Created attachment 62319 [details] Drop dolt Dolt only made a noticable difference with old libtool versions. With libtool 2.2.10, the speed difference is < 5% in "make -j8" builds I tried. "time make -j8" output of 3 runs before the patch and 3 runs with this patch on an Intel i7-860 with 8 GB of RAM: With dolt: real 8m48.871s user 63m5.526s sys 4m14.357s real 8m43.389s user 63m14.902s sys 4m15.006s real 8m44.677s user 63m15.848s sys 4m14.686s Without dolt: real 9m8.344s user 64m31.824s sys 4m24.658s real 9m8.492s user 64m30.652s sys 4m24.363s real 9m6.837s user 64m32.277s sys 4m24.979s The fabulous speed increase in the email linked from https://bugs.webkit.org/show_bug.cgi?id=19395#c3 were against libtool 1.5 that was already obsolete of the time of that email.
Wrong link, I wanted to point at https://bugs.webkit.org/show_bug.cgi?id=16891#c3
Comment on attachment 62319 [details] Drop dolt I recently tried this also, and got similar numbers to yours. We still fill the difference warrants keeping dolt for the moment, we'll get rid of it when the build times without dolt are equal or better than those using a recent libtool.
Not only did we drop dolt, we dropped both libtool and autotools completely.