incremental = true causes 4-5x build time regression in generated rustc build times #52374
Description
I am running rm build/*/stage* -rf && ./x.py build src/libstd in two different situations: With incremental = true and with incremental = false. All the other settings in config.toml are commented out. This is using 1731f0a.
With incremental = false, the build step "Building stage1 std artifacts" takes 46s.
With incremental = true, the same step takes 4m 46s.
These are compiled using the stage0 compiler artifacts -- seems like those become way slower when incremental build is enabled?
(I am currently doing this experiment again just to be sure.)