[Bug 58039] New: [NOT A BUG] Wine's "bottles" optimization when using mingw64-gcc

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=58039

            Bug ID: 58039
           Summary: [NOT A BUG] Wine's "bottles" optimization when using
                    mingw64-gcc
           Product: Wine
           Version: 10.4
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: wineserver
          Assignee: wine-bugs(a)winehq.org
          Reporter: aros(a)gmx.com
      Distribution: ---

If you compile Wine i686 using GCC, a WINEPREFIX is populated with stubs and is
relatively small - around 37MB for Wine 10.0.

If you compile Wine using mingw-gcc along with --enable-archs=i386,x86_64, a
WINEPREFIX is populated with full fat binaries and libraries and takes over
650MB while most of the data _fully_ mirrors what Wine already
contains/installs systemwide in /usr/lib64/wine.

This becomes especially wasteful if you have multiple bottles/WINEPREFIX'es.

Could Wine let's say populate the WINEPREFIX with symlinks instead and only if
a Windows application attempts to overwrite them (not wine itself), they are
turned into real files? Even this case looks kinda outlandish (except DirectX)
since Windows has featured WinSxS since Vista (in XP in was optional) and files
under /Windows/system32 and /Windows/SysWoW64 are immutable.

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[Bug 58039] [NOT A BUG] Wine's "bottles" optimization when using mingw64-gcc

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=58039

--- Comment #1 from Artem S. Tashkinov <aros(a)gmx.com> ---
Of course I could use something like (courtesy of ChatGPT, not tested, use at
your own risk):

```Bash

#!/bin/bash

dirA="A"  # Set to your actual directories
dirB="B"

# Step 1: Find all files in B and store their hashes in an associative array
declare -A hashes
while IFS="  " read -r hash file; do
    hashes["$hash"]="$file"
done < <(find "$dirB" -type f -exec sha256sum {} +)

# Step 2: Find files in A, check for matching hashes, and replace with symlinks
find "$dirA" -type f -exec sha256sum {} + | while IFS="  " read -r hash fileA;
do
    if [[ -n "${hashes[$hash]}" ]]; then
        fileB="${hashes[$hash]}"
        absFileA=$(realpath "$fileA")
        absFileB=$(realpath "$fileB")

        if [ -f "$absFileA" ] && [ -f "$absFileB" ]; then
            rm "$absFileA"
            ln -s "$absFileB" "$absFileA"
            echo "Replaced $absFileA with symlink to $absFileB"
        fi
    fi
done
```

to replace files in WINEPREFIX'es with their original systemwide counterparts
but that needs to be done after every Wine update and this is just not nice.

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