#	$NetBSD: configure.ac,v 1.105 2023/06/03 09:10:13 lukem Exp $
#
# Autoconf definition file for libnbcompat.
#
# When you edit configure.ac:
# 0. Create the tools versions of autoconf and autoheader:
#        cd ${SRCDIR} && ./build.sh -V MKMAINTAINERTOOLS=yes tools
#    (This might not work if you try it after editing configure.ac.)
# 1. edit configure.ac
# 2. Regenerate "configure" and "nbtool_config.h.in" from "configure.ac":
#        cd ${SRCDIR}/tools/compat && ${TOOLDIR}/bin/nbmake-${MACHINE} regen
#    (Please don't use a non-tools version of autoconf or autoheader.)
# 3. Test that the tools still build:
#        mv ${TOOLDIR} ${TOOLDIR}.bak
#        cd ${SRCDIR} && ./build.sh -V MKMAINTAINERTOOLS=yes tools
# 4. cvs commit files that you edited.
# 5. Regen again, to pick up changed RCS IDs from the above commit:
#        cd ${SRCDIR}/tools/compat && ${TOOLDIR}/bin/nbmake-${MACHINE} regen
# 6. cvs commit files that were generated.
#

AC_INIT([libnbcompat], [noversion], [lib-bug-people@NetBSD.org])
AC_CONFIG_HEADERS([nbtool_config.h])
AC_CONFIG_FILES([defs.mk])
AC_CONFIG_MACRO_DIR([buildaux])

m4_pattern_forbid([^AX_])
m4_pattern_forbid([^NB_])

# Autoheader header and footer
AH_TOP([/*      $][NetBSD$    */
 
#ifndef __NETBSD_NBTOOL_CONFIG_H__
#define __NETBSD_NBTOOL_CONFIG_H__])

AH_BOTTOM([#include "compat_defs.h"
#endif /* !__NETBSD_NBTOOL_CONFIG_H__ */])

AC_DEFUN([NB_NETBSD], [dnl
      AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl
      AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
      AC_MSG_CHECKING([for NetBSD])
      AC_EGREP_CPP(yes,
      [#ifdef __NetBSD__
	yes
	#endif
	],
	[AC_MSG_RESULT([yes])
	 AC_DEFINE([_POSIX_SOURCE], 1, [Define for NetBSD headers.])
	 AC_DEFINE([_POSIX_C_SOURCE], 200112L, [Define for NetBSD headers.])
	 AC_DEFINE([_XOPEN_SOURCE], 600, [Define for NetBSD headers.])],
	[AC_MSG_RESULT([no])])
])dnl NB_NETBSD

NB_NETBSD()
AC_PATH_PROG(BSHELL, sh, )
if test x"$BSHELL" = x; then
	AC_MSG_ERROR([sh must be somewhere on \$PATH])
fi
AC_DEFINE_UNQUOTED([PATH_BSHELL], "$BSHELL", [Path to sh(1).])

AC_C_BIGENDIAN()
AC_HEADER_STDC()

# Confirm existence of zlib.  (This is available as a default install
# option on many OS's; this could be added as a reachover build in the
# future.)
AC_CHECK_HEADER(zlib.h,,
	AC_MSG_ERROR([zlib must be installed in a compiler-visible path]))
AC_CHECK_LIB(z, gzdopen,,
	AC_MSG_ERROR([zlib must be installed in a compiler-visible path]))

# Make sure certain required headers are available.
# These are not necessarily required by the code, but they are not
# currently conditionalized.
AC_CHECK_HEADERS(sys/ioctl.h sys/mman.h sys/param.h \
	sys/socket.h sys/stat.h sys/time.h sys/types.h sys/utsname.h \
	sys/wait.h assert.h ctype.h errno.h fcntl.h grp.h limits.h locale.h \
	netdb.h pwd.h signal.h stdarg.h stdio.h stdlib.h string.h \
	termios.h unistd.h,,
	AC_MSG_ERROR([standard system header file not found]))

# Find headers that may not be available.
AC_HEADER_DIRENT()
AC_CHECK_HEADERS(sys/mtio.h sys/sysmacros.h sys/syslimits.h stdio_ext.h \
	getopt.h features.h malloc.h sys/poll.h pthread.h stddef.h sys/uio.h)
AC_CHECK_HEADERS(sys/bswap.h machine/bswap.h sys/cdefs.h machine/endian.h \
	sys/endian.h sys/featuretest.h err.h inttypes.h libgen.h paths.h \
	libgen.h stdint.h util.h resolv.h arpa/nameser.h,,
	[test -f include/$ac_header || touch include/$ac_header])
AC_CHECK_HEADERS(rpc/types.h,,
	[echo '#include "nbtool_config.h"' >include/$ac_header.new
	echo '#include "'$srcdir/../../common/include/$ac_header'"' \
		>>include/$ac_header.new
	if cmp include/$ac_header.new include/$ac_header >/dev/null 2>&1; then
		rm -f include/$ac_header.new
	else
		mv -f include/$ac_header.new include/$ac_header
	fi])
AC_CHECK_HEADERS(netconfig.h,,
	[echo '#include "nbtool_config.h"' >include/$ac_header.new
	echo '#include "'$srcdir/../../include/$ac_header'"' \
		>>include/$ac_header.new
	if cmp include/$ac_header.new include/$ac_header >/dev/null 2>&1; then
		rm -f include/$ac_header.new
	else
		mv -f include/$ac_header.new include/$ac_header
	fi])

# Typedefs.
AC_TYPE_SIZE_T()
AC_CHECK_TYPES([id_t, long long, u_long, u_char, u_short, u_int, u_quad_t])
AC_CHECK_TYPES([uchar_t, ushort_t, uint_t, ulong_t])
AC_CHECK_TYPE(socklen_t, [AC_DEFINE([HAVE_SOCKLEN_T], 1,
			  [Define if you have the socklen_t type.])],,
[#include <sys/types.h>
#ifdef HAVE_RPC_TYPES_H
#include <rpc/types.h>
#endif
#include <sys/socket.h>])

AC_MSG_CHECKING([for enum uio_rw])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <sys/types.h>
#ifdef HAVE_SYS_UIO_H
#include <sys/uio.h>
#endif]],
[[enum uio_rw rw;]])],
[AC_MSG_RESULT(yes)
 AC_DEFINE([HAVE_ENUM_UIO_RW], 1,
    [Define if you have the enum uio_rw type.])],
[AC_MSG_RESULT(no)])

AC_MSG_CHECKING([for enum uio_seg])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <sys/types.h>
#ifdef HAVE_SYS_UIO_H
#include <sys/uio.h>
#endif]],
[[enum uio_seg seg;]])],
[AC_MSG_RESULT(yes)
 AC_DEFINE([HAVE_ENUM_UIO_SEG], 1,
    [Define if you have the enum uio_seg type.])],
[AC_MSG_RESULT(no)])

dnl XXX - This is UGLY.  Need a better way to homogenize the bitsized types,
dnl including use of compiler primitive types via AC_CHECK_SIZEOF.
dnl
AC_DEFUN([NB_CHECK_INTTYPE], [dnl
	AC_CHECK_TYPE(uint][$1][_t,, [
		AC_CHECK_TYPE(u_int][$1][_t,
			AC_DEFINE(uint][$1][_t, u_int][$1][_t, \
			          [Define if you have u_int][$1][_t, but not uint][$1][_t.]),
			AC_MSG_ERROR([cannot find a suitable type for uint][$1][_t]))
	])
	AC_CHECK_TYPE(u_int][$1][_t,, [
		AC_CHECK_TYPE(uint][$1][_t,
			AC_DEFINE(u_int][$1][_t, uint][$1][_t, \
				  [Define if you have uint][$1][_t, but not u_int][$1][_t.]),
			AC_MSG_ERROR([cannot find a suitable type for u_int][$1][_t]))
	])
])dnl NB_CHECK_INTTYPE

NB_CHECK_INTTYPE(8)
NB_CHECK_INTTYPE(16)
NB_CHECK_INTTYPE(32)
NB_CHECK_INTTYPE(64)

# Struct members.
AC_CHECK_MEMBERS([DIR.dd_fd, DIR.__dd_fd, struct dirent.d_namlen],,,
[#include <sys/types.h>
#include <dirent.h>])
AC_CHECK_MEMBERS([struct stat.st_flags, struct stat.st_gen,
	struct stat.st_birthtime, struct stat.st_birthtimensec,
	struct stat.st_atim, struct stat.st_mtimensec],,, 
	[#include <sys/stat.h>])
AC_CHECK_MEMBERS(struct statvfs.f_iosize,,, [#include <sys/statvfs.h>])
AC_CHECK_MEMBERS(struct tm.tm_gmtoff,,, [#include <time.h>])

# Global variable decls.
AC_CHECK_DECLS([asprintf, asnprintf, vasprintf, vasnprintf, vsnprintf, fgetln, fparseln,
	fpurge, getdelim, getline, snprintf],,, [
#include <stdio.h>
])

AC_CHECK_DECLS([atoll, heapsort, mkdtemp, mkstemp, reallocarr, reallocarray,
	getsubopt, setenv, strtoi, strtoll, strtou, setprogname,
	getprogname],,, [
#include <stdlib.h>
])

AC_CHECK_DECLS([basename, dirname],,, [
#include <libgen.h>
])

AC_CHECK_DECLS([raise_default_signal],,, [
#include <util.h>
])

AC_CHECK_DECLS([issetugid, pread, pwrite],,, [
#include <unistd.h>
])

AC_CHECK_DECLS([strmode],,, [
#include <unistd.h>
#include <string.h>
])

AC_CHECK_DECLS([isblank],,, [
#include <ctype.h>
])


AC_CHECK_DECLS([optind, optreset],,, [
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
])
AC_CHECK_DECLS(sys_signame,,, [#include <signal.h>])

# Library functions (where a .h check isn't enough).
AC_FUNC_ALLOCA()
AC_CHECK_FUNCS(atoll asprintf asnprintf basename devname dirfd dirname \
	dispatch_semaphore_create \
	dprintf esetfunc fgetln flock fpurge __fpurge futimes getline \
	getopt getopt_long group_from_gid gid_from_group \
	heapsort isblank issetugid lchflags lchmod lchown lutimes mkstemp \
	mkdtemp poll pread putc_unlocked pwcache_userdb pwcache_groupdb \
	pwrite raise_default_signal random reallocarr reallocarray setenv \
	setgroupent setprogname setpassent \
	snprintb_m snprintf strlcat strlcpy strmode \
	strcasecmp strncasecmp strndup strnlen strsep strsuftoll strtoi \
	strtoll strtou \
	user_from_uid uid_from_user vasprintf vasnprintf vsnprintf)

AC_CHECK_DECLS([user_from_uid, uid_from_user, pwcache_userdb],,,[
#include <pwd.h>
])
AC_CHECK_DECLS([group_from_gid, gid_from_group, pwcache_groupdb],,,[
#include <grp.h>
])
AC_CHECK_DECLS([strcasecmp, strncasecmp, strlcpy, strlcat, strndup,
		strnlen, strsep],,,[
#include <string.h>
])
AC_CHECK_DECLS([strsuftoll, mi_vector_hash],,,[#include <stdlib.h>])
AC_CHECK_DECLS([lchflags, lchmod, lchown],,,[
#include <sys/stat.h>
#include <unistd.h>
])

AC_CHECK_DECLS([err, errc, errx, verrc, verrx, warn, warnc, warnx, vwarnc,
		vwarnx],,,[
#ifdef HAVE_ERR_H
#include <err.h>
#endif
])

AC_CHECK_DECLS([htobe16, htobe32, htobe64, htole16, htole32, htole64,
		be16toh, be32toh, be64toh, le16toh, le32toh, le64toh],,,
		[#include <sys/types.h>])

AC_CHECK_DECLS([bswap16, bswap32, bswap64],,, [#include <machine/bswap.h>])

AC_CHECK_DECLS([be16enc, le16enc, be16dec, le16dec, be32enc, le32enc,
		be32dec, le32dec, be64enc, le64enc, be64dec, le64dec],,,
		[#include <sys/endian.h>])

AC_CHECK_DECLS([fstatvfs],,, [#include <sys/statvfs.h>])

AC_CHECK_DECLS([setgroupent, setpassent],,, [
#include <sys/types.h>
#include <grp.h>
#include <pwd.h>
])

# regcomp() and regexec() are also names of functions in the old V8
# regexp package.  To avoid them, we need to find out who has regfree().

dnl # Cygwin: We *MUST* look at -lregex *before* the "no libs" condition.
dnl # Thus AC_CHECK_LIB(regex...) comes first, and AC_SEARCHLIBS next.
AC_CHECK_LIB(regex, regfree)
AC_SEARCH_LIBS(regfree, rx posix)

AC_CHECK_LIB(rt, clock_gettime)

AC_CHECK_FUNCS(fparseln, [
    AC_MSG_CHECKING(if fparseln seems to work)
    AC_RUN_IFELSE(
        [AC_LANG_SOURCE([[
#define _NETBSD_SOURCE
#include <stdio.h>
#include <stdlib.h>
#define CONFTEST	"conftest.fparseln"
#define COMMENT		'#'
int
main(void)
{
	static const char delim[3] = { '\0', '\0', COMMENT };
	FILE *fp;
	char *ptr;
	fp = fopen(CONFTEST, "w+");
	if (fp != NULL) {
		unlink(CONFTEST);
		ungetc(COMMENT, fp);
		ptr = fparseln(fp, NULL, NULL, delim,
		    FPARSELN_UNESCALL);
		fclose(fp);
		if (ptr == NULL)
			exit(0);
	}
	exit(1);
}
        ]])],
        [AC_MSG_RESULT(yes)],
        [AC_MSG_RESULT(no)
         AC_DEFINE(BROKEN_FPARSELN, 1,
            [Define to 1 if your 'fparseln' function is broken.])],
        [AC_MSG_WARN([cross compiling: not checking farseln])]
    )
])

dnl
dnl Set per-warning CC_* variables if supported by HOST_CC.
dnl

dnl clang needs to fail if given an unknown -WWARN.
cc_fail_unknown=
AX_CHECK_COMPILE_FLAG([-Werror=unknown-warning-option],
 [AS_VAR_APPEND([cc_fail_unknown], [-Werror=unknown-warning-option])])

dnl NB_CC_FLAG(FLAG)
dnl	Determine if HOST_CC supports FLAG, and
dnl	sets output variable VAR (derived from FLAG)
dnl	to FLAG if it is supported.
dnl
AC_DEFUN([NB_CC_FLAG], [dnl
m4_pushdef([NB_FLAG], [$1])
dnl gcc ignores unknown -Wno-WARN but will fail unknown equivalent -WWARN.
m4_pushdef([NB_WFLAG], m4_bpatsubst(NB_FLAG, [^-Wno-], [-W]))
m4_pushdef([NB_VAR], [CC]m4_translit(NB_FLAG, [-=a-z], [__A-Z]))
AX_CHECK_COMPILE_FLAG(NB_WFLAG, [AS_VAR_SET(NB_VAR,NB_FLAG)], [], [$cc_fail_unknown])
AC_SUBST(NB_VAR)
m4_append([NB_CC_FLAG_VARS], NB_VAR, [ ])
m4_popdef([NB_FLAG])
m4_popdef([NB_WFLAG])
m4_popdef([NB_VAR])
]) dnl NB_CC_FLAG

dnl Disable use of pre-compiled headers on Darwin.
NB_CC_FLAG([-no-cpp-precomp])

dnl Detect HOST_CC support for <bsd.own.mk> CC_* warnings
NB_CC_FLAG([-Wno-address-of-packed-member])
NB_CC_FLAG([-Wno-cast-function-type])
NB_CC_FLAG([-Wno-error=address-of-packed-member])
NB_CC_FLAG([-Wno-format-overflow])
NB_CC_FLAG([-Wno-format-truncation])
NB_CC_FLAG([-Wno-implicit-fallthrough])
NB_CC_FLAG([-Wno-maybe-uninitialized])
NB_CC_FLAG([-Wno-return-local-addr])
NB_CC_FLAG([-Wno-stringop-overflow])
NB_CC_FLAG([-Wno-stringop-truncation])

AC_OUTPUT()

dnl Display results
dnl
AC_MSG_NOTICE([============= Configuration results =============])
m4_foreach_w([NB_VAR], [CC LIBS ]NB_CC_FLAG_VARS, [dnl
AC_MSG_NOTICE(m4_format([%-40s],NB_VAR)[$NB_VAR])
])
AC_MSG_NOTICE([================================================])