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Diffstat (limited to 'config/prelude.mk')
| -rw-r--r-- | config/prelude.mk | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/config/prelude.mk b/config/prelude.mk new file mode 100644 index 0000000..1d5fb83 --- /dev/null +++ b/config/prelude.mk @@ -0,0 +1,164 @@ +# 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}} + +# 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 + +# 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/version.o \ + ${OBJ}/src/xregex.o \ + ${OBJ}/src/xspawn.o \ + ${OBJ}/src/xtime.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} |