dnl
dnl Configuration script for Mini-XML, a small XML-like file parsing library.
dnl
dnl https://www.msweet.org/mxml
dnl
dnl Copyright © 2003-2019 by Michael R Sweet.
dnl
dnl Licensed under Apache License v2.0.  See the file "LICENSE" for more
dnl information.
dnl

dnl Package name and version...
AC_INIT([Mini-XML], [3.0], [https://github.com/michaelrsweet/mxml/issues], [mxml], [https://michaelrsweet.github.io/mxml])

dnl This line is provided to ensure that you don't run the autoheader program
dnl against this project.  Doing so is completely unsupported and WILL cause
dnl problems!
AH_TOP([#error "Somebody ran autoheader on this project which is unsupported and WILL cause problems."])

dnl Get the build and host platforms and split the host_os value
AC_CANONICAL_BUILD
AC_CANONICAL_HOST

[host_os_name=`echo $host_os | sed -e '1,$s/[0-9.]*$//g'`]
[host_os_version=`echo $host_os | sed -e '1,$s/^[^0-9.]*//g'`]

dnl Set the name of the config header file...
AC_CONFIG_HEADER(config.h)

dnl Version number...
VERSION="AC_PACKAGE_VERSION"
AC_SUBST(VERSION)
AC_DEFINE_UNQUOTED(MXML_VERSION, "Mini-XML v$VERSION")

dnl Clear default debugging options and set normal optimization by
dnl default unless the user asks for debugging specifically.
CFLAGS="${CFLAGS:=}"
CXXFLAGS="${CXXFLAGS:=}"
LDFLAGS="${LDFLAGS:=}"
AC_SUBST(LDFLAGS)

AC_ARG_WITH(ansi, [  --with-ansi             set full ANSI C mode, default=no],
	use_ansi="$withval",
	use_ansi="no")

AC_ARG_WITH(archflags, [  --with-archflags        set additional architecture flags, default=none],
	ARCHFLAGS="$withval",
	ARCHFLAGS="")
AC_SUBST(ARCHFLAGS)

AC_ARG_WITH(optim,   [  --with-optim            set additional optimization flags, default=none],
	OPTIM="$withval",
	OPTIM="")
AC_SUBST(OPTIM)

AC_ARG_ENABLE(debug, [  --enable-debug          turn on debugging, default=no],
if eval "test x$enable_debug = xyes"; then
 	OPTIM="$OPTIM -g"
fi)

AC_ARG_WITH(docdir, [  --with-docdir           set directory for documentation, default=${prefix}/share/doc/mxml],
	docdir="$withval",
	docdir="NONE")

AC_SUBST(docdir)

AC_ARG_WITH(vsnprintf, [  --with-vsnprintf        use vsnprintf emulation functions, default=auto],
	use_vsnprintf="$withval",
	use_vsnprintf="no")

dnl Checks for programs...
AC_PROG_CC
AC_PROG_CXX
AC_PROG_INSTALL
if test "$INSTALL" = "$ac_install_sh"; then
	# Use full path to install-sh script...
	INSTALL="`pwd`/install-sh -c"
fi
AC_PROG_RANLIB
AC_CHECK_TOOL(AR,ar)
AC_PATH_PROG(CP,cp)
AC_PATH_PROG(LN,ln)
AC_PATH_PROG(MKDIR,mkdir)
AC_PATH_PROG(RM,rm)

dnl Flags for "ar" command...
case "$host_os_name" in
        darwin* | *bsd)
                ARFLAGS="-rcv"
                ;;
        *)
                ARFLAGS="crvs"
                ;;
esac

AC_SUBST(ARFLAGS)

dnl Inline functions...
AC_C_INLINE

dnl Checks for string functions.
if test "x$use_ansi" != xyes; then
	AC_CHECK_FUNCS(strdup strlcat strlcpy)
fi

if test "x$use_vsnprintf" != xyes; then
	AC_CHECK_FUNCS(snprintf vasprintf vsnprintf)
fi

dnl Check for "long long" support...
AC_CACHE_CHECK(for long long int, ac_cv_c_long_long,
	[if test "$GCC" = yes; then
		ac_cv_c_long_long=yes
	else
		AC_TRY_COMPILE(,[long long int i;],
			ac_cv_c_long_long=yes,
			ac_cv_c_long_long=no)
	fi])

if test $ac_cv_c_long_long = yes; then
	AC_DEFINE(HAVE_LONG_LONG)
fi

dnl Threading support
AC_ARG_ENABLE(threads, [  --enable-threads        enable multi-threading support])

have_pthread=no
PTHREAD_FLAGS=""
PTHREAD_LIBS=""

if test "x$enable_threads" != xno; then
	AC_CHECK_HEADER(pthread.h, AC_DEFINE(HAVE_PTHREAD_H))

	if test x$ac_cv_header_pthread_h = xyes; then
		dnl Check various threading options for the platforms we support
		for flag in -lpthreads -lpthread -pthread; do
        		AC_MSG_CHECKING([for pthread_create using $flag])
			SAVELIBS="$LIBS"
			LIBS="$flag $LIBS"
        		AC_TRY_LINK([#include <pthread.h>],
				[pthread_create(0, 0, 0, 0);],
        			have_pthread=yes)
        		AC_MSG_RESULT([$have_pthread])
			LIBS="$SAVELIBS"

			if test $have_pthread = yes; then
				PTHREAD_FLAGS="-D_THREAD_SAFE -D_REENTRANT"
				PTHREAD_LIBS="$flag"

				# Solaris requires -D_POSIX_PTHREAD_SEMANTICS to
				# be POSIX-compliant... :(
				case "$host_os_name" in
					sunos)
					PTHREAD_FLAGS="$PTHREAD_FLAGS -D_POSIX_PTHREAD_SEMANTICS"
					;;
				esac
				break
			fi
		done
	fi
fi

AC_SUBST(PTHREAD_FLAGS)
AC_SUBST(PTHREAD_LIBS)

dnl Shared library support...
DSO="${DSO:=:}"
DSOFLAGS="${DSOFLAGS:=}"

AC_ARG_ENABLE(shared, [  --enable-shared         turn on shared libraries, default=no])

if test x$enable_shared != xno; then
	AC_MSG_CHECKING(for shared library support)
	PICFLAG=1

	case "$host_os_name" in
		sunos | unix_s)
			AC_MSG_RESULT(yes)
			LIBMXML="libmxml.so.1.6"
			DSO="\$(CC)"
			DSOFLAGS="$DSOFLAGS -Wl,-h,libmxml.so.1 -G -R\$(libdir) \$(OPTIM)"
			LDFLAGS="$LDFLAGS -R\$(libdir)"
                	;;

		linux*)
			AC_MSG_RESULT(yes)
			LIBMXML="libmxml.so.1.6"
			DSO="\$(CC)"
			DSOFLAGS="$DSOFLAGS -Wl,-soname,libmxml.so.1 -shared \$(OPTIM)"
			;;

		osf | gnu)
			AC_MSG_RESULT(yes)
			LIBMXML="libmxml.so.1.6"
			DSO="\$(CC)"
			DSOFLAGS="$DSOFLAGS -Wl,-soname,libmxml.so.1,-rpath,\$(libdir) -shared \$(OPTIM)"
                        LDFLAGS="$LDFLAGS -Wl,-rpath,\$(libdir)"
			;;

		*bsd)
			AC_MSG_RESULT(yes)
			LIBMXML="libmxml.so.1.6"
			DSO="\$(CC)"
			DSOFLAGS="$DSOFLAGS -Wl,-soname,libmxml.so.1,-R\$(libdir) -shared \$(OPTIM)"
			LDFLAGS="$LDFLAGS -Wl,-R\$(libdir)"
                        ;;

		darwin)
			AC_MSG_RESULT(yes)
			LIBMXML="libmxml.1.dylib"
			DSO="\$(CC)"
			DSOFLAGS="$DSOFLAGS \$(RC_CFLAGS) -dynamiclib -lc"
			;;

                mingw)
                        AC_MSG_RESULT(yes)
                        LIBMXML="mxml1.dll"
                        DSO="\$(CC)"
                        DSOFLAGS="$DSOFLAGS -shared -Wl,--out-implib,libmxml1.a,--no-undefined,--enable-runtime-pseudo-reloc"
                        ;;

		*)
			AC_MSG_RESULT(no)
			AC_MSG_WARN(shared libraries not supported on this platform.)
			PICFLAG=0
			LIBMXML="libmxml.a"
			;;
	esac
else
	PICFLAG=0
	LIBMXML="libmxml.a"
fi

AC_SUBST(DSO)
AC_SUBST(DSOFLAGS)
AC_SUBST(LIBMXML)
AC_SUBST(PICFLAG)

dnl Add -Wall for GCC...
if test -n "$GCC"; then
	CFLAGS="-Wall -D_GNU_SOURCE $CFLAGS"

	if test "x$OPTIM" = x; then
		OPTIM="-Os -g"
	fi

	if test "x$use_ansi" = xyes; then
		CFLAGS="-ansi -pedantic $CFLAGS"
	fi

	if test $PICFLAG = 1 -a "$host_os_name" != aix; then
    		OPTIM="-fPIC $OPTIM"
	fi
else
	case "$host_os_name" in
		hp-ux)
			CFLAGS="-Ae $CFLAGS"

			if test "x$OPTIM" = x; then
				OPTIM="-O"
			fi

			OPTIM="+DAportable $OPTIM"

			if test $PICFLAG = 1; then
				OPTIM="+z $OPTIM"
			fi
			;;

		unix_svr | sunos)
			if test "x$OPTIM" = x; then
				OPTIM="-O"
			fi

			if test $PICFLAG = 1; then
				OPTIM="-KPIC $OPTIM"
			fi
			;;

		*)
			if test "x$OPTIM" = x; then
				OPTIM="-O"
			fi
			;;
	esac
fi

dnl Determine whether we are cross-compiling...
if test "$build" = "$host"; then
	TARGETS="ALLTARGETS"
else
	TARGETS="CROSSTARGETS"
fi
AC_SUBST(TARGETS)

dnl Fix "prefix" variable if it hasn't been specified...
if test "$prefix" = "NONE"; then
	prefix="/usr/local"
fi

dnl Fix "exec_prefix" variable if it hasn't been specified...
if test "$exec_prefix" = "NONE"; then
	exec_prefix="$prefix"
fi

dnl Fix "docdir" variable if it hasn't been specified...
if test "$docdir" = "NONE"; then
	docdir="$datadir/doc/mxml"
fi

dnl Fix "mandir" variable if it hasn't been specified...
if test "$mandir" = "\${prefix}/man" -a "$prefix" = "/usr"; then
	case "$host_os_name" in
        	*bsd | darwin | linux*)
        		# *BSD, Darwin (macOS), and Linux
        		mandir="/usr/share/man"
        		;;
        	irix)
        		# SGI IRIX
        		mandir="/usr/share/catman/u_man"
        		;;
        	*)
        		# All others
        		mandir="/usr/man"
        		;;
	esac
fi

dnl pkg-config stuff...
if test "$includedir" != /usr/include; then
	PC_CFLAGS="-I$includedir"
else
	PC_CFLAGS=""
fi

if test "$libdir" != /usr/lib; then
	PC_LIBS="-L$libdir -lmxml"
else
	PC_LIBS="-lmxml"
fi

AC_SUBST(PC_CFLAGS)
AC_SUBST(PC_LIBS)

dnl Output the makefile, etc...
AC_OUTPUT(Makefile mxml.pc)
