linux: fix tests linking to swell

cmake_modules/wdl_linux_stub.cpp

@@ -1,2 +1,29 @@
 #include <WDL/swell/swell-types.h>
+
+// there are three ways to get at the SWELL symbols:
+//
+// - 1, SWELL_PROVIDED_BY_APP, SWELL_LOAD_SWELL_DYLIB, defined in swell-modstub-generic
+//
+//   swell symbols are looked up by dlopening libswell.so, assuming that the
+//   parent application has loaded such a library itself
+//
+// - 2, SWELL_PROVIDED_BY_APP, no SWELL_LOAD_SWELL_DYLIB, defined in swell-modstub-generic
+//
+//   the application will call SWELL_dllMain with a function that can be used
+//   to look up the symbols
+//
+// - 3, no SWELL_PROVIDED_BY_APP, defined in swell-appstub-generic
+//
+//   we compile the SWELL functions and provide them ourselves
+//
+// normally on linux we use method 1 (2 doesn't seem to work), but when testing
+// libswell doesn't exist, although the rest of the code is linked against it,
+// so the symbols will still exist. we could compile it ourselves, but we don't
+// actually need to use any of the functions for testing the non-gui parts, so
+// it's ok to enable method 2 -- swell symbols will still exist as function
+// pointers, but will be left as NULL at run-time
+#ifdef SWELL_TESTING
+#undef SWELL_LOAD_SWELL_DYLIB
+#endif
+
 #include <WDL/swell/swell-modstub-generic.cpp>

reaper-adm-extension/test/reaper_adm/CMakeLists.txt

@@ -1,6 +1,7 @@
 add_executable(testreaper_adm "")
 
 add_dependencies(testreaper_adm reaper_adm reaper_adm_dependencies)
+target_compile_definitions(testreaper_adm PUBLIC SWELL_TESTING)
 
 target_sources(testreaper_adm
     PRIVATE
@@ -56,6 +57,7 @@ add_test(
 add_executable(testacceptreaper_adm "")
 
 add_dependencies(testacceptreaper_adm reaper_adm reaper_adm_dependencies)
+target_compile_definitions(testacceptreaper_adm PUBLIC SWELL_TESTING)
 
 target_sources(testacceptreaper_adm
     PRIVATE