Add patches support for SDP toolchain archives

Introduce a patches to the SDP tag class so patches can be
applied to downloaded toolchain archives. The attributes are threaded
through `_get_packages`, `_create_and_link_sdp`, and the archive
download in `_impl`. Documentation is also update to follow up new
attribute set.

Author: nradakovic

docs/extension_api.md

@@ -48,53 +48,89 @@ Declares a toolchain repository to generate.
 
 Declares a package repository explicitly. This is used when the package is not
 taken from the default version matrix or when local QNX SDP generation is
-required.
+required. The tag is nothing more than a thin proxy to the native `http_archive`
+repository rule: its attributes are passed straight through to `http_archive`
+with no additional processing.
 
 ## `gcc.toolchain(...)` Attributes
 
 Required attributes:
 
-- `name`: name of the generated repository
-- `target_cpu`: target CPU, currently `x86_64` or `aarch64`
-- `target_os`: target OS, currently `linux` or `qnx`
+- `name` (mandatory): toolchain repo name, default set to `score_gcc_toolchain`.
+- `target_cpu` (mandatory): target platform CPU, currently `x86_64` or `aarch64`.
+- `target_os` (mandatory): target platform OS, currently `linux` or `qnx`.
 
 Common package selection attributes:
 
-- `use_default_package`: resolve package metadata from `packages/version_matrix.bzl`
+- `use_default_package`: whether to use the default package from the version
+  matrix, default set to `False`.
 - `version`: GCC version string for Linux toolchains (e.g. `12.2.0` or `15.3.0` —
-  see `packages/version_matrix.bzl` for all versions currently packaged)
-- `sdp_version`: QNX SDP version string
-- `sdk_version`: alternative SDK identifier used in matrix resolution
-- `sdp_to_link`: override the package repository name that the toolchain uses
+  see `packages/version_matrix.bzl` for all versions currently packaged).
+- `sdp_version`: version of the SDP package.
+- `sdk_version`: SDK version info variable, an alternative identifier used in
+  matrix resolution.
+- `sdp_to_link`: name of the toolchain package to be linked with this
+  toolchain, default set to toolchain name + `_pkg`.
+- `use_system_toolchain`: TBD.
 
 Flag and runtime attributes:
 
-- `extra_compile_flags`
-- `extra_c_compile_flags`
-- `extra_cxx_compile_flags`
-- `extra_link_flags`
-- `extra_known_features`
-- `extra_enabled_features`
-- `ld_library_paths`
-- `runtime_ecosystem`
-- `use_base_constraints_only`
+- `extra_compile_flags`: list of additional flags to be passed to compiler.
+- `extra_c_compile_flags`: list of additional flags to be passed to C compiler.
+- `extra_cxx_compile_flags`: list of additional flags to be passed to C++
+  compiler.
+- `extra_link_flags`: list of additional flags to be passed to linker.
+- `extra_known_features`: extra `cc_feature` features to add to this toolchain
+  in an initially disabled state. See [Feature Injection](#feature-injection).
+- `extra_enabled_features`: extra `cc_feature` features to add to this
+  toolchain in an initially enabled state. See [Feature Injection](#feature-injection).
+- `ld_library_paths`: list of paths relative to the sysroot which should build
+  up the runtime linker path of the tools of this toolchain.
+- `runtime_ecosystem`: attribute for identifying the system-level runtime
+  environment a binary or target is built to run in.
+- `use_base_constraints_only`: experimental. Attribute for flag toolchain
+  creation to use only base platform constraints. Limits toolchain
+  registration to 1 per base platform definition.
 
 QNX-specific attributes:
 
-- `license_path`
-- `license_info_variable`
-- `license_info_url`
+- `license_path`: path to the shared license file, default set to
+  `/opt/score_qnx/license/licenses`.
+- `license_info_variable`: QNX license info variable.
+- `license_info_url`: URL of the QNX license server.
 
 ## `gcc.sdp(...)` Attributes
 
-The `gcc.sdp` tag defines the package side of the toolchain setup. Important
-attributes are:
-
-- `name`: repository name for the package
-- `build_file`: BUILD file that exposes the package contents as Bazel targets
-- `url`: url of the archive,
-- `sha256`: sha256 of the archive
-- `strip_prefix`: extraction prefix for packaged archives
+The `gcc.sdp` tag defines the package side of the toolchain setup. It is a
+proxy to `http_archive`: every attribute below maps 1:1 to the identically
+named `http_archive` attribute, so refer to the Bazel `http_archive` docs for
+full semantics. Its attributes are:
+
+- `name`: package name of toolchain, default set to toolchain name + `_pkg`.
+- `build_file`: the path to the BUILD file of selected archive.
+- `url`: url to the toolchain archive.
+- `sha256`: checksum of the archive.
+- `strip_prefix`: strip prefix from toolchain archive.
+- `files`: a map of relative paths (key) to a file label (value) that is
+  overlaid on the repo as a symlink.
+- `patches`: list of patches to apply to the archive.
+- `patch_args`: the arguments given to the patch tool. Defaults to `-p0` (see
+  the `patch_strip` attribute), however `-p1` will usually be needed for
+  patches generated by git. When arguments other than `-p` are specified,
+  Bazel falls back to the `patch` command line tool instead of the
+  Bazel-native patch implementation. Only affects patch files in the
+  `patches` attribute.
+- `patch_cmds`: bash commands executed in the extracted archive root after
+  extraction.
+- `patch_strip`: when set to `N`, this is equivalent to inserting `-pN` to the
+  beginning of `patch_args`.
+- `patch_tool`: the patch(1) utility to use. If specified, Bazel uses the
+  specified patch tool instead of the Bazel-native patch implementation.
+
+These `patch_*`/`files` attributes are only wired for archives declared
+directly with `gcc.sdp(...)`. Default packages resolved from
+`packages/version_matrix.bzl` fall back to their attribute defaults (empty
+list/string, `0`) since the version matrix does not carry these fields.
 
 ## Feature Injection
 

docs/generation_flow.md

@@ -40,7 +40,8 @@ toolchain repository through these steps:
 `packages/version_matrix.bzl`
 
 Defines the supported package matrix. Each entry maps a logical toolchain key
-to download metadata and, when needed, extra compiler or linker flags.
+to download metadata and, when needed, extra compiler or linker flags and
+archive patches.
 
 `rules/common.bzl`
 

docs/repository_layout.md

@@ -48,7 +48,7 @@ Contains the repository rules that materialize a toolchain repository.
 
 Stores package metadata and BUILD descriptors for supported toolchain
 archives. The most important file is `packages/version_matrix.bzl`, which maps
-logical toolchain identifiers to URLs, checksums, build files, and any
+logical toolchain identifiers to URLs, checksums, build files, patches, and any
 required extra flags.
 
 `features/`

extensions/gcc.bzl

@@ -35,15 +35,46 @@ _attrs_sdp = {
         default = None,
         doc = "The path to the BUILD file of selected archive.",
     ),
+    "files": attr.string_keyed_label_dict(
+        mandatory = False,
+        default = {},
+        doc = "A map of relative paths (key) to a file label (value) that overlaid on the repo as a symlink.",
+    ),
     "name": attr.string(
         default = "",
         doc = "package name of toolchain, default set to toolchain toolchain name + `_pkg`.",
     ),
+    "patch_args": attr.string_list(
+        mandatory = False,
+        default = [],
+        doc =
+            "The arguments given to the patch tool. Defaults to -p0 (see the `patch_strip` " +
+            "attribute), however -p1 will usually be needed for patches generated by " +
+            "git. If multiple -p arguments are specified, the last one will take effect." +
+            "If arguments other than -p are specified, Bazel will fall back to use patch " +
+            "command line tool instead of the Bazel-native patch implementation. When falling " +
+            "back to patch command line tool and patch_tool attribute is not specified, " +
+            "`patch` will be used. This only affects patch files in the `patches` attribute.",
+    ),
     "patch_cmds": attr.string_list(
         mandatory = False,
         default = [],
         doc = "Bash commands executed in the extracted archive root after extraction.",
     ),
+    "patch_strip": attr.int(
+        default = 0,
+        doc = "When set to `N`, this is equivalent to inserting `-pN` to the beginning of `patch_args`.",
+    ),
+    "patch_tool": attr.string(
+        default = "",
+        doc = "The patch(1) utility to use. If this is specified, Bazel will use the specified " +
+              "patch tool instead of the Bazel-native patch implementation.",
+    ),
+    "patches": attr.label_list(
+        mandatory = False,
+        default = [],
+        doc = "List of patches to apply to the archive.",
+    ),
     "sha256": attr.string(
         mandatory = False,
         default = "",
@@ -190,10 +221,15 @@ def _get_packages(tags):
         packages.append({
             "build_file": tag.build_file,
             "name": tag.name,
+            "patch_args": tag.patch_args,
             "patch_cmds": tag.patch_cmds,
+            "patch_strip": tag.patch_strip,
+            "patch_tool": tag.patch_tool,
             "sha256": tag.sha256,
             "strip_prefix": tag.strip_prefix,
             "url": tag.url,
+            "patches": tag.patches,
+            "files": tag.files,
         })
     return packages
 
@@ -306,10 +342,16 @@ def _create_and_link_sdp(toolchain_info):
     return {
         "build_file": matrix["build_file"],
         "name": pkg_name,
+        # patch_args/patch_strip/patch_tool are not part of the version matrix; fall back to sdp tag defaults.
+        "patch_args": matrix.get("patch_args", []),
         "patch_cmds": matrix.get("patch_cmds", []),
+        "patch_strip": matrix.get("patch_strip", 0),
+        "patch_tool": matrix.get("patch_tool", ""),
         "sha256": matrix["sha256"],
         "strip_prefix": matrix["strip_prefix"],
         "url": matrix["url"],
+        "patches": matrix.get("patches"),
+        "files": matrix.get("files"),
     }
 
 def _resolve_identifier(toolchain_info):
@@ -395,9 +437,14 @@ def _impl(mctx):
             name = archive_info["name"],
             urls = [archive_info["url"]],
             build_file = archive_info["build_file"],
+            patch_args = archive_info["patch_args"],
             patch_cmds = archive_info["patch_cmds"],
+            patch_strip = archive_info["patch_strip"],
+            patch_tool = archive_info["patch_tool"],
             sha256 = archive_info["sha256"],
             strip_prefix = archive_info["strip_prefix"],
+            patches = archive_info["patches"],
+            files = archive_info["files"],
         )
 
     for toolchain_info in toolchains:

packages/version_matrix.bzl

@@ -20,6 +20,7 @@ VERSION_MATRIX = {
         "sha256": "7279b1adb50361b21f5266b001980b6febb35fa8d83170901196b9edae3f06d9",
         "strip_prefix": "aarch64-unknown-linux-gnu",
         "url": "https://github.com/eclipse-score/toolchains_gcc_packages/releases/download/v0.0.4/aarch64-unknown-linux-gnu_gcc12.tar.gz",
+        "patches": [],
     },
     "aarch64-linux-gcc_15.3.0": {
         "build_file": "@score_bazel_cpp_toolchains//packages/linux/aarch64/gcc/15.3.0:gcc.BUILD",
@@ -71,26 +72,31 @@ VERSION_MATRIX = {
         "sha256": "e2f6a21681730e61ce39af19758003ba3568b093956a57cde136d5c73cf6540a",
         "strip_prefix": "sysroot",
         "url": "https://github.com/eclipse-score/os_autosd/releases/download/v0.0.2/autosd-toolchain-aarch64.tar.gz",
+        "patches": [],
     },
     "aarch64-qnx-sdp_8.0.0": {
         "build_file": "@score_bazel_cpp_toolchains//packages/qnx/aarch64/sdp/8.0.0:sdp.BUILD",
         "sha256": "f2e0cb21c6baddbcb65f6a70610ce498e7685de8ea2e0f1648f01b327f6bac63",
         "strip_prefix": "installation",
         "url": "https://www.qnx.com/download/download/79858/installation.tgz",
         "gcc_version": "12.2.0",
+        "patches": [],
     },
     "aarch64-qnx-sdp_8.0.4": {
         "build_file": "@score_bazel_cpp_toolchains//packages/qnx/aarch64/sdp/8.0.0:sdp.BUILD",
         "sha256": "146312c0bf22aab66e8294a06403f2ec6cfeeb074d8fa11549faffd84b7fe778",
         "strip_prefix": "",
         "url": "https://www.qnx.com/download/download/88447/installation_qnx_804_260520.tar.xz",
         "gcc_version": "12.2.0",
+        "files": {
+        },
     },
     "x86_64-linux-gcc_12.2.0": {
         "build_file": "@score_bazel_cpp_toolchains//packages/linux/x86_64/gcc/12.2.0:gcc.BUILD",
         "sha256": "e9b9a7a63a5f8271b76d6e2057906b95c7a244e4931a8e10edeaa241e9f7c11e",
         "strip_prefix": "x86_64-unknown-linux-gnu",
         "url": "https://github.com/eclipse-score/toolchains_gcc_packages/releases/download/v0.0.4/x86_64-unknown-linux-gnu_gcc12.tar.gz",
+        "patches": [],
     },
     "x86_64-linux-gcc_15.3.0": {
         "build_file": "@score_bazel_cpp_toolchains//packages/linux/x86_64/gcc/15.3.0:gcc.BUILD",
@@ -142,6 +148,7 @@ VERSION_MATRIX = {
         "sha256": "25991056bd29d4cb37b11e42d0c09f55dc61d0b9d703f75d854cf614f688c96f",
         "strip_prefix": "sysroot",
         "url": "https://github.com/eclipse-score/os_autosd/releases/download/v0.0.2/autosd-toolchain-x86_64.tar.gz",
+        "patches": [],
     },
     "aarch64-linux-sdk_0.1.0-ebclfsa": {
         "build_file": "@score_bazel_cpp_toolchains//packages/linux/aarch64/ebclfsa/0.1.0:ebclfsa.BUILD",
@@ -204,6 +211,7 @@ VERSION_MATRIX = {
         "strip_prefix": "fastdev-sdk-ubuntu-ebclfsa-ebcl-qemuarm64",
         "sha256": "f44286c28d831dc40acdac08ef49f38a2e9cbb057bea38c25834964693785287",
         "url": "https://github.com/Elektrobit/eb_corbos_toolkit/releases/download/v2.0.0-beta1/fastdev-sdk-ubuntu-ebclfsa-ebcl-qemuarm64.tar.gz",
+        "patches": [],
     },
     "aarch64-linux-sdk_2.0.0-beta2-ebclfsa": {
         "build_file": "@score_bazel_cpp_toolchains//packages/linux/aarch64/ebclfsa/2.0.0-beta2:ebclfsa.BUILD",
@@ -303,7 +311,7 @@ VERSION_MATRIX = {
         "url": "https://www.qnx.com/download/download/79858/installation.tgz",
         "gcc_version": "12.2.0",
     },
-    "x86_64-qnx-sdp_8.0.4": {
+    "x86_64-qnx-sdp_8.0.5": {
         "build_file": "@score_bazel_cpp_toolchains//packages/qnx/x86_64/sdp/8.0.0:sdp.BUILD",
         "sha256": "146312c0bf22aab66e8294a06403f2ec6cfeeb074d8fa11549faffd84b7fe778",
         "strip_prefix": "",

rules/common.bzl

@@ -20,7 +20,10 @@ load("@bazel_tools//tools/cpp:cc_toolchain_config_lib.bzl", "flag_group")
 # Certain SDP versions are mapped to canonical versions used in platform constraints.
 # For example, SDP 8.0.4 is mapped to 8.0.0 because platform constraint support
 # uses the older identifier.
-SDP_VERSION_MAPPING = {"8.0.4": "8.0.0"}
+SDP_VERSION_MAPPING = {
+    "8.0.4": "8.0.0",
+    "8.0.5": "8.0.0",
+}
 
 def get_flag_strings(flags):
     """Converts a list of warning flags into a Bazel flag group representation.

tests/MODULE.bazel

@@ -148,18 +148,29 @@ gcc.toolchain(
 )
 
 # *******************************************************************************
-# Setting GCC (CPU:x86_64|OS:QNX|version(sdp):8.0.0|ES:posix)
+# Setting GCC (CPU:x86_64|OS:QNX|version(sdp):8.0.4|ES:posix)
+# *******************************************************************************
+# gcc.toolchain(
+#     name = "score_qcc_toolchain",
+#     sdp_version = "8.0.4",
+#     target_cpu = "x86_64",
+#     target_os = "qnx",
+#     use_default_package = True,
+# )
+
+# *******************************************************************************
+# Setting GCC (CPU:x86_64|OS:QNX|version(sdp):8.0.5|ES:posix)
 # *******************************************************************************
 gcc.toolchain(
     name = "score_qcc_toolchain",
-    sdp_version = "8.0.4",
+    sdp_version = "8.0.5",
     target_cpu = "x86_64",
     target_os = "qnx",
     use_default_package = True,
 )
 
 # *******************************************************************************
-# Setting GCC (CPU:aarch64|OS:QNX|version(sdp):8.0.0|ES:posix)
+# Setting GCC (CPU:aarch64|OS:QNX|version(sdp):8.0.4|ES:posix)
 # *******************************************************************************
 gcc.toolchain(
     name = "score_qcc_arm_toolchain",