Perl Program to Bisect for Build-Time Warnings

• Running make at any given commit may emit warnings from more than one category

• So we'll need to do before/after comparisons of sets of warnings

  • Let's call these before/after comparisons: transitions

• A Perl program to identify transitions:

        perl warnings-transitions.pl \
          --git_checkout_dir=/tmp/perl2 \
          --workdir=/tmp/testing/clang" \
          --first=1f6c9461cb3775550f70cd0c579d874dc80c5038 \
          --last=9d9546e0faa646b5770bb5111bf61259779b0fd7 \
          --compiler=clang60 \
          --configure_command='sh ./Configure -des -Dusedevel -Dcc=clang60 -Duseithreads Doptimize="-O2 -pipe -fstack-protector -fno-strict-aliasing" 1>/dev/null 2>&1' \
          --pattern_sought="intrpvar.h:_:_: warning: 'Perl_sv_nosharing' is deprecated [Wdeprecated-declarations]"