configure.in

让你了解Unix进程间的通信是如何实现的

dnl
dnl autoconf script for UNP 2/e Volume 2 source code.
dnl Process this file with autoconf to produce a configure script.
dnl
dnl The end result of running configure is the "config.h" file and the
dnl "Make.defines" file in the current directory.  These two files are
dnl created from the "config.h.in" and "Make.defines.in" files in the
dnl current directory.
dnl
dnl The header "unpipc.h" that is in every source directory then does a
dnl #include "../config.h" and the Makefile in each source directory
dnl then does a include of ../Make.defines.
dnl
AC_INIT(lib/unpipc.h)
AC_CANONICAL_HOST
AC_CONFIG_HEADER(config.h)

dnl The following cpu_vendor_os string goes into config.h.
dnl
AC_DEFINE_UNQUOTED(CPU_VENDOR_OS, "$host")

dnl ##################################################################
dnl Checks for programs.
dnl

dnl Some system-specific stuff ...
dnl Some operating systems require additional flags in order to get all
dnl the definitions that we're looking for in some system headers.
dnl The configure script uses both CFLAGS and CPPFLAGS when compiling.
case "$host_os" in
*aix*)		CPPFLAGS="$CPPFLAGS -D_ALL_SOURCE" ;;
*hpux*)		CPPFLAGS="$CPPFLAGS -D_HPUX_SOURCE" ;;
*osf*)		CPPFLAGS="$CPPFLAGS -D_SOCKADDR_LEN" ;;
*solaris2*)	CPPFLAGS="$CPPFLAGS -D__STDC__ -D__EXTENSIONS__" ;;
esac

AC_PROG_CC
AC_PROG_RANLIB

dnl ##################################################################
dnl Checks for libraries.
dnl The order of these tests is the *reverse* order of the libraries in
dnl the LIBS variable that is constructed: each new one gets prepended,
dnl not appended.
dnl
dnl We are building two strings here; something like:
dnl	LIBS="-lresolv -lsocket -lnsl -lpthread"
dnl	LIBUNPIPC="./libunpipc.a"
dnl
dnl If a threads library is found, need to update CFLAGS too.
dnl
AC_CHECK_LIB(pthread, pthread_key_create)
if test "$ac_cv_lib_pthread_pthread_key_create" = yes ; then
   CFLAGS="$CFLAGS -D_REENTRANT"
else
   AC_CHECK_LIB(pthreads, pthread_key_create)
   if test "$ac_cv_lib_pthreads_pthread_key_create" = yes ; then
      CFLAGS="$CFLAGS -D_REENTRANT"
   fi
fi

dnl Solaris requires -lposix4.
dnl
AC_CHECK_LIB(posix4, mq_open)

dnl Digital Unix 4.0B requires -lrt
dnl
AC_CHECK_LIB(rt, mq_open)

dnl We now need to check for our own libraries, but we cannot prepend
dnl them to the LIBS variable, as that variable is used when compiling
dnl programs later in this script, and that would mess things up.
dnl
dnl If the user has a file named $HOME/libunpipc.a, then use it.
dnl Else store our library in current directory.
dnl I use this because my source directory is NFS mounted from my various
dnl systems, but I have a unique home directory on each system.
dnl
AC_MSG_CHECKING(for $HOME/libunpipc.a)
if test -f $HOME/libunpipc.a ; then
	AC_MSG_RESULT(yes)
	LIBUNPIPC="$HOME/libunpipc.a"
	LIBUNPIPC_NAME=$HOME/libunpipc.a
else
	AC_MSG_RESULT(no, using ./libunpipc.a)
	LIBUNPIPC="../libunpipc.a"
	LIBUNPIPC_NAME=../libunpipc.a
fi

dnl Check for any system-specific libraries needed for Sun RPC.
dnl
AC_MSG_CHECKING(for /usr/lib/libnsl.so)
if test -f /usr/lib/libnsl.so ; then
	AC_MSG_RESULT(yes)
	LIBS_RPC="-lnsl"
else
	AC_MSG_RESULT(no)
fi

dnl ##################################################################
dnl Checks for header files.
dnl
dnl The list of headers in the AC_CHECK_HEADERS macro is the same as in
dnl our "unpipc.h" header.  <sys/sysctl.h> is not #included by "unpipc.h",
dnl but used in "lib/wrapunix.c".
dnl
AC_HEADER_STDC
AC_CHECK_HEADERS(sys/types.h sys/time.h time.h errno.h fcntl.h limits.h signal.h stdio.h stdlib.h string.h sys/stat.h unistd.h sys/wait.h sys/ipc.h sys/msg.h sys/sem.h sys/shm.h mqueue.h semaphore.h sys/mman.h sys/select.h poll.h stropts.h strings.h sys/ioctl.h sys/filio.h pthread.h door.h rpc/rpc.h sys/sysctl.h)

dnl ##################################################################
dnl Checks for typedefs.
dnl
dnl We use our own AC_UNP_CHECK_TYPE macro, instead of AC_CHECK_TYPE,
dnl to #include more headers.  Our macro is defined in "aclocal.m4".
dnl
AC_HEADER_TIME
AC_UNP_CHECK_TYPE(uint8_t, unsigned char)
AC_UNP_CHECK_TYPE(int16_t, short)
AC_UNP_CHECK_TYPE(uint16_t, unsigned short)
AC_UNP_CHECK_TYPE(int32_t, int)
AC_UNP_CHECK_TYPE(uint32_t, unsigned int)
AC_UNP_CHECK_TYPE(size_t, unsigned int)
AC_UNP_CHECK_TYPE(ssize_t, int)

dnl ##################################################################
dnl Check for function prototypes in headers.
dnl AC_CHECK_FUNC_PROTO is our own macro in "aclocal.m4".
dnl
AC_CHECK_FUNC_PROTO(gethostname, unistd.h)
AC_CHECK_FUNC_PROTO(getrusage, sys/resource.h)
AC_CHECK_FUNC_PROTO(isfdtype, sys/stat.h)
AC_CHECK_FUNC_PROTO(pselect, sys/select.h)
AC_CHECK_FUNC_PROTO(shm_open, sys/mman.h)

dnl Cannot get the above to work under Solaris 2.6.  It is the stupid
dnl POSIX_C_SOURCE feature test macro that hides the prototypes.
dnl Following tries to get around that.
if test $ac_cv_lib_posix4_mq_open = yes ; then
	AC_CHECK_LIB(posix4, shm_open)
	if test $ac_cv_lib_posix4_shm_open = yes ; then
		AC_DEFINE(HAVE_SHM_OPEN_PROTO)
	fi
fi

AC_CHECK_FUNC_PROTO(snprintf, stdio.h)
AC_CHECK_FUNC_PROTO(thr_setconcurrency, thread.h)

dnl ##################################################################
dnl Check for structure definitions.
dnl
AC_CACHE_CHECK(for siginfo_t{}, ac_cv_have_siginfo_t_struct,
	AC_EGREP_HEADER(siginfo_t, signal.h,
		ac_cv_have_siginfo_t_struct=yes,
		ac_cv_have_siginfo_t_struct=no))
if test $ac_cv_have_siginfo_t_struct = yes ; then
	AC_DEFINE(HAVE_SIGINFO_T_STRUCT)
fi

AC_CACHE_CHECK(for timespec{}, ac_cv_have_timespec_struct,
	AC_EGREP_HEADER(timespec, time.h,
		ac_cv_have_timespec_struct=yes,
		ac_cv_have_timespec_struct=no))
if test $ac_cv_have_timespec_struct = yes ; then
	AC_DEFINE(HAVE_TIMESPEC_STRUCT)
fi

dnl The following union is not supposed to be defined in <sys/sem.h>
dnl but some implementations do defint it (*BSD and Linux).

AC_CACHE_CHECK(for union semun, ac_cv_have_semun_union,
	AC_EGREP_HEADER(semun, sys/sem.h,
		ac_cv_have_semun_union=yes,
		ac_cv_have_semun_union=no))
if test $ac_cv_have_semun_union = yes ; then
	AC_DEFINE(HAVE_SEMUN_UNION)
fi
dnl ##################################################################
dnl Check for devices.
dnl
AC_MSG_CHECKING(for /dev/zero)
if test -r /dev/zero ; then
	AC_DEFINE(HAVE_DEV_ZERO)
	AC_MSG_RESULT(yes)
else
	AC_MSG_RESULT(no)
fi
dnl ##################################################################
dnl Check whether rpcgen supports -C (newer TI-RPC version).
dnl
AC_MSG_CHECKING(whether rpcgen supports -C option)
echo "const foo = 5;" > /tmp/rpcgen.$$.x
if rpcgen -C -c /tmp/rpcgen.$$.x > /dev/null 2> /dev/null ; then
	AC_DEFINE(RPCGEN_ANSIC)
	RPCGEN_OPTS="-C"
	AC_MSG_RESULT(yes)
else
	RPCGEN_OPTS=
	AC_MSG_RESULT(no)
fi
rm -f /tmp/rpcgen.$$.x

dnl ##################################################################
dnl Checks for library functions.
dnl
AC_CHECK_FUNCS(bzero)
AC_CHECK_FUNCS(fattach)
AC_CHECK_FUNCS(isfdtype)
AC_CHECK_FUNCS(poll)
AC_CHECK_FUNCS(pselect)
AC_CHECK_FUNCS(sigwait)
AC_CHECK_FUNCS(snprintf)
AC_CHECK_FUNCS(valloc)
AC_CHECK_FUNCS(vsnprintf)

dnl ##################################################################
dnl Check for system services.

dnl ##################################################################
dnl Build the list of object files to build from the source files in
dnl the lib/ directory.
dnl
LIB_OBJS=
LIB_OBJS="$LIB_OBJS daemon_inetd.o"
LIB_OBJS="$LIB_OBJS daemon_init.o"
LIB_OBJS="$LIB_OBJS error.o"
LIB_OBJS="$LIB_OBJS gf_time.o"
if test "$ac_cv_func_isfdtype" = no ; then
   LIB_OBJS="$LIB_OBJS isfdtype.o"
fi
LIB_OBJS="$LIB_OBJS lock_reg.o"
LIB_OBJS="$LIB_OBJS lock_test.o"
if test "$ac_cv_func_pselect" = no ; then
   LIB_OBJS="$LIB_OBJS pselect.o"
fi
LIB_OBJS="$LIB_OBJS my_shm.o"
LIB_OBJS="$LIB_OBJS px_ipc_name.o"
LIB_OBJS="$LIB_OBJS readable_timeo.o"
LIB_OBJS="$LIB_OBJS readline.o"
LIB_OBJS="$LIB_OBJS readn.o"
LIB_OBJS="$LIB_OBJS set_concurrency.o"
LIB_OBJS="$LIB_OBJS set_nonblock.o"
LIB_OBJS="$LIB_OBJS signal.o"
LIB_OBJS="$LIB_OBJS signal_intr.o"
LIB_OBJS="$LIB_OBJS sleep_us.o"
if test $ac_cv_have_siginfo_t_struct = yes ; then
    LIB_OBJS="$LIB_OBJS signal_rt.o"
    LIB_OBJS="$LIB_OBJS signal_rt_intr.o"
fi
if test "$ac_cv_func_snprintf" = no ; then
   LIB_OBJS="$LIB_OBJS snprintf.o"
fi
LIB_OBJS="$LIB_OBJS timing.o"
LIB_OBJS="$LIB_OBJS tv_sub.o"
if test "$ac_cv_header_door_h" = yes ; then
   LIB_OBJS="$LIB_OBJS wrapdoor.o"
fi
if test "$ac_cv_header_pthread_h" = yes ; then
   LIB_OBJS="$LIB_OBJS wrappthread.o"
fi
if test "$ac_cv_header_rpc_rpc_h" = yes ; then
   LIB_OBJS="$LIB_OBJS wrapsunrpc.o"
fi
LIB_OBJS="$LIB_OBJS wrapstdio.o"
LIB_OBJS="$LIB_OBJS wrapunix.o"
LIB_OBJS="$LIB_OBJS writable_timeo.o"
LIB_OBJS="$LIB_OBJS writen.o"

dnl Now make certain that when configure is run, AC_OUTPUT replaces these
dnl strings that we built in shell variables in the output files that
dnl it generates.
dnl
AC_SUBST(LIB_OBJS)

AC_SUBST(LIBS_RPC)
AC_SUBST(RPCGEN_OPTS)

AC_SUBST(LIBUNPIPC)

AC_SUBST(LIBUNPIPC_NAME)

dnl ##################################################################
dnl Now that we're doing compiling, modify CFLAGS.
dnl
dnl If the directory $HOME/doc/unpv22e/src/include exists, the user can
dnl place modified copies of the system's headers in there, with the
dnl function prototypes corrected, as per Posix and X/Open.  Lots of
dnl system headers today are missing const qualifiers, they have char*
dnl instead of void*, and so on.
dnl
AC_MSG_CHECKING(for -I$HOME/doc/unpv22e/src/include)
if test -d $HOME/doc/unpv22e/src/include ; then
	CFLAGS="$CFLAGS -I$HOME/doc/unpv22e/src/include"
	AC_MSG_RESULT(yes)
else
	AC_MSG_RESULT(no)
fi

dnl If the compiler is gcc, enable all warnings.  Main purpose is to
dnl catch any function call where the function has not been prototyped.
dnl
if test "$ac_cv_prog_gcc" = yes; then
   CFLAGS="$CFLAGS -Wall"
fi

dnl Some system-specific stuff ...
dnl Some operating systems require additional flags in order to get all
dnl the definitions that we're looking for in some system headers.
case "$host_os" in
*aix*)		CFLAGS="$CFLAGS -D_ALL_SOURCE" ;;
*hpux*)		CFLAGS="$CFLAGS -D_HPUX_SOURCE" ;;
*osf*)		CFLAGS="$CFLAGS -D_SOCKADDR_LEN" ;;
*solaris*)	if test "$ac_cv_prog_gcc" = yes; then
		   CFLAGS="$CFLAGS -D__EXTENSIONS__"
		else
		   CFLAGS="$CFLAGS -D__STDC__"
		fi
		AC_DEFINE(POSIX_IPC_PREFIX, "/")
		;;
esac

dnl ##################################################################
dnl We also create a "Makefile" but it is not used for much.
dnl
AC_OUTPUT(Makefile Make.defines)

dnl
dnl If a directory exists whose name equals the host
dnl (e.g., sparc-sun-solaris2.6), then save the three files that we
dnl create in that directory also.
dnl Quick and dirty to be able to NFS mount this directory on different
dnl systems and move quickly between the systems, without having to
dnl rerun configure each time.
dnl The "myconfig" script in this directory does the move.
dnl
if test -d "$host" ; then
   cp -p config.h config.cache config.status Makefile Make.defines $host
   echo "saving copies in $host/"
fi