diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 0ff56c5cd..921896034 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -423,6 +423,32 @@ jobs:
           -DANDROID_PLATFORM=24 -DANDROID_ABI=arm64-v8a -DBUILD_SHARED_LIBS=OFF -DWITH_VM=OFF
         cmake --build build
 
+  check-abi:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v6
+      name: Checkout current
+    - uses: actions/checkout@v6
+      name: Checkout 1.15
+      with:
+        path: hashlink_1.15
+        ref: 1.15
+    - run: |
+        sudo apt-get update
+        sudo apt-get install abigail-tools
+      name: Setup abi tools
+    - run: |
+        make DEBUG=1 -j8 libhl.so
+      name: Build current
+    - run: |
+        make -C hashlink_1.15 DEBUG=1 -j8 libhl
+      name: Build 1.15
+    - run: |
+        (cd hashlink_1.15 && abidw --header-file src/hl.h libhl.so > libhl.abi)
+        abidw --header-file src/hl.h libhl.so > libhl.abi
+
+        abidiff hashlink_1.15/libhl.abi libhl.abi --no-added-syms --suppr other/abidiff.suppr
+
   haxe-test-suite:
     needs: build
     strategy:
@@ -527,7 +553,7 @@ jobs:
   publish-latest-release:
   ###########################################################
     runs-on: ubuntu-latest
-    needs: [build, haxe-test-suite]
+    needs: [build, check-abi, haxe-test-suite]
     if: github.ref == 'refs/heads/master'
     concurrency: publish-latest-release # https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#jobsjob_idconcurrency
 
diff --git a/other/abidiff.suppr b/other/abidiff.suppr
new file mode 100644
index 000000000..882dc60a9
--- /dev/null
+++ b/other/abidiff.suppr
@@ -0,0 +1,27 @@
+[suppress_type]
+  type_kind = enum
+  name = hl_type_kind
+  changed_enumerators = HLAST
+
+# pcre2 was accidentally exported by libhl.so
+[suppress_function]
+  symbol_name_regexp = ^_?pcre(2|16)_
+  drop = yes
+
+[suppress_variable]
+  symbol_name_regexp = ^_?pcre(2|16)_
+  drop = yes
+
+# accidentally exported, but never part of hl.h
+[suppress_function]
+  symbol_name_regexp = hl_(cache_init|internal_capture_stack|mlookup_alloc|mlookup_find|mlookup_set_impl)
+  drop = yes
+
+[suppress_function]
+  symbol_name_regexp = gc_get_mark_threads
+  drop = yes
+
+# exported explicitly, but never part of hl.h
+[suppress_variable]
+  symbol_name_regexp = hl_closure_stack_capture
+  drop = yes
diff --git a/src/hl.h b/src/hl.h
index 2da71da81..f5be95ebd 100644
--- a/src/hl.h
+++ b/src/hl.h
@@ -630,7 +630,7 @@ typedef struct {
 } hl_setup_t;
 
 HL_API hl_setup_t hl_setup;
-HL_API void hl_sys_init();
+HL_API void hl_sys_init( void **args, int nargs, void *hlfile );
 
 HL_API double hl_nan( void );
 HL_API bool hl_is_dynamic( hl_type *t );
@@ -1020,6 +1020,15 @@ HL_API hl_track_info hl_track;
 
 #endif
 
+// -------------- COMPAT ------------------------------------
+
+HL_API void hl_setup_longjump( void *j );
+HL_API void hl_setup_exception( void *resolve_symbol, void *capture_stack );
+HL_API void hl_set_debug_mode( bool b );
+HL_API void hl_setup_callbacks(void* sc, void* gw);
+HL_API void hl_setup_callbacks2(void* sc, void* gw, int flags);
+HL_API void hl_setup_reload_check( void *freload, void *param );
+
 C_FUNCTION_END
 
 #endif
diff --git a/src/hlc_main.c b/src/hlc_main.c
index e69a39a83..21cc5948e 100644
--- a/src/hlc_main.c
+++ b/src/hlc_main.c
@@ -160,7 +160,7 @@ int main(int argc, char *argv[]) {
 	hl_setup.get_wrapper = hlc_get_wrapper;
 	hl_setup.sys_args = (pchar**)(argv + 1);
 	hl_setup.sys_nargs = argc - 1;
-	hl_sys_init();
+	hl_sys_init(NULL, 0, NULL);
 	tf.ret = &hlt_void;
 	clt.kind = HFUN;
 	clt.fun = &tf;
diff --git a/src/main.c b/src/main.c
index a25b673cc..8c00041ab 100644
--- a/src/main.c
+++ b/src/main.c
@@ -272,7 +272,7 @@ int main(int argc, pchar *argv[]) {
 	hl_setup.file_path = file;
 	hl_setup.sys_args = (pchar**)argv;
 	hl_setup.sys_nargs = argc;
-	hl_sys_init();
+	hl_sys_init(NULL, 0, NULL);
 	hl_register_thread(&ctx);
 	main_ctx = &ctx;
 	ctx.file = file;
diff --git a/src/std/error.c b/src/std/error.c
index 8849cf2ab..e27100396 100644
--- a/src/std/error.c
+++ b/src/std/error.c
@@ -52,12 +52,27 @@ HL_PRIM uchar *hl_resolve_symbol( void *addr, uchar *out, int *outSize ) {
 	return hl_setup.resolve_symbol(addr, out, outSize);
 }
 
+static void (*throw_jump)( jmp_buf, int ) = NULL;
+
+HL_PRIM void hl_setup_longjump( void *j ) {
+	throw_jump = j;
+}
+
+HL_PRIM void hl_setup_exception( void *resolve_symbol, void *capture_stack ) {
+	hl_setup.resolve_symbol = resolve_symbol;
+	hl_setup.capture_stack = capture_stack;
+}
+
 HL_PRIM void hl_set_error_handler( vclosure *d ) {
 	hl_thread_info *t = hl_get_thread();
 	t->trap_uncaught = t->trap_current;
 	t->exc_handler = d;
 }
 
+HL_PRIM void hl_set_debug_mode( bool b ) {
+	hl_setup.is_debugger_enabled = b;
+}
+
 static bool break_on_trap( hl_thread_info *t, hl_trap_ctx *trap, vdynamic *v ) {
 	bool unwrapped = false;
 	vdynamic *vvalue = NULL;
diff --git a/src/std/fun.c b/src/std/fun.c
index fafa8177e..4ec5ad22e 100644
--- a/src/std/fun.c
+++ b/src/std/fun.c
@@ -113,6 +113,20 @@ HL_PRIM bool hl_fun_compare( vdynamic *a, vdynamic *b ) {
 
 // ------------ DYNAMIC CALLS
 
+typedef void *(*fptr_static_call)(void *fun, hl_type *t, void **args, vdynamic *out);
+typedef void *(*fptr_get_wrapper)(hl_type *t);
+
+HL_PRIM void hl_setup_callbacks2( void *c, void *w, int flags ) {
+	hl_setup.static_call = (fptr_static_call)c;
+	hl_setup.get_wrapper = (fptr_get_wrapper)w;
+	hl_setup.static_call_ref = flags & 1;
+}
+
+HL_PRIM void hl_setup_callbacks( void *c, void *w ) {
+	hl_setup.static_call = (fptr_static_call)c;
+	hl_setup.get_wrapper = (fptr_get_wrapper)w;
+}
+
 #define HL_MAX_ARGS 9
 
 HL_PRIM vdynamic* hl_call_method( vdynamic *c, varray *args ) {
diff --git a/src/std/sys.c b/src/std/sys.c
index 7cfeb0d7d..e8217e91b 100644
--- a/src/std/sys.c
+++ b/src/std/sys.c
@@ -159,6 +159,11 @@ HL_PRIM void hl_sys_print( vbyte *msg ) {
 	hl_blocking(false);
 }
 
+HL_PRIM void hl_setup_profiler( void *profile_event, void *before_exit ) {
+	hl_setup.before_exit = before_exit;
+	hl_setup.profile_event = profile_event;
+}
+
 HL_PRIM void hl_sys_profile_event( int code, vbyte *data, int dataLen ) {
 	if( hl_setup.profile_event ) hl_setup.profile_event(code, data, dataLen);
 }
@@ -168,6 +173,18 @@ HL_PRIM void hl_sys_exit( int code ) {
 	exit(code);
 }
 
+static void *f_vtune_init = NULL;
+static void *g_vtune_module = NULL;
+static void setup_vtune_wrapper() {
+	((void(*)(void*))f_vtune_init)(g_vtune_module);
+}
+
+HL_PRIM void hl_setup_vtune( void *vtune_init, void *m ) {
+	f_vtune_init = vtune_init;
+	g_vtune_module = m;
+	hl_setup.vtune_init = setup_vtune_wrapper;
+}
+
 HL_PRIM void hl_sys_vtune_init() {
 	if( hl_setup.vtune_init ) hl_setup.vtune_init();
 }
@@ -674,10 +691,16 @@ HL_PRIM varray *hl_sys_args() {
 	return a;
 }
 
-HL_PRIM void hl_sys_init() {
+HL_PRIM void hl_sys_init(void **args, int nargs, void *hlfile) {
 #ifdef HL_WIN
 	QueryPerformanceFrequency(&qpcFrequency);
 #endif
+	if (hlfile)
+		hl_setup.file_path = (pchar*)hlfile;
+	if (args)
+		hl_setup.sys_args = (pchar**)args;
+	if (nargs)
+		hl_setup.sys_nargs = nargs;
 #	ifdef HL_WIN_DESKTOP
 	setlocale(LC_CTYPE, ""); // printf to current locale
 #	endif
@@ -687,6 +710,18 @@ HL_PRIM vbyte *hl_sys_hl_file() {
 	return (vbyte*)hl_setup.file_path;
 }
 
+static void *compat_reload_fun = NULL;
+static void *compat_reload_param = NULL;
+static bool reload_wrapper() {
+	return ((bool(*)(void*))compat_reload_fun)(compat_reload_param);
+}
+
+HL_PRIM void hl_setup_reload_check( void *freload, void *param ) {
+	compat_reload_fun = freload;
+	compat_reload_param = param;
+	hl_setup.reload_check = reload_wrapper;
+}
+
 HL_PRIM bool hl_sys_check_reload( vbyte *debug_alt_file ) {
 	return hl_setup.reload_check != NULL && hl_setup.reload_check(debug_alt_file);
 }
@@ -696,7 +731,7 @@ HL_PRIM bool hl_sys_has_debugger() {
 }
 
 #ifndef HL_MOBILE
-const char *hl_sys_special( const char *key ) {
+HL_PRIM const char *hl_sys_special( const char *key ) {
 	 hl_error("Unknown sys_special key");
 	 return NULL;
 }
diff --git a/src/std/sys_android.c b/src/std/sys_android.c
index df9519539..469685793 100644
--- a/src/std/sys_android.c
+++ b/src/std/sys_android.c
@@ -227,7 +227,7 @@ static const char* hl_sys_android_get_internal_storage_path(void)
 	return hl_android_internal_files_path;
 }
 
-const char *hl_sys_special( const char *key ) {
+HL_PRIM const char *hl_sys_special( const char *key ) {
 	if (strcmp(key, "android_external_storage_path")==0)
 		return hl_sys_android_get_external_storage_path();
 	else if (strcmp(key, "android_internal_storage_path")==0)
@@ -239,4 +239,4 @@ const char *hl_sys_special( const char *key ) {
 
 DEFINE_PRIM(_BYTES, sys_special, _BYTES);
 
-#endif
\ No newline at end of file
+#endif
diff --git a/src/std/sys_ios.m b/src/std/sys_ios.m
index 602d0453e..7cae88686 100644
--- a/src/std/sys_ios.m
+++ b/src/std/sys_ios.m
@@ -54,7 +54,7 @@ static int ios_get_retina_scale_factor()
 	return [[UIScreen mainScreen] scale];
 }
 
-const char *hl_sys_special( const char *key ) {
+HL_PRIM const char *hl_sys_special( const char *key ) {
 	if (strcmp(key, "ios_resource_path")==0)
 		return ios_get_resource_path();
 	else if (strcmp(key, "ios_document_path")==0)