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The DLL was compiled directly from sources, without the objects' cache keyed by flags : after make lib-nomt, make lib-mt kept the DLL without threads (and conversely). It now uses c_dynamic_library(), as the Unix shared library, with the multi-threading flags in the cache key ; the resource object is an additional dependency. The import library is the same for both variants (same exports). With BUILD_SHARED=no, liblz4 builds nothing, as before. Checked with mingw-w64 : MULTITHREAD=0 / 1 / back to 1 (cached) switch the DLL's thread imports ; a program linked to the multi-threaded DLL compresses with nbWorkers=4 under wine.
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
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
# root/Makefile
include multiconf.make
3 · Declare targets
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
# 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 |