C crtl: long-double math (ldexpl, ...) missing — blocks tcc

• Type: bug/feature (crtl library breadth). Track B (lib/crtl), surfaced by C frontend.
• Found: 2026-07-07, tcc bring-up (libtcc.c:12370).

Symptom

call to undeclared function: ldexpl. tcc parses its long-double float constants via ldexpl/strtold etc. lib/crtl has ldexp (double) but not the l (long-double) variants.

Question first

Does pxx model long double distinctly, or map it to double? Check ParseCDeclType for long double. If long double == double in pxx, the fix is a thin alias layer: ldexpl->ldexp, strtold->strtod, frexpl->frexp, etc. in lib/crtl (a header + sibling .c, C-mode). If pxx needs real 80-bit long double, that's a much larger arc (x87 extended precision) — file separately; tcc would then need its float constant handling checked against gcc anyway.

Fix (assuming long double == double)

Add the *l long-double math aliases to lib/crtl (mirror the existing math.c crtl shim); each just forwards to the double version. Enough to unblock tcc's parse; correctness of tcc's emitted float constants is a later check.

Gate

tcc libtcc.c advances past :12370; a small long-double-math test compiles/links.

RESOLVED 2026-07-07 (Track B) — long double == double, thin aliases

Confirmed pxx maps long double to double (sizeof both 8, 3.5L round-trips). tcc needs only ldexpl + strtold; added as double-forwarding aliases: lib/crtl/include/math.h + src/math.c ldexpl(x,e){return ldexp(x,e);}; stdlib.h + src/stdlib.c strtold(s,e){return strtod(s,e);}. Verified (ldexpl(1.5,3)=12, strtold parses 2.5). lua still green. tcc advances past :12370.