From 37990e63c4751493f9c2af8c46e0c230a49e286f Mon Sep 17 00:00:00 2001
From: Dana Robinson <43805+derobins@users.noreply.github.com>
Date: Sun, 11 Jun 2023 17:39:15 -0700
Subject: Make some changes to configure.ac to suppor MinGW (#3096)

Adds some H5pubconf.h entries and cpp flags for building on MinGW
using the Autotools.

Also updates the Windows-related H5pubconf.h comments to be more
accurate in CMake.
---
 config/cmake/H5pubconf.h.in | 4 ++--
 configure.ac                | 7 ++++++-
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/config/cmake/H5pubconf.h.in b/config/cmake/H5pubconf.h.in
index 4c80cd3..a5f0b05 100644
--- a/config/cmake/H5pubconf.h.in
+++ b/config/cmake/H5pubconf.h.in
@@ -14,13 +14,13 @@
 #ifndef H5_CONFIG_H_
 #define H5_CONFIG_H_
 
-/* Define if the Windows virtual file driver should be compiled */
+/* Define if this is a Windows machine */
 #cmakedefine H5_HAVE_WINDOWS @H5_HAVE_WINDOWS@
 
 /* Define if using MinGW */
 #cmakedefine H5_HAVE_MINGW @H5_HAVE_MINGW@
 
-/* Define if on the Windows platform and default WIN32 API */
+/* Define if on the Windows platform and using the Win32 API */
 #cmakedefine H5_HAVE_WIN32_API @H5_HAVE_WIN32_API@
 
 /* Define if using a Windows compiler (i.e. Visual Studio) */
diff --git a/configure.ac b/configure.ac
index a545435..7e4addc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1461,7 +1461,12 @@ case "$host_cpu-$host_vendor-$host_os" in
     ## VFD on Linux systems.
     H5_CPPFLAGS="-D_GNU_SOURCE $H5_CPPFLAGS"
     ;;
-
+  *mingw*)
+    AC_DEFINE([HAVE_WINDOWS], [1], [Define if this is a Windows machine])
+    AC_DEFINE([HAVE_WIN32_API], [1], [Define if on the Windows platform using the Win32 API])
+    AC_DEFINE([HAVE_MINGW], [1], [Define if using MinGW])
+    H5_CPPFLAGS="-D_GNU_SOURCE -D__USE_MINGW_ANSI_STDIO $H5_CPPFLAGS"
+    ;;
 esac
 
 ## Need to add the AM_ and H5_ into CFLAGS/CPPFLAGS to make them visible
-- 
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