# Makefile.am — nulsl-libc
#
# This is the AUTOTOOLS makefile. It is only ever instantiated by a configure
# run inside bin/release/ or bin/debug/ (never at the repository root).
#
# Everything is a static library. No libtool, no shared objects, no dynamic
# linker. See docs/architecture.md.
#
# Benchmarks and tests live in one Makefile on purpose: automake orders
# targets by dependency, so libc.a (and crt0.o) are guaranteed to exist
# before any -nostdlib binary links against them. With SUBDIRS, recursion
# builds the subdirectories first and linking breaks.

AUTOMAKE_OPTIONS = foreign

AM_CPPFLAGS = -I$(top_srcdir)/include
AM_CFLAGS = -std=c17 -ffreestanding -fno-builtin -fno-stack-protector \
            -Wall -Wextra -Wshadow -Wpointer-arith

lib_LIBRARIES = libc.a

libc_a_SOURCES = \
    src/errno.c \
    src/stdio.c \
    src/stdlib.c \
    src/string.c \
    src/syscall.c \
    src/unistd.c

# The C runtime entry point is deliberately NOT a member of libc.a: nothing
# references _start, so the linker would never extract it from an archive.
# It is built as a standalone object and linked explicitly by everything
# that wants a runnable binary.
noinst_DATA = crt0.o
crt0.o: $(top_srcdir)/src/crt/crt0.S
	$(CC) $(AM_CPPFLAGS) $(CFLAGS) -c -o $@ $<
CLEANFILES = crt0.o

EXTRA_DIST = autogen.sh

# --- benchmarks ------------------------------------------------------------
# Fully static, -nostdlib: the numbers reflect exactly what ships.

noinst_PROGRAMS = benchmarks/bench_strlen benchmarks/bench_syscall

benchmarks_bench_strlen_SOURCES = benchmarks/bench_strlen.c
benchmarks_bench_strlen_LDADD = crt0.o libc.a -lgcc
benchmarks_bench_strlen_LDFLAGS = -nostdlib -static -no-pie -Wno-unused-command-line-argument

benchmarks_bench_syscall_SOURCES = benchmarks/bench_syscall.c
benchmarks_bench_syscall_LDADD = crt0.o libc.a -lgcc
benchmarks_bench_syscall_LDFLAGS = -nostdlib -static -no-pie -Wno-unused-command-line-argument

.PHONY: bench
bench: all
	./benchmarks/bench_strlen
	./benchmarks/bench_syscall

# --- tests ------------------------------------------------------------------

check_PROGRAMS = tests/smoke
TESTS = tests/smoke

tests_smoke_SOURCES = tests/smoke.c
tests_smoke_LDADD = crt0.o libc.a -lgcc
tests_smoke_LDFLAGS = -nostdlib -static -no-pie -Wno-unused-command-line-argument