Implement configuration for Rust compiler and other build-dependencies

- Add build.rust_build_depends, and build.enable_rust configuration
  fields.  The enable_rust field is expected to be set
  per-architecture while rust_build_depends can be global.

- Define a pkg.linux.norust build profile which disables use of Rust.

- For architectures where build.enable_rust is set, Build-Depend on
  everything in build.rust_build_depends, with a restriction to
  <!pkg.linux.nokernel !pkg.linux.norust>.

This doesn't support compiling OOT modules written in Rust, which is a
rather harder problem.

debian/README.source

@@ -241,6 +241,7 @@ Several build profiles are understood and supported:
 - pkg.linux.nokerneldbg: Exclude kernel debug packages
 - pkg.linux.nokerneldbginfo: Build kernel without debug symbols (also disables
   BTF)
+- pkg.linux.norust: Build without a Rust compiler
 - pkg.linux.nosource: Exclude source binary package (linux-source-<version>)
 - cross: Needed when cross-building.
 - nopython: Disable Python bindings.  This currently disables building the

debian/bin/gencontrol.py

@@ -316,6 +316,15 @@ linux-signed-{vars['arch']} (@signedtemplate_sourceversion@) {dist}; urgency={ur
                 restrictions='<!pkg.linux.nokernel>',
             )
         ])
+        if config.build.enable_rust:
+            for group in config.build.rust_build_depends:
+                self.bundle.source.build_depends_arch.merge(
+                    PackageRelationGroup(
+                        group,
+                        arches={arch},
+                        restrictions='<!pkg.linux.nokernel !pkg.linux.norust>',
+                    )
+                )
 
         # Generate compiler build-depends for kernel:
         # gcc-N-hppa64-linux-gnu [hppa] <!pkg.linux.nokernel>

debian/changelog

@@ -18,6 +18,7 @@ linux (6.18~rc7-1~exp1) experimental; urgency=medium
   * module: Disable MODVERSIONS, MODULE_ALLOW_BTF_MISMATCH
   * d/l/p/debian_linux/debian.py: Allow adding restrictions to
     PackageRelationGroup
+  * Implement configuration for Rust compiler and other build-dependencies
 
  -- Salvatore Bonaccorso <carnil@debian.org>  Mon, 24 Nov 2025 17:51:01 +0100
 

debian/lib/python/debian_linux/config_v2.py

@@ -45,6 +45,8 @@ class ConfigBuild:
     c_compiler: Optional[str] = None
     compiler_gnutype: Optional[str] = None
     compiler_gnutype_compat: Optional[str] = None
+    rust_build_depends: list[PackageRelationGroup] = dataclasses.field(default_factory=list)
+    enable_rust: Optional[bool] = None
     config: list[Path] = dataclasses.field(default_factory=list)
     config_default: list[Path] = dataclasses.field(default_factory=list, repr=False)
     enable_signed: Optional[bool] = None

debian/rules.real

@@ -78,7 +78,8 @@ $(BUILD_DIR)/config.$(ARCH)_$(FEATURESET)_$(FLAVOUR): $(KCONFIG)
 	mkdir -p '$(dir $@)'
 	debian/bin/kconfig.py '$@' $(KCONFIG) $(KCONFIG_OPTIONS) \
 		-o MODULE_SIG_KEY=\"output/signing_key.pem\" \
-		$(call if_profile, pkg.linux.nokerneldbginfo pkg.linux.quick,-o DEBUG_INFO_NONE=y -o DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=n)
+		$(call if_profile, pkg.linux.nokerneldbginfo pkg.linux.quick,-o DEBUG_INFO_NONE=y -o DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=n) \
+		$(call if_profile, pkg.linux.norust,-o RUST=n)
 
 define copy_source
 mkdir -p '$(1)'