generate .DEF file on Win32 systems, needed for MSVC import lib

git-svn-id: https://hamlib.svn.sourceforge.net/svnroot/hamlib/trunk@1739 7ae35d74-ebe9-4afe-98af-79ac388436b8

configure.ac

@@ -163,6 +163,10 @@ darwin* | rhapsody*)
   CFLAGS="${CFLAGS} -no-cpp-precomp"
   CXXFLAGS="${CXXFLAGS} -no-cpp-precomp"
   ;;
+mingw* | pw32* | cygwin*)
+  WINLDFLAGS="-Wl,--output-def,libhamlib.def -Wl,--add-stdcall-alias"
+  AC_SUBST([WINLDFLAGS])
+  ;;
 esac
 
 dnl Check if C99 struct initializers are supported

src/Makefile.am

@@ -5,7 +5,7 @@ RIGSRC = rig.c serial.c misc.c register.c event.c cal.c conf.c tones.c \
 
 lib_LTLIBRARIES = libhamlib.la
 libhamlib_la_SOURCES = $(RIGSRC)
-libhamlib_la_LDFLAGS = -no-undefined -release @VERSION@ -version-info @ABI_VERSION@:0:0
+libhamlib_la_LDFLAGS = $(WINLDFLAGS) -no-undefined -release @VERSION@ -version-info @ABI_VERSION@:0:0
 libhamlib_la_CFLAGS = -DIN_HAMLIB $(AM_CFLAGS) -DHAMLIB_MODULE_DIR=\"$(libdir)\"
 libhamlib_la_LIBADD = @LIBLTDL@ $(top_builddir)/lib/libmisc.la @MATH_LIBS@