[PostGIS] #5733: Mixed use of compilers to build sources

[PostGIS]

#5733: Mixed use of compilers to build sources
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  Reporter:  strk    |      Owner:  strk
      Type:  defect  |     Status:  new
  Priority:  medium  |  Milestone:  PostGIS 3.4.3
 Component:  build   |    Version:  3.4.x
Resolution:          |   Keywords:
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Comment (by robe):

 @strk we need to remove PGXS from our logic.  We should do so before
 PostGIS 3.5.  I thought I had this ticketed somewhere.

 The plan of PostgreSQL group is to get rid of PGXS and autoconf in favor
 of Meson. They've already switched most of their buildfarms to test using
 meson.  E.g there msys/mingw no longer tests with autoconf, uses meson
 strictly. Last I checked they are working out some kinks with VS Studio
 (the usual problem child).

 That said I believe Meson is the official build tool for PG17 and up.
 Come PG18 or later, they plan to completely remove autoconf.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5733#comment:4>
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