Context/env.mk at shell · Mapuse/Context · GitHub

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# env.mk — GNU make equivalent of scripts/env.sh for Context (ctx).
#
# Usage:  make -f env.mk -f Makefile <target>
#   or:   -include env.mk   (additive, in the repo Makefile)
#
# Everything is self-located: REPO_ROOT from this file's own path.
# Variables are set with ?= so they remain overridable from the
# command line or the including Makefile.
#
# Contract: docs/BUILD-SYSTEMS.md pattern — hosts (gcc/musl/-system × libc),
# the four rust targets, and LAYOUT_ROOT/DESTDIR semantics.

# ── Self-location ────────────────────────────────────────────────────
REPO_ROOT := $(abspath $(dir $(lastword $(MAKEFILE_LIST))))

# ── Host profile (auto-detect unless overridden) ─────────────────────
HOST ?= auto
ifeq ($(HOST),auto)
  HOST := $(if $(wildcard /lib/ld-musl-*.so.1),musl,gcc)
endif
# .cargo/config.toml [build]/[target] rustflags carry the pyo3 abi3 cfg and
# per-target -C target-cpu / +crt-static entries; those are preserved as long
# as RUSTFLAGS is not forced here (RUSTFLAGS would override config.toml's).

# HOST_LIBC = musl or gcc, independent of layout suffix.
ifeq ($(findstring musl,$(HOST)),musl)
  HOST_LIBC := musl
else
  HOST_LIBC := gcc
endif

# LAYOUT_ROOT = /usr (normal) or /system (-system hosts).
ifeq ($(findstring system,$(HOST)),system)
  LAYOUT_ROOT := /system
else
  LAYOUT_ROOT := /usr
endif

# ── Host architecture (auto-detected, orthogonal to the host profile) ─
HOST_ARCH_RAW := $(shell uname -m)
ifneq ($(filter x86_64 aarch64,$(HOST_ARCH_RAW)),)
  HOST_ARCH := $(HOST_ARCH_RAW)
  ifeq ($(HOST_ARCH_RAW),x86_64)
    HOST_ARCH_SHORT := amd64
  else
    HOST_ARCH_SHORT := arm64
  endif
else
  $(error Unsupported architecture: $(HOST_ARCH_RAW). Supported: x86_64, aarch64)
endif

# ── Cross-compilation sysroot (aarch64 targets) ──────────────────────
CROSS_INCLUDE_DIR ?= $(LAYOUT_ROOT)/aarch64-linux-gnu/include
CROSS_GCC_DIR     ?= $(LAYOUT_ROOT)/lib/gcc-cross/aarch64-linux-gnu

# ── Per-target CC / CXX / AR defaults ────────────────────────────────
# musl targets: clang family
CC_x86_64_unknown_linux_musl  ?= clang -target x86_64-linux-musl
CXX_x86_64_unknown_linux_musl ?= clang++ -target x86_64-linux-musl
AR_x86_64_unknown_linux_musl  ?= llvm-ar-21

CC_aarch64_unknown_linux_musl  ?= clang -target aarch64-linux-musl
CXX_aarch64_unknown_linux_musl ?= clang++ -target aarch64-linux-musl
AR_aarch64_unknown_linux_musl  ?= llvm-ar-21

# gnu targets: gcc family
CC_x86_64_unknown_linux_gnu  ?= gcc
CXX_x86_64_unknown_linux_gnu ?= g++
AR_x86_64_unknown_linux_gnu  ?= ar

CC_aarch64_unknown_linux_gnu  ?= aarch64-linux-gnu-gcc
CXX_aarch64_unknown_linux_gnu ?= aarch64-linux-gnu-g++
AR_aarch64_unknown_linux_gnu  ?= aarch64-linux-gnu-ar

# ── pkg-config (host sysroot; layout-aware) ──────────────────────────
PKG_CONFIG_SYSROOT_DIR ?= /
PKG_CONFIG_LIBDIR       ?= $(LAYOUT_ROOT)/lib/pkgconfig:$(LAYOUT_ROOT)/share/pkgconfig
PKG_CONFIG_PATH         ?=
PKG_CONFIG_ALLOW_CROSS        ?= 1
PKG_CONFIG_ALLOW_SYSTEM_LIBS  ?= 1
PKG_CONFIG_ALLOW_SYSTEM_CFLAGS ?= 1
PKG_CONFIG_ALLOW_SYSTEM_STATIC ?= 1
PKG_CONFIG_ALLOW_STATIC       ?= 1

# ── DESTDIR defaults (per host) ──────────────────────────────────────
# Default install prefix: /usr for /usr hosts, /system for -system hosts.
DESTDIR ?=
ifeq ($(strip $(DESTDIR)),)
  DESTDIR := $(LAYOUT_ROOT)
endif

# ── Man pages ────────────────────────────────────────────────────────
INSTALL_MAN ?= yes
MAN_SRC_DIR  := docs
MAN_MAN1     := $(sort $(wildcard $(REPO_ROOT)/$(MAN_SRC_DIR)/ctx.1))
MANPAGES     := $(MAN_MAN1)

# ── RUSTFLAGS for static musl links (opt-in, not exported globally) ──
RUSTFLAGS_TARGET_MUSL ?= -C target-feature=+crt-static