[OE-core][PATCH] rust-target-config: set MIPS ABI in the target JSON

["WXbet" <WXbet@proton.me>]

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rustc 1.96 (rust-lang/rust#153769) started rejecting MIPS target JSON
files that do not carry both an "abi" field and a matching "llvm-
abiname" field, aborting libstd-rs's do_compile with

error: error loading target specification:
invalid MIPS ABI name and `cfg(target_abi)` combination:
ABI name: <empty>
cfg(target_abi): <empty>

rust_gen_target() populates the target JSON from the DATA_LAYOUT /
TARGET_ENDIAN / ... varflags plus an arch-specific "abi" branch that
today only covers arm/armv7. On mips*/mipsel* neither "abi" nor
"llvm-abiname" is written, so rustc's stricter check fails.

Cover every MIPS tune shipped in meta/conf/machine/include/mips/
arch-mips.inc's AVAILTUNES:

arch=mips / mipsel                      -> o32
arch=mips64 / mips64el, ABIEXTENSION="" -> n64
arch=mips64 / mips64el, ABIEXTENSION=n32 -> n32

Note that the mips64-o32 / mips64el-o32 tunes (o32 ABI on a 64-bit
MIPS CPU) get MIPSPKGSFX_BYTE="" from arch-mips.inc and therefore
TUNE_ARCH="mips[el]"; they fall into the 32-bit branch above.

Signed-off-by: WXbet <57314510+WXbet@users.noreply.github.com>
---
meta/classes-recipe/rust-target-config.bbclass | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/meta/classes-recipe/rust-target-config.bbclass b/meta/classes-recipe/rust-target-config.bbclass
index 6acbe5e688..54919091fe 100644
--- a/meta/classes-recipe/rust-target-config.bbclass
+++ b/meta/classes-recipe/rust-target-config.bbclass
@@ -438,6 +438,13 @@ def rust_gen_target(d, thing, wd, arch):
elif fpu == "hard":
tspec['abi'] = "eabihf"
tspec['llvm-floatabi'] = "hard"
+    if arch in ["mips", "mipsel"]:
+        tspec['abi'] = "o32"
+        tspec['llvm-abiname'] = "o32"
+    elif arch in ["mips64", "mips64el"]:
+        mips_abi = "n32" if abi == "n32" else "n64"
+        tspec['abi'] = mips_abi
+        tspec['llvm-abiname'] = mips_abi
tspec['default-uwtable'] = True
tspec['dynamic-linking'] = True
tspec['executables'] = True
--
2.47.1.windows.1

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