[GRASS-git] [OSGeo/grass] 9e9262: MSVC: Improve MSVC support (part 3) (#5514)

[Edouard Choinière]

  Branch: refs/heads/main
  Home:   https://github.com/OSGeo/grass
  Commit: 9e9262b9510b59d258aa78f648a08a5c659e635b
      https://github.com/OSGeo/grass/commit/9e9262b9510b59d258aa78f648a08a5c659e635b
  Author: Edouard Choinière <27212526+echoix at users.noreply.github.com>
  Date:   2026-07-17 (Fri, 17 Jul 2026)

  Changed paths:
    M lib/db/dbmi_base/dirent.c

  Log Message:
  -----------
  MSVC: Improve MSVC support (part 3) (#5514)

* define unistd only if unistd.h is not available

Co-authored-by: Edouard Choinière <27212526+echoix at users.noreply.github.com>

* fix msvc broken build (works on gcc)

Co-authored-by: Edouard Choinière <27212526+echoix at users.noreply.github.com>

* msvc: __attribute__ is gcc only

Co-authored-by: Edouard Choinière <27212526+echoix at users.noreply.github.com>

* check for _WIN32 to support msvc and mingw

* msvc: undef min max and use math.h for math constants

Co-authored-by: Rashad Kanavath <mohammedrashadkm at gmail.com>

* msvc: fix warning POINT2D_C already defined

* Remove unneeded comment about GDAL without OGR

* Apply suggestions from code review

---------

Co-authored-by: Rashad Kanavath <mohammedrashadkm at gmail.com>
Co-authored-by: Anna Petrasova <kratochanna at gmail.com>



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