[tor-bugs] #32500 [Core Tor/Tor]: consider clang -std=gnu99 in Travis for better C99 portability

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#32500: consider clang -std=gnu99 in Travis for better C99 portability
-------------------------------------------------+-------------------------
 Reporter:  catalyst                             |          Owner:  teor
     Type:  enhancement                          |         Status:
                                                 |  merge_ready
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.4.3.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  portability, tor-ci, 029-backport,   |  Actual Points:  0.2
  035-backport, 040-backport, 041-backport,      |
  042-backport                                   |
Parent ID:                                       |         Points:  0.1
 Reviewer:  catalyst                             |        Sponsor:
                                                 |  Sponsor31-can
-------------------------------------------------+-------------------------

Comment (by nickm):

 Are we doing this with all clang builds, or only some clang builds? I vote
 for "only some", since we may build differently (eg with different
 autoconf results) if we do _not_ have std=gnu99 set.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32500#comment:4>
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