build: generate the Makefile in python

i've been wanting to do this for a while
the main benefit is that i can do stuff per-rule, so i can get rid of the
`@mkdir -p $(D)` i had everywhere, and in the near future i can make CC
targets automatically depend on a sysroot

3 files changed, 137 insertions, 151 deletions

diff --git a/.gitignore b/.gitignore
index 9ec2699..7738e39 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 out
 cache
+Makefile
 toolchain/prefix/
 toolchain/*-build/
diff --git a/Makefile b/Makefile
deleted file mode 100644
index 4d069f8..0000000
--- a/Makefile
+++ /dev/null
@@ -1,151 +0,0 @@
-PATH   := $(shell pwd)/toolchain/prefix/bin/:$(PATH)
-
-AR      = x86_64-camellia-ar
-AS      = x86_64-camellia-as
-CC      = x86_64-camellia-gcc
-
-CFLAGS += -g -std=gnu99 -O2 -ftrack-macro-expansion=0
-CFLAGS += -Wall -Wextra -Wold-style-definition -Werror=implicit-function-declaration
-CFLAGS += -Wno-address-of-packed-member -Werror=incompatible-pointer-types
-
-KERNEL_CFLAGS  = $(CFLAGS) -ffreestanding -mno-sse -mgeneral-regs-only \
-	--sysroot=src/kernel/sysroot/ -Isrc/ -Isrc/libk/include/ -fno-pie
-LIBC_CFLAGS    = $(CFLAGS) -ffreestanding -Isrc/
-USER_CFLAGS    = $(CFLAGS)
-
-SPARSEFLAGS = -$(KERNEL_CFLAGS) -Wno-non-pointer-null
-
-PORTS =
-
-define from_sources
-  $(patsubst src/%,out/obj/%.o,$(shell find $(1) -type f,l -name '*.[csS]'))
-endef
-
-
-.PHONY: all portdeps check clean ports
-all: portdeps out/boot.iso check out/fs.e2
-portdeps: out/libc.a out/libm.a src/libc/include/__errno.h
-
-check: $(shell find src/kernel/ -type f -name *.c)
-	@echo $^ | xargs -n 1 sparse $(SPARSEFLAGS)
-
-clean:
-	rm -rf out/
-
-
-out/boot.iso: out/fs/boot/kernel out/fs/boot/grub/grub.cfg out/fs/boot/init
-	@grub-mkrescue -o $@ out/fs/ > /dev/null 2>&1
-
-out/fs/boot/kernel: src/kernel/arch/amd64/linker.ld \
-                    $(call from_sources, src/kernel/) \
-                    $(call from_sources, src/libk/)
-	@mkdir -p $(@D)
-	@$(CC) \
-		-nostdlib \
-		-Wl,-zmax-page-size=4096 -Wl,--no-warn-mismatch -Wl,-no-pie \
-		-T $^ -o $@
-	@grub-file --is-x86-multiboot2 $@ || echo "$@ has an invalid multiboot2 header"
-	@grub-file --is-x86-multiboot2 $@ || rm $@; test -e $@
-
-out/libc.a: $(call from_sources, src/libc/) $(call from_sources, src/libk/)
-	@mkdir -p $(@D)
-	@$(AR) rcs $@ $^
-
-out/libm.a:
-	@mkdir -p $(@D)
-	@$(AR) rcs $@ $^
-
-out/bootstrap: out/bootstrap.elf
-	@objcopy -O binary $^ $@
-
-out/bootstrap.elf: src/bootstrap/linker.ld $(call from_sources, src/bootstrap/) out/libc.a
-	@mkdir -p $(@D)
-	@$(CC) -nostdlib -Wl,-no-pie -T $^ -o $@
-
-out/fs/boot/init: out/bootstrap out/initrd.tar
-	@mkdir -p $(@D)
-	@cat $^ > $@
-
-out/fs/boot/grub/grub.cfg: src/kernel/arch/amd64/grub.cfg
-	@mkdir -p $(@D)
-	@cp $< $@
-
-out/fs.e2:
-	@mkfs.ext2 $@ 1024 > /dev/null
-
-define userbin_template =
-out/initrd/bin/amd64/$(1): $(call from_sources, src/cmd/$(1)) out/libc.a
-	@mkdir -p $$(@D)
-	@$(CC) $$^ -o $$@
-endef
-USERBINS := $(shell ls src/cmd)
-$(foreach bin,$(USERBINS),$(eval $(call userbin_template,$(bin))))
-
-# don't build the example implementation from libext2
-out/obj/cmd/ext2fs/ext2/example.c.o:
-	@touch $@
-
-# portdeps is phony, so ports/% is automatically "phony" too
-ports: $(patsubst %,ports/%,$(PORTS))
-ports/%: portdeps
-	+$@/port install
-
-out/initrd/%: sysroot/%
-	@mkdir -p $(@D)
-	@cp $< $@
-
-out/initrd.tar: $(patsubst sysroot/%,out/initrd/%,$(shell find sysroot/ -type f)) \
-                $(patsubst %,out/initrd/bin/amd64/%,$(USERBINS)) \
-                $(shell find out/initrd/) \
-				ports
-	@cd out/initrd; tar chf ../initrd.tar *
-
-
-out/obj/%.s.o: src/%.s
-	@mkdir -p $(@D)
-	@$(AS) $^ -o $@
-
-out/obj/%.S.o: src/%.S
-	@mkdir -p $(@D)
-	@$(CC) $(CFLAGS) -c $^ -o $@
-
-out/obj/libk/%.c.o: src/libk/%.c
-	@mkdir -p $(@D)
-	@$(CC) $(KERNEL_CFLAGS) -fPIC -c $^ -o $@
-
-out/obj/kernel/%.c.o: src/kernel/%.c
-	@mkdir -p $(@D)
-	@$(CC) $(KERNEL_CFLAGS) -fPIC -c $^ -o $@
-
-out/obj/%.c.o: src/%.c
-	@mkdir -p $(@D)
-	@$(CC) $(USER_CFLAGS) -fPIC -c $^ -o $@
-
-out/obj/libc/%.c.o: src/libc/%.c
-	@mkdir -p $(@D)
-	@$(CC) $(LIBC_CFLAGS) -fPIC -c $^ -o $@
-
-out/obj/libc/vendor/%.c.o: src/libc/vendor/%.c
-	@mkdir -p $(@D)
-	@$(CC) $(LIBC_CFLAGS) -fPIC -c $^ -o $@ \
-		-DLACKS_TIME_H -DLACKS_FCNTL_H -DLACKS_SYS_PARAM_H \
-		-DMAP_ANONYMOUS -DHAVE_MORECORE=0 -DNO_MALLOC_H \
-		-Wno-expansion-to-defined -Wno-old-style-definition
-
-out/obj/bootstrap/%.c.o: src/bootstrap/%.c
-	@mkdir -p $(@D)
-	@$(CC) $(USER_CFLAGS) -fno-pic -c $^ -o $@
-
-out/obj/kernel/arch/amd64/32/%.c.o: src/kernel/arch/amd64/32/%.c
-	@mkdir -p $(@D)
-	@$(CC) $(KERNEL_CFLAGS) -m32 -c $^ -o $@
-
-out/obj/kernel/arch/amd64/32/%.s.o: src/kernel/arch/amd64/32/%.s
-	@mkdir -p $(@D)
-	@$(CC) -m32 -c $^ -o $@
-
-src/libc/include/__errno.h: src/libc/include/__errno.h.awk src/libk/include/camellia/errno.h
-	@awk -f $^ > $@
-
-src/libc/syscall.c: src/libc/syscall.c.awk src/libk/include/camellia/syscalls.h
-	@awk -f $^ > $@
diff --git a/configure b/configure
new file mode 100755
index 0000000..aec448d
--- /dev/null
+++ b/configure
@@ -0,0 +1,136 @@
+#!/usr/bin/env python3
+from glob import glob
+
+file = open('Makefile', 'w', encoding='utf-8')
+def raw(s):
+	print(s, file=file)
+
+def srcobj(path):
+	srcs = glob(path + '/**/*.[csS]', recursive=True)
+	objs = ['out/obj/' + src.removeprefix('src/') + '.o' for src in srcs]
+	return ' ' + ' '.join(objs) + ' '
+
+def t(out, deps='', cmds=[], phony=False, verbose=False):
+	if phony:
+		raw(f".PHONY: {out}")
+	else:
+		cmds = ["mkdir -p $(@D)"] + cmds
+	raw(f"{out}: {deps}")
+	v = '' if verbose else '@'
+	for cmd in cmds:
+		raw(f"\t{v}{cmd}")
+
+
+raw("""
+# automatically generated by ./configure
+
+PATH := $(shell pwd)/toolchain/prefix/bin/:$(PATH)
+
+AR = x86_64-camellia-ar
+AS = x86_64-camellia-as
+CC = x86_64-camellia-gcc
+
+CFLAGS = -g -std=gnu99 -O2 -fPIC -ftrack-macro-expansion=0 \
+ -Wall -Wextra -Wold-style-definition -Wno-address-of-packed-member \
+ -Werror=incompatible-pointer-types -Werror=implicit-function-declaration
+
+CFLAGS_KERNEL  = $(CFLAGS) \
+	-ffreestanding -mno-sse -mgeneral-regs-only \
+	--sysroot=src/kernel/sysroot/ -Isrc/ -Isrc/libk/include/
+CFLAGS_LIBC    = $(CFLAGS) -ffreestanding -Isrc/
+
+SPARSEFLAGS = $(CFLAGS_KERNEL) -Wno-non-pointer-null
+""")
+
+t('all', 'out/boot.iso out/fs.e2 check', phony=True)
+t('portdeps', 'out/libc.a out/libm.a src/libc/include/__errno.h', phony=True)
+
+# TODO check userland sources too
+t('check', '', [
+	'find src/kernel/ -type f -name *.c | xargs -n 1 sparse $(SPARSEFLAGS)'
+], phony=True)
+
+t('clean', '', [
+	'rm -rf out/'
+], phony=True, verbose=True)
+
+raw("""
+PORTS=
+.PHONY: ports
+# portdeps is phony, so ports/% is automatically "phony" too
+ports: $(patsubst %,ports/%,$(PORTS))
+ports/%: portdeps
+	+$@/port install
+""")
+
+t('out/boot.iso', 'out/fs/boot/kernel out/fs/boot/grub/grub.cfg out/fs/boot/init', [
+	'grub-mkrescue -o $@ out/fs/ >/dev/null 2>&1'
+])
+
+t('out/fs/boot/kernel', 'src/kernel/arch/amd64/linker.ld' + srcobj('src/kernel/') + srcobj('src/libk/'), [
+	'$(CC) -nostdlib -Wl,-zmax-page-size=4096 -Wl,--no-warn-mismatch -Wl,-no-pie -T $^ -o $@',
+	'grub-file --is-x86-multiboot2 $@ || echo "$@ has an invalid multiboot2 header"',
+	'grub-file --is-x86-multiboot2 $@ || rm $@; test -e $@'
+])
+
+t('out/libc.a', srcobj('src/libc/') + srcobj('src/libk/'), [
+	'$(AR) rcs $@ $^'
+])
+t('out/libm.a', '', [
+	'$(AR) rcs $@ $^'
+])
+
+t('out/bootstrap', 'out/bootstrap.elf', ['objcopy -O binary $^ $@'])
+t('out/bootstrap.elf', 'src/bootstrap/linker.ld' + srcobj('src/bootstrap/') + 'out/libc.a', [
+	'$(CC) -nostdlib -Wl,-no-pie -T $^ -o $@'
+])
+
+t('out/fs/boot/init', 'out/bootstrap out/initrd.tar', ['cat $^ > $@'])
+
+t('out/fs/boot/grub/grub.cfg', 'src/kernel/arch/amd64/grub.cfg', ['cp $< $@'])
+
+t('out/fs.e2', '', ['mkfs.ext2 $@ 1024 >/dev/null'])
+
+userbins = glob('*', root_dir='src/cmd/')
+raw("USERBINS = " + " ".join(userbins))
+
+for cmd in userbins:
+	t(f'out/initrd/bin/amd64/{cmd}', 'out/libc.a' + srcobj(f'src/cmd/{cmd}'), [
+		'$(CC) $^ -o $@'
+	])
+
+# don't build the example implementation from libext2
+t('out/obj/cmd/ext2fs/ext2/example.c.o', '', ['touch $@'])
+
+t('out/initrd/%', 'sysroot/%', ['cp $< $@'])
+
+t('out/initrd.tar',
+	'$(patsubst sysroot/%,out/initrd/%,$(shell find sysroot/ -type f)) '
+	'$(patsubst %,out/initrd/bin/amd64/%,$(USERBINS)) '
+	'$(shell find out/initrd/) '
+	'ports ',
+	['cd out/initrd; tar chf ../initrd.tar *'])
+
+t('src/libc/include/__errno.h',
+	'src/libc/include/__errno.h.awk src/libk/include/camellia/errno.h',
+	['awk -f $^ > $@'])
+
+t('src/libc/syscall.c',
+	'src/libc/syscall.c.awk src/libk/include/camellia/syscalls.h',
+	['awk -f $^ > $@'])
+
+def cc(rule, args):
+	t(f'out/obj/{rule}.o', f'src/{rule}', [f'$(CC) -c $^ -o $@ {args}'])
+
+cc("%.c",           "$(CFLAGS)")
+cc("%.s",           "$(CFLAGS)")
+cc("%.S",           "$(CFLAGS)")
+cc("bootstrap/%.c", "$(CFLAGS) -fno-pie")
+cc("kernel/%.c",    "$(CFLAGS_KERNEL)")
+cc("libc/%.c",      "$(CFLAGS_LIBC)")
+cc("libk/%.c",      "$(CFLAGS_KERNEL)")
+
+cc("kernel/arch/amd64/32/%.c", "$(CFLAGS_KERNEL) -fno-pic -m32")
+cc("kernel/arch/amd64/32/%.s", "$(CFLAGS_KERNEL) -fno-pic -m32")
+
+cc("libc/vendor/dlmalloc/%.c", "$(CFLAGS_LIBC) -DMAP_ANONYMOUS -DHAVE_MORECORE=0 -DNO_MALLOC_H -Wno-expansion-to-defined -Wno-old-style-definition")