build-system: introduce MODULE_DEFS_NEEDED list

[maribu]

Contribution description

• do not unconditionally expose every module foo via CFLAGS += -DMODULE_FOO
  • instead, only expose listed in MODULE_DEFS_NEEDED
  • do so globally when listed in Makefile.include
  • do so locally (only C files within the module) when listed in Makefile
• modules listed in MODULE_DEFS_NEEDED will be added with CFLAGS += -DMODULE_FOO=1 if used, or CFLAGS += -DMODULE_FOO=0 if not used
  • This makes IS_USED() pointless. In fact, it will even hide the fact that a module is not listed in MODULE_DEFS_NEEDED but tested for
  • dreprecate IS_USED() and define it as #define IS_USED(x) x to ensure missing MODULE_DEFS_NEEDED declarations cause compilation errors

Testing procedure

Everything builds as before, same binaries as before.

Issues/PRs references

None

Declaration of AI-Tools / LLMs usage:

AI-Tools / LLMs that were used are:

• a python script to modify Makefile and Makefile.include based on instances of MODULE_[A-Z0-9_]+ in *.c and *.h was mostly vibed
• otherwise none

[riot-ci]

Murdock results

❌ FAILED

4cda652 build-system: introduce MODULE_DEFS_NEEDED list

Success	Failures	Total	Runtime
413	499	10255	03m:35s

Build failures (21)

Application	Target	Toolchain	Runtime (s)	Worker
examples/networking/misc/benchmark_udp	native64	gnu	0.58	mobi5
tests/core/thread_float	msba2	gnu	0.85	mobi1
tests/core/thread_float	native32	gnu	0.85	mobi6
tests/core/thread_float	msb-430	gnu	0.77	mobi6
tests/core/thread_float	native64	gnu	0.98	mobi7
tests/core/thread_float	hifive1b	gnu	0.84	mobi5
tests/core/thread_float	native32	llvm	0.85	mobi1
tests/pkg/umorse	native64	gnu	1.24	mobi1
tests/pkg/umorse	msba2	gnu	0.75	mobi6
tests/pkg/umorse	native32	gnu	1.79	riot-ci
tests/pkg/umorse	native32	llvm	1.03	mobi6
tests/sys/cpp11_mutex	native32	gnu	0.82	mobi7
tests/sys/cpp11_mutex	native64	llvm	1.27	mobi5
tests/sys/cpp11_mutex	native64	gnu	1.81	mobi3
tests/sys/cpp11_mutex	msba2	gnu	1.22	mobi6
tests/sys/ztimer_ondemand_benchmark	native32	gnu	0.71	mobi5
tests/sys/ztimer_ondemand_benchmark	native64	gnu	0.46	mobi5
tests/sys/ztimer_ondemand_benchmark	native64	llvm	0.74	mobi6
tests/sys/ztimer_ondemand_benchmark	msb-430	gnu	1.08	mobi3
tests/sys/ztimer_ondemand_benchmark	native32	llvm	0.99	mobi3

and 479 more build failures...

Artifacts