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Add instructions for a working git-subtree

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Antoni Boucher 2023-02-28 17:39:01 -05:00
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@ -187,6 +187,17 @@ TODO(antoyo): but that's not what I remember I was doing.
* Build the stage2 compiler (`rustup toolchain link debug-current build/x86_64-unknown-linux-gnu/stage2`).
* Clean and rebuild the codegen with `debug-current` in the file `rust-toolchain`.
### How to install a forked git-subtree
Using git-subtree with `rustc` requires a patched git to make it work.
The PR that is needed is [here](https://github.com/gitgitgadget/git/pull/493).
Compile it and copy those files to `/usr/local/bin`:
```
git-commit-tree git-ls-tree git-merge-tree git-read-tree git-write-tree
git-diff-tree git-merge-subtree git-mktree git-worktree
```
### How to use [mem-trace](https://github.com/antoyo/mem-trace)
`rustc` needs to be built without `jemalloc` so that `mem-trace` can overload `malloc` since `jemalloc` is linked statically, so a `LD_PRELOAD`-ed library won't a chance to intercept the calls to `malloc`.