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CI: Add native Windows arm64 job/package #4931

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@kinke kinke commented May 15, 2025

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Revert "CI: Revert to LDC-LLVM v19.1.7 due to remaining dynamic-compi…
9e8881a 
…le regressions with LLVM 20"

This reverts commit ad4a35a.
@kinke kinke force-pushed the gha_woa64 branch 7 times, most recently from bffad2e to ff026ee Compare May 16, 2025 00:46
@kinke
Overcome longdouble_soft problem on WoA64 hosts
a005241 
That 'soft' implementation (of an 80-bit x87 value used for compile-time
reals on Windows MSVC x86[_64] hosts, if their native `real` is a 64-bit
double with an LDC host compiler) is still based on x87 inline asm,
so cannot be used in a WoA64 compiler binary.

So use a 64-bit native `real` for compile-time reals on WoA64 hosts.
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kinke commented May 16, 2025

Current blocker: ldc2.exe doesn't link, 3 misaligned relocations apparently. With -link-internally:

lld-link: error: misaligned ldr/str offset

lld-link: error: misaligned ldr/str offset

lld-link: error: misaligned ldr/str offset

Error: linking with LLD failed

Surprisingly better diagnostics with the MS linker:

ldc.lib(main.cpp.obj) : error LNK2048: relocation PAGEOFFSET_12L targeting '?global@@3UGlobal@@A' (0774A1B8) is invalid for the instruction (3D800100 at RVA 0023822C) at section 0x16 offset 0xAB0, due to bad alignment of offset to target (1B8); expected to be 16 bytes aligned
ldc.lib(main.cpp.obj) : error LNK2048: relocation PAGEOFFSET_12L targeting '?global@@3UGlobal@@A' (0774A1B8) is invalid for the instruction (3D811500 at RVA 0023850C) at section 0x16 offset 0xD90, due to bad alignment of offset to target (608); expected to be 16 bytes aligned
ldc.lib(main.cpp.obj) : error LNK2048: relocation PAGEOFFSET_12L targeting '?global@@3UGlobal@@A' (0774A1B8) is invalid for the instruction (3D80E900 at RVA 0023855C) at section 0x16 offset 0xDE0, due to bad alignment of offset to target (558); expected to be 16 bytes aligned
LINK : fatal error LNK1165: link failed because of fixup errors

I.e., coming from C++, and wrt. the Global global variable (defined in D). I wasn't really expecting anything with an alignment of 16 on WoA64 here in that struct (real_t is a 64-bit double).

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