On Mon, May 20, 2019 at 10:16:26AM +0200, Richard Biener wrote:
> There's not many details there but I always thought that the
> "interesting" parts of the GCC history (official branches and trunk)
> do _not_ contain merge commits so the GCC history forms a tree
> rather than a DAG.  (I'm not sure if there's an easy way to verify
> whether there are any merge commits on a specific branch)

Some people do merge commits to release branches, or even to trunk.
I see svn:mergeinfo property e.g. on the following branches:
gcc-4.4 /trunk:155835,156042
gcc-4.7 
/trunk:185428,186391,186587,187608,187999,190407,190800,191014,197180,197284,206124-206126
gcc-4.8 /:197284 
/trunk:197180,197284,197677,197951,202766,204547,206123-206126,206395,206628,207387,210668,211733,215049
gcc-4.9 /branches/gcc-5-branch:230092 
/trunk:210615,210668,211733,214798,215049,215136,215176
gcc-5 /trunk:222186,230397,231455,232818,241491,243528,243962,244001
gcc-6 /trunk:239173,239656,241491,243962,244001,249272
gcc-7 /branches/gcc-8-branch:262746-262747 
/trunk:249272,249411,250097,253187,253451,254099,254866,262104,262442,262744
gcc-8 /trunk:260603,262104,262221,262442,262744
Current trunk doesn't have svn:mergeinfo, but in the past I've removed it
several times.  I see e.g. r250835, r249115, r249050, r236795, r210113, ...

Would be nice if during the conversion we could say we want to ignore
svn:mergeinfo on some branches altogether.

        Jakub

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