Rollup merge of #76798 - alistair23:alistair/rv32-linux, r=jyn514

Build fixes for RISC-V 32-bit Linux support

This fixes build issues with the 32-bit RISC-V port.

Author: RalfJung

library/panic_unwind/src/gcc.rs

@@ -120,7 +120,7 @@ const UNWIND_DATA_REG: (i32, i32) = (24, 25); // I0, I1
 #[cfg(target_arch = "hexagon")]
 const UNWIND_DATA_REG: (i32, i32) = (0, 1); // R0, R1
 
-#[cfg(target_arch = "riscv64")]
+#[cfg(any(target_arch = "riscv64", target_arch = "riscv32"))]
 const UNWIND_DATA_REG: (i32, i32) = (10, 11); // x10, x11
 
 // The following code is based on GCC's C and C++ personality routines.  For reference, see:

library/std/src/os/linux/raw.rs

@@ -234,7 +234,8 @@ mod arch {
     target_arch = "mips64",
     target_arch = "s390x",
     target_arch = "sparc64",
-    target_arch = "riscv64"
+    target_arch = "riscv64",
+    target_arch = "riscv32"
 ))]
 mod arch {
     pub use libc::{blkcnt_t, blksize_t, ino_t, nlink_t, off_t, stat, time_t};

library/std/src/os/raw/mod.rs

@@ -22,7 +22,8 @@ mod tests;
             target_arch = "powerpc",
             target_arch = "powerpc64",
             target_arch = "s390x",
-            target_arch = "riscv64"
+            target_arch = "riscv64",
+            target_arch = "riscv32"
         )
     ),
     all(target_os = "android", any(target_arch = "aarch64", target_arch = "arm")),
@@ -65,7 +66,8 @@ pub type c_char = u8;
             target_arch = "powerpc",
             target_arch = "powerpc64",
             target_arch = "s390x",
-            target_arch = "riscv64"
+            target_arch = "riscv64",
+            target_arch = "riscv32"
         )
     ),
     all(target_os = "android", any(target_arch = "aarch64", target_arch = "arm")),

library/std/src/sys_common/alloc.rs

@@ -14,7 +14,8 @@ use crate::ptr;
     target_arch = "powerpc64",
     target_arch = "asmjs",
     target_arch = "wasm32",
-    target_arch = "hexagon"
+    target_arch = "hexagon",
+    target_arch = "riscv32"
 )))]
 pub const MIN_ALIGN: usize = 8;
 #[cfg(all(any(

library/unwind/src/libunwind.rs

@@ -54,7 +54,7 @@ pub const unwinder_private_data_size: usize = 2;
 #[cfg(target_arch = "sparc64")]
 pub const unwinder_private_data_size: usize = 2;
 
-#[cfg(target_arch = "riscv64")]
+#[cfg(any(target_arch = "riscv64", target_arch = "riscv32"))]
 pub const unwinder_private_data_size: usize = 2;
 
 #[cfg(target_os = "emscripten")]

src/tools/build-manifest/src/main.rs

@@ -111,6 +111,7 @@ static TARGETS: &[&str] = &[
     "riscv32i-unknown-none-elf",
     "riscv32imc-unknown-none-elf",
     "riscv32imac-unknown-none-elf",
+    "riscv32gc-unknown-linux-gnu",
     "riscv64imac-unknown-none-elf",
     "riscv64gc-unknown-none-elf",
     "riscv64gc-unknown-linux-gnu",