cc_toolchain: Adds initial support for arm-none

.bazeliskrc

@@ -0,0 +1 @@
+USE_BAZEL_VERSION=4.2.2

.bazelrc

@@ -17,4 +17,8 @@ coverage --experimental_generate_llvm_lcov
 coverage --incompatible_cc_coverage
 
 # Static analyser support 
-build:analyser --aspects //tools/clang_tidy:clang_tidy.bzl%clang_tidy_aspect --output_groups=report 
+build:analyser --aspects //tools/clang_tidy:clang_tidy.bzl%clang_tidy_aspect --output_groups=report 
+
+# Enable transitions for toolchains. Required for ARM toolchain to work 
+# correctly.
+build --incompatible_override_toolchain_transition

.githooks/pre-push

@@ -11,4 +11,8 @@ bazel test $TARGETS --test_tag_filters=-benchmark
 
 bazel build $TARGETS
 
-bazel build $STATIC_ANALYZER_TARGETS --aspects //tools/clang_tidy:clang_tidy.bzl%clang_tidy_aspect --output_groups=report 
+bazel build $STATIC_ANALYZER_TARGETS --aspects //tools/clang_tidy:clang_tidy.bzl%clang_tidy_aspect --output_groups=report 
+
+echo "Test compiler agains well known ARM embedded repos."
+
+bazel build @com_github_stmicroelectronics_stm32cubel4//:stm32l4xx_hal_driver @com_github_stmicroelectronics_stm32cubel4//:stm32_cmsis_driver --platforms=//tests:stm32l432xx

.github/workflows/blank.yml

@@ -36,5 +36,12 @@ jobs:
         run: |
           bazelisk test @com_google_googletest//... @com_github_google_benchmark//... @com_google_absl//... --test_tag_filters=-benchmark
           bazelisk build @com_google_googletest//... @com_github_google_benchmark//... @com_google_absl//...
-          bazelisk build @com_google_googletest//... @com_github_google_benchmark//... @com_google_absl//... --aspects //tools/clang_tidy:clang_tidy.bzl%clang_tidy_aspect --output_groups=report 
-
+          bazelisk build @com_google_googletest//... @com_github_google_benchmark//... @com_google_absl//... --aspects //tools/clang_tidy:clang_tidy.bzl%clang_tidy_aspect --output_groups=report
+          bazelisk build @com_github_stmicroelectronics_stm32cubel4//:stm32l4xx_hal_driver @com_github_stmicroelectronics_stm32cubel4//:stm32_cmsis_driver --platforms=//tests:stm32l432xx
+
+      - name: Bazel build/test internal test repos
+        run: |
+          bazelisk build //...
+          bazelisk build //... --platforms=//tests:cortex_m0
+          bazelisk build //... --platforms=//tests:cortex_m4
+          bazelisk build //... --platforms=//tests:cortex_m7

LICENSE

@@ -1,5 +1,7 @@
 MIT License
 
+Files: default, unless otherwise specified
+
 Copyright (c) 2021 silvergasp
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
@@ -19,3 +21,14 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
+
+Apache license
+
+Files: tests/startup_stm32l432xx.s (Used for testing only, not linked).
+
+Copyright (c) 2017 STMicroelectronics. All rights reserved.
+
+This software component is licensed by ST under Apache License, Version 2.0,
+the "License"; You may not use this file except in compliance with the
+License. You may obtain a copy of the License at:
+                       opensource.org/licenses/Apache-2.0

README.md

@@ -47,6 +47,10 @@ build --incompatible_require_linker_input_cc_api
 # Use new cc toolchain resolution api
 build --incompatible_enable_cc_toolchain_resolution
 
+# Enable transitions for toolchains. Required for ARM toolchain to work 
+# correctly.
+build --incompatible_override_toolchain_transition
+
 # Code coverage support
 coverage --combined_report=lcov
 coverage --experimental_use_llvm_covmap

WORKSPACE

@@ -24,7 +24,9 @@ bazel_skylib_workspace()
 
 rules_cc_toolchain_deps()
 
-register_toolchains("//cc_toolchain/...")
+register_execution_platforms("@rules_cc_toolchain//tests/...")
+
+register_toolchains("@rules_cc_toolchain//cc_toolchain/...")
 
 # Sets up Bazels documentation generator.
 # Required by: rules_cc_toolchain.
@@ -33,6 +35,7 @@ git_repository(
     name = "io_bazel_stardoc",
     commit = "8f6d22452d088b49b13ba2c224af69ccc8ccbc90",
     remote = "https://github.com/bazelbuild/stardoc.git",
+    shallow_since = "1620849756 -0400",
 )
 
 # Sets up Bazels packaging rules, for use the document generator.

cc_toolchain/BUILD.bazel

@@ -6,6 +6,10 @@ load(
 )
 load("@bazel_skylib//:bzl_library.bzl", "bzl_library")
 load("@io_bazel_stardoc//stardoc:stardoc.bzl", "stardoc")
+load(
+    "@rules_cc_toolchain//third_party:gcc_arm_none_eabi_10_3_2021_10_x86_64_helpers.bzl",
+    ARM_NONE_EABI_LIB_INFO = "LIB_INFO",
+)
 
 cc_toolchain_import(
     name = "all_imports",
@@ -23,7 +27,7 @@ cc_toolchain_import(
 )
 
 filegroup(
-    name = "all",
+    name = "all_files",
     srcs = [
         ":all_imports",
         "//cc_toolchain/features:startup_libs",
@@ -75,12 +79,90 @@ filegroup(
     ],
 )
 
+################################ arm-none-eabi ################################
+cc_toolchain_config(
+    name = "arm_none_eabi_toolchain_config",
+    archiver = "@clang_llvm_12_00_x86_64_linux_gnu_ubuntu_16_04//:bin/llvm-ar",
+    c_compiler = "@clang_llvm_12_00_x86_64_linux_gnu_ubuntu_16_04//:bin/clang",
+    cc_compiler = "@clang_llvm_12_00_x86_64_linux_gnu_ubuntu_16_04//:bin/clang++",
+    compiler_features = [
+        # Hermetic libraries feature required before import.
+        "//cc_toolchain/features:hermetic_libraries",
+        "//cc_toolchain/features:toolchain_import",
+
+        # Common configuration.
+        "//cc_toolchain/features:garbage_collect_symbols",
+        "//cc_toolchain/features:warnings",
+        "//cc_toolchain/features:errors",
+        "//cc_toolchain/features:reproducible",
+        "//cc_toolchain/features:language",
+        "//cc_toolchain/features:use_lld",
+        "//cc_toolchain/features:sysroot",
+        "//cc_toolchain/features:dbg",
+        "//cc_toolchain/features:opt",
+        "//cc_toolchain/features:opt_standard",
+        "//cc_toolchain/features:fastbuild",
+        "//cc_toolchain/features:startup_libs",
+        "//cc_toolchain/features:coverage",
+
+        # Baremetal configuration.
+        "//cc_toolchain/features:opt_size",
+        "//cc_toolchain/features:float_abi",
+        "//cc_toolchain/features:free_standing_code",
+        "//cc_toolchain/features:no_rtti",
+
+        # ARM specific configuration.
+        "//cc_toolchain/features:arm_cpu",
+        "//cc_toolchain/features:arm_fpu",
+        "//cc_toolchain/features:thumb_target_triplet",
+    ],
+    linker = "@clang_llvm_12_00_x86_64_linux_gnu_ubuntu_16_04//:bin/ld.lld",
+    object_dump_tool = "@clang_llvm_12_00_x86_64_linux_gnu_ubuntu_16_04//:bin/llvm-objdump",
+    symbol_list_tool = "@clang_llvm_12_00_x86_64_linux_gnu_ubuntu_16_04//:bin/llvm-nm",
+)
+
+[
+    cc_toolchain(
+        name = name + "_none_eabi_toolchain",
+        all_files = ":all_files",
+        ar_files = ":ar_files",
+        as_files = ":compiler_files",
+        compiler_files = ":compiler_files",
+        dwp_files = ":all_files",
+        linker_files = ":linker_files",
+        objcopy_files = ":objcopy_files",
+        strip_files = ":strip_files",
+        supports_param_files = 0,
+        toolchain_config = ":arm_none_eabi_toolchain_config",
+        toolchain_identifier = name + "_none_eabi",
+    )
+    for name, info in ARM_NONE_EABI_LIB_INFO.items()
+]
+
+[
+    toolchain(
+        name = name + "_none_eabi_cc_toolchain",
+        exec_compatible_with = [
+            "@platforms//os:none",
+        ] + info["constraint_values"],
+        target_compatible_with = [
+            "@platforms//os:none",
+        ] + info["constraint_values"],
+        toolchain = ":" + name + "_none_eabi_toolchain",
+        toolchain_type = "@rules_cc//cc:toolchain_type",
+    )
+    for name, info in ARM_NONE_EABI_LIB_INFO.items()
+]
+
+########################### Linux x86_64 ######################################
+
 cc_toolchain(
     name = "linux_x86_64_toolchain",
-    all_files = ":all",
+    all_files = ":all_files",
     ar_files = ":ar_files",
+    as_files = ":compiler_files",
     compiler_files = ":compiler_files",
-    dwp_files = ":all",
+    dwp_files = ":all_files",
     linker_files = ":linker_files",
     objcopy_files = ":objcopy_files",
     strip_files = ":strip_files",
@@ -109,6 +191,8 @@ cc_toolchain_config(
         "//cc_toolchain/features:sysroot",
         "//cc_toolchain/features:dbg",
         "//cc_toolchain/features:opt",
+        "//cc_toolchain/features:opt_size",
+        "//cc_toolchain/features:opt_standard",
         "//cc_toolchain/features:fastbuild",
         "//cc_toolchain/features:position_independent_code",
         "//cc_toolchain/features:supports_pic",