From d09679a6633c9c430c4ca0a258717b57b90a6622 Mon Sep 17 00:00:00 2001
From: Ray Donnelly <mingw.android@gmail.com>
Date: Wed, 2 Dec 2020 02:15:43 +0100
Subject: [PATCH] Support MSYS2/mingw-w64

---
 configure.ac    |  8 +++++++-
 src/Makefile.am | 12 +++++++++---
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/configure.ac b/configure.ac
index 4ddc06e9..c0037420 100644
--- a/configure.ac
+++ b/configure.ac
@@ -11,7 +11,7 @@ AM_INIT_AUTOMAKE([foreign subdir-objects])
 AC_PROG_CXX
 AC_PROG_CC
 AC_PROG_CC_C99
-LT_INIT([disable-static])
+LT_INIT([disable-static win32-dll])
 
 
 AC_CONFIG_HEADERS([include/config.h])
@@ -38,6 +38,10 @@ case $host_os in
         AC_MSG_RESULT([Darwin/OSX])
         have_darwin=yes
 	;;
+    *mingw*)
+        AC_MSG_RESULT([MinGW-w64])
+        have_mingw=yes
+	;;
     *)
         AC_MSG_RESULT([ $host_os ? ... let us try])
 	;;
@@ -80,6 +84,8 @@ if test x$have_cpuflags = xyes; then
   fi
 fi
 
+AM_CONDITIONAL([HAVE_MINGW], [test x$have_mingw = xyes])
+
 # Checks for header files.
 AC_HEADER_STDC
 AC_CHECK_HEADERS([float.h inttypes.h limits.h stdlib.h string.h])
diff --git a/src/Makefile.am b/src/Makefile.am
index db6b5319..7d397c46 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -336,23 +336,29 @@ xfade0r_la_SOURCES = mixer2/xfade0r/xfade0r.cpp
 AM_CPPFLAGS = -I@top_srcdir@/include -Waddress -Wtype-limits -Wsign-compare
 AM_CFLAGS = -I@top_srcdir@/include -Waddress -Wtype-limits -Wsign-compare
 AM_CXXFLAGS = -I@top_srcdir@/include -Waddress -Wtype-limits -Wsign-compare
-AM_LDFLAGS = -module -avoid-version -lm -export-dynamic
 AM_LIBTOOLFLAGS = --tag=disable-static
 
 plugindir = @libdir@/frei0r-1
 
+if HAVE_MINGW
+SO_EXT = .dll
+AM_LDFLAGS = -module -avoid-version -export-dynamic -no-undefined
+else
+SO_EXT = .so
+AM_LDFLAGS = -module -avoid-version -lm -export-dynamic
+endif
 
 install-pluginLTLIBRARIES: $(plugin_LTLIBRARIES)
 	mkdir -p $(DESTDIR)/$(plugindir)
 	list='$(plugin_LTLIBRARIES)'; \
 	for file in $$list; do \
-	  sofile=`basename $$file .la`.so; \
+	  sofile=`basename $$file .la`$(SO_EXT); \
 	  $(INSTALL_PROGRAM) .libs/$$sofile $(DESTDIR)/$(plugindir); \
 	done
 
 uninstall-pluginLTLIBRARIES:
 	list='$(plugin_LTLIBRARIES)'; \
 	for file in $$list; do \
-	  sofile=`basename $$file .la`.so; \
+	  sofile=`basename $$file .la`$(SO_EXT); \
 	  rm -f $(DESTDIR)/$(plugindir)/$$sofile; \
 	done