README: example with CCache

CCache is often used to accelerate the kernel rebuilds. It is not difficult to use it, but people might not think about it, and setting KBUILD_BUILD_TIMESTAMP=0 to increase the cache hits might not be well known. Signed-off-by: Matthieu Baerts (NGI0) <[email protected]>
arighi · Feb 26, 2025 · 53eb5f6 · 53eb5f6
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@@ -227,6 +227,14 @@ Examples
    $ vng O=.virtme/build --verbose
 ```
 
+ - Accelerate the kernel rebuilds using CCache (if installed):
+```
+   $ PATH="/usr/lib/ccache:${PATH}" \
+       KBUILD_BUILD_TIMESTAMP=0 \
+       vng --build
+   # or export the two variables before, see 'man ccache' for more details
+```
+
  - Execute `uname -r` inside a kernel recompiled in the current directory and
    send the output to cowsay on the host:
 ```