Add make2compdb, JSON Compilation Database tool

Closes #251.

Dockerfile

@@ -1139,6 +1139,10 @@ RUN printf "id ICON \"$PREFIX/src/w64devkit.ico\"" >w64devkit.rc \
  && $ARCH-gcc -DEXE=../share/nsis/bin/makensis.exe -DCMD=makensis \
         -Oz -fno-asynchronous-unwind-tables -Wl,--gc-sections -s -nostdlib \
         -o $PREFIX/bin/makensis.exe $PREFIX/src/alias.c -lkernel32 \
+ && $ARCH-gcc \
+        -Oz -fno-asynchronous-unwind-tables -fno-builtin -Wl,--gc-sections \
+        -s -nostdlib -o $PREFIX/bin/make2compdb.exe $PREFIX/src/make2compdb.c \
+        -lkernel32 -lshell32 -lmemory \
  && sed -i s/'\<ARCH\>'/$ARCH/g $PREFIX/etc/profile \
  && mkdir -p $PREFIX/lib/pkgconfig \
  && cp /dl/mingw/COPYING.MinGW-w64-runtime/COPYING.MinGW-w64-runtime.txt \

README.md

@@ -201,6 +201,12 @@ libraries have paths containing spaces.
   to examine GCC-incompatible binaries, potentially to make some use of
   them anyway.
 
+* [`make2compdb`][make2compdb]: generates a `compile_commands.json` JSON
+  Compilation Database from `make` build system output. Use `-Bwn` and
+  pipe the the output of `make` into this program:
+
+      $ make -Bwn | make2compdb >compile_commands.json
+
 * `recycle`: sends files and folders straight to the recycle bin. Faster
   than `rm -rf` and reversible. Composes well with Storage Sense automatic
   delection of old Recycle Bin items.
@@ -271,6 +277,7 @@ binaries.
 [lic2]: https://sourceforge.net/p/mingw-w64/mingw-w64/ci/master/tree/mingw-w64-libraries/winpthreads/COPYING
 [llvm-mingw]: https://github.com/mstorsjo/llvm-mingw
 [make]: https://www.gnu.org/software/make/
+[make2compdb]: https://github.com/skeeto/w64devkit/issues/251
 [names]: https://learn.microsoft.com/en-us/cpp/build/reference/decorated-names
 [ninja]: https://ninja-build.org/
 [nsis]: https://nsis.sourceforge.io/