[GitHub] [trafficserver] bneradt commented on issue #8934: Initial `clang-format` target invocation causes many files to be rebuilt

[GitBox <gi...@apache.org>]

bneradt commented on issue #8934:
URL: https://github.com/apache/trafficserver/issues/8934#issuecomment-1171571612

   @bryancall thought of using `-mmin` from find to detect what files are changing:
   
   ```
   # Clone, autoreconf, make.
   # Wait more than 5 minutes.
   
   # Now, find all the files modified in the last 5 minutes in the repo:
   find . -mmin -5
   # Should show nothing.
   
   # Now run the clang-format target, followed by the above find command:
   make -j5 clang-format && echo -------------------- && find . -mmin -5
   # ...
   ./plugins/certifier/certifier.cc
   make[1]: Leaving directory '/home/bneradt/src/ts_asf_master_fix_clang_format_make_target'
   --------------------
   ./.git
   ./.git/fmt
   ./.git/fmt/20200514
   ./.git/fmt/20200514/clang-format-20200514.tar.bz2
   ./.git/fmt/20200514/sha1
   ./include
   ./include/ink_autoconf.h.in
   ./include/ink_autoconf.h
   ```
   
   The `.git/fmt` directory changes are simply the changes to install clang-format. That's not interesting. But the fact that clang-format is modifying `ink_autoconf.h.in` and `ink_autoconf.h` is interesting. I'm not sure why that file is being modified despite making no changes.
   


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