[postgis-tickets] [PostGIS] #4116: Select a C standard and include in CFLAGS

[PostGIS]

#4116: Select a C standard and include in CFLAGS
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 Reporter:  dbaston  |      Owner:  pramsey
     Type:  defect   |     Status:  new
 Priority:  medium   |  Milestone:  PostGIS 2.5.0
Component:  postgis  |    Version:  trunk
 Keywords:           |
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 I made some changes that compiled without errors locally, but when I made
 a PR, Travis complained about declaring a variable inside a for loop,
 e.g.:

 `for (int i = 0)`.

 Trying to reproduce this locally, I added `-std=c89` to my `CFLAGS`, which
 indeed produced this error, but also some new errors about usage of the
 `inline` keyword. Switching to `-std=gnu89` seemed to reproduce the
 conditions of the Travis environment.

 I'd suggest that we settle on a non-GNU standard (`-std=c99` ?) and add it
 to our build flags so we can get consistent results with different
 compilers.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4116>
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