Make it build

libs/core/Makefile

@@ -1,6 +1,6 @@
 include Makefile.inc
 
-COMMON_FLAGS = -W -Wall -Ipxtapp -fwrapv -fno-threadsafe-statics 
+COMMON_FLAGS = -W -Wall -Wno-unused-parameter -Ipxtapp -fwrapv -fno-threadsafe-statics 
 CFLAGS = $(COMMON_FLAGS) -std=c99
 CXXFLAGS = $(COMMON_FLAGS) -std=c++11 -fno-rtti -fno-exceptions -fno-unwind-tables
 LDFLAGS = -Wl,--gc-sections -Wl,--sort-common -Wl,--sort-section=alignment

libs/core/linux.cpp

@@ -0,0 +1,77 @@
+#include "pxt.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/time.h>
+#include <time.h>
+
+namespace pxt {
+
+void sendSerial(const char *data, int len) {
+    fwrite(data, 1, len, stderr);
+}
+
+extern "C" void target_panic(int error_code) {
+    char buf[50];
+    snprintf(buf, sizeof(buf), "\nPANIC %d\n", error_code);
+    sendSerial(buf, strlen(buf));
+    abort();
+}
+
+extern "C" void target_reset() {
+    exit(0);
+}
+
+void sleep_us(uint64_t us) {
+    struct timespec ts;
+    ts.tv_sec = us / 1000000;
+    ts.tv_nsec = (us % 1000000) * 1000;
+    while (nanosleep(&ts, &ts))
+        ;
+}
+
+void sleep_ms(uint32_t ms) {
+    sleep_us((uint64_t)ms * 1000);
+}
+
+uint64_t currTime() {
+    struct timeval tv;
+    gettimeofday(&tv, NULL);
+    return tv.tv_sec * 1000 + tv.tv_usec / 1000;
+}
+
+static int startTime;
+
+void initRuntime() {
+    startTime = currTime();
+}
+
+int current_time_ms() {
+    return currTime() - startTime;
+}
+
+int getSerialNumber() {
+    return 42; // TODO
+}
+
+void registerWithDal(int id, int event, Action a) {
+    // TODO
+}
+void runInBackground(Action a) {
+    // TODO
+}
+void runForever(Action a) {
+    // TODO
+}
+void waitForEvent(int id, int event) {
+    // TODO
+}
+
+uint32_t afterProgramPage() {
+    return 0;
+}
+void dumpDmesg() {
+    // TODO
+}
+
+}

libs/core/pxt.json

@@ -6,6 +6,7 @@
         "Makefile",
         "pxt.h",
         "pxtcore.h",
+        "linux.cpp",
         "ns.ts"
     ],
     "testFiles": [