On Wed, 12 Aug 2026 18:15:41 GMT, Ashay Rane <[email protected]> wrote:
>> This patch enables the `--enable-sccache` flag to enable build caching
>> using sccache. Specifically, if the toolchain is one among gcc, clang,
>> or MSVC and if the sccache version is 0.10 and above, then the build
>> prefixes all compiler invocations with the path to the sccache binary.
>>
>> Since sccache is incompatible with ccache and precompiled headers, this
>> patch makes the build fail if either ccache or precompiled headers are
>> enabled in addition to sccache at the same time.
>>
>> Validated this patch on {Linux, Windows, macOS} x {x64, aarch64}
>> machines. In the best-case scenario (i.e. when there are no changes to
>> the source files), the time required to run the "make images" step is
>> roughly cut in half. Side note: the individual machines have very
>> different configurations, so build times _across_ machines aren't
>> comparable.
>>
>> - Windows/x64: 2,107s -> 848s
>> - Windows/ARM64: 1,264s -> 748s
>> - macOS/x64: 808s -> 243s
>> - macOS/AArch64: 480s -> 142s
>> - Linux/x64: 225s -> 111s
>> - Linux/AArch64: 364s -> 246s
>>
>> ---------
>> - [x] I confirm that I make this contribution in accordance with the
>> [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai).
>
> Ashay Rane has updated the pull request incrementally with one additional
> commit since the last revision:
>
> Add comment explaining why we can't use `UTIL_FIXUP_PATH()`.
Marked as reviewed by erikj (Reviewer).
-------------
PR Review: https://git.openjdk.org/jdk/pull/32059#pullrequestreview-4920057794
