docs: add dependencies and troubleshooting section to build-instructions (#35345)

* docs: add dependencies and troubleshooting section to build-instructions

* docs: update certifi description
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@ -281,9 +281,22 @@ $ cd electron
$ gclient sync -f
```
This may also happen if you have checked out a branch (as opposed to having a detached head) in `electron/src/`
or some other dependencys repository. If that is the case, a `git checkout --detach HEAD` in the appropriate repository should do the trick.
### I'm being asked for a username/password for chromium-internal.googlesource.com
If you see a prompt for `Username for 'https://chrome-internal.googlesource.com':` when running `gclient sync` on Windows, it's probably because the `DEPOT_TOOLS_WIN_TOOLCHAIN` environment variable is not set to 0. Open `Control Panel``System and Security``System``Advanced system settings` and add a system variable
`DEPOT_TOOLS_WIN_TOOLCHAIN` with value `0`. This tells `depot_tools` to use
your locally installed version of Visual Studio (by default, `depot_tools` will
try to download a Google-internal version that only Googlers have access to).
### `e` Module not found
If `e` is not recognized despite running `npm i -g @electron/build-tools`, ie:
```sh
Error: Cannot find module '/Users/<user>/.electron_build_tools/src/e'
```
We recommend installing Node through [nvm](https://github.com/nvm-sh/nvm). This allows for easier Node version management, and is often a fix for missing `e` modules.

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@ -13,6 +13,46 @@ Follow the guidelines below for building **Electron itself** on macOS, for the p
* [node.js](https://nodejs.org) (external)
* Python >= 3.7
### Arm64-specific prerequisites
* Rosetta 2
* We recommend installing Rosetta if using dependencies that need to cross-compile on x64 and arm64 machines. Rosetta can be installed by using the softwareupdate command line tool.
* `$ softwareupdate --install-rosetta`
## Building Electron
See [Build Instructions: GN](build-instructions-gn.md).
## Troubleshooting
### Xcode "incompatible architecture" errors (MacOS arm64-specific)
If both Xcode and Xcode command line tools are installed (`$ xcode -select --install`, or directly download the correct version [here](https://developer.apple.com/download/all/?q=command%20line%20tools)), but the stack trace says otherwise like so:
```sh
xcrun: error: unable to load libxcrun
(dlopen(/Users/<user>/.electron_build_tools/third_party/Xcode/Xcode.app/Contents/Developer/usr/lib/libxcrun.dylib (http://xcode.app/Contents/Developer/usr/lib/libxcrun.dylib), 0x0005):
tried: '/Users/<user>/.electron_build_tools/third_party/Xcode/Xcode.app/Contents/Developer/usr/lib/libxcrun.dylib (http://xcode.app/Contents/Developer/usr/lib/libxcrun.dylib)'
(mach-o file, but is an incompatible architecture (have (x86_64), need (arm64e))), '/Users/<user>/.electron_build_tools/third_party/Xcode/Xcode-11.1.0.app/Contents/Developer/usr/lib/libxcrun.dylib (http://xcode-11.1.0.app/Contents/Developer/usr/lib/libxcrun.dylib)' (mach-o file, but is an incompatible architecture (have (x86_64), need (arm64e)))).`
```
If you are on arm64 architecture, the build script may be pointing to the wrong Xcode version (11.x.y doesn't support arm64). Navigate to `/Users/<user>/.electron_build_tools/third_party/Xcode/` and rename `Xcode-13.3.0.app` to `Xcode.app` to ensure the right Xcode version is used.
### Certificates fail to verify
installing [`certifi`](https://pypi.org/project/certifi/) will fix the following error:
```sh
________ running 'python3 src/tools/clang/scripts/update.py' in '/Users/<user>/electron'
Downloading https://commondatastorage.googleapis.com/chromium-browser-clang/Mac_arm64/clang-llvmorg-15-init-15652-g89a99ec9-1.tgz
<urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:997)>
Retrying in 5 s ...
Downloading https://commondatastorage.googleapis.com/chromium-browser-clang/Mac_arm64/clang-llvmorg-15-init-15652-g89a99ec9-1.tgz
<urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:997)>
Retrying in 10 s ...
Downloading https://commondatastorage.googleapis.com/chromium-browser-clang/Mac_arm64/clang-llvmorg-15-init-15652-g89a99ec9-1.tgz
<urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:997)>
Retrying in 20 s ...
```
This issue has to do with Python 3.6 using its [own](https://github.com/python/cpython/blob/560ea272b01acaa6c531cc7d94331b2ef0854be6/Mac/BuildScript/resources/ReadMe.rtf#L35) copy of OpenSSL in lieu of the deprecated Apple-supplied OpenSSL libraries. `certifi` adds a curated bundle of default root certificates. This issue is documented in the Electron repo [here](https://github.com/electron/build-tools/issues/55). Further information about this issue can be found [here](https://stackoverflow.com/questions/27835619/urllib-and-ssl-certificate-verify-failed-error) and [here](https://stackoverflow.com/questions/40684543/how-to-make-python-use-ca-certificates-from-mac-os-truststore).