<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/64835>64835</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            -print-changed=cdiff does not work on macOS 13
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          winocm
      </td>
    </tr>
</table>

<pre>
    I was trying to debug an ISel related bug when I noticed that "-print-changed=cdiff" is now completely broken on macOS 13. It used to work in previous versions of the OS as diff(1) was based on GNU diff, but it seems like macOS 13 includes a version of diff(1) based on FreeBSD. As such, this ends up happening:

```
*** IR Dump After Lazy Machine Block Frequency Analysis (lazy-machine-block-freq) on main omitted because no change ***
*** IR Dump After Machine Optimization Remark Emitter (machine-opt-remark-emitter) on main omitted because no change ***
*** IR Dump After Prologue/Epilogue Insertion & Frame Finalization (prologepilog) on main ***
diff: unrecognized option `--old-line-format=\033[31m-%l\033[0m
'
usage: diff [-aBbdilpTtw] [-c | -e | -f | -n | -q | -u] [--ignore-case]
            [--no-ignore-case] [--normal] [--strip-trailing-cr] [--tabsize]
            [-I pattern] [-F pattern] [-L label] file1 file2
       diff [-aBbdilpTtw] [-I pattern] [-L label] [--ignore-case]
            [--no-ignore-case] [--normal] [--strip-trailing-cr] [--tabsize]
            [-F pattern] -C number file1 file2
       diff [-aBbdiltw] [-I pattern] [--ignore-case] [--no-ignore-case]
            [--normal] [--strip-trailing-cr] [--tabsize] -D string file1 file2
       diff [-aBbdilpTtw] [-I pattern] [-L label] [--ignore-case]
            [--no-ignore-case] [--normal] [--tabsize] [--strip-trailing-cr]
            [-F pattern] -U number file1 file2
       diff [-aBbdilNPprsTtw] [-c | -e | -f | -n | -q | -u] [--ignore-case]
            [--no-ignore-case] [--normal] [--tabsize] [-I pattern] [-L label]
            [-F pattern] [-S name] [-X file] [-x pattern] dir1 dir2
       diff [-aBbditwW] [--expand-tabs] [--ignore-all-blanks]
            [--ignore-blank-lines] [--ignore-case] [--minimal]
            [--no-ignore-file-name-case] [--strip-trailing-cr]
            [--suppress-common-lines] [--tabsize] [--text] [--width]
            -y | --side-by-side file1 file2
 diff [--help] [--version]
*** IR Dump After Post-RA pseudo instruction expansion pass (postrapseudos) on main ***
diff: unrecognized option `--old-line-format=\033[31m-%l\033[0m
'
usage: diff [-aBbdilpTtw] [-c | -e | -f | -n | -q | -u] [--ignore-case]
            [--no-ignore-case] [--normal] [--strip-trailing-cr] [--tabsize]
            [-I pattern] [-F pattern] [-L label] file1 file2
       diff [-aBbdilpTtw] [-I pattern] [-L label] [--ignore-case]
            [--no-ignore-case] [--normal] [--strip-trailing-cr] [--tabsize]
            [-F pattern] -C number file1 file2
       diff [-aBbdiltw] [-I pattern] [--ignore-case] [--no-ignore-case]
            [--normal] [--strip-trailing-cr] [--tabsize] -D string file1 file2
       diff [-aBbdilpTtw] [-I pattern] [-L label] [--ignore-case]
            [--no-ignore-case] [--normal] [--tabsize] [--strip-trailing-cr]
            [-F pattern] -U number file1 file2
       diff [-aBbdilNPprsTtw] [-c | -e | -f | -n | -q | -u] [--ignore-case]
            [--no-ignore-case] [--normal] [--tabsize] [-I pattern] [-L label]
            [-F pattern] [-S name] [-X file] [-x pattern] dir1 dir2
       diff [-aBbditwW] [--expand-tabs] [--ignore-all-blanks]
            [--ignore-blank-lines] [--ignore-case] [--minimal]
            [--no-ignore-file-name-case] [--strip-trailing-cr]
            [--suppress-common-lines] [--tabsize] [--text] [--width]
            -y | --side-by-side file1 file2
 diff [--help] [--version]
```

This makes debugging (M)IR passes rather difficult. The version of diff(1) does accept the `diff --changed-group-format=` argument though, so replacing the system diff invocation inside `llvm/lib/IR/PrintPasses.cpp` should suffice.

</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzsWF1v2zoS_TX0y4CGTEWO_eCHJK4XBvoRJC12XylqLHFNkSw_4jq_fkEq9jpuk5sC96HATWCIEjk8c-aMlJGGey9bjbgg1TWpliMeQ2fcYie1Ef2oNs1-sYYd9xDcXuoWgoEG69gC17C-RwUOFQ_YQJrbdahhDdoEKbCB0PEAhDFqndSBio7rFhtSLkUjNxvCGEgP2uxAmN4qDKj2UDuzRQ1GQ8_Fl3uYlGNYB4g-4RnYGbcFqcE6fJAmenhA56XRHswGQofw5R64hwF_NiFsnsnXPO03Gv71-dvT4g3UMYAM4BF7D0pu8egSpBYqNuiBHxwk_FPUI-LKIV7fL8dw5cFH0SXk0EkPqBsP0ULHrUUtdUvKK1IsSXE4Toun33DJnn6wvoNl7C1cbQI6-Mgf9_CJi05qhGtlxDa5_B5Riz1caa72XnogbKb44572gyGtkyHdOPyeyGY1pQbTy5BzhYJHj6ANDEmBo_fXyRx4fLFB9vKRh6TMHfbcbeFDBneJyoGFsYG6vEpxWP1b2dw6o0wbkbDVByvzKay1R5dpETaFleM9wkpqrg5sCZvZvA_zllNCZ25zussriNqhMK2WjynjdkCZFpQa1VCV4twY1_NAyiWpboqyJNV1OekpYZU6ThT9IZbL4SR63mKCT26AVNeUX9eNVPZr2JFqmWcEkMsboDgMm2HQw_B9GOLBlspWG4dUcI-kWg5O4OQvG2lzZneYdj1Xx0sfnLQ0OC6V1C0V7rgSeO3l48sO1mB5yrM-7FidT3wExWvMvjZS4SQf2TO0VxT5Cf8E7s9R4VnQ9AZ07Gt0b433lWhfoP3WqH87PKBLSHa6_dOTdcL5xejekqxvv5msz7fW-T_gkT2L_xXp36BCmrgHzfsj3n-yEoerH6fGjXSTdHhNprD795Ep_rBcN5nwuRBcKVorrrf-ZTmeTLNZ_u_7E8ozmXqp5aDTX8qbIqQp6OcIb7-TqI_WOvSeCtP3Rp_RO79FA_4Ix4udbEL3S2S6H24b6mWDtN7n8Re351Fx2qGyR-Cn95cj9IvF1PhA767AeoyNAal9cFHkYpczll-CLPf5XcMaHxwfTP17CX0voe8l9L2EvpfQ9xL6zyihZ1_u-fg1ffP3fIt-aJC06YknbPaJsPn6LldO9OB46NBlR1JEFcbwtcOXegyNQQ9cCLQh9zbItMgM6aGVQltnoj2pndMCuGtjjzrtMLHN7QhvwKFVXOQGTofg9z5gP4Qr9YMRw6ex1FkXMi2UeugJWylZE7Za3xG2unVSh9scxFhYmzz5zkTVgI8pFhwPMoyaRdnMyzkf4WIynbNqwibFdNQtZnXd4EUx2cwvq8vLpplXk_mMXzacl5vL2cV8JBesYGUxY0UxnVTFdIyTarIRjZhtKoai5uSiwJ5LNU7sxsa1I-l9xMX0YlZWo_xs-tzGYkzjDvIiYYxUy5FbpD20jq0nF4WSPvj_owQZFC5-3aQacqBNGDpPJ22pUXRq0YVgPSmvCFsRtmpl6GI9FiZr9yRh8mud-S-KQNgqk_KErTLp_wUAAP__aO62xw">