blob: 402363dfccbc0803c91f8c390e1e7acd022c7377 (
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diff --git a/configure.ac b/configure.ac
index 9f30d29..29737da 100644
--- a/configure.ac
+++ b/configure.ac
@@ -120,6 +120,14 @@ AC_C_INLINE
# libtool
AC_PROG_CXX
+if "$os_win32" = "true"; then
+ if test "$enable_shared" = "yes"; then
+ AC_DEFINE(DLLBUILD, [], [Building a DLL])
+ else
+ AC_DEFINE(STATIC_LIBMODBUS, [], [Building a static library])
+ fi
+fi
+
# Various types
AC_TYPE_INT64_T
AC_TYPE_SIZE_T
diff --git a/src/modbus.h b/src/modbus.h
index fa7ec4a..ae204ce 100644
--- a/src/modbus.h
+++ b/src/modbus.h
@@ -25,6 +25,8 @@
# if defined(DLLBUILD)
/* define DLLBUILD when building the DLL */
# define MODBUS_API __declspec(dllexport)
+# elif defined(STATIC_LIBMODBUS)
+# define MODBUS_API
# else
# define MODBUS_API __declspec(dllimport)
# endif
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