7zip @24.09: fatal error: implicit declaration of function 'vsha512hq_u64' is invalid in C99 [-Wimplicit-function-declaration]

[stevehav (Steve Havelka)]

On an apple silicon device, running MacOS 11.7.10, 7zip fails to build, affixing the log contents as an attached file because the log itself is too large to include in the ticket.

[stevehav (Steve Havelka)]

The log file of the failed build

[jmroot (Joshua Root)]

:info:build ../../../../C/Sha512Opt.c:323:5: fatal error: implicit declaration of function 'vsha512hq_u64' is invalid in C99 [-Wimplicit-function-declaration]
:info:build     R16 ( K, NN )
:info:build     ^

[aeiouaeiouaeiouaeiouaeiouaeiou]

Googling for similar issues, I found an ​interesting comment in the Mbed TLS repository:

/*
 * Best performance comes from most recent compilers, with intrinsics and -O3.
 * Must compile with -march=armv8.2-a+sha3, but we can't detect armv8.2-a, and
 * can't always detect __ARM_FEATURE_SHA512 (notably clang 7-12).
 *
 * GCC < 8 won't work at all (lacks the sha512 instructions)
 * GCC >= 8 uses intrinsics, sets __ARM_FEATURE_SHA512
 *
 * Clang < 7 won't work at all (lacks the sha512 instructions)
 * Clang 7-12 don't have intrinsics (but we work around that with inline
 *            assembler) or __ARM_FEATURE_SHA512
 * Clang == 13.0.0 same as clang 12 (only seen on macOS)
 * Clang >= 13.0.1 has __ARM_FEATURE_SHA512 and intrinsics
 */

Big Sur unlike buildbots uses Clang version 1300 => 13.0.0 by default. I don't want to block newer versions as the problem occurs only on ARM64.

[ryandesign (Ryan Carsten Schmidt)]

You may want to report this problem to the developers of 7zip so they can fix it.