[libc++] Avoids using ENODATA.

[mordante]

This macro is deprecated in C++26.

Fixes #81360

[llvmbot]

@llvm/pr-subscribers-libcxx

Author: Mark de Wever (mordante)

Changes

This macro is deprecated in C++26.

Fixes #81360

---

Full diff: https://github.com/llvm/llvm-project/pull/86165.diff

2 Files Affected:

• (modified) libcxx/docs/ReleaseNotes/19.rst (+4-1)
• (modified) libcxx/src/random.cpp (+1-3)

diff --git a/libcxx/docs/ReleaseNotes/19.rst b/libcxx/docs/ReleaseNotes/19.rst
index cac42f9c3c3f79..70cf3812d771aa 100644
--- a/libcxx/docs/ReleaseNotes/19.rst
+++ b/libcxx/docs/ReleaseNotes/19.rst
@@ -100,7 +100,10 @@ TODO
 
 ABI Affecting Changes
 ---------------------
-TODO
+
+- The optional POSIX macro ``ENODATA`` has been deprecated in C++. The
+  ``random_device`` could throw a ``system_error`` with this value. It now
+  throws ``ENOMSG``.
 
 
 Build System Changes
diff --git a/libcxx/src/random.cpp b/libcxx/src/random.cpp
index 93590af310e51a..14c6f4473d70b9 100644
--- a/libcxx/src/random.cpp
+++ b/libcxx/src/random.cpp
@@ -79,10 +79,8 @@ unsigned random_device::operator()() {
   char* p  = reinterpret_cast<char*>(&r);
   while (n > 0) {
     ssize_t s = read(__f_, p, n);
-    _LIBCPP_SUPPRESS_DEPRECATED_PUSH
     if (s == 0)
-      __throw_system_error(ENODATA, "random_device got EOF"); // TODO ENODATA -> ENOMSG
-    _LIBCPP_SUPPRESS_DEPRECATED_POP
+      __throw_system_error(ENOMSG, "random_device got EOF");
     if (s == -1) {
       if (errno != EINTR)
         __throw_system_error(errno, "random_device got an unexpected error");