huntedbytheirsandSisyphus
228ed097f0
configure.ac enforces C17 and Linux/x86_64, refuses in-tree configure; Makefile.am builds libc.a plus crt0.o; the driver Makefile dispatches out-of-tree builds into bin/release (-O2) and bin/debug (-O0 -g). Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <[email protected]>
67 lines
2.3 KiB
Makefile
67 lines
2.3 KiB
Makefile
# Makefile.am — nulsl-libc
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#
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# This is the AUTOTOOLS makefile. It is only ever instantiated by a configure
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# run inside bin/release/ or bin/debug/ (never at the repository root).
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#
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# Everything is a static library. No libtool, no shared objects, no dynamic
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# linker. See docs/architecture.md.
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#
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# Benchmarks and tests live in one Makefile on purpose: automake orders
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# targets by dependency, so libc.a (and crt0.o) are guaranteed to exist
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# before any -nostdlib binary links against them. With SUBDIRS, recursion
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# builds the subdirectories first and linking breaks.
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AUTOMAKE_OPTIONS = foreign
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AM_CPPFLAGS = -I$(top_srcdir)/include
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AM_CFLAGS = -std=c17 -ffreestanding -fno-builtin -fno-stack-protector \
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-Wall -Wextra -Wshadow -Wpointer-arith
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lib_LIBRARIES = libc.a
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libc_a_SOURCES = \
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src/errno.c \
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src/stdio.c \
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src/stdlib.c \
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src/string.c \
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src/syscall.c \
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src/unistd.c
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# The C runtime entry point is deliberately NOT a member of libc.a: nothing
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# references _start, so the linker would never extract it from an archive.
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# It is built as a standalone object and linked explicitly by everything
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# that wants a runnable binary.
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noinst_DATA = crt0.o
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crt0.o: $(top_srcdir)/src/crt/crt0.S
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$(CC) $(AM_CPPFLAGS) $(CFLAGS) -c -o $@ $<
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CLEANFILES = crt0.o
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EXTRA_DIST = autogen.sh
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# --- benchmarks ------------------------------------------------------------
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# Fully static, -nostdlib: the numbers reflect exactly what ships.
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noinst_PROGRAMS = benchmarks/bench_strlen benchmarks/bench_syscall
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benchmarks_bench_strlen_SOURCES = benchmarks/bench_strlen.c
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benchmarks_bench_strlen_LDADD = crt0.o libc.a -lgcc
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benchmarks_bench_strlen_LDFLAGS = -nostdlib -static -no-pie -Wno-unused-command-line-argument
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benchmarks_bench_syscall_SOURCES = benchmarks/bench_syscall.c
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benchmarks_bench_syscall_LDADD = crt0.o libc.a -lgcc
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benchmarks_bench_syscall_LDFLAGS = -nostdlib -static -no-pie -Wno-unused-command-line-argument
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.PHONY: bench
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bench: all
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./benchmarks/bench_strlen
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./benchmarks/bench_syscall
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# --- tests ------------------------------------------------------------------
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check_PROGRAMS = tests/smoke
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TESTS = tests/smoke
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tests_smoke_SOURCES = tests/smoke.c
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tests_smoke_LDADD = crt0.o libc.a -lgcc
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tests_smoke_LDFLAGS = -nostdlib -static -no-pie -Wno-unused-command-line-argument
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