Add support for QNX 7.1 with io-sock on x64

Author: flba-eb

compiler/rustc_target/src/spec/mod.rs

@@ -1928,6 +1928,7 @@ supported_targets! {
     ("aarch64-unknown-nto-qnx710", aarch64_unknown_nto_qnx710),
     ("aarch64-unknown-nto-qnx710_iosock", aarch64_unknown_nto_qnx710_iosock),
     ("x86_64-pc-nto-qnx710", x86_64_pc_nto_qnx710),
+    ("x86_64-pc-nto-qnx710_iosock", x86_64_pc_nto_qnx710_iosock),
     ("i586-pc-nto-qnx700", i586_pc_nto_qnx700),
 
     ("aarch64-unknown-linux-ohos", aarch64_unknown_linux_ohos),

compiler/rustc_target/src/spec/targets/x86_64_pc_nto_qnx710_iosock.rs

@@ -0,0 +1,25 @@
+use crate::spec::{Cc, LinkerFlavor, Lld, Target, TargetOptions};
+
+pub(crate) fn target() -> Target {
+    let mut target = super::x86_64_pc_nto_qnx710::target();
+    target.options.env = "nto71_iosock".into();
+    target.options.pre_link_args = TargetOptions::link_args(
+        LinkerFlavor::Gnu(Cc::Yes, Lld::No),
+        &["-Vgcc_ntox86_64_cxx", get_iosock_param()],
+    );
+    target
+}
+
+// When using `io-sock` on QNX, we must add a search path for the linker so
+// that it prefers the io-sock version.
+// The path depends on the host, i.e. we cannot hard-code it here, but have
+// to determine it when the compiler runs.
+// When using the QNX toolchain, the environment variable QNX_TARGET is always set.
+// More information:
+// https://www.qnx.com/developers/docs/7.1/index.html#com.qnx.doc.neutrino.io_sock/topic/migrate_app.html
+fn get_iosock_param() -> &'static str {
+    let target_dir = std::env::var("QNX_TARGET").expect("Environment variable QNX_TARGET is set");
+    let linker_param = format!("-L{target_dir}/x86_64/io-sock/lib");
+
+    linker_param.leak()
+}

library/std/Cargo.toml

@@ -139,7 +139,7 @@ test = true
 level = "warn"
 check-cfg = [
     'cfg(bootstrap)',
-    'cfg(target_arch, values("xtensa", "aarch64-unknown-nto-qnx710_iosock"))',
+    'cfg(target_arch, values("xtensa", "aarch64-unknown-nto-qnx710_iosock", "x86_64-pc-nto-qnx710_iosock"))',
     'cfg(target_env, values("nto71_iosock"))',
     # std use #[path] imports to portable-simd `std_float` crate
     # and to the `backtrace` crate which messes-up with Cargo list

tests/assembly/targets/targets-elf.rs

@@ -549,6 +549,9 @@
 //@ revisions: x86_64_pc_nto_qnx710
 //@ [x86_64_pc_nto_qnx710] compile-flags: --target x86_64-pc-nto-qnx710
 //@ [x86_64_pc_nto_qnx710] needs-llvm-components: x86
+//@ revisions: x86_64_pc_nto_qnx710_iosock
+//@ [x86_64_pc_nto_qnx710_iosock] compile-flags: --target x86_64-pc-nto-qnx710_iosock
+//@ [x86_64_pc_nto_qnx710_iosock] needs-llvm-components: x86
 //@ revisions: x86_64_pc_solaris
 //@ [x86_64_pc_solaris] compile-flags: --target x86_64-pc-solaris
 //@ [x86_64_pc_solaris] needs-llvm-components: x86