On 2011-02-28 13:30, Mike Crowe wrote: >> When making relative pathnames try and do so both before and after >> calling realpath and pick the version that is the shortest. This helps >> if the build starts from a path that contains a symlink and a Makefile >> somewhere decides to use realpath to generate absolute paths. On Sun, Mar 13, 2011 at 11:20:07PM +0100, Joel Rosdahl wrote: > First I thought that your use case is this: There's a file named > /dir1/src/file.c, /dir2 is a symlink to /dir1 and CCACHE_BASEDIR=/dir2. > The Makefile in /dir1/src runs "gcc -c $(realdir file.c) -o file.o", so > when invoked in /dir2/src, make will execute "gcc -c /dir1/src/file.c -o > file.o", and ccache will thus not detect that /dir1/src/file.c should be > rewritten since it doesn't match CCACHE_BASEDIR.
Well, that certainly is a problem that I would also like to resolve but you are correct in saying that the patch does not address it. I ended up deciding that the only way to solve it would be to invent CCACHE_BASEDIRS to support multiple base directories. I have a patch in development that does this. > But your patch doesn't address that problem, so that's not the use case. > Let's try again. There's a file named /dir/1/src/file.c, /dir/2 is a > symlink to /dir/1 and CCACHE_BASEDIR=/dir. The Makefile in /dir/1/src > runs "gcc -c $(realdir file.c) -o file.o", so when invoked in > /dir/2/src, make will execute "gcc -c /dir/1/src/file.c -o file.o" and > ccache will rewrite /dir/1/src/file.c to ../../2/src/file.c. With your > patch, /dir/1/src/file.c will instead be rewritten to file.c, thus in a > sense normalizing the path so that there will be a cache hit if you > later build in /dir/1/src. Is that the use case? Yes, this is the use case that is addressed by the patch. The reason it is a problem for me is that we share a ccache among multiple users and the rewritten path ends up being unique for each user (without the patch.) I'm open to suggestions if you think there is a better way to fix either or both problems. Thanks. Mike. _______________________________________________ ccache mailing list firstname.lastname@example.org https://lists.samba.org/mailman/listinfo/ccache