verify_compiler() in scripts/env.sh ran `file` on the clang path and
grepped for arm64/universal. Nix's clang is a bash wrapper script, so
`file` reports "ASCII text executable" and the check falsely concluded
"x86_64 only", aborting before any compile. Replace it with a capability
probe: compile + link a trivial program for the target -arch and trust
the result — correct for wrapper scripts (Nix, ccache) and cross-compilers.
Make arch targeting explicit and toolchain-agnostic: export
ARCHFLAGS="-arch <arch>" from env.sh and fold it into CC/CXX in
Makefile.cbm via `override`, so it reaches every compile and link
(including the vendored objects) and survives a command-line CC=
override. This replaces the `arch -<arch> make` prefix, which cannot
work with Nix's fixed-target clang. Drop the now-redundant ARCH_PREFIX
from build/test/lint/repro.
Refs #705.
Signed-off-by: Kris Williams <115474+kriswill@users.noreply.github.com>
Kris Williams
1aaa8297f3