C predefined macros: LP64 / _LP64 (and arch predefines) missing

• Type: bug (cpreproc), EASY WIN. Track C.
• Found: 2026-07-06 c-testsuite run.

Failing test

• 00212: prints "KO no LP defined." — expects __LP64__/_LP64 (x86-64) or the ILP32 equivalents per target.

Fix

cpreproc.inc predefined-macro table: per-target data model macros — x86-64/aarch64: __LP64__ _LP64; i386/arm32/riscv32/xtensa: __ILP32__ (gcc defines it on some 32-bit targets; minimum = LP64 pair on 64-bit). Check what's already predefined (__x86_64__ etc.) and align with gcc -dM.

Gate

Drop 00212.c from test/c-conformance/pxx.skip; runner green.

Log

• 2026-07-06 — resolved, commit 576ff6ca.