Integrate LZ4 library, compress the ramdisk

lz4/build/make/README.md

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+# multiconf.make
+
+**multiconf.make** is a self-contained Makefile include that lets you build the **same targets under many different flag sets**—debug vs release, ASan vs UBSan, GCC vs Clang, etc.—without the usual “object-file soup.”
+It hashes every combination of `CC/CXX`, `CFLAGS/CXXFLAGS`, `CPPFLAGS`, `LDFLAGS` and `LDLIBS` into a **dedicated cache directory**, so objects compiled with one configuration are never reused by another. Swap flags, rebuild, swap back—previous objects are still there and never collide.
+
+---
+
+## Key Benefits
+
+| Why it matters | What multiconf.make does |
+| --- | --- |
+| **Isolated configs** | Stores objects into `cachedObjs/<hash>/`, one directory per unique flag set. |
+| **Fast switching** | Reusing an old config is instant—link only, no recompilation. |
+| **Header deps** | Edits to headers trigger only needed rebuilds. |
+| **One-liner targets** | Macros (`c_program`, `cxx_program`, …) hide all rule boilerplate. |
+| **Parallel-ready** | Safe with `make -j`, no duplicate compiles of shared sources. |
+
+---
+
+## Quick Start
+
+### 1 · List your sources
+
+```make
+C_SRCDIRS   := src src/cdeps    # all .c are in these directories
+CXX_SRCDIRS := src src/cxxdeps  # all .cpp are in these directories
+```
+
+### 2 · Add and include
+
+```make
+# root/Makefile
+include multiconf.make
+```
+
+### 3 · Declare targets
+
+```make
+app:
+$(eval $(call c_program,app,app.o obj1.o obj2.o))
+test:
+$(eval $(call cxx_program,test, test.o objcxx1.o objcxx2.o))
+```
+
+### 4 · Build any config you like
+
+```sh
+# Release with GCC
+make CFLAGS="-O3"
+
+# Debug with Clang + AddressSanitizer (new cache dir)
+make CC=clang CFLAGS="-g -O0 -fsanitize=address"
+
+# Switch back to GCC release (objects still valid, relink only)
+make CFLAGS="-O3"
+```
+
+Objects for each command live in different sub-folders; nothing overlaps.
+
+---
+
+## Additional capabilities
+
+| Command | Description |
+| --- | --- |
+| `make clean_cache` | Wipe **all** cached objects & deps (full rebuild next time) |
+| `V=1` | Show full compile/link commands |
+
+---