From b59cdc0858a18e6ac9b690bee5ffc712af70ba07 Mon Sep 17 00:00:00 2001
From: valadaptive <valadaptive@protonmail.com>
Date: Thu, 4 Jun 2026 08:39:20 -0400
Subject: [PATCH 1/2] Move the fadvise64 stub into C

---
 src/lib/libsigs.js                                |  1 -
 src/lib/libsyscall.js                             |  3 ---
 system/lib/libc/emscripten_syscall_stubs.c        |  5 +++++
 test/codesize/test_codesize_hello_dylink_all.json | 11 +++++------
 4 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/src/lib/libsigs.js b/src/lib/libsigs.js
index bd55356fb7a35..e33cca1218f5e 100644
--- a/src/lib/libsigs.js
+++ b/src/lib/libsigs.js
@@ -238,7 +238,6 @@ sigs = {
   __syscall_dup__sig: 'ii',
   __syscall_dup3__sig: 'iiii',
   __syscall_faccessat__sig: 'iipii',
-  __syscall_fadvise64__sig: 'iijji',
   __syscall_fallocate__sig: 'iiijj',
   __syscall_fchdir__sig: 'ii',
   __syscall_fchmod__sig: 'iii',
diff --git a/src/lib/libsyscall.js b/src/lib/libsyscall.js
index ed39f4f64d14c..a0105e2a2871f 100644
--- a/src/lib/libsyscall.js
+++ b/src/lib/libsyscall.js
@@ -832,9 +832,6 @@ var SyscallsLibrary = {
     SYSCALLS.writeStatFs(buf, FS.statfsStream(stream));
     return 0;
   },
-  __syscall_fadvise64__nothrow: true,
-  __syscall_fadvise64__proxy: 'none',
-  __syscall_fadvise64: (fd, offset, len, advice) => 0,
   __syscall_openat__deps: ['$syscallGetVarargI'],
   __syscall_openat: (dirfd, path, flags, varargs) => {
     path = SYSCALLS.getStr(path);
diff --git a/system/lib/libc/emscripten_syscall_stubs.c b/system/lib/libc/emscripten_syscall_stubs.c
index 809027da5a03a..13ec599a8ee45 100644
--- a/system/lib/libc/emscripten_syscall_stubs.c
+++ b/system/lib/libc/emscripten_syscall_stubs.c
@@ -186,6 +186,11 @@ weak int __syscall_madvise(intptr_t addr, size_t length, int advice) {
   return 0;
 }
 
+weak int __syscall_fadvise64(int fd, off_t offset, off_t length, int advice) {
+  // this is purely advisory, so we don't warn
+  return 0;
+}
+
 weak int __syscall_mlock(intptr_t addr, size_t len) {
   REPORT(mlock);
   return 0;
diff --git a/test/codesize/test_codesize_hello_dylink_all.json b/test/codesize/test_codesize_hello_dylink_all.json
index c7ef6b6852523..5bdd8786206e7 100644
--- a/test/codesize/test_codesize_hello_dylink_all.json
+++ b/test/codesize/test_codesize_hello_dylink_all.json
@@ -1,7 +1,7 @@
 {
-  "a.out.js": 268175,
-  "a.out.nodebug.wasm": 587614,
-  "total": 855789,
+  "a.out.js": 268126,
+  "a.out.nodebug.wasm": 587596,
+  "total": 855722,
   "sent": [
     "IMG_Init",
     "IMG_Load",
@@ -223,7 +223,6 @@
     "__syscall_dup",
     "__syscall_dup3",
     "__syscall_faccessat",
-    "__syscall_fadvise64",
     "__syscall_fallocate",
     "__syscall_fchdir",
     "__syscall_fchmod",
@@ -1742,7 +1741,6 @@
     "env.__syscall_dup",
     "env.__syscall_dup3",
     "env.__syscall_faccessat",
-    "env.__syscall_fadvise64",
     "env.__syscall_fallocate",
     "env.__syscall_fchdir",
     "env.__syscall_fchmod",
@@ -2194,6 +2192,7 @@
     "__subvti3",
     "__synccall",
     "__syscall_acct",
+    "__syscall_fadvise64",
     "__syscall_getegid32",
     "__syscall_geteuid32",
     "__syscall_getgid32",
@@ -4075,6 +4074,7 @@
     "$__subvti3",
     "$__synccall",
     "$__syscall_acct",
+    "$__syscall_fadvise64",
     "$__syscall_getgroups32",
     "$__syscall_getpid",
     "$__syscall_getppid",
@@ -4906,7 +4906,6 @@
     "$pop_arg_long_double",
     "$popen",
     "$posix_close",
-    "$posix_fadvise",
     "$posix_fallocate",
     "$posix_getdents",
     "$posix_openpt",

From ee653261f8e498386b611bc8f6be8aee668c2f9a Mon Sep 17 00:00:00 2001
From: valadaptive <valadaptive@protonmail.com>
Date: Thu, 4 Jun 2026 08:39:33 -0400
Subject: [PATCH 2/2] Remove dead _emscripten_default_pthread_stack_size

---
 system/lib/pthread/threading_internal.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/system/lib/pthread/threading_internal.h b/system/lib/pthread/threading_internal.h
index a19b6ad564bc5..097595e3ba6b9 100644
--- a/system/lib/pthread/threading_internal.h
+++ b/system/lib/pthread/threading_internal.h
@@ -110,7 +110,6 @@ void emscripten_conditional_set_current_thread_status(EM_THREAD_STATUS expectedS
 
 int __pthread_kill_js(pthread_t t, int sig);
 int __pthread_create_js(pthread_t thread, const pthread_attr_t *attr, void *(*start_routine) (void *), void *arg);
-int _emscripten_default_pthread_stack_size();
 void __set_thread_state(pthread_t ptr, int is_main, int is_runtime, int can_block);
 
 double _emscripten_receive_on_main_thread_js(int funcIndex, void* emAsmAddr, pthread_t callingThread, int numCallArgs, double* args, void* ctx, void* ctxArgs);