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# Copyright © Tavian Barnes <tavianator@tavianator.com>
# SPDX-License-Identifier: 0BSD
# Common makefile utilities. Compatible with both GNU make and most BSD makes.
# BSD make will chdir into ${.OBJDIR} by default, unless we tell it not to
.OBJDIR: .
# We don't use any suffix rules
.SUFFIXES:
# GNU make has $^ for the full list of targets, while BSD make has $> and the
# long-form ${.ALLSRC}. We could write $^ $> to get them both, but that would
# break if one of them implemented support for the other. So instead, bring
# BSD's ${.ALLSRC} to GNU.
.ALLSRC ?= $^
# Installation paths
DESTDIR ?=
PREFIX ?= /usr
MANDIR ?= ${PREFIX}/share/man
# Configurable executables
CC ?= cc
INSTALL ?= install
MKDIR ?= mkdir -p
PKG_CONFIG ?= pkg-config
RM ?= rm -f
# GNU and BSD make have incompatible syntax for conditionals, but we can do a
# lot with just nested variable expansion. We use "y" as the canonical
# truthy value, and "" (the empty string) as the canonical falsey value.
#
# To normalize a boolean, use ${TRUTHY,${VAR}}, which expands like this:
#
# VAR=y ${TRUTHY,${VAR}} => ${TRUTHY,y} => y
# VAR=1 ${TRUTHY,${VAR}} => ${TRUTHY,1} => y
# VAR=n ${TRUTHY,${VAR}} => ${TRUTHY,n} => [empty]
# VAR=other ${TRUTHY,${VAR}} => ${TRUTHY,other} => [empty]
# VAR= ${TRUTHY,${VAR}} => ${TRUTHY,} => [empty]
#
# Inspired by https://github.com/wahern/autoguess
TRUTHY,y := y
TRUTHY,1 := y
# Boolean operators are also implemented with nested expansion
NOT, := y
# Normalize ${V} to either "y" or ""
export XV=${TRUTHY,${V}}
# Suppress output unless V=1
Q, := @
Q := ${Q,${XV}}
# Show full commands with `make V=1`, otherwise short summaries
MSG = @build/msg.sh
# cat a file if V=1
VCAT,y := @cat
VCAT, := @:
VCAT := ${VCAT,${XV}}
# All external dependencies
ALL_PKGS := \
libacl \
libcap \
libselinux \
liburing \
oniguruma
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