Diagnose #49 0.8.3 fails to load on Linux/Mono

.gitignore

@@ -158,3 +158,13 @@ src/libfiles
 
 inst/libs/*.*
 inst/libs/i386/*.*
+
+*.so
+
+*.o
+
+.ionide/
+
+mono_crash.*.json
+
+src/Makevars

docs/devnotes.md

@@ -0,0 +1,43 @@
+
+Setting up native rClr.so debugging from vs code.
+
+`launch.json`
+
+```json
+        {
+            // Adapted from debugging a native lib loaded by Python
+            // https://code.visualstudio.com/docs/cpp/launch-json-reference
+            // Not used as such but looking like a useful source: https://www.justinmklam.com/posts/2017/10/vscode-debugger-setup/
+            // Maybe: https://marketplace.visualstudio.com/items?itemName=webfreak.debug
+            // https://stackoverflow.com/questions/31763639/how-to-prevent-gdb-from-loading-debugging-symbol-for-a-large-library
+            // I follow the instructions in https://developer.mozilla.org/en-US/docs/Archive/Mozilla/Using_gdb_on_wimpy_computers . May need adaptation to make it 
+            // Nope. Need to use symbolLoadInfo below, but still stuck on libc6 exception
+            // https://gist.github.com/asroy/ca018117e5dbbf53569b696a8c89204f
+            "name": "(gdb) Attach to R session",
+            "type": "cppdbg",
+            "request": "attach",
+            // "program": "/home/per202/src/csiro/stash/water-apportionment-pk/fortran/lib/libwaa.so",
+            "program": "/usr/local/lib/R/bin/exec/R",
+            "processId": "${command:pickProcess}",
+            "MIMode": "gdb",
+            "miDebuggerPath": "gdb",
+            // "cwd": "/home/per202/src/csiro/stash/water-apportionment-pk/fortran/lib",
+            "additionalSOLibSearchPath": "/home/per202/.local/lib/R/3.6.2/site-library/rClr/libs",
+            "symbolLoadInfo":{
+                "loadAll": false,
+                "exceptionList": "rClr.so"
+            },
+            "setupCommands": [
+                {
+                    "description": "Enable pretty-printing for gdb",
+                    "text": "-enable-pretty-printing",
+                    "ignoreFailures": true
+                }
+            ]
+        }
+```
+
+```bash
+export BUILDTYPE=Debug
+R CMD INSTALL --no-test-load rClr
+```

src/Makevars.in

@@ -72,6 +72,7 @@ ifeq "$(BUILDTYPE)" "Release"
 BuildConfiguration=Unix
 else
 BuildConfiguration=UnixDebug
+GDEBUG_FLAGS = -ggdb3 -Og # See e.g. https://gcc.gnu.org/onlinedocs/gcc-4.5.4/gcc/Debugging-Options.html#Debugging-Options
 endif  ## ifeq "$(BUILDTYPE)" "Release"
 
 PKG_CFLAGS_LOCAL=`pkg-config --cflags $(MONO_LIB) glib-2.0`
@@ -102,7 +103,7 @@ clean:
 	${RM} $(OBJECTS) $(SHLIB) $(RCLR_LIBS)
 
 rClrMono.o:
-	$(CXX) -std=c++11 $(ALL_CPPFLAGS) $(ALL_CFLAGS) -c rClr.cpp -o rClrMono.o -lsupc++
+	$(CXX) $(GDEBUG_FLAGS) -std=c++11 $(ALL_CPPFLAGS) $(ALL_CFLAGS) -c rClr.cpp -o rClrMono.o -lsupc++
 	###### NOTE:
 	# On a CentOS OS, I needed to use the following. The CPP and C flags would otherwise return two options not understood:
 	# -xHOST -fp-model precise  
@@ -111,7 +112,7 @@ rClrMono.o:
 	# $(CXX) -std=c++11 -I/apps/R/3.1.1/lib64/R/include -DNDEBUG  -I/usr/local/include `pkg-config --cflags mono-2 glib-2.0` -g -D MONO_CLR -D MONO_INST -fpic  -O3 -openmp -c rClr.cpp -o rClrMono.o -lsupc++
 
 rClrMono$(SHLIB_EXT): rClrMono.o
-	$(CXX) -std=c++11 -shared -Wl,-z,relro -o rClrMono$(SHLIB_EXT) rClrMono.o $(ALL_LIBS)
+	$(CXX) $(GDEBUG_FLAGS) -std=c++11 -shared -Wl,-z,relro -o rClrMono$(SHLIB_EXT) rClrMono.o $(ALL_LIBS)
 
 printarch:
 	-@echo **Variable information only for diagnosis purposes**

src/rClr.h

@@ -3,6 +3,13 @@
 
 // #define RCLR_VER 0x000100 /* RCLR v0.1-0 */
 
+// 202005 Temporarily to faciliate debugging from VSCode
+#ifndef MONO_CLR
+#ifdef __linux__
+#define MONO_CLR
+#endif 
+#endif 
+
 #ifndef MS_CLR
 #ifndef MONO_CLR
 #define MS_CLR 1