Various mingwin patches contributed by Norman Vine.

configure.in

@@ -34,11 +34,6 @@ AC_PROG_RANLIB
 AC_PROG_INSTALL
 AC_PROG_LN_S
 
-# Check to see if this `configure' is being run in the `Cygwin32' environment
-AC_CYGWIN
-AC_MINGW32
-AC_EXEEXT
-
 AR="ar"
 OS=`uname -s`
 if test "$OS" = "IRIX" -o "$OS" = "IRIX64"; then
@@ -102,19 +97,31 @@ AM_CONDITIONAL(ENABLE_JPEG_SERVER, test "x$with_jpeg_factory" = "xyes")
 dnl Check for MS Windows environment
 AC_CHECK_HEADER(windows.h)
 
-if test "x$HOSTTYPE" != "xmacintosh" ; then
+AC_EGREP_CPP(yes,
+[#ifdef __MINGW32__
+ yes
+ #endif
+],is_mingw=yes, is_mingw=no)
+
+echo "IS_MINGW = "$is_mingw
+AM_CONDITIONAL(IS_MINGW, test $is_mingw="yes")
+
+AC_EGREP_CPP(yes,
+[#ifdef __CYGWIN__
+ yes
+ #endif
+],is_cygwin=yes, is_cygwin=no)
+
+echo "IS_CYGWIN = "$is_cygwin
+AM_CONDITIONAL(IS_CYGWIN, test $is_cygwin="yes")
+
+if test "x$HOSTTYPE" != "xmacintosh" -a "x$is_mingw" != "xyes"; then
     dnl extra library and include directories
     EXTRA_DIRS="/usr/local /usr/local/plib /usr/X11R6"
 
     if test -d /opt/X11R6 ; then
         EXTRA_DIRS="$EXTRA_DIRS /opt/X11R6"
     fi
-
-    if test "x$ac_cv_header_windows_h" = "xyes" ; then
-        if test -d /usr/mingw/usr ; then
-            EXTRA_DIRS="$EXTRA_DIRS /usr/mingw/usr"
-        fi
-    fi
 fi
 
 wi_EXTRA_DIRS(no, ${EXTRA_DIRS})
@@ -141,10 +148,6 @@ null_LIBS="$LIBS"
 
 AC_CHECK_LIB(m, cos)
 
-if test  "x$ac_cv_mingw32" = "xyes" ; then
-    LIBS="$LIBS -lwsock32"
-fi
-
 base_LIBS="$LIBS"
 
 dnl Thread related checks
@@ -240,8 +243,8 @@ else
 
     LIBS="$LIBS -l${WIN32_GLUT} -l${WIN32_GLU} -l${WIN32_OPENGL}"
     LIBS="$LIBS -luser32 -lgdi32"
-    if test  "x$ac_cv_mingw32" = "xyes" ; then
-	LIBS="$LIBS -wsock32"
+    if test "x$is_mingw" = "xyes" ; then
+        EXTRA_DIRS="${EXTRA_DIRS}"
     fi
     echo "Will link apps with $LIBS"
 fi

simgear/io/Makefile.am

@@ -26,6 +26,12 @@ else
 INCLUDES = -I$(top_srcdir)
 endif
 
+if IS_MINGW
+NETWORK_LIB = -lwsock32
+else
+NETWORK_LIB =
+endif
+
 noinst_PROGRAMS = decode_binobj socktest lowtest
 
 socktest_SOURCES = socktest.cxx
@@ -51,4 +57,4 @@ decode_binobj_LDADD = \
         $(top_builddir)/simgear/misc/libsgmisc.a \
         $(top_builddir)/simgear/debug/libsgdebug.a \
 	$(top_builddir)/simgear/xml/libsgxml.a \
-        -lz
+         $(NETWORK_LIB) -lz

simgear/io/socktest.cxx

@@ -41,6 +41,10 @@ int main() {
 	if ( s.readline( buf, 256 ) > 0 ) {
 	    cout << "result = " << buf;
 	}
+#ifdef __MINGW32__
+	Sleep(100);
+#else
 	sleep(1);
+#endif
     }
 }

simgear/sg_inlines.h

@@ -28,11 +28,13 @@
 #ifndef _SG_INLINES_H
 #define _SG_INLINES_H
 
+// return the sign of a value
 template <class T>
 inline const int SG_SIGN(const T x) {
     return x < T(0) ? -1 : 1;
 }
 
+// return the minimum of two values
 template <class T>
 inline const T SG_MIN2(const T a, const T b) {
     return a < b ? a : b;
@@ -44,6 +46,7 @@ inline const T SG_MIN3( const T a, const T b, const T c) {
     return (a < b ? SG_MIN2 (a, c) : SG_MIN2 (b, c));
 }
 
+// return the maximum of two values
 template <class T>
 inline const T SG_MAX2(const T a, const T b) {
     return  a > b ? a : b;
@@ -55,10 +58,47 @@ inline const T SG_MAX3 (const T a, const T b, const T c) {
     return (a > b ? SG_MAX2 (a, c) : SG_MAX2 (b, c));
 }
 
-// 
+// return the minimum and maximum of three values
+template <class T>
+inline void SG_MIN_MAX3 ( T &min, T &max, const T a, const T b, const T c) {
+    if( a > b ) {
+        if( a > c ) {
+            max = a;
+            min = SG_MIN2 (b, c);
+        } else {
+            max = c;
+            min = SG_MIN2 (a, b);
+        }
+    } else {
+        if( b > c ) {
+            max = b;
+            min = SG_MIN2 (a, c);
+        } else {
+            max = c;
+            min = SG_MIN2 (a, b);
+        }
+    }
+}
+
+// swap two values
 template <class T>
 inline void SG_SWAP( T &a, T &b) {
     T c = a;  a = b;  b = c;
 }
 
+// clamp a value to lie between min and max
+template <class T>
+inline void SG_CLAMP_RANGE(T &x, const T min, const T max ) {
+    if ( x < min ) { x = min; }
+    if ( x > max ) { x = max; }
+}
+
+// normalize a value to lie between min and max
+template <class T>
+inline void SG_NORMALIZE_RANGE( T &val, const T min, const T max ) {
+    T step = max - min;
+    while( val >= max )  val -= step;
+    while( val < min ) val += step;
+};
+
 #endif // _SG_INLINES_H

simgear/timing/sg_time.cxx

@@ -363,14 +363,11 @@ double sgTimeCurrentMJD( long int warp ) {
 
 #if defined(_MSC_VER) || defined(__MINGW32__)
     struct tm m_gmt;    // copy of system gmtime(&time_t) structure
+    struct tm *gmt = &m_gmt;
 #else
     struct tm *gmt;
 #endif
 
-#if defined(_MSC_VER) || defined(__MINGW32__)
-    tm * gmt = &m_gmt;
-#endif
-
     // get current Unix calendar time (in seconds)
     // warp += warp_delta;
     time_t cur_time = time(NULL) + warp;