: Backward-incompatibility!
  Previously appending using '+=' to an empty variable would
  result in a value starting with a space.  Now the initial
  space is only added if the variable already contains some
  value.  Similarly, appending an empty string does not
  add a trailing space.
[/quote]

This patch tries a new trick to get a single whitespace by
getting make to expand two non-existant variables separated
by a space.

Reviewed-by: Eric Blake <eblake at redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange at redhat.com>

View the changeset: https://github.com/libvirt/libvirt/compare/7a34e04d82ba...fdd941eeb25f

View the full build log and details: https://travis-ci.org/github/libvirt/libvirt/builds/663039626?utm_medium=notification&utm_source=email

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