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@dscho dscho commented Mar 25, 2025

Git for Windows still carries mimalloc v2.1.2, which is almost 2 years old. Let's upgrade.

dscho added 8 commits March 25, 2025 13:29
Now that Git is a bit stricter when compiling its own source, we need to
exempt mimalloc a bit more.

Signed-off-by: Johannes Schindelin <[email protected]>
Instead of trying to "fix" whitespace issues in mimalloc's source,
thereby making it unnecessarily complicated to keep the vendored-in
mimalloc sources in sync, let's just prevent Git from trying to enforce
its coding style rules on said vendored-in source files.

Signed-off-by: Johannes Schindelin <[email protected]>
In preparation for upgrading to a newer mimalloc version; This patch
will not be needed anymore, as it has been implemented in a slightly
different form in upstream mimalloc: 3e1d800e (potential fix for windows
static linking with thread creation in dll's, 2022-11-07).

Signed-off-by: Johannes Schindelin <[email protected]>
In preparation for upgrading to a newer mimalloc version.

Signed-off-by: Johannes Schindelin <[email protected]>
In preparation for upgrading to a newer mimalloc version.

Signed-off-by: Johannes Schindelin <[email protected]>
Update to newer mimalloc versions like this:

  update_mimalloc ()
  {
      test $# = 1 || {
          echo "Need a mimalloc version" 1>&2;
          return 1
      };
      for oneline in 'mimalloc: adjust for building inside Git' 'Import the source code of mimalloc';
      do
          git revert -n HEAD^{/^"$oneline"} && git checkout HEAD -- Makefile && git commit -sm "Temporarily revert \"$oneline\"" -m 'In preparation for upgrading to a newer mimalloc version.' || return 1;
      done;
      for file in $(git show --format='%n' --name-only --diff-filter=A HEAD^{/^"Import the source code of mimalloc "}) compat/mimalloc/arena-abandon.c compat/mimalloc/free.c compat/mimalloc/libc.c compat/mimalloc/prim/prim.c compat/mimalloc/mimalloc-stats.h;
      do
          file2=${file#compat/mimalloc/};
          case "$file2" in
              segment-cache.c)
                  : no longer needed;
                  continue
              ;;
              bitmap.h | *.c)
                  file2=src/$file2
              ;;
              *.h)
                  file2=include/$file2
              ;;
          esac;
          mkdir -p "${file%/*}" && git -C /usr/src/mimalloc/ show "$1":$file2 > "$file" && git add "$file" || {
              echo "Failed: $file2 -> $file" 1>&2;
              return 1
          };
      done;
      conv_sed='sed -n "/^ *eval/d;/      /p"' && git commit -sm "Import the source code of mimalloc $1" -m "Update to newer mimalloc versions like this:" -m "$(set | sed -n '/^update_mimalloc *() *$/,/^}/{s/^./  &/;p}')" -m '  update_mimalloc $MIMALLOC_VERSION' -m 'For convenience, you can set `MIMALLOC_VERSION` and then run:' -m '  eval "$(git show -s <this-commit> | '"$conv_sed"')"' || return 1;
      git cherry-pick HEAD^{/^'mimalloc: adjust for building inside Git'} || return 1
  }

  update_mimalloc $MIMALLOC_VERSION

For convenience, you can set `MIMALLOC_VERSION` and then run:

  eval "$(git show -s <this-commit> | sed -n "/^ *eval/d;/      /p")"

Signed-off-by: Johannes Schindelin <[email protected]>
We want to compile mimalloc's source code as part of Git, rather than
requiring the code to be built as an external library: mimalloc uses a
CMake-based build, which is not necessarily easy to integrate into the
flavors of Git for Windows (which will be the main benefitting port).

Signed-off-by: Johannes Schindelin <[email protected]>
Adjust the `Makefile` part for mimalloc v2.2.2.

Signed-off-by: Johannes Schindelin <[email protected]>
@dscho dscho self-assigned this Mar 25, 2025
@dscho dscho requested review from mjcheetham and rimrul March 25, 2025 12:36
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