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]>
51 lines
1.9 KiB
Plaintext
51 lines
1.9 KiB
Plaintext
dnl configure.ac — nulsl-libc, a very lightweight C17 libc for Linux.
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dnl
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dnl Static-only on purpose: the dynamic linker is a memory tax we refuse to
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dnl pay (see docs/architecture.md). libc.a is a plain archive, so no libtool.
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dnl
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dnl IMPORTANT: never run ./configure at the repository root. The root holds a
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dnl hand-written driver Makefile that builds into bin/{release,debug}; the
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dnl guard below refuses to overwrite it.
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AC_PREREQ([2.71])
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AC_INIT([nulsl-libc], [0.1.0], [], [nulsl-libc],
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[https://git.spectoria.dev/The-Null-Linux-Project/nulsl-libc])
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AC_CONFIG_SRCDIR([include/stdio.h])
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AC_CONFIG_AUX_DIR([build-aux])
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AC_CANONICAL_HOST
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AM_INIT_AUTOMAKE([foreign subdir-objects])
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dnl C17, and only C17 (project guideline #1). Modern autoconf ships no
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dnl AC_PROG_CC_C17 macro, so prove it with a compile test instead.
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AC_PROG_CC
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saved_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS -std=c17"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#if __STDC_VERSION__ < 201710L
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#error "not C17"
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#endif
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], [])],
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[],
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[AC_MSG_ERROR([nulsl-libc requires a C17 compiler (GCC >= 8 or Clang >= 6); -std=c17 was rejected])])
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CFLAGS="$saved_CFLAGS"
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dnl Target validation: Linux on x86_64, for now.
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AS_CASE([$host_os],
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[linux*], [],
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[AC_MSG_ERROR([nulsl-libc currently targets Linux only (configured for $host_os)])])
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AS_CASE([$host_cpu],
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[x86_64], [],
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[AC_MSG_ERROR([nulsl-libc currently targets x86_64 only (configured for $host_cpu); src/arch/ is where new ports go])])
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dnl Plain archives need ar/ranlib; no libtool, no shared objects.
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AC_CHECK_TOOL([AR], [ar])
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AC_PROG_RANLIB
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dnl Refuse in-tree configuration: it would clobber the committed driver
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dnl Makefile that dispatches into bin/{release,debug}.
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AS_IF([test "x$srcdir" = "x." && test -f Makefile],
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[AC_MSG_ERROR([in-tree builds are disabled — run 'make release' or 'make debug' from the repository root instead])])
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AC_CONFIG_FILES([Makefile])
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AC_OUTPUT
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