Rustbuild: No rule to make "rust/src/liballoc_jemalloc/../jemalloc/include/jemalloc/internal/ph.h"

[est31]

I've recently done a source update of rustc, and have been greeted by an error like "No rule to make target src/liballoc_jemalloc/../jemalloc/include/jemalloc/internal/ph.h, needed by src/jemalloc.o".

I could work around the issue by removing the build/x86_64-unknown-linux-gnu/native/jemalloc/ directory and rebuilding, but its a build system issue if that is not done for me, or if the makefile is not regenerated.

[est31]

Hmm seems this was caused by #42566 ...

[tirr-c]

I encountered the same issue, and rebuilding after ./x.py clean solved it.

[petrochenkov]

I encountered this as well, It's some jemalloc build system issue - it can't reconfigure correctly in a dirty build directory if some huge changes like #41861 or #42566 happen.
The minimal fix is to delete the jemalloc build directory build\<target>\native\jemalloc and build again.

[est31]

@petrochenkov can this be kept open for a while to prevent dupes from being filed? most people only search for open bugs.

[est31]

Okay, it has been open long enough.