(build)

wasm@deco:~/trydynlib$ make

emcc -s WASM=0 -s SIDE_MODULE=1 -DLIBK_COMPILE -o libk_so.js libk.c
emcc -s WASM=0 -s MAIN_MODULE=1 -o prog.js prog.c
warning: unexpected number of arguments 0 in call to 'kfunc1', should be 1

wasm@deco:~/trydynlib$ node prog.js
prog!
external function 'kfunc1' is missing. perhaps a side module was not linked in? if this function was expected to arrive from a system library, try to build the MAIN_MODULE with EMCC_FORCE_STDLIBS=1 in the environment
external function 'kfunc1' is missing. perhaps a side module was not linked in? if this function was expected to arrive from a system library, try to build the MAIN_MODULE with EMCC_FORCE_STDLIBS=1 in the environment
exception thrown: abort("external function 'kfunc1' is missing. perhaps a side module was not linked in? if this function was expected to arrive from a system library, try to build the MAIN_MODULE with EMCC_FORCE_STDLIBS=1 in the environment") at Error
    at jsStackTrace (/home/wasm/trydynlib/prog.js:1135:13)
    at stackTrace (/home/wasm/trydynlib/prog.js:1152:12)
    at abort (/home/wasm/trydynlib/prog.js:106460:44)
    at _kfunc1 (/home/wasm/trydynlib/prog.js:7562:27)
    at _main (/home/wasm/trydynlib/prog.js:30419:8)
    at Object.asm._main (/home/wasm/trydynlib/prog.js:105713:21)
    at Object.callMain (/home/wasm/trydynlib/prog.js:106290:30)
    at doRun (/home/wasm/trydynlib/prog.js:106348:60)
    at run (/home/wasm/trydynlib/prog.js:106362:5)
    at Object.<anonymous> (/home/wasm/trydynlib/prog.js:106485:1)

libk_so.js

+// Copyright 2011 The Emscripten Authors.  All rights reserved.
+// Emscripten is available under two separate licenses, the MIT license and the
+// University of Illinois/NCSA Open Source License.  Both these licenses can be
+// found in the LICENSE file.
+
+// Capture the output of this into a variable, if you want
+(function(fb, parentModule) {
+  var Module = {};
+  var args = [];
+  Module.arguments = [];
+  Module.cleanups = [];
+
+  var gb = 0;
+  // Each module has its own stack
+  var STACKTOP = getMemory(TOTAL_STACK);
+  assert(STACKTOP % 8 == 0);
+  var STACK_MAX = STACKTOP + TOTAL_STACK;
+  Module.cleanups.push(function() {
+    parentModule['_free'](STACKTOP); // XXX ensure exported, and that it was actually malloc'ed and not static memory FIXME
+    parentModule['_free'](gb);
+  });
+
+  
+
+// === Auto-generated preamble library stuff ===
+
+//========================================
+// Runtime essentials
+//========================================
+
+// === Body ===
+
+var ASM_CONSTS = [];
+
+
+
+
+
+
+gb = alignMemory(getMemory(0 + 4), 4 || 1);
+
+for (var i = gb; i < gb + 0; ++i) HEAP8[i] = 0;
+
+// STATICTOP = STATIC_BASE + 0;
+/* global initializers */  __ATINIT__.push();
+
+
+/* memory initializer */ allocate([], "i8", ALLOC_NONE, gb);
+
+
+
+
+
+/* no memory initializer */
+// {{PRE_LIBRARY}}
+
+var ASSERTIONS = true;
+
+// Copyright 2017 The Emscripten Authors.  All rights reserved.
+// Emscripten is available under two separate licenses, the MIT license and the
+// University of Illinois/NCSA Open Source License.  Both these licenses can be
+// found in the LICENSE file.
+
+/** @type {function(string, boolean=, number=)} */
+function intArrayFromString(stringy, dontAddNull, length) {
+  var len = length > 0 ? length : lengthBytesUTF8(stringy)+1;
+  var u8array = new Array(len);
+  var numBytesWritten = stringToUTF8Array(stringy, u8array, 0, u8array.length);
+  if (dontAddNull) u8array.length = numBytesWritten;
+  return u8array;
+}
+
+function intArrayToString(array) {
+  var ret = [];
+  for (var i = 0; i < array.length; i++) {
+    var chr = array[i];
+    if (chr > 0xFF) {
+      if (ASSERTIONS) {
+        assert(false, 'Character code ' + chr + ' (' + String.fromCharCode(chr) + ')  at offset ' + i + ' not in 0x00-0xFF.');
+      }
+      chr &= 0xFF;
+    }
+    ret.push(String.fromCharCode(chr));
+  }
+  return ret.join('');
+}
+
+
+
+
+
+Module.asmGlobalArg = { "Math": Math, "Int8Array": Int8Array, "Int16Array": Int16Array, "Int32Array": Int32Array, "Uint8Array": Uint8Array, "Uint16Array": Uint16Array, "Uint32Array": Uint32Array, "Float32Array": Float32Array, "Float64Array": Float64Array, "NaN": NaN, "Infinity": Infinity };
+
+Module.asmLibraryArg = { "abort": abort, "assert": assert, "enlargeMemory": enlargeMemory, "getTotalMemory": getTotalMemory, "abortOnCannotGrowMemory": abortOnCannotGrowMemory, "abortStackOverflow": abortStackOverflow, "setTempRet0": setTempRet0, "getTempRet0": getTempRet0, "DYNAMICTOP_PTR": DYNAMICTOP_PTR, "tempDoublePtr": tempDoublePtr, "STACKTOP": STACKTOP, "STACK_MAX": STACK_MAX, "gb": gb, "fb": fb };
+// EMSCRIPTEN_START_ASM
+var asm = (/** @suppress {uselessCode} */ function(global, env, buffer) {
+'almost asm';
+
+
+  var HEAP8 = new global.Int8Array(buffer);
+  var HEAP16 = new global.Int16Array(buffer);
+  var HEAP32 = new global.Int32Array(buffer);
+  var HEAPU8 = new global.Uint8Array(buffer);
+  var HEAPU16 = new global.Uint16Array(buffer);
+  var HEAPU32 = new global.Uint32Array(buffer);
+  var HEAPF32 = new global.Float32Array(buffer);
+  var HEAPF64 = new global.Float64Array(buffer);
+
+  var DYNAMICTOP_PTR=env.DYNAMICTOP_PTR|0;
+  var tempDoublePtr=env.tempDoublePtr|0;
+  var STACKTOP=env.STACKTOP|0;
+  var STACK_MAX=env.STACK_MAX|0;
+  var gb=env.gb|0;
+  var fb=env.fb|0;
+
+  var __THREW__ = 0;
+  var threwValue = 0;
+  var setjmpId = 0;
+  var undef = 0;
+  var nan = global.NaN, inf = global.Infinity;
+  var tempInt = 0, tempBigInt = 0, tempBigIntS = 0, tempValue = 0, tempDouble = 0.0;
+
+  var Math_floor=global.Math.floor;
+  var Math_abs=global.Math.abs;
+  var Math_sqrt=global.Math.sqrt;
+  var Math_pow=global.Math.pow;
+  var Math_cos=global.Math.cos;
+  var Math_sin=global.Math.sin;
+  var Math_tan=global.Math.tan;
+  var Math_acos=global.Math.acos;
+  var Math_asin=global.Math.asin;
+  var Math_atan=global.Math.atan;
+  var Math_atan2=global.Math.atan2;
+  var Math_exp=global.Math.exp;
+  var Math_log=global.Math.log;
+  var Math_ceil=global.Math.ceil;
+  var Math_imul=global.Math.imul;
+  var Math_min=global.Math.min;
+  var Math_max=global.Math.max;
+  var Math_clz32=global.Math.clz32;
+  var abort=env.abort;
+  var assert=env.assert;
+  var enlargeMemory=env.enlargeMemory;
+  var getTotalMemory=env.getTotalMemory;
+  var abortOnCannotGrowMemory=env.abortOnCannotGrowMemory;
+  var abortStackOverflow=env.abortStackOverflow;
+  var setTempRet0=env.setTempRet0;
+  var getTempRet0=env.getTempRet0;
+  var tempFloat = 0.0;
+
+// EMSCRIPTEN_START_FUNCS
+
+function stackAlloc(size) {
+  size = size|0;
+  var ret = 0;
+  ret = STACKTOP;
+  STACKTOP = (STACKTOP + size)|0;
+  STACKTOP = (STACKTOP + 15)&-16;
+    if ((STACKTOP|0) >= (STACK_MAX|0)) abortStackOverflow(size|0);
+
+  return ret|0;
+}
+function stackSave() {
+  return STACKTOP|0;
+}
+function stackRestore(top) {
+  top = top|0;
+  STACKTOP = top;
+}
+function establishStackSpace(stackBase, stackMax) {
+  stackBase = stackBase|0;
+  stackMax = stackMax|0;
+  STACKTOP = stackBase;
+  STACK_MAX = stackMax;
+}
+function setThrew(threw, value) {
+  threw = threw|0;
+  value = value|0;
+  if ((__THREW__|0) == 0) {
+    __THREW__ = threw;
+    threwValue = value;
+  }
+}
+
+function _kfunc1() {
+ var label = 0, sp = 0;
+ sp = STACKTOP;
+ return 12;
+}
+function runPostSets() {
+ var temp = 0;
+}
+
+  
+
+
+// EMSCRIPTEN_END_FUNCS
+
+
+  return { establishStackSpace: establishStackSpace, runPostSets: runPostSets, setThrew: setThrew, stackAlloc: stackAlloc, stackRestore: stackRestore, stackSave: stackSave };
+})
+// EMSCRIPTEN_END_ASM
+(Module.asmGlobalArg, Module.asmLibraryArg, buffer);
+
+var real_setThrew = asm["setThrew"]; asm["setThrew"] = function() {
+  assert(runtimeInitialized, 'you need to wait for the runtime to be ready (e.g. wait for main() to be called)');
+  assert(!runtimeExited, 'the runtime was exited (use NO_EXIT_RUNTIME to keep it alive after main() exits)');
+  return real_setThrew.apply(null, arguments);
+};
+var runPostSets = Module["runPostSets"] = asm["runPostSets"];
+var setThrew = Module["setThrew"] = asm["setThrew"];
+
+
+
+
+
+var NAMED_GLOBALS = {  };
+for (var named in NAMED_GLOBALS) {
+  Module['_' + named] = gb + NAMED_GLOBALS[named];
+}
+Module['NAMED_GLOBALS'] = NAMED_GLOBALS;
+;
+
+parentModule['registerFunctions']([], Module);
+
+
+
+// === Auto-generated postamble setup entry stuff ===
+
+
+
+
+__ATPRERUN__.push(runPostSets);
+
+if (runtimeInitialized) {
+  // dlopen case: we are being loaded after the system is fully initialized, so just run our prerun and atinit stuff now
+  callRuntimeCallbacks(__ATPRERUN__);
+  callRuntimeCallbacks(__ATINIT__);
+} // otherwise, general dynamic linking case: stuff we added to prerun and init will be executed with the rest of the system as it loads
+
+
+
+
+
+  // {{MODULE_ADDITIONS}}
+
+  return Module;
+});
+
+
+
+