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doc: fix environment variable settings for ccache #40550

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Oct 24, 2021
Merged

doc: fix environment variable settings for ccache #40550

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edd716b
doc: fix macOS environment variables for ccache
Trott Oct 21, 2021
31d7d6c
doc: simplify ccache instructions
Trott Oct 21, 2021
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20 changes: 14 additions & 6 deletions BUILDING.md
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Expand Up @@ -519,12 +519,20 @@ $ make test-only
If you plan to frequently rebuild Node.js, especially if using several branches,
installing `ccache` can help to greatly reduce build times. Set up with:

```console
$ sudo apt install ccache # for Debian/Ubuntu, included in most Linux distros
$ ccache -o cache_dir=<tmp_dir>
$ ccache -o max_size=5.0G
Comment on lines -524 to -525
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Should we be dropping these?

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Should we be dropping these?

ccache has a reasonable default for cache_dir so that removes the necessity to set a cache_dir explicitly. Ref: https://ccache.dev/manual/4.3.html#config_cache_dir

max_size default is 5Gb, so we don't need the step that explicitly sets it to 5Gb as well. Ref: https://ccache.dev/manual/4.3.html#config_max_size

$ export CC="ccache gcc" # add to your .profile
$ export CXX="ccache g++" # add to your .profile
On GNU/Linux:

```bash
sudo apt install ccache # for Debian/Ubuntu, included in most Linux distros
export CC="ccache gcc" # add to your .profile
export CXX="ccache g++" # add to your .profile
```

On macOS:

```bash
brew install ccache # see https://brew.sh
export CC="ccache cc" # add to ~/.zshrc or other shell config file
export CXX="ccache c++" # add to ~/.zshrc or other shell config file
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```

This will allow for near-instantaneous rebuilds even when switching branches.
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