DSO -> DSO linking works with https://github.com/kripken/emscripten/pull/7512

Makefile

@@ -29,11 +29,7 @@ all	: $(TARGET)/prog.js
 $(TARGET)/libf_so.$(SO)	: libf.c
 	$(CC) -s SIDE_MODULE=1 -DLIBF_COMPILE -o $@ $<
 
-# FIXME RUNTIME_LINKED_LIBS does not work for SIDE_MODULE=1
-#       Currently it is worked around with __attribute__(constructor) in libk.c
-#
-# TODO	teach emscripten/support.js:loadDynamicLibrary() to check loaded
-#       module.dynamicLibraries and further load dependent shared libs automatically.
+# linking libk_so -> libf_so needs https://github.com/kripken/emscripten/pull/7512 to work
 $(TARGET)/libk_so.$(SO)	: libk.c libf.h $(TARGET)/libf_so.$(SO)
 	$(CC) -s SIDE_MODULE=1 -s RUNTIME_LINKED_LIBS="['libf_so.$(SO)']" -DLIBK_COMPILE -o $@ $<
 

js/libf_so.js

@@ -28,6 +28,8 @@
 // Runtime essentials
 //========================================
 
+
+
 // === Body ===
 
 var ASM_CONSTS = [];

js/libk_so.js

@@ -28,6 +28,10 @@
 // Runtime essentials
 //========================================
 
+if (!Module['dynamicLibraries']) Module['dynamicLibraries'] = [];
+Module['dynamicLibraries'] = ["libf_so.js"].concat(Module['dynamicLibraries']);
+
+
 // === Body ===
 
 var ASM_CONSTS = [];

libk.c

@@ -4,21 +4,6 @@
 #include <emscripten.h>
 
 
-#if 0
-// XXX should be in make, but currently emscripten cannot do this
-__attribute__((constructor))
-static void init() {
-	// XXX EM_ASM does not work in wasm mode
-#	if 0
-	EM_ASM({
-	    loadDynamicLibrary('libf_so.js');
-	});
-#else
-	emscripten_run_script("loadDynamicLibrary('libf_so.wasm')");
-#	endif
-}
-#endif
-
 LIBKAPI
 int kfunc1() {
 	ffunc1();