[ccache] Sharing ccache among different workspaces.

[Martin Pool]

Sorry, not sure then


On 5 May 2014 13:41, Sunny Jose <sunju_jose at yahoo.com> wrote:

> Hi Martin,
>
> Thanks for the response.
>
> Yes, all the various compilations produce the exact same binary output.
>
>   On Monday, May 5, 2014 6:38 AM, Martin Pool <mbp at sourcefrog.net> wrote:
>  Do the various compilations produce the exact same binary output?
> There might be something in your tree that makes the output vary from one
> run to the next.
> On Apr 29, 2014 3:50 PM, "Sunny Jose" <sunju_jose at yahoo.com> wrote:
>
> Hi,
>
> I want to share the ccache built using one workspace to be utilized by
> another workspace, so that one copy of ccache data is used for compiling
> identical source code.
> E.x: 1) Created a workspace (home/user/source_code1). 2) synced the code
> here from the server. 3) Compiled the Code with USE_CCACHE=1
> The above will build my ccache. Now I do the following
> Case 1: 1) Created a workspace (home/user/source_code2). 2) synced
> identical source code here from the server. 3) Did the same compilation as
> I did in the earlier workspace.
> Case 2: 1) Delete workspace home/user/source_code1 2) Re-create the
> earlier workspace (home/user/source_code1). 2) Re-synced the code here from
> the server. 3) Compiled the Code with USE_CCACHE=1
> I want source_code2 compilation to use the ccache built from source_code1
> and when I delete and re-create the same workspace, I need the compilation
> to happen with the ccache already built. Any pointers to achieve the same
> are welcome!
> The result that I see now in both the above cases is though ccache is
> built it is never used or there are no hits in the ccache, it keeps on
> getting built up whenever a new workspace is used, If I just clean the
> build and re-compile in the same workspace without deleting any earlier
> source code(home/user/source_code1), then ccache compilation jumps in and
> there are hits which help in reducing the build time.
> Any idea why I do not see any ccache hits whenever a brand new workspace
> is used?
> I always have the "ccache miss" incremented rather than the "cache hit
> (direct) , or , cache hit (preprocessed) ". Also the "cache hit (direct)"
> is always 0.
>
> I have set the following variables.
>
> CCACHE_BASEDIR= /home/user
> USE_CCACHE=1
> CCACHE_DIR=/home/user/ccache
> CCACHE_SLOPPINESS=time_macros,file_macro
>
>
> Kindly please let me know if I'm missing something obvious here.
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>
>
>


-- 
Martin