On 25/06/2019 00:28, Malfettone, Kris via ccache wrote:
> So what I seem to be observing is only when I do a ninja -t clean or make
> clean. This removes all of my generated files (.h and .cpp files) and of
> course the normal build outputs. A subsequent run is then mostly cache
> misses. If I say manually do a rm $(find -name "*.o") then I get a 100%
> cache hit rate. I had assumed it was due to the fact that the generated
> files would have a newer mtime and ctime. My assumption must be wrong.
TTBOMK ccache ignores mtime/ctime/... (as make/ninja/... use that anyway
before) but only the preprocessed content matters.
IIUC, the `make clean` removes all *.o and all generated .h/.c/.hpp/.cpp
files.
The rm $(find -name "*.o") removes only *.o.
So the analysis above is at least incomplete.
Are you really sure the newly generated .h/.c/.hpp/.cpp files are
identical (enough)?
No static variables or expanded preprocessor #defines with the build
date+time or similar in there?
[ Fullquote deleted ]
MfG,
Bernd
--
Bernd Petrovitsch Email : be...@petrovitsch.priv.at
LUGA : http://www.luga.at
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