[tor-bugs] #19821 [Core Tor/Tor]: --expensive-hardening makes configure check for curve25519-donna-c64 to fail

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#19821: --expensive-hardening makes configure check for curve25519-donna-c64 to
fail
--------------------------+------------------------------
 Reporter:  yurivict271   |          Owner:
     Type:  defect        |         Status:  new
 Priority:  Medium        |      Milestone:
Component:  Core Tor/Tor  |        Version:  Tor: 0.2.8.6
 Severity:  Normal        |     Resolution:
 Keywords:                |  Actual Points:
Parent ID:                |         Points:
 Reviewer:                |        Sponsor:
--------------------------+------------------------------

Comment (by yurivict271):

 This is the command line that I picked from config.log in OP.
 When -fsanitize=address -fsanitize=undefined is removed it succeeds.
 Otherwise I don't know much about sanitizer.

 Compiler is clang 3.4.1

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19821#comment:2>
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