doc: simplify ccache instructions

Trott · targos · commit 5e2d0ed61e76 · 2021-11-06T10:56:43.000+01:00
`ccache` has reasonable defaults for `max_size` and `cache_dir` so remove instructions to set those things explicitly. Change fenced code from `console` to `bash` for easier copy/paste. PR-URL: #40550 Fixes: #40542 Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com> Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
diff --git a/BUILDING.md b/BUILDING.md
@@ -521,22 +521,18 @@ installing `ccache` can help to greatly reduce build times. Set up with:
 
 On GNU/Linux:
 
-```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
-$ export CC="ccache gcc"    # add to your .profile
-$ export CXX="ccache g++"   # add to your .profile
+```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:
 
-```console
-$ brew install ccache      # see https://brew.sh
-$ ccache -o cache_dir=<tmp_dir>
-$ ccache -o max_size=5.0G
-$ export CC="ccache cc"    # add to ~/.zshrc or other shell config file
-$ export CXX="ccache c++"  # add to ~/.zshrc or other shell config file
+```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
 ```
 
 This will allow for near-instantaneous rebuilds even when switching branches.
