fdpgen: CMake: define NEATOGEN_EXPORTS

fdpgen is part of the neato_layout plugin.

Fixes errors like this using CMake with MinGW:

fdpgen.lib(clusteredges.obj) : error LNK2019: unresolved external symbol __imp_Plegal_arrangement referenced in function compoundEdges [C:\Users\magja\graphviz\build\plugin\neato_layout\gvplugin_neato_layout.vcxproj]

Towards https://gitlab.com/graphviz/graphviz/-/issues/2058

diff --git a/lib/fdpgen/CMakeLists.txt b/lib/fdpgen/CMakeLists.txt
index d6952dbc1b120d7ae5a345aa6414a37db71f1832..b29f26cc5f0b3e56f4605976e4afa0fcaf2c7820 100644 (file)
--- a/lib/fdpgen/CMakeLists.txt
+++ b/lib/fdpgen/CMakeLists.txt
@@ -1,3 +1,5 @@
+add_definitions(-DNEATOGEN_EXPORTS=1)
+
 add_library(fdpgen STATIC
     # Header files
     clusteredges.h