From 9684bdb556f46a358cb9f05ec3dd5d34b0bd81a2 Mon Sep 17 00:00:00 2001
From: Harald Oehlmann <oehhar@sourceforge.net>
Date: Wed, 12 Dec 2018 09:37:56 +0100
Subject: [PATCH] Ticket 134: do some CMake corrections told to be ok by the
 ticket author. No test by me.

---
 backend/CMakeLists.txt | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/backend/CMakeLists.txt b/backend/CMakeLists.txt
index b71da66d..7a94fe1a 100644
--- a/backend/CMakeLists.txt
+++ b/backend/CMakeLists.txt
@@ -25,7 +25,17 @@ set_target_properties(zint PROPERTIES 	SOVERSION "${ZINT_VERSION_MAJOR}.${ZINT_V
 if(PNG_FOUND)
     target_link_libraries(zint ${PNG_LIBRARIES} )
 endif(PNG_FOUND)
-target_link_libraries(zint -lm)
+if(NOT MSVC)
+  # Link with standard C math library.
+  target_link_libraries(zint m)
+endif(NOT MSVC)
+
+if(MSVC)
+  # "BUILD_SHARED_LIBS" is a CMake defined variable, see documentation.
+  if(BUILD_SHARED_LIBS)
+    add_definitions("-DDLL_EXPORT")
+  endif(BUILD_SHARED_LIBS)
+endif(MSVC)
 
 install(TARGETS zint  ${INSTALL_TARGETS_DEFAULT_ARGS} )
 install(FILES zint.h DESTINATION ${INCLUDE_INSTALL_DIR} COMPONENT Devel)