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rust-target-config: fix nativesdk-libstd-rs build with baremetal

Message ID 20250901103417.2794335-1-ovidiu.panait@windriver.com
State New
Headers show
Series rust-target-config: fix nativesdk-libstd-rs build with baremetal | expand

Commit Message

Ovidiu Panait Sept. 1, 2025, 10:34 a.m. UTC 
From: Ovidiu Panait <ovidiu.panait@windriver.com>

If TCLIBC='baremetal' is set in local.conf, nativesdk-libstd-rs build fails
with:

| error[E0412]: cannot find type `c_char` in the crate root
|   --> /usr/src/debug/libstd-rs/1.75.0/rustc-1.75.0-src/vendor/libc/src/unix/mod.rs:56:29
|    |
| 6  | pub type c_schar = i8;
|    | ---------------------- similarly named type alias `c_schar` defined here
| ...
| 56 |         pub gr_name: *mut ::c_char,
|    |                             ^^^^^^

This happens because rust_gen_target() sets os="none" when TCLIBC is
'baremetal' - even for nativesdk targets. However, nativesdk packages are
built against glibc, so the correct 'os' value should be "linux".

Fix this by setting the os field based on {TARGET,HOST,BUILD}_OS variables,
as it is already done in rust_base_triple(), instead of relying on TCLIBC.

Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
---
 meta/classes-recipe/rust-target-config.bbclass | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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Patch

diff --git a/meta/classes-recipe/rust-target-config.bbclass b/meta/classes-recipe/rust-target-config.bbclass
index 0df6f0904c..43befff9f1 100644
--- a/meta/classes-recipe/rust-target-config.bbclass
+++ b/meta/classes-recipe/rust-target-config.bbclass
@@ -349,6 +349,7 @@  def rust_gen_target(d, thing, wd, arch):
     sys = d.getVar('{}_SYS'.format(thing))
     prefix = d.getVar('{}_PREFIX'.format(thing))
     rustsys = d.getVar('RUST_{}_SYS'.format(thing))
+    os = d.getVar('{}_OS'.format(thing))
 
     abi = None
     cpu = "generic"
@@ -388,7 +389,7 @@  def rust_gen_target(d, thing, wd, arch):
     tspec['target-c-int-width'] = d.getVarFlag('TARGET_C_INT_WIDTH', arch_abi)
     tspec['target-endian'] = d.getVarFlag('TARGET_ENDIAN', arch_abi)
     tspec['arch'] = arch_to_rust_target_arch(rust_arch)
-    if "baremetal" in d.getVar('TCLIBC'):
+    if "elf" in os:
         tspec['os'] = "none"
     else:
         tspec['os'] = "linux"