[0.2] Backport two FreeBSD-related pull requests

build.rs

@@ -65,14 +65,21 @@ fn main() {
     //
     // On CI, we detect the actual FreeBSD version and match its ABI exactly,
     // running tests to ensure that the ABI is correct.
-    match which_freebsd() {
-        Some(10) if libc_ci => set_cfg("freebsd10"),
-        Some(11) if libc_ci => set_cfg("freebsd11"),
-        Some(12) if libc_ci || rustc_dep_of_std => set_cfg("freebsd12"),
-        Some(13) if libc_ci => set_cfg("freebsd13"),
-        Some(14) if libc_ci => set_cfg("freebsd14"),
-        Some(15) if libc_ci => set_cfg("freebsd15"),
-        Some(_) | None => set_cfg("freebsd11"),
+    let which_freebsd = if libc_ci {
+        which_freebsd().unwrap_or(11)
+    } else if rustc_dep_of_std {
+        12
+    } else {
+        11
+    };
+    match which_freebsd {
+        x if x < 10 => panic!("FreeBSD older than 10 is not supported"),
+        10 => set_cfg("freebsd10"),
+        11 => set_cfg("freebsd11"),
+        12 => set_cfg("freebsd12"),
+        13 => set_cfg("freebsd13"),
+        14 => set_cfg("freebsd14"),
+        _ => set_cfg("freebsd15"),
     }
 
     match emcc_version_code() {

libc-test/build.rs

@@ -2575,6 +2575,7 @@ fn test_freebsd(target: &str) {
         // skip those that are manually verified
         match name {
             // FIXME: https://github.com/rust-lang/libc/issues/1272
+            // Also, `execvpe` is introduced in FreeBSD 14.1
             "execv" | "execve" | "execvp" | "execvpe" | "fexecve" => true,
 
             // The `uname` function in the `utsname.h` FreeBSD header is a C

libc-test/semver/freebsd.txt

@@ -1870,6 +1870,7 @@ eui64_hostton
 eui64_ntoa
 eui64_ntohost
 exect
+execvpe
 execvP
 explicit_bzero
 extattr_delete_fd

src/unix/bsd/freebsdlike/freebsd/mod.rs

@@ -5648,6 +5648,12 @@ extern "C" {
     ) -> ::c_int;
     pub fn closefrom(lowfd: ::c_int);
     pub fn close_range(lowfd: ::c_uint, highfd: ::c_uint, flags: ::c_int) -> ::c_int;
+
+    pub fn execvpe(
+        file: *const ::c_char,
+        argv: *const *const ::c_char,
+        envp: *const *const ::c_char,
+    ) -> ::c_int;
 }
 
 #[link(name = "memstat")]