From 3d4a7e273b67974dc923bf45be075ac899615535 Mon Sep 17 00:00:00 2001
From: dybucc <149513579+dybucc@users.noreply.github.com>
Date: Thu, 4 Jun 2026 10:35:02 +0200
Subject: [PATCH] emscripten: deprecate file offset types

emscripten follows musl quite closely. The changes they make are not
concerned with file offset types. The only exception to this is
`blkcnt_t`. This type is defined as 32-bits wide no matter the target.

All other file offset types are 64-bit wide no matter the target.
---
 libc-test/semver/emscripten.txt       |  1 -
 src/unix/linux_like/emscripten/mod.rs | 56 +++++++++++++++++++++------
 src/unix/linux_like/mod.rs            |  1 +
 3 files changed, 46 insertions(+), 12 deletions(-)

diff --git a/libc-test/semver/emscripten.txt b/libc-test/semver/emscripten.txt
index dc9e6b4f3b52d..48559aa89bdc3 100644
--- a/libc-test/semver/emscripten.txt
+++ b/libc-test/semver/emscripten.txt
@@ -6,4 +6,3 @@ getgrnam
 getgrnam_r
 getpwnam_r
 getpwuid_r
-posix_fallocate64
diff --git a/src/unix/linux_like/emscripten/mod.rs b/src/unix/linux_like/emscripten/mod.rs
index 128025d813789..076c2da2f6a61 100644
--- a/src/unix/linux_like/emscripten/mod.rs
+++ b/src/unix/linux_like/emscripten/mod.rs
@@ -28,19 +28,40 @@ pub type fsfilcnt_t = u32;
 pub type rlim_t = u64;
 pub type nlink_t = u32;
 
-pub type ino64_t = crate::ino_t;
-pub type off64_t = off_t;
-pub type blkcnt64_t = crate::blkcnt_t;
-pub type rlim64_t = crate::rlim_t;
-
-pub type rlimit64 = crate::rlimit;
-pub type flock64 = crate::flock;
-pub type stat64 = crate::stat;
-pub type statfs64 = crate::statfs;
-pub type statvfs64 = crate::statvfs;
-pub type dirent64 = crate::dirent;
+macro_rules! deprecate_lfs64 {
+    ($($it:item)+) => {
+        $(
+            #[deprecated(
+                since = "0.2.187",
+                note = "Use the unsuffixed variant instead. emscripten uses musl, and makes no \
+                        changes to these types. musl exposes 64-bit types no matter the target \
+                        triple.",
+            )]
+            $it
+        )+
+    };
+}
+
+deprecate_lfs64! {
+    pub type ino64_t = ino_t;
+    pub type off64_t = off_t;
+    pub type blkcnt64_t = crate::blkcnt_t;
+    pub type rlim64_t = crate::rlim_t;
+
+    pub type rlimit64 = crate::rlimit;
+    pub type flock64 = crate::flock;
+    pub type stat64 = crate::stat;
+    pub type statfs64 = crate::statfs;
+    pub type statvfs64 = crate::statvfs;
+    pub type dirent64 = crate::dirent;
+}
 
 extern_ty! {
+    #[deprecated(
+        since = "0.2.187",
+        note = "Use the unsuffixed variant instead. emscripten uses musl, and makes no changes to \
+                these types. musl exposes 64-bit types no mater the target triple."
+    )]
     pub enum fpos64_t {} // FIXME(emscripten): fill this out with a struct
 }
 
@@ -1456,5 +1477,18 @@ extern "C" {
 }
 
 // Alias <foo> to <foo>64 to mimic glibc's LFS64 support
+#[deprecated(
+    since = "0.2.187",
+    note = "Use the unsuffixed variant instead. emscripten uses musl, and makes no changes to \
+            these routines. musl exposes 64-bit types no matter the target triple."
+)]
+#[allow(deprecated)]
 mod lfs64;
+
+#[deprecated(
+    since = "0.2.187",
+    note = "Use the unsuffixed variant instead. emscripten uses musl, and makes no changes to \
+            these routines. musl exposes 64-bit types no matter the target triple."
+)]
+#[allow(deprecated)]
 pub use self::lfs64::*;
diff --git a/src/unix/linux_like/mod.rs b/src/unix/linux_like/mod.rs
index e594abb9693b8..6b2f61af3417e 100644
--- a/src/unix/linux_like/mod.rs
+++ b/src/unix/linux_like/mod.rs
@@ -533,6 +533,7 @@ cfg_if! {
     if #[cfg(target_os = "android")] {
         pub const RLIM64_INFINITY: c_ulonglong = !0;
     } else {
+        #[cfg_attr(target_os = "emscripten", allow(deprecated))]
         pub const RLIM64_INFINITY: crate::rlim64_t = !0;
     }
 }