rust-target-config: match riscv target names with what rust expects

Official rust risc-v targets are prefixed with riscv32gc- and riscv64gc-:
https://doc.rust-lang.org/nightly/rustc/platform-support.html

Particularly crossbeam-utils make important build time decisions
for atomics based on those names, and so we need to match ours
with official targets.

On the other hand, the actual definitions for those targets do not
use the 'gc' suffix in 'arch' and 'llvm-target' fields, and so we
need to follow that too, to avoid cryptic mismatch errors from rust-llvm:
https://github.com/rust-lang/rust/blob/master/compiler/rustc_target/src/spec/riscv32gc_unknown_linux_gnu.rs

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 1cfb9c8a59d98ccc9b0510cd28fb933f72fb6b6c)
Signed-off-by: Steve Sakoman <steve@sakoman.com>

diff --git a/meta/classes-recipe/rust-target-config.bbclass b/meta/classes-recipe/rust-target-config.bbclass
index 9e1d81bf5c4609f39aced47859245fd8c9d6e3d2..2710b4325d47ade61193319f5ad26115822ed157 100644 (file)
--- a/meta/classes-recipe/rust-target-config.bbclass
+++ b/meta/classes-recipe/rust-target-config.bbclass
@@ -231,19 +231,19 @@ TARGET_POINTER_WIDTH[powerpc64le] = "64"
 TARGET_C_INT_WIDTH[powerpc64le] = "64"
 MAX_ATOMIC_WIDTH[powerpc64le] = "64"
 
-## riscv32-unknown-linux-{gnu, musl}
-DATA_LAYOUT[riscv32] = "e-m:e-p:32:32-i64:64-n32-S128"
-TARGET_ENDIAN[riscv32] = "little"
-TARGET_POINTER_WIDTH[riscv32] = "32"
-TARGET_C_INT_WIDTH[riscv32] = "32"
-MAX_ATOMIC_WIDTH[riscv32] = "32"
-
-## riscv64-unknown-linux-{gnu, musl}
-DATA_LAYOUT[riscv64] = "e-m:e-p:64:64-i64:64-i128:128-n64-S128"
-TARGET_ENDIAN[riscv64] = "little"
-TARGET_POINTER_WIDTH[riscv64] = "64"
-TARGET_C_INT_WIDTH[riscv64] = "64"
-MAX_ATOMIC_WIDTH[riscv64] = "64"
+## riscv32gc-unknown-linux-{gnu, musl}
+DATA_LAYOUT[riscv32gc] = "e-m:e-p:32:32-i64:64-n32-S128"
+TARGET_ENDIAN[riscv32gc] = "little"
+TARGET_POINTER_WIDTH[riscv32gc] = "32"
+TARGET_C_INT_WIDTH[riscv32gc] = "32"
+MAX_ATOMIC_WIDTH[riscv32gc] = "32"
+
+## riscv64gc-unknown-linux-{gnu, musl}
+DATA_LAYOUT[riscv64gc] = "e-m:e-p:64:64-i64:64-i128:128-n64-S128"
+TARGET_ENDIAN[riscv64gc] = "little"
+TARGET_POINTER_WIDTH[riscv64gc] = "64"
+TARGET_C_INT_WIDTH[riscv64gc] = "64"
+MAX_ATOMIC_WIDTH[riscv64gc] = "64"
 
 # Convert a normal arch (HOST_ARCH, TARGET_ARCH, BUILD_ARCH, etc) to something
 # rust's internals won't choke on.
@@ -258,9 +258,21 @@ def arch_to_rust_target_arch(arch):
         return "arm"
     elif arch == "powerpc64le":
         return "powerpc64"
+    elif arch == "riscv32gc":
+        return "riscv32"
+    elif arch == "riscv64gc":
+        return "riscv64"
     else:
         return arch
 
+# Convert a rust target string to a llvm-compatible triplet
+def rust_sys_to_llvm_target(sys):
+    if sys.startswith('riscv32gc-'):
+        return sys.replace('riscv32gc-', 'riscv32-', 1)
+    if sys.startswith('riscv64gc-'):
+        return sys.replace('riscv64gc-', 'riscv64-', 1)
+    return sys
+
 # generates our target CPU value
 def llvm_cpu(d):
     cpu = d.getVar('PACKAGE_ARCH')
@@ -334,7 +346,7 @@ def rust_gen_target(d, thing, wd, arch):
 
     # build tspec
     tspec = {}
-    tspec['llvm-target'] = rustsys
+    tspec['llvm-target'] = rust_sys_to_llvm_target(rustsys)
     tspec['data-layout'] = d.getVarFlag('DATA_LAYOUT', arch_abi)
     if tspec['data-layout'] is None:
         bb.fatal("No rust target defined for %s" % arch_abi)

diff --git a/meta/lib/oe/rust.py b/meta/lib/oe/rust.py
index 1dc9cf150ddad17f2f93be6b6fc75f70049b81b3..185553eeeb2af0fc55bc3698864172389baa4f9b 100644 (file)
--- a/meta/lib/oe/rust.py
+++ b/meta/lib/oe/rust.py
@@ -8,4 +8,6 @@
 def arch_to_rust_arch(arch):
     if arch == "ppc64le":
         return "powerpc64le"
+    if arch in ('riscv32', 'riscv64'):
+        return arch + 'gc'
     return arch