Auto merge of #109173 - flba-eb:add-i586-qnx70-target, r=compiler-errors

Add tier 3 no_std x86 support for QNX Neutrino RTOS, version 7.0

This PR adds the target `i586-pc-nto-qnx700`, which targets QNX Neutrino RTOS version 7.0 on x86 32-bit targets.

cc: `@flba-eb` `@gh-tr`

This target falls under the umbrella of Tier 3 QNX Neutrino RTOS support documented in `nto-qnx.md` and previously started with #102701.

2 files changed, 13 insertions, 3 deletions

diff --git a/src/doc/rustc/src/platform-support.md b/src/doc/rustc/src/platform-support.md
index 5c18a38ddab..67fe2a610c2 100644
--- a/src/doc/rustc/src/platform-support.md
+++ b/src/doc/rustc/src/platform-support.md
@@ -257,6 +257,7 @@ target | std | host | notes
 `bpfel-unknown-none` | * |  | BPF (little endian)
 `hexagon-unknown-linux-musl` | ? |  |
 `i386-apple-ios` | ✓ |  | 32-bit x86 iOS
+[`i586-pc-nto-qnx700`](platform-support/nto-qnx.md) | * |  | 32-bit x86 QNX Neutrino 7.0 RTOS |
 `i686-apple-darwin` | ✓ | ✓ | 32-bit macOS (10.7+, Lion+)
 `i686-pc-windows-msvc` | * |  | 32-bit Windows XP support
 `i686-unknown-haiku` | ✓ | ✓ | 32-bit Haiku
diff --git a/src/doc/rustc/src/platform-support/nto-qnx.md b/src/doc/rustc/src/platform-support/nto-qnx.md
index 38198fe6c3a..0d815c9b598 100644
--- a/src/doc/rustc/src/platform-support/nto-qnx.md
+++ b/src/doc/rustc/src/platform-support/nto-qnx.md
@@ -16,10 +16,18 @@ and [Blackberry QNX][BlackBerry].
 
 ## Requirements
 
-Currently, only cross-compilation for QNX Neutrino on AArch64 and x86_64 are supported (little endian).
+Currently, the following QNX Neutrino versions and compilation targets are supported:
+
+| QNX Neutrino Version | Target Architecture | Full support | `no_std` support |
+|----------------------|---------------------|:------------:|:----------------:|
+| 7.1 | AArch64 | ✓ | ✓ |
+| 7.1 | x86_64  | ✓ | ✓ |
+| 7.0 | x86     |   | ✓ |
+
 Adding other architectures that are supported by QNX Neutrino is possible.
 
-The standard library, including `core` and `alloc` (with default allocator) are supported.
+In the table above, 'full support' indicates support for building Rust applications with the full standard library.
+'`no_std` support' indicates that only `core` and `alloc` are available.
 
 For building or using the Rust toolchain for QNX Neutrino, the
 [QNX Software Development Platform (SDP)](https://blackberry.qnx.com/en/products/foundation-software/qnx-software-development-platform)
@@ -70,7 +78,7 @@ fn panic(_panic: &PanicInfo<'_>) -> ! {
 pub extern "C" fn rust_eh_personality() {}
 ```
 
-The QNX Neutrino support of Rust has been tested with QNX Neutrino 7.1.
+The QNX Neutrino support of Rust has been tested with QNX Neutrino 7.0 and 7.1.
 
 There are no further known requirements.
 
@@ -80,6 +88,7 @@ For conditional compilation, following QNX Neutrino specific attributes are defi
 
 - `target_os` = `"nto"`
 - `target_env` = `"nto71"` (for QNX Neutrino 7.1)
+- `target_env` = `"nto70"` (for QNX Neutrino 7.0)
 
 ## Building the target