From 6ce7e79948ee4bade00ce0f0a7810295c0a7f4d9 Mon Sep 17 00:00:00 2001
From: Mads Marquart <mads@marquart.dk>
Date: Thu, 10 Oct 2024 20:45:39 +0200
Subject: [PATCH] Don't try to use confstr in Miri

---
 std/src/sys/pal/unix/os.rs       | 8 +++++---
 std/src/sys/pal/unix/os/tests.rs | 2 +-
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/std/src/sys/pal/unix/os.rs b/std/src/sys/pal/unix/os.rs
index d26a1bdef74b4..f207131ddf332 100644
--- a/std/src/sys/pal/unix/os.rs
+++ b/std/src/sys/pal/unix/os.rs
@@ -704,7 +704,9 @@ pub fn page_size() -> usize {
 //
 // [posix_confstr]:
 //     https://pubs.opengroup.org/onlinepubs/9699919799/functions/confstr.html
-#[cfg(target_vendor = "apple")]
+//
+// FIXME: Support `confstr` in Miri.
+#[cfg(all(target_vendor = "apple", not(miri)))]
 fn confstr(key: c_int, size_hint: Option<usize>) -> io::Result<OsString> {
     let mut buf: Vec<u8> = Vec::with_capacity(0);
     let mut bytes_needed_including_nul = size_hint
@@ -753,7 +755,7 @@ fn confstr(key: c_int, size_hint: Option<usize>) -> io::Result<OsString> {
     Ok(OsString::from_vec(buf))
 }
 
-#[cfg(target_vendor = "apple")]
+#[cfg(all(target_vendor = "apple", not(miri)))]
 fn darwin_temp_dir() -> PathBuf {
     confstr(libc::_CS_DARWIN_USER_TEMP_DIR, Some(64)).map(PathBuf::from).unwrap_or_else(|_| {
         // It failed for whatever reason (there are several possible reasons),
@@ -765,7 +767,7 @@ fn darwin_temp_dir() -> PathBuf {
 pub fn temp_dir() -> PathBuf {
     crate::env::var_os("TMPDIR").map(PathBuf::from).unwrap_or_else(|| {
         cfg_if::cfg_if! {
-            if #[cfg(target_vendor = "apple")] {
+            if #[cfg(all(target_vendor = "apple", not(miri)))] {
                 darwin_temp_dir()
             } else if #[cfg(target_os = "android")] {
                 PathBuf::from("/data/local/tmp")
diff --git a/std/src/sys/pal/unix/os/tests.rs b/std/src/sys/pal/unix/os/tests.rs
index a84086037ce0b..63a1cc1e94a1d 100644
--- a/std/src/sys/pal/unix/os/tests.rs
+++ b/std/src/sys/pal/unix/os/tests.rs
@@ -25,7 +25,7 @@ fn test_parse_glibc_version() {
 // Smoke check `confstr`, do it for several hint values, to ensure our resizing
 // logic is correct.
 #[test]
-#[cfg(target_vendor = "apple")]
+#[cfg(all(target_vendor = "apple", not(miri)))]
 fn test_confstr() {
     for key in [libc::_CS_DARWIN_USER_TEMP_DIR, libc::_CS_PATH] {
         let value_nohint = super::confstr(key, None).unwrap_or_else(|e| {