Claim: Glint's build and x86_64 boots work on x86-1's BusyBox BQ2 system, where clang is 18.1.7, not the old Alpine host's 21. Four things had relied on that host: - tools/zephyr/flags.cr defines CONFIG_MINIMAL_LIBC. Zephyr's minimal stdint.h needs __UINT64_C, which clang predefines only from 20.1; below that, Zephyr's toolchain/llvm.h supplies it under this symbol. - QEMU's compile and test flags now use its bundled linux-headers with -isystem, as its meson.build (line 790) does. Without it, include/system/host_iommu_device.h needs a newer linux/iommufd.h than this system's. - GLib links -liconv where libiconv is installed, because GNU's iconv.h renames iconv_open to libiconv_open. The QEMU specs' library lists allow it. - tools/c_archive_build.cr fetches with curl, because busybox wget gets "Connection reset by peer" on every HTTPS URL tried here. spec/uboot/uboot_x86_64_spec.cr looks for "clang version", not "Alpine clang version".

Passage: PLAN's Build constraints: the BQ2 toolset is enough to build the Glint kernel.

Demonstration: - QEMU 11.1.2 for x86_64 and aarch64, and U-Boot for x86_64, rebuild from pinned sources. bin/glint-build x86_64 gives BOOTX64.EFI at 172,544 bytes, the size 3.5 recorded. - bin/glint-run x86_64 passes guest_space (native, and refused hosted), the heap native and hosted, cat, fault, fault "write" (native, and refused hosted) and overflow. - crystal spec: 699 examples, 33 failures, 2 errors, 0 pending; TMPDIR left empty. All 35 trace to this system's X86-only LLVM, which can't target aarch64. 8 of them are x86_64 or general specs that stop at glint-build all or at the aarch64 half of a cross-compile. Before these fixes' spec changes it was 38 and 2. - crystal tool format --check passes.

Not shown: aarch64. Nothing here could be built or booted for it, including the CONFIG_MINIMAL_LIBC change on aarch64 past the compiler's target error. bin/glint-qemu needs LD_LIBRARY_PATH=/usr/lib64 here, because libxml2 is in a directory the loader doesn't search; that isn't fixed in this check-in.

Size: 18 lines added and 13 removed, no new files.

Claim: Glint's build and x86_64 boots work on x86-1's BusyBox BQ2 system, where clang is 18.1.7, not the old Alpine host's 21. Four things had relied on that host: - tools/zephyr/flags.cr defines CONFIG_MINIMAL_LIBC. Zephyr's minimal stdint.h needs __UINT64_C, which clang predefines only from 20.1; below that, Zephyr's toolchain/llvm.h supplies it under this symbol. - QEMU's compile and test flags now use its bundled linux-headers with -isystem, as its meson.build (line 790) does. Without it, include/system/host_iommu_device.h needs a newer linux/iommufd.h than this system's. - GLib links -liconv where libiconv is installed, because GNU's iconv.h renames iconv_open to libiconv_open. The QEMU specs' library lists allow it. - tools/c_archive_build.cr fetches with curl, because busybox wget gets "Connection reset by peer" on every HTTPS URL tried here. spec/uboot/uboot_x86_64_spec.cr looks for "clang version", not "Alpine clang version".

Passage: PLAN's Build constraints: the BQ2 toolset is enough to build the Glint kernel.

Demonstration: - QEMU 11.1.2 for x86_64 and aarch64, and U-Boot for x86_64, rebuild from pinned sources. bin/glint-build x86_64 gives BOOTX64.EFI at 172,544 bytes, the size 3.5 recorded. - bin/glint-run x86_64 passes guest_space (native, and refused hosted), the heap native and hosted, cat, fault, fault "write" (native, and refused hosted) and overflow. - crystal spec: 699 examples, 33 failures, 2 errors, 0 pending; TMPDIR left empty. All 35 trace to this system's X86-only LLVM, which can't target aarch64. 7 of them are x86_64 or general specs that stop at glint-build all or at the aarch64 half of a cross-compile. Before these fixes' spec changes it was 38 and 2. - crystal tool format --check passes.

Not shown: aarch64. Nothing here could be built or booted for it, including the CONFIG_MINIMAL_LIBC change on aarch64 past the compiler's target error. bin/glint-qemu needs LD_LIBRARY_PATH=/usr/lib64 here, because libxml2 is in a directory the loader doesn't search; that isn't fixed in this check-in.

Size: 18 lines added and 13 removed, no new files.