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[GCC] default to latest version (#52)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| """Version rules for toolchains""" | ||
|
|
||
| load( | ||
| "@toolchains_arm_gnu//toolchain/archives:aarch64_none_elf.bzl", | ||
| "AARCH64_NONE_ELF", | ||
| ) | ||
| load( | ||
| "@toolchains_arm_gnu//toolchain/archives:aarch64_none_linux_gnu.bzl", | ||
| "AARCH64_NONE_LINUX_GNU", | ||
| ) | ||
| load( | ||
| "@toolchains_arm_gnu//toolchain/archives:arm_none_eabi.bzl", | ||
| "ARM_NONE_EABI", | ||
| ) | ||
| load( | ||
| "@toolchains_arm_gnu//toolchain/archives:arm_none_linux_gnueabihf.bzl", | ||
| "ARM_NONE_LINUX_GNUEABIHF", | ||
| ) | ||
|
|
||
| def _semver(version): | ||
| """Parse a semantic version string into a list of integers.""" | ||
| parts = [int(i.split("-")[0]) for i in version.split(".")] | ||
| return struct( | ||
| major = parts[0], | ||
| minor = parts[1], | ||
| patch = parts[2], | ||
| ) | ||
|
|
||
| def _compare_versions(left, right): | ||
| """Compare two semantic versions.""" | ||
| left = _semver(left) | ||
| right = _semver(right) | ||
|
|
||
| # (a < b): -1, (a > b): 1, (a == b): 0. | ||
| compare = lambda a, b: int(a > b) - int(a < b) | ||
|
|
||
| return compare(left.major, right.major) or \ | ||
| compare(left.minor, right.minor) or \ | ||
| compare(left.patch, right.patch) or \ | ||
| 0 | ||
|
|
||
| def max_version(versions): | ||
| """Obtains the minimum version from the list of version strings.""" | ||
| if versions: | ||
| maximum = versions.pop(0) | ||
| for version in versions: | ||
| if _compare_versions(maximum, version) < 0: | ||
| maximum = version | ||
| return maximum | ||
| return None | ||
|
|
||
| def min_version(versions): | ||
| """Obtains the minimum version from the list of version strings.""" | ||
| if versions: | ||
| minimum = versions.pop(0) | ||
| for version in versions: | ||
| if _compare_versions(minimum, version) > 0: | ||
| minimum = version | ||
| return minimum | ||
| return None | ||
|
|
||
| def latest_version(name): | ||
| """Return the latest version of the toolchain.""" | ||
| latest = { | ||
| "arm-none-eabi": max_version(ARM_NONE_EABI.keys()), | ||
| "arm-none-linux-gnueabihf": max_version(ARM_NONE_LINUX_GNUEABIHF.keys()), | ||
| "aarch64-none-elf": max_version(AARCH64_NONE_ELF.keys()), | ||
| "aarch64-none-linux-gnu": max_version(AARCH64_NONE_LINUX_GNU.keys()), | ||
| } | ||
| return latest.get(name, None) |