[catagits/fcgi2.git] / acinclude.m4

dnl     $Id: acinclude.m4,v 1.2 2001/12/21 03:12:50 robs Exp $

AC_DEFUN([FCGI_COMMON_CHECKS], [
    AC_CHECK_TYPE([ssize_t], [int]) 

    AC_MSG_CHECKING([for sun_len in sys/un.h])
    AC_EGREP_HEADER([sun_len], [sys/un.h],
	[AC_MSG_RESULT([yes])
	 AC_DEFINE([HAVE_SOCKADDR_UN_SUN_LEN], [1],
	   [Define if sockaddr_un in sys/un.h contains a sun_len component])],
	AC_MSG_RESULT([no]))

    AC_MSG_CHECKING([for fpos_t in stdio.h])
    AC_EGREP_HEADER([fpos_t], [stdio.h],
	[AC_MSG_RESULT([yes])
	 AC_DEFINE([HAVE_FPOS], [1], 
	    [Define if the fpos_t typedef is in stdio.h])],
	AC_MSG_RESULT([no]))

    AC_CHECK_HEADERS([sys/socket.h netdb.h netinet/in.h arpa/inet.h])
    AC_CHECK_HEADERS([sys/time.h limits.h sys/param.h unistd.h])

    AC_MSG_CHECKING([for a fileno() prototype in stdio.h])
    AC_EGREP_HEADER([fileno], [stdio.h], 
	    [AC_MSG_RESULT([yes]) 
	     AC_DEFINE([HAVE_FILENO_PROTO], [1], 
		   [Define if there's a fileno() prototype in stdio.h])],
	    AC_MSG_RESULT([no]))

    if test "$HAVE_SYS_SOCKET_H"; then
	AC_MSG_CHECKING([for socklen_t in sys/socket.h])
	AC_EGREP_HEADER([socklen_t], [sys/socket.h],
	    [AC_MSG_RESULT([yes])
	     AC_DEFINE([HAVE_SOCKLEN], [1],
			       [Define if the socklen_t typedef is in sys/socket.h])],
	   AC_MSG_RESULT([no]))
    fi

    #--------------------------------------------------------------------
    #  Do we need cross-process locking on this platform?
    #--------------------------------------------------------------------
    AC_MSG_CHECKING([whether cross-process locking is required by accept()])
    case "`uname -sr`" in
	IRIX\ 5.* | SunOS\ 5.* | UNIX_System_V\ 4.0)	
		    AC_MSG_RESULT([yes])
		    AC_DEFINE([USE_LOCKING], [1], 
		      [Define if cross-process locking is required by accept()])
	    ;;
	*)
		    AC_MSG_RESULT([no])
		;;
    esac

    #--------------------------------------------------------------------
    #  Does va_arg(arg, long double) crash the compiler?
    #  hpux 9.04 compiler does and so does Stratus FTX (uses HP's compiler)
    #--------------------------------------------------------------------
    AC_MSG_CHECKING([whether va_arg(arg, long double) crashes the compiler])
    AC_TRY_COMPILE([#include <stdarg.h>],
       [long double lDblArg; va_list arg; lDblArg = va_arg(arg, long double);],
       AC_MSG_RESULT([no]),
       [AC_MSG_RESULT([yes])
	AC_DEFINE([HAVE_VA_ARG_LONG_DOUBLE_BUG], [1],
	      [Define if va_arg(arg, long double) crashes the compiler])])

    AC_C_CONST 
])


dnl @synopsis ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
dnl
dnl This macro figures out how to build C programs using POSIX
dnl threads.  It sets the PTHREAD_LIBS output variable to the threads
dnl library and linker flags, and the PTHREAD_CFLAGS output variable
dnl to any special C compiler flags that are needed.  (The user can also
dnl force certain compiler flags/libs to be tested by setting these
dnl environment variables.)
dnl
dnl Also sets PTHREAD_CC to any special C compiler that is needed for
dnl multi-threaded programs (defaults to the value of CC otherwise).
dnl (This is necessary on AIX to use the special cc_r compiler alias.)
dnl
dnl If you are only building threads programs, you may wish to
dnl use these variables in your default LIBS, CFLAGS, and CC:
dnl
dnl        LIBS="$PTHREAD_LIBS $LIBS"
dnl        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
dnl        CC="$PTHREAD_CC"
dnl
dnl In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute
dnl constant has a nonstandard name, defines PTHREAD_CREATE_JOINABLE
dnl to that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
dnl
dnl ACTION-IF-FOUND is a list of shell commands to run if a threads
dnl library is found, and ACTION-IF-NOT-FOUND is a list of commands
dnl to run it if it is not found.  If ACTION-IF-FOUND is not specified,
dnl the default action will define HAVE_PTHREAD.
dnl
dnl Please let the authors know if this macro fails on any platform,
dnl or if you have any other suggestions or comments.  This macro was
dnl based on work by SGJ on autoconf scripts for FFTW (www.fftw.org)
dnl (with help from M. Frigo), as well as ac_pthread and hb_pthread
dnl macros posted by AFC to the autoconf macro repository.  We are also
dnl grateful for the helpful feedback of numerous users.
dnl
dnl @version $Id: acinclude.m4,v 1.2 2001/12/21 03:12:50 robs Exp $
dnl @author Steven G. Johnson <stevenj@alum.mit.edu> and Alejandro Forero Cuervo <bachue@bachue.com>

AC_DEFUN([ACX_PTHREAD], [
AC_REQUIRE([AC_CANONICAL_HOST])
acx_pthread_ok=no

# First, check if the POSIX threads header, pthread.h, is available.
# If it isn't, don't bother looking for the threads libraries.
AC_CHECK_HEADER(pthread.h, , acx_pthread_ok=noheader)

# We must check for the threads library under a number of different
# names; the ordering is very important because some systems
# (e.g. DEC) have both -lpthread and -lpthreads, where one of the
# libraries is broken (non-POSIX).

# First of all, check if the user has set any of the PTHREAD_LIBS,
# etcetera environment variables, and if threads linking works using
# them:
if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
        save_CFLAGS="$CFLAGS"
        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
        save_LIBS="$LIBS"
        LIBS="$PTHREAD_LIBS $LIBS"
        AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS])
        AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes)
        AC_MSG_RESULT($acx_pthread_ok)
        if test x"$acx_pthread_ok" = xno; then
                PTHREAD_LIBS=""
                PTHREAD_CFLAGS=""
        fi
        LIBS="$save_LIBS"
        CFLAGS="$save_CFLAGS"
fi

# Create a list of thread flags to try.  Items starting with a "-" are
# C compiler flags, and other items are library names, except for "none"
# which indicates that we try without any flags at all.

acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt"

# The ordering *is* (sometimes) important.  Some notes on the
# individual items follow:

# pthreads: AIX (must check this before -lpthread)
# none: in case threads are in libc; should be tried before -Kthread and
#       other compiler flags to prevent continual compiler warnings
# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
# -pthreads: Solaris/gcc
# -mthreads: Mingw32/gcc, Lynx/gcc
# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
#      doesn't hurt to check since this sometimes defines pthreads too;
#      also defines -D_REENTRANT)
# pthread: Linux, etcetera
# --thread-safe: KAI C++

case "${host_cpu}-${host_os}" in
        *solaris*)

        # On Solaris (at least, for some versions), libc contains stubbed
        # (non-functional) versions of the pthreads routines, so link-based
        # tests will erroneously succeed.  (We need to link with -pthread or
        # -lpthread.)  (The stubs are missing pthread_cleanup_push, or rather
        # a function called by this macro, so we could check for that, but
        # who knows whether they'll stub that too in a future libc.)  So,
        # we'll just look for -pthreads and -lpthread first:

        acx_pthread_flags="-pthread -pthreads pthread -mt $acx_pthread_flags"
        ;;
esac

if test x"$acx_pthread_ok" = xno; then
for flag in $acx_pthread_flags; do

        case $flag in
                none)
                AC_MSG_CHECKING([whether pthreads work without any flags])
                ;;

                -*)
                AC_MSG_CHECKING([whether pthreads work with $flag])
                PTHREAD_CFLAGS="$flag"
                ;;

                *)
                AC_MSG_CHECKING([for the pthreads library -l$flag])
                PTHREAD_LIBS="-l$flag"
                ;;
        esac

        save_LIBS="$LIBS"
        save_CFLAGS="$CFLAGS"
        LIBS="$PTHREAD_LIBS $LIBS"
        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"

        # Check for various functions.  We must include pthread.h,
        # since some functions may be macros.  (On the Sequent, we
        # need a special flag -Kthread to make this header compile.)
        # We check for pthread_join because it is in -lpthread on IRIX
        # while pthread_create is in libc.  We check for pthread_attr_init
        # due to DEC craziness with -lpthreads.  We check for
        # pthread_cleanup_push because it is one of the few pthread
        # functions on Solaris that doesn't have a non-functional libc stub.
        # We try pthread_create on general principles.
        AC_TRY_LINK([#include <pthread.h>],
                    [pthread_t th; pthread_join(th, 0);
                     pthread_attr_init(0); pthread_cleanup_push(0, 0);
                     pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
                    [acx_pthread_ok=yes])

        LIBS="$save_LIBS"
        CFLAGS="$save_CFLAGS"

        AC_MSG_RESULT($acx_pthread_ok)
        if test "x$acx_pthread_ok" = xyes; then
                break;
        fi

        PTHREAD_LIBS=""
        PTHREAD_CFLAGS=""
done
fi

# Various other checks:
if test "x$acx_pthread_ok" = xyes; then
        save_LIBS="$LIBS"
        LIBS="$PTHREAD_LIBS $LIBS"
        save_CFLAGS="$CFLAGS"
        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"

        # Detect AIX lossage: threads are created detached by default
        # and the JOINABLE attribute has a nonstandard name (UNDETACHED).
        AC_MSG_CHECKING([for joinable pthread attribute])
        AC_TRY_LINK([#include <pthread.h>],
                    [int attr=PTHREAD_CREATE_JOINABLE;],
                    ok=PTHREAD_CREATE_JOINABLE, ok=unknown)
        if test x"$ok" = xunknown; then
                AC_TRY_LINK([#include <pthread.h>],
                            [int attr=PTHREAD_CREATE_UNDETACHED;],
                            ok=PTHREAD_CREATE_UNDETACHED, ok=unknown)
        fi
        if test x"$ok" != xPTHREAD_CREATE_JOINABLE; then
                AC_DEFINE(PTHREAD_CREATE_JOINABLE, $ok,
                          [Define to the necessary symbol if this constant
                           uses a non-standard name on your system.])
        fi
        AC_MSG_RESULT(${ok})
        if test x"$ok" = xunknown; then
                AC_MSG_WARN([we do not know how to create joinable pthreads])
        fi

        AC_MSG_CHECKING([if more special flags are required for pthreads])
        flag=no
        case "${host_cpu}-${host_os}" in
                *-aix* | *-freebsd*)     flag="-D_THREAD_SAFE";;
                *solaris* | alpha*-osf*) flag="-D_REENTRANT";;
        esac
        AC_MSG_RESULT(${flag})
        if test "x$flag" != xno; then
                PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
        fi

        LIBS="$save_LIBS"
        CFLAGS="$save_CFLAGS"

        # More AIX lossage: must compile with cc_r
        AC_CHECK_PROG(PTHREAD_CC, cc_r, cc_r, ${CC})
else
        PTHREAD_CC="$CC"
fi

AC_SUBST(PTHREAD_LIBS)
AC_SUBST(PTHREAD_CFLAGS)
AC_SUBST(PTHREAD_CC)

# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
if test x"$acx_pthread_ok" = xyes; then
        ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])
        :
else
        acx_pthread_ok=no
        $2
fi

])dnl ACX_PTHREAD


dnl @synopsis AC_PROG_CC_WARNINGS([ANSI])
dnl
dnl Enables a reasonable set of warnings for the C compiler.  Optionally,
dnl if the first argument is nonempty, turns on flags which enforce and/or
dnl enable proper ANSI C if such flags are known to the compiler used.
dnl
dnl Currently this macro knows about GCC, Solaris C compiler,
dnl Digital Unix C compiler, C for AIX Compiler, HP-UX C compiler,
dnl and IRIX C compiler.
dnl
dnl @version $Id: acinclude.m4,v 1.2 2001/12/21 03:12:50 robs Exp $
dnl @author Ville Laurikari <vl@iki.fi>
dnl
AC_DEFUN([AC_PROG_CC_WARNINGS], [
  ansi=$1
  if test -z "$ansi"; then
    msg="for C compiler warning flags"
  else
    msg="for C compiler warning and ANSI conformance flags"
  fi
  AC_CACHE_CHECK($msg, ac_cv_prog_cc_warnings, [
    if test -n "$CC"; then
      cat > conftest.c <<EOF
int main(int argc, char **argv) { return 0; }
EOF

      dnl GCC
      if test "$GCC" = "yes"; then
        if test -z "$ansi"; then
          ac_cv_prog_cc_warnings="-Wall"
        else
          ac_cv_prog_cc_warnings="-Wall -ansi -pedantic"
        fi

      dnl Solaris C compiler
      elif $CC -flags 2>&1 | grep "Xc.*strict ANSI C" > /dev/null 2>&1 &&
           $CC -c -v -Xc conftest.c > /dev/null 2>&1 &&
           test -f conftest.o; then
        if test -z "$ansi"; then
          ac_cv_prog_cc_warnings="-v"
        else
          ac_cv_prog_cc_warnings="-v -Xc"
        fi

      dnl HP-UX C compiler
      elif $CC > /dev/null 2>&1 &&
           $CC -c -Aa +w1 conftest.c > /dev/null 2>&1 &&
           test -f conftest.o; then
        if test -z "$ansi"; then
          ac_cv_prog_cc_warnings="+w1"
        else
          ac_cv_prog_cc_warnings="+w1 -Aa"
        fi

      dnl Digital Unix C compiler
      elif ! $CC > /dev/null 2>&1 &&
           $CC -c -verbose -w0 -warnprotos -std1 conftest.c > /dev/null 2>&1 &&
           test -f conftest.o; then
        if test -z "$ansi"; then
          ac_cv_prog_cc_warnings="-verbose -w0 -warnprotos"
        else
          ac_cv_prog_cc_warnings="-verbose -w0 -warnprotos -std1"
        fi

      dnl C for AIX Compiler
      elif $CC > /dev/null 2>&1 | grep AIX > /dev/null 2>&1 &&
           $CC -c -qlanglvl=ansi -qinfo=all conftest.c > /dev/null 2>&1 &&
           test -f conftest.o; then
        if test -z "$ansi"; then
          ac_cv_prog_cc_warnings="-qsrcmsg -qinfo=all:noppt:noppc:noobs:nocnd"
        else
          ac_cv_prog_cc_warnings="-qsrcmsg -qinfo=all:noppt:noppc:noobs:nocnd -qlanglvl=ansi"
        fi

      dnl IRIX C compiler
      elif $CC -fullwarn -ansi -ansiE > /dev/null 2>&1 &&
           test -f conftest.o; then
        if test -z "$ansi"; then
          ac_cv_prog_cc_warnings="-fullwarn"
        else
          ac_cv_prog_cc_warnings="-fullwarn -ansi -ansiE"
        fi

      fi
      rm -f conftest.*
    fi
    if test -n "$ac_cv_prog_cc_warnings"; then
      CFLAGS="$CFLAGS $ac_cv_prog_cc_warnings"
    else
      ac_cv_prog_cc_warnings="unknown"
    fi
  ])
])
Commit	Line	Data
d300bc46	1	dnl $Id: acinclude.m4,v 1.2 2001/12/21 03:12:50 robs Exp $
7ef79c64	2
14e49837	3	AC_DEFUN([FCGI_COMMON_CHECKS], [
7ef79c64	4	AC_CHECK_TYPE([ssize_t], [int])
	5
	6	AC_MSG_CHECKING([for sun_len in sys/un.h])
	7	AC_EGREP_HEADER([sun_len], [sys/un.h],
	8	[AC_MSG_RESULT([yes])
	9	AC_DEFINE([HAVE_SOCKADDR_UN_SUN_LEN], [1],
	10	[Define if sockaddr_un in sys/un.h contains a sun_len component])],
	11	AC_MSG_RESULT([no]))
	12
	13	AC_MSG_CHECKING([for fpos_t in stdio.h])
	14	AC_EGREP_HEADER([fpos_t], [stdio.h],
	15	[AC_MSG_RESULT([yes])
	16	AC_DEFINE([HAVE_FPOS], [1],
	17	[Define if the fpos_t typedef is in stdio.h])],
	18	AC_MSG_RESULT([no]))
	19
	20	AC_CHECK_HEADERS([sys/socket.h netdb.h netinet/in.h arpa/inet.h])
	21	AC_CHECK_HEADERS([sys/time.h limits.h sys/param.h unistd.h])
	22
	23	AC_MSG_CHECKING([for a fileno() prototype in stdio.h])
	24	AC_EGREP_HEADER([fileno], [stdio.h],
	25	[AC_MSG_RESULT([yes])
	26	AC_DEFINE([HAVE_FILENO_PROTO], [1],
	27	[Define if there's a fileno() prototype in stdio.h])],
	28	AC_MSG_RESULT([no]))
	29
	30	if test "$HAVE_SYS_SOCKET_H"; then
	31	AC_MSG_CHECKING([for socklen_t in sys/socket.h])
	32	AC_EGREP_HEADER([socklen_t], [sys/socket.h],
	33	[AC_MSG_RESULT([yes])
	34	AC_DEFINE([HAVE_SOCKLEN], [1],
	35	[Define if the socklen_t typedef is in sys/socket.h])],
	36	AC_MSG_RESULT([no]))
	37	fi
	38
	39	#--------------------------------------------------------------------
	40	# Do we need cross-process locking on this platform?
	41	#--------------------------------------------------------------------
	42	AC_MSG_CHECKING([whether cross-process locking is required by accept()])
	43	case "`uname -sr`" in
	44	IRIX\ 5.* \| SunOS\ 5.* \| UNIX_System_V\ 4.0)
	45	AC_MSG_RESULT([yes])
	46	AC_DEFINE([USE_LOCKING], [1],
	47	[Define if cross-process locking is required by accept()])
	48	;;
	49	*)
	50	AC_MSG_RESULT([no])
	51	;;
	52	esac
	53
	54	#--------------------------------------------------------------------
	55	# Does va_arg(arg, long double) crash the compiler?
	56	# hpux 9.04 compiler does and so does Stratus FTX (uses HP's compiler)
	57	#--------------------------------------------------------------------
	58	AC_MSG_CHECKING([whether va_arg(arg, long double) crashes the compiler])
	59	AC_TRY_COMPILE([#include <stdarg.h>],
	60	[long double lDblArg; va_list arg; lDblArg = va_arg(arg, long double);],
	61	AC_MSG_RESULT([no]),
	62	[AC_MSG_RESULT([yes])
	63	AC_DEFINE([HAVE_VA_ARG_LONG_DOUBLE_BUG], [1],
	64	[Define if va_arg(arg, long double) crashes the compiler])])
	65
	66	AC_C_CONST
	67	])
d300bc46	68
	69
	70	dnl @synopsis ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
	71	dnl
	72	dnl This macro figures out how to build C programs using POSIX
	73	dnl threads. It sets the PTHREAD_LIBS output variable to the threads
	74	dnl library and linker flags, and the PTHREAD_CFLAGS output variable
	75	dnl to any special C compiler flags that are needed. (The user can also
	76	dnl force certain compiler flags/libs to be tested by setting these
	77	dnl environment variables.)
	78	dnl
	79	dnl Also sets PTHREAD_CC to any special C compiler that is needed for
	80	dnl multi-threaded programs (defaults to the value of CC otherwise).
	81	dnl (This is necessary on AIX to use the special cc_r compiler alias.)
	82	dnl
	83	dnl If you are only building threads programs, you may wish to
	84	dnl use these variables in your default LIBS, CFLAGS, and CC:
	85	dnl
	86	dnl LIBS="$PTHREAD_LIBS $LIBS"
	87	dnl CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
	88	dnl CC="$PTHREAD_CC"
	89	dnl
	90	dnl In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute
	91	dnl constant has a nonstandard name, defines PTHREAD_CREATE_JOINABLE
	92	dnl to that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
	93	dnl
	94	dnl ACTION-IF-FOUND is a list of shell commands to run if a threads
	95	dnl library is found, and ACTION-IF-NOT-FOUND is a list of commands
	96	dnl to run it if it is not found. If ACTION-IF-FOUND is not specified,
	97	dnl the default action will define HAVE_PTHREAD.
	98	dnl
	99	dnl Please let the authors know if this macro fails on any platform,
	100	dnl or if you have any other suggestions or comments. This macro was
	101	dnl based on work by SGJ on autoconf scripts for FFTW (www.fftw.org)
	102	dnl (with help from M. Frigo), as well as ac_pthread and hb_pthread
	103	dnl macros posted by AFC to the autoconf macro repository. We are also
	104	dnl grateful for the helpful feedback of numerous users.
	105	dnl
	106	dnl @version $Id: acinclude.m4,v 1.2 2001/12/21 03:12:50 robs Exp $
	107	dnl @author Steven G. Johnson <stevenj@alum.mit.edu> and Alejandro Forero Cuervo <bachue@bachue.com>
	108
	109	AC_DEFUN([ACX_PTHREAD], [
	110	AC_REQUIRE([AC_CANONICAL_HOST])
	111	acx_pthread_ok=no
	112
	113	# First, check if the POSIX threads header, pthread.h, is available.
	114	# If it isn't, don't bother looking for the threads libraries.
	115	AC_CHECK_HEADER(pthread.h, , acx_pthread_ok=noheader)
	116
	117	# We must check for the threads library under a number of different
	118	# names; the ordering is very important because some systems
	119	# (e.g. DEC) have both -lpthread and -lpthreads, where one of the
	120	# libraries is broken (non-POSIX).
	121
	122	# First of all, check if the user has set any of the PTHREAD_LIBS,
	123	# etcetera environment variables, and if threads linking works using
	124	# them:
	125	if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
	126	save_CFLAGS="$CFLAGS"
	127	CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
	128	save_LIBS="$LIBS"
	129	LIBS="$PTHREAD_LIBS $LIBS"
	130	AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS])
	131	AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes)
132	AC_MSG_RESULT($acx_pthread_ok)
133	if test x"$acx_pthread_ok" = xno; then
134	PTHREAD_LIBS=""
135	PTHREAD_CFLAGS=""
136	fi
137	LIBS="$save_LIBS"
138	CFLAGS="$save_CFLAGS"
139	fi
140
141	# Create a list of thread flags to try. Items starting with a "-" are
142	# C compiler flags, and other items are library names, except for "none"
143	# which indicates that we try without any flags at all.
144
145	acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt"
146
147	# The ordering is (sometimes) important. Some notes on the
148	# individual items follow:
149
150	# pthreads: AIX (must check this before -lpthread)
151	# none: in case threads are in libc; should be tried before -Kthread and
152	# other compiler flags to prevent continual compiler warnings
153	# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
154	# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
155	# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
156	# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
157	# -pthreads: Solaris/gcc
158	# -mthreads: Mingw32/gcc, Lynx/gcc
159	# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
160	# doesn't hurt to check since this sometimes defines pthreads too;
161	# also defines -D_REENTRANT)
162	# pthread: Linux, etcetera
163	# --thread-safe: KAI C++
164
165	case "${host_cpu}-${host_os}" in
166	solaris)
167
168	# On Solaris (at least, for some versions), libc contains stubbed
169	# (non-functional) versions of the pthreads routines, so link-based
170	# tests will erroneously succeed. (We need to link with -pthread or
171	# -lpthread.) (The stubs are missing pthread_cleanup_push, or rather
172	# a function called by this macro, so we could check for that, but
173	# who knows whether they'll stub that too in a future libc.) So,
174	# we'll just look for -pthreads and -lpthread first:
175
176	acx_pthread_flags="-pthread -pthreads pthread -mt $acx_pthread_flags"
177	;;
178	esac
179
180	if test x"$acx_pthread_ok" = xno; then
181	for flag in $acx_pthread_flags; do
182
183	case $flag in
184	none)
185	AC_MSG_CHECKING([whether pthreads work without any flags])
186	;;
187
188	-*)
189	AC_MSG_CHECKING([whether pthreads work with $flag])
190	PTHREAD_CFLAGS="$flag"
191	;;
192
193	*)
194	AC_MSG_CHECKING([for the pthreads library -l$flag])
195	PTHREAD_LIBS="-l$flag"
196	;;
197	esac
198
199	save_LIBS="$LIBS"
200	save_CFLAGS="$CFLAGS"
201	LIBS="$PTHREAD_LIBS $LIBS"
202	CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
203
204	# Check for various functions. We must include pthread.h,
205	# since some functions may be macros. (On the Sequent, we
206	# need a special flag -Kthread to make this header compile.)
207	# We check for pthread_join because it is in -lpthread on IRIX
208	# while pthread_create is in libc. We check for pthread_attr_init
209	# due to DEC craziness with -lpthreads. We check for
210	# pthread_cleanup_push because it is one of the few pthread
211	# functions on Solaris that doesn't have a non-functional libc stub.
212	# We try pthread_create on general principles.
213	AC_TRY_LINK([#include <pthread.h>],
214	[pthread_t th; pthread_join(th, 0);
215	pthread_attr_init(0); pthread_cleanup_push(0, 0);
216	pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
217	[acx_pthread_ok=yes])
218
219	LIBS="$save_LIBS"
220	CFLAGS="$save_CFLAGS"
221
222	AC_MSG_RESULT($acx_pthread_ok)
223	if test "x$acx_pthread_ok" = xyes; then
224	break;
225	fi
226
227	PTHREAD_LIBS=""
228	PTHREAD_CFLAGS=""
229	done
230	fi
231
232	# Various other checks:
233	if test "x$acx_pthread_ok" = xyes; then
234	save_LIBS="$LIBS"
235	LIBS="$PTHREAD_LIBS $LIBS"
236	save_CFLAGS="$CFLAGS"
237	CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
238
239	# Detect AIX lossage: threads are created detached by default
240	# and the JOINABLE attribute has a nonstandard name (UNDETACHED).
241	AC_MSG_CHECKING([for joinable pthread attribute])
242	AC_TRY_LINK([#include <pthread.h>],
243	[int attr=PTHREAD_CREATE_JOINABLE;],
244	ok=PTHREAD_CREATE_JOINABLE, ok=unknown)
245	if test x"$ok" = xunknown; then
246	AC_TRY_LINK([#include <pthread.h>],
247	[int attr=PTHREAD_CREATE_UNDETACHED;],
248	ok=PTHREAD_CREATE_UNDETACHED, ok=unknown)
249	fi
250	if test x"$ok" != xPTHREAD_CREATE_JOINABLE; then
251	AC_DEFINE(PTHREAD_CREATE_JOINABLE, $ok,
252	[Define to the necessary symbol if this constant
253	uses a non-standard name on your system.])
254	fi
255	AC_MSG_RESULT(${ok})
256	if test x"$ok" = xunknown; then
257	AC_MSG_WARN([we do not know how to create joinable pthreads])
258	fi
259
260	AC_MSG_CHECKING([if more special flags are required for pthreads])
261	flag=no
262	case "${host_cpu}-${host_os}" in
263	-aix \| -freebsd) flag="-D_THREAD_SAFE";;
264	solaris \| alpha-osf) flag="-D_REENTRANT";;
265	esac
266	AC_MSG_RESULT(${flag})
267	if test "x$flag" != xno; then
268	PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
269	fi
270
271	LIBS="$save_LIBS"
272	CFLAGS="$save_CFLAGS"
273
274	# More AIX lossage: must compile with cc_r
275	AC_CHECK_PROG(PTHREAD_CC, cc_r, cc_r, ${CC})
276	else
277	PTHREAD_CC="$CC"
278	fi
279
280	AC_SUBST(PTHREAD_LIBS)
281	AC_SUBST(PTHREAD_CFLAGS)
282	AC_SUBST(PTHREAD_CC)
283
284	# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
285	if test x"$acx_pthread_ok" = xyes; then
286	ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])
287	:
288	else
289	acx_pthread_ok=no
290	$2
291	fi
292
293	])dnl ACX_PTHREAD
294
295
296
297	dnl @synopsis AC_PROG_CC_WARNINGS([ANSI])
298	dnl
299	dnl Enables a reasonable set of warnings for the C compiler. Optionally,
300	dnl if the first argument is nonempty, turns on flags which enforce and/or
301	dnl enable proper ANSI C if such flags are known to the compiler used.
302	dnl
303	dnl Currently this macro knows about GCC, Solaris C compiler,
304	dnl Digital Unix C compiler, C for AIX Compiler, HP-UX C compiler,
305	dnl and IRIX C compiler.
306	dnl
307	dnl @version $Id: acinclude.m4,v 1.2 2001/12/21 03:12:50 robs Exp $
308	dnl @author Ville Laurikari <vl@iki.fi>
309	dnl
310	AC_DEFUN([AC_PROG_CC_WARNINGS], [
311	ansi=$1
312	if test -z "$ansi"; then
313	msg="for C compiler warning flags"
314	else
315	msg="for C compiler warning and ANSI conformance flags"
316	fi
317	AC_CACHE_CHECK($msg, ac_cv_prog_cc_warnings, [
318	if test -n "$CC"; then
319	cat > conftest.c <<EOF
320	int main(int argc, char **argv) { return 0; }
321	EOF
322
323	dnl GCC
324	if test "$GCC" = "yes"; then
325	if test -z "$ansi"; then
326	ac_cv_prog_cc_warnings="-Wall"
327	else
328	ac_cv_prog_cc_warnings="-Wall -ansi -pedantic"
329	fi
330
331	dnl Solaris C compiler
332	elif $CC -flags 2>&1 \| grep "Xc.*strict ANSI C" > /dev/null 2>&1 &&
333	$CC -c -v -Xc conftest.c > /dev/null 2>&1 &&
334	test -f conftest.o; then
335	if test -z "$ansi"; then
336	ac_cv_prog_cc_warnings="-v"
337	else
338	ac_cv_prog_cc_warnings="-v -Xc"
339	fi
340
341	dnl HP-UX C compiler
342	elif $CC > /dev/null 2>&1 &&
343	$CC -c -Aa +w1 conftest.c > /dev/null 2>&1 &&
344	test -f conftest.o; then
345	if test -z "$ansi"; then
346	ac_cv_prog_cc_warnings="+w1"
347	else
348	ac_cv_prog_cc_warnings="+w1 -Aa"
349	fi
350
351	dnl Digital Unix C compiler
352	elif ! $CC > /dev/null 2>&1 &&
353	$CC -c -verbose -w0 -warnprotos -std1 conftest.c > /dev/null 2>&1 &&
354	test -f conftest.o; then
355	if test -z "$ansi"; then
356	ac_cv_prog_cc_warnings="-verbose -w0 -warnprotos"
357	else
358	ac_cv_prog_cc_warnings="-verbose -w0 -warnprotos -std1"
359	fi
360
361	dnl C for AIX Compiler
362	elif $CC > /dev/null 2>&1 \| grep AIX > /dev/null 2>&1 &&
363	$CC -c -qlanglvl=ansi -qinfo=all conftest.c > /dev/null 2>&1 &&
364	test -f conftest.o; then
365	if test -z "$ansi"; then
366	ac_cv_prog_cc_warnings="-qsrcmsg -qinfo=all:noppt:noppc:noobs:nocnd"
367	else
368	ac_cv_prog_cc_warnings="-qsrcmsg -qinfo=all:noppt:noppc:noobs:nocnd -qlanglvl=ansi"
369	fi
370
371	dnl IRIX C compiler
372	elif $CC -fullwarn -ansi -ansiE > /dev/null 2>&1 &&
373	test -f conftest.o; then
374	if test -z "$ansi"; then
375	ac_cv_prog_cc_warnings="-fullwarn"
376	else
377	ac_cv_prog_cc_warnings="-fullwarn -ansi -ansiE"
378	fi
379
380	fi
381	rm -f conftest.*
382	fi
383	if test -n "$ac_cv_prog_cc_warnings"; then
384	CFLAGS="$CFLAGS $ac_cv_prog_cc_warnings"
385	else
386	ac_cv_prog_cc_warnings="unknown"
387	fi
388	])
389	])
390
391