lang/rust: add patches so that RUST_BACKTRACE works.

Add NetBSD to the systems which need dl_iterate_phdr(),
and make NetBSD find the debug libraries if present.
Also make the execinfo functions visible, but not sure
that's used by rust.

Back-ported from wip / 1.60.0, but we can't do != in
conditionals here.


(he)

$NetBSD: patch-library_backtrace_src_symbolize_gimli.rs,v 1.1 2022/05/18 20:57:28 he Exp $

Do mmap also on NetBSD, and also do dl_iterate_phdr.

--- library/backtrace/src/symbolize/gimli.rs.orig	2022-02-23 04:07:36.000000000 +0000
+++ library/backtrace/src/symbolize/gimli.rs
@@ -38,6 +38,7 @@ cfg_if::cfg_if! {
         target_os = "ios",
         target_os = "linux",
         target_os = "macos",
+        target_os = "netbsd",
         target_os = "openbsd",
         target_os = "solaris",
         target_os = "illumos",
@@ -177,6 +178,7 @@ cfg_if::cfg_if! {
             target_os = "linux",
             target_os = "fuchsia",
             target_os = "freebsd",
+            target_os = "netbsd",
             target_os = "openbsd",
             all(target_os = "android", feature = "dl_iterate_phdr"),
         ),

$NetBSD: patch-library_backtrace_src_symbolize_gimli_elf.rs,v 1.1 2022/05/18 20:57:28 he Exp $

Make NetBSD also find its debug libraries, if present.

--- library/backtrace/src/symbolize/gimli/elf.rs.orig	2022-02-23 04:07:36.000000000 +0000
+++ library/backtrace/src/symbolize/gimli/elf.rs
@@ -276,11 +276,16 @@ fn decompress_zlib(input: &[u8], output:
     }
 }
 
+#[cfg(target_os = "netbsd")]
+const DEBUG_PATH: &[u8] = b"/usr/libdata/debug";
+#[cfg(any(target_os = "freebsd", target_os = "linux"))]
 const DEBUG_PATH: &[u8] = b"/usr/lib/debug";
 
 fn debug_path_exists() -> bool {
     cfg_if::cfg_if! {
-        if #[cfg(any(target_os = "freebsd", target_os = "linux"))] {
+        if #[cfg(any(target_os = "freebsd", 
+                     target_os = "netbsd",
+                     target_os = "linux"))] {
             use core::sync::atomic::{AtomicU8, Ordering};
             static DEBUG_PATH_EXISTS: AtomicU8 = AtomicU8::new(0);
 

$NetBSD: patch-vendor_backtrace_src_symbolize_gimli.rs,v 1.1 2022/05/18 20:57:28 he Exp $

Do mmap and dl_iterate_phdr() on NetBSD as well.

--- vendor/backtrace/src/symbolize/gimli.rs.orig	2022-02-23 05:34:24.000000000 +0000
+++ vendor/backtrace/src/symbolize/gimli.rs
@@ -38,6 +38,7 @@ cfg_if::cfg_if! {
         target_os = "ios",
         target_os = "linux",
         target_os = "macos",
+        target_os = "netbsd",
         target_os = "openbsd",
         target_os = "solaris",
         target_os = "illumos",
@@ -177,6 +178,7 @@ cfg_if::cfg_if! {
             target_os = "linux",
             target_os = "fuchsia",
             target_os = "freebsd",
+            target_os = "netbsd",
             target_os = "openbsd",
             all(target_os = "android", feature = "dl_iterate_phdr"),
         ),

$NetBSD: patch-vendor_backtrace_src_symbolize_gimli_elf.rs,v 1.1 2022/05/18 20:57:28 he Exp $

Make NetBSD also find its debug libraries, if present.

--- vendor/backtrace/src/symbolize/gimli/elf.rs.orig	2022-02-23 05:34:24.000000000 +0000
+++ vendor/backtrace/src/symbolize/gimli/elf.rs
@@ -276,11 +276,16 @@ fn decompress_zlib(input: &[u8], output:
     }
 }
 
+#[cfg(target_os = "netbsd")]
+const DEBUG_PATH: &[u8] = b"/usr/libdata/debug";
+#[cfg(any(target_os = "freebsd", target_os = "linux"))]
 const DEBUG_PATH: &[u8] = b"/usr/lib/debug";
 
 fn debug_path_exists() -> bool {
     cfg_if::cfg_if! {
-        if #[cfg(any(target_os = "freebsd", target_os = "linux"))] {
+        if #[cfg(any(target_os = "freebsd",
+                     target_os = "netbsd",
+                     target_os = "linux"))] {
             use core::sync::atomic::{AtomicU8, Ordering};
             static DEBUG_PATH_EXISTS: AtomicU8 = AtomicU8::new(0);
 

$NetBSD: patch-vendor_libc-0.2.108_src_unix_bsd_netbsdlike_netbsd_mod.rs,v 1.1 2022/05/18 20:57:28 he Exp $

Copy execinfo function definitions from openbsd's mod.rs.

--- vendor/libc-0.2.108/src/unix/bsd/netbsdlike/netbsd/mod.rs.orig	2022-02-23 05:34:25.000000000 +0000
+++ vendor/libc-0.2.108/src/unix/bsd/netbsdlike/netbsd/mod.rs
@@ -2700,6 +2700,22 @@ extern "C" {
     pub fn kinfo_getvmmap(pid: ::pid_t, cntp: *mut ::size_t) -> *mut kinfo_vmentry;
 }
 
+#[link(name = "execinfo")]
+extern "C" {
+    pub fn backtrace(addrlist: *mut *mut ::c_void, len: ::size_t) -> ::size_t;
+    pub fn backtrace_symbols(addrlist: *const *mut ::c_void, len: ::size_t) -> *mut *mut ::c_char;
+    pub fn backtrace_symbols_fd(
+        addrlist: *const *mut ::c_void,
+        len: ::size_t,
+        fd: ::c_int,
+    ) -> ::c_int;
+    pub fn backtrace_symbols_fmt(
+        addrlist: *const *mut ::c_void,
+        len: ::size_t,
+        fmt: *const ::c_char,
+    ) -> *mut *mut ::c_char;
+}
+
 cfg_if! {
     if #[cfg(target_arch = "aarch64")] {
         mod aarch64;