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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 ?= $^
# For out-of-tree builds, e.g.
#
# $ make config BUILDDIR=/path/to/build/dir
# $ make BUILDDIR=/path/to/build/dir
BUILDDIR ?= .
# Shorthand for build subdirectories
BIN := ${BUILDDIR}/bin
GEN := ${BUILDDIR}/gen
OBJ := ${BUILDDIR}/obj
# GNU make strips a leading ./ from target names, so do the same for BSD make
BIN := ${BIN:./%=%}
GEN := ${GEN:./%=%}
OBJ := ${OBJ:./%=%}
# The configuration file generated by `make config`
CONFIG := ${GEN}/config.mk
# Installation paths
DESTDIR ?=
PREFIX ?= /usr
MANDIR ?= ${PREFIX}/share/man
# GNU make supports `export VAR`, but BSD make requires `export VAR=value`.
# Sadly, GNU make gives a recursion error on `export VAR=${VAR}`.
_BUILDDIR := ${BUILDDIR}
export BUILDDIR=${_BUILDDIR}
# Configurable executables; can be overridden with
#
# $ make config CC=clang
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,} => [emtpy]
#
# Inspired by https://github.com/wahern/autoguess
TRUTHY,y := y
TRUTHY,1 := y
# Boolean operators are also implemented with nested expansion
NOT,y :=
NOT, := y
# Support up to 5 arguments
AND,y := y
AND,y,y := y
AND,y,y,y := y
AND,y,y,y,y := y
AND,y,y,y,y,y := y
# NOR can be defined without combinatorial explosion.
# OR is just ${NOT,${NOR,...}}
NOR, := y
NOR,, := y
NOR,,, := y
NOR,,,, := y
NOR,,,,, := y
# Normalize ${V} to either "y" or ""
IS_V := ${TRUTHY,${V}}
# Suppress output unless V=1
Q, := @
Q := ${Q,${IS_V}}
# The current target, with ${BUILDDIR} stripped for shorter messages
TGT = ${@:${BUILDDIR}/%=%}
# Show full commands with `make V=1`, otherwise short summaries
MSG = @msg() { \
MSG="$$1"; \
shift; \
test "${IS_V}" || printf '%s\n' "$$MSG"; \
test "$${1:-}" || return 0; \
test "${IS_V}" && printf '%s\n' "$$*"; \
"$$@"; \
}; \
msg
# Maximum width of a short message, to align the [X]
MSG_WIDTH := 24
# cat a file if V=1
VCAT,y := @cat
VCAT, := @:
VCAT := ${VCAT,${IS_V}}
# List all object files here, as they're needed by both `make config` and `make`
# All object files except the entry point
LIBBFS := \
${OBJ}/src/alloc.o \
${OBJ}/src/bar.o \
${OBJ}/src/bfstd.o \
${OBJ}/src/bftw.o \
${OBJ}/src/color.o \
${OBJ}/src/ctx.o \
${OBJ}/src/diag.o \
${OBJ}/src/dir.o \
${OBJ}/src/dstring.o \
${OBJ}/src/eval.o \
${OBJ}/src/exec.o \
${OBJ}/src/expr.o \
${OBJ}/src/fsade.o \
${OBJ}/src/ioq.o \
${OBJ}/src/mtab.o \
${OBJ}/src/opt.o \
${OBJ}/src/parse.o \
${OBJ}/src/printf.o \
${OBJ}/src/pwcache.o \
${OBJ}/src/stat.o \
${OBJ}/src/thread.o \
${OBJ}/src/trie.o \
${OBJ}/src/typo.o \
${OBJ}/src/xregex.o \
${OBJ}/src/xspawn.o \
${OBJ}/src/xtime.o \
${OBJ}/gen/version.o
# Unit test objects
UNIT_OBJS := \
${OBJ}/tests/alloc.o \
${OBJ}/tests/bfstd.o \
${OBJ}/tests/bit.o \
${OBJ}/tests/ioq.o \
${OBJ}/tests/main.o \
${OBJ}/tests/trie.o \
${OBJ}/tests/xspawn.o \
${OBJ}/tests/xtime.o
# All object files
OBJS := \
${OBJ}/src/main.o \
${OBJ}/tests/mksock.o \
${OBJ}/tests/xspawnee.o \
${OBJ}/tests/xtouch.o \
${LIBBFS} \
${UNIT_OBJS}
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