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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**. For example debug vs release, ASan vs UBSan, GCC vs Clang.
+Each different set of flags generates object files into its own **dedicated cache directory**, so objects compiled with one configuration are never reused by another.
+Object files from previous configurations are preserved, so swapping back to a previous configuration only requires compiling objects which have actually changed.
+
+---
+
+## Benefits at a glance
+
+| Benefit | 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. |
+| **Controlled verbosity** | Default only lists objects, while `V=1` display full commands. |
+| **`clean` included** | `make clean` deletes all objects, binaries and links. |
+
+---
+
+## 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 $(call c_program,app,app.o cdeps/obj.o))
+
+test:
+$(eval $(call cxx_program,test, test.o cxxdeps/objcxx.o))
+
+lib.a:
+$(eval $(call static_library,lib.a, lib.o cdeps/obj.o))
+
+lib.so:
+$(eval $(call c_dynamic_library,lib.so, lib.o cdeps/obj.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.
+
+---
+