wehub-resource-sync
106 lines
4.5 KiB
Bash
Executable File
106 lines
4.5 KiB
Bash
Executable File
#!/usr/bin/env bash
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# env.sh — Shared environment detection for all build scripts.
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#
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# Sourced by test.sh, build.sh, lint.sh. Not meant to run standalone.
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#
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# Exports:
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# ARCH — target architecture (arm64 / x86_64)
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# ARCHFLAGS — "-arch <arch>" on macOS (target slice for clang/ld), empty elsewhere
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# NPROC — number of CPU cores
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# OS — darwin / linux / windows
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set -euo pipefail
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# ── Detect OS ──────────────────────────────────────────────────
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OS="$(uname -s | tr '[:upper:]' '[:lower:]')"
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case "$OS" in
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darwin) OS="darwin" ;;
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linux) OS="linux" ;;
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mingw*|msys*|cygwin*) OS="windows" ;;
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*) OS="unknown" ;;
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esac
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# ── Detect / override architecture ─────────────────────────────
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# Default: native HARDWARE architecture (not Rosetta-translated).
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# On macOS under Rosetta, uname -m returns x86_64 even on Apple Silicon.
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# We use sysctl to detect the true hardware.
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HW_ARCH="$(uname -m)"
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if [[ "$(uname -s)" == "Darwin" ]] && sysctl -n hw.optional.arm64 2>/dev/null | grep -q 1; then
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HW_ARCH="arm64"
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fi
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case "$HW_ARCH" in
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aarch64|arm64) HW_ARCH="arm64" ;;
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x86_64|amd64) HW_ARCH="x86_64" ;;
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esac
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# CBM_ARCH env var or --arch flag override (parsed by calling script)
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ARCH="${CBM_ARCH:-$HW_ARCH}"
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# ── Target-architecture flags (macOS only) ─────────────────────
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# Select the target slice explicitly with clang/ld's -arch instead of
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# relaunching make under `arch -<arch>`. Explicit -arch is the only approach
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# that works across toolchains: a Nix/Homebrew clang wrapper has a fixed
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# target triple, so `arch -x86_64 make` would still emit native arm64. It also
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# lets host tools (node, codegen) keep running natively during a cross-build.
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# Makefile.cbm folds $(ARCHFLAGS) into CC/CXX so it reaches every compile and
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# link, including the vendored objects. Empty on Linux/Windows.
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ARCHFLAGS=""
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if [[ "$OS" == "darwin" ]]; then
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ARCHFLAGS="-arch ${ARCH}"
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fi
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export ARCHFLAGS
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# ── Detect parallelism ─────────────────────────────────────────
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NPROC=$(nproc 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null || echo 4)
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# ── Verify compiler can build for the target arch ──────────────
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# On macOS, PROBE actual capability instead of inspecting the compiler's own
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# Mach-O header. The driver is often a wrapper script (Nix, ccache, Homebrew)
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# or a clang that cross-compiles, so `file` on the binary says nothing about
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# what it can target — it just sees a shell script or a host-arch executable.
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# Compiling + linking a trivial program with -arch <target> is the truth.
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verify_compiler() {
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local compiler="$1"
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local bin
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bin="$(command -v "$compiler" 2>/dev/null || true)"
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if [[ -z "$bin" ]]; then
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echo "ERROR: compiler '$compiler' not found in PATH" >&2
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exit 1
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fi
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if [[ "$OS" == "darwin" ]]; then
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local probe_out
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probe_out="$(mktemp -t cbm-archprobe.XXXXXX)"
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if ! printf 'int main(void){return 0;}\n' \
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rm -f "$probe_out"
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echo "ERROR: $compiler cannot build for -arch $ARCH ($bin)" >&2
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echo " A trivial $ARCH compile + link failed with this toolchain." >&2
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if [[ "$ARCH" != "$HW_ARCH" ]]; then
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echo " Cross-building $HW_ARCH -> $ARCH needs the $ARCH SDK slice + runtime;" >&2
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echo " to build for this machine instead, re-run with: --arch $HW_ARCH" >&2
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fi
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exit 1
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fi
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rm -f "$probe_out"
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fi
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}
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# ── Default compiler selection ─────────────────────────────────
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# macOS: cc (Apple Clang). Linux/Windows: gcc (system default).
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# CI overrides via CC=gcc CXX=g++ args. Local macOS overrides via CC=cc.
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if [[ -z "${CC:-}" ]]; then
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if [[ "$OS" == "darwin" ]]; then
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export CC=cc CXX=c++
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else
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export CC=gcc CXX=g++
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fi
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fi
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# ── Print environment summary ──────────────────────────────────
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print_env() {
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local context="$1"
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echo "=== $context: os=$OS arch=$ARCH cores=$NPROC cc=${CC:-default} cxx=${CXX:-default} ==="
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}
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