commit 9c7622d23e56390856cc8ce287b4537c77147dad
author Juan Cruz Viotti <jv@jviotti.com> Wed Jun 30 00:27:23 2021
committer Chromium LUCI CQ <chromium-scoped@luci-project-accounts.iam.gserviceaccount.com> Wed Jun 30 00:27:23 2021
tree 72a64e3a7c12a767e9d476d96b85cf3dcd18f2cc
parent 7ff7a41a00511275bc3059253f62f8a5bdec3474

Add and document sccache support for Windows

The two `cl.exe` flags that confused sccache on my setup, and resulted
in uncacheable calls are the following:

- `/Brepro`
- `/showIncludes:user`

This CL disables these options if `cc_wrapper` is set and documents that
`chrome_pgo_phase` must be disabled if sccache will be used.

These settings result in a high number of sccache cache hits and
significant speed-up when not using Goma:

```
Compile requests                  27222
Compile requests executed         27222
Cache hits                        27218
Cache hits (C/C++)                27218
Cache misses                          4
Cache misses (C/C++)                  4
```

For the record, this change has been tested on Windows 10 Pro 20H2,
sccache v0.2.15, and Visual Studio Community 2019 in an Electron.js
build environment.

R=thakis@chromium.org, tikuta@chromium.org

Bug: 1224369,787983
Change-Id: I8e2921aabca04598119743906ec6989ef43167ad
Signed-off-by: Juan Cruz Viotti <jv@jviotti.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2989169
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#897180}