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Apache HTTP Server / configure.in

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dnl
dnl Autoconf configuration for Apache httpd
dnl
dnl     Use ./buildconf to produce a configure script
dnl

AC_PREREQ(2.50)
AC_INIT(ABOUT_APACHE)

AC_CONFIG_HEADER(include/ap_config_auto.h)
AC_CONFIG_AUX_DIR(build)

dnl #
dnl # Include our own M4 macros along with those for APR and libtool
dnl #
sinclude(build/apr_common.m4)
sinclude(build/find_apr.m4)
sinclude(build/find_apu.m4)
sinclude(acinclude.m4)

dnl Later versions of autoconf (>= 2.62) by default cause the produced
dnl configure script to emit at least warnings when it comes across unknown
dnl command line options. These versions also have the macro
dnl AC_DISABLE_OPTION_CHECKING defined which turns this off by default.
dnl We want to have this turned off here since our configure calls can
dnl contain options for APR / APR-UTIL configure that are unknown to us.
dnl So avoid confusing the user by turning this off. See also PR 45221.
ifdef([AC_DISABLE_OPTION_CHECKING], [AC_DISABLE_OPTION_CHECKING])

dnl XXX we can't just use AC_PREFIX_DEFAULT because that isn't subbed in
dnl by configure until it is too late.  Is that how it should be or not?
dnl Something seems broken here.                                               
AC_PREFIX_DEFAULT(/usr/local/apache2)

dnl Get the layout here, so we can pass the required variables to apr
APR_ENABLE_LAYOUT(Apache, [errordir iconsdir htdocsdir cgidir])

dnl reparse the configure arguments.
APR_PARSE_ARGUMENTS

dnl export expanded and relative configure argument variables
APACHE_EXPORT_ARGUMENTS

dnl Save user-defined environment settings for later restoration
dnl
APR_SAVE_THE_ENVIRONMENT(CPPFLAGS)
APR_SAVE_THE_ENVIRONMENT(CFLAGS)
APR_SAVE_THE_ENVIRONMENT(CXXFLAGS)
APR_SAVE_THE_ENVIRONMENT(LDFLAGS)
APR_SAVE_THE_ENVIRONMENT(LIBS)
APR_SAVE_THE_ENVIRONMENT(INCLUDES)

dnl Generate ./config.nice for reproducing runs of configure
dnl
APR_CONFIG_NICE(config.nice)

nl='
'
dnl Check that mkdir -p works
APR_MKDIR_P_CHECK($top_srcdir/build/mkdir.sh)

dnl ## Run configure for packages Apache uses

dnl shared library support for these packages doesn't currently
dnl work on some platforms

AC_CANONICAL_SYSTEM

orig_prefix="$prefix"

echo $ac_n "${nl}Configuring Apache Portable Runtime library ...${nl}"

AC_ARG_WITH(included-apr,
APACHE_HELP_STRING(--with-included-apr,Use bundled copies of APR/APR-Util))

if test "x$with_included_apr" = "xyes"; then
   apr_found=reconfig
else 
   APR_FIND_APR("$srcdir/srclib/apr", "./srclib/apr", 1, 1 2)
fi

if test "$apr_found" = "no"; then
  AC_MSG_ERROR([APR not found.  Please read the documentation.])
fi

if test "$apr_found" = "reconfig"; then
  APR_SUBDIR_CONFIG(srclib/apr,
                    [$apache_apr_flags --prefix=$prefix --exec-prefix=$exec_prefix --libdir=$libdir --includedir=$includedir --bindir=$bindir --datadir=$datadir --with-installbuilddir=$installbuilddir],
                    [--enable-layout=*|\'--enable-layout=*])
  dnl We must be the first to build and the last to be cleaned
  AP_BUILD_SRCLIB_DIRS="apr $AP_BUILD_SRCLIB_DIRS"
  AP_CLEAN_SRCLIB_DIRS="$AP_CLEAN_SRCLIB_DIRS apr"

  dnl We have to find apr-N-config when we reconfigure APR.
  for majorver in 1 2; do
    test_apr_config="./srclib/apr/apr-${majorver}-config"
    if test -f "$test_apr_config"; then
      apr_config="$test_apr_config"
    fi
  done
fi

APR_SETIFNULL(CC, `$apr_config --cc`)
APR_SETIFNULL(CPP, `$apr_config --cpp`)
APR_ADDTO(CFLAGS, `$apr_config --cflags`)
APR_ADDTO(CPPFLAGS, `$apr_config --cppflags`)
dnl internal-only CPPFLAGS (shouldn't affect third-party module builds)
INTERNAL_CPPFLAGS=""
APR_ADDTO(LDFLAGS, `$apr_config --ldflags`)
SHLIBPATH_VAR=`$apr_config --shlib-path-var`
APR_BINDIR=`$apr_config --bindir`
APR_INCLUDEDIR=`$apr_config --includedir`
APR_INCLUDES=`$apr_config --includes`
APR_VERSION=`$apr_config --version`
apr_major_version=`echo ${APR_VERSION} | sed 's,\..*,,'`
APR_CONFIG="$APR_BINDIR/apr-${apr_major_version}-config"

echo $ac_n "${nl}Configuring Apache Portable Runtime Utility library...${nl}"

if test "x${apr_major_version}" = "x2"; then
   apu_found=obsolete
elif test "x$with_included_apr" = "xyes"; then
   apu_found=reconfig
else 
   dnl If httpd is buildconf'ed against an apr 2.x tree, then 1.x
   dnl isn't supported. 
   ifdef([APR_FIND_APU], [
     APR_FIND_APU("$srcdir/srclib/apr-util", "./srclib/apr-util", 
                  1, ${apr_major_version})
   ], [apu_found=no])
fi

if test "$apu_found" = "no"; then
  AC_MSG_ERROR([APR-util not found.  Please read the documentation.])
fi

# Catch some misconfigurations:
case ${apr_found}.${apu_found} in
reconfig.yes)
  AC_MSG_ERROR([Cannot use an external APR-util with the bundled APR])
  ;;
yes.reconfig)
  AC_MSG_ERROR([Cannot use an external APR with the bundled APR-util])
  ;;
esac  

if test "$apu_found" = "reconfig"; then
  APR_SUBDIR_CONFIG(srclib/apr-util,
                    [--with-apr=../apr --prefix=$prefix --exec-prefix=$exec_prefix --libdir=$libdir --includedir=$includedir --bindir=$bindir],
                    [--enable-layout=*|\'--enable-layout=*])
  dnl We must be the last to build and the first to be cleaned
  AP_BUILD_SRCLIB_DIRS="$AP_BUILD_SRCLIB_DIRS apr-util"
  AP_CLEAN_SRCLIB_DIRS="apr-util $AP_CLEAN_SRCLIB_DIRS"
  dnl APR and APR-Util major versions must match
  apu_config="./srclib/apr-util/apu-${apr_major_version}-config"
fi

if test "$apu_found" = "obsolete"; then
  AC_MSG_NOTICE([APR-util obsoleted, woohoo])
else
  APR_ADDTO(LDFLAGS, `$apu_config --ldflags`)
  APU_BINDIR=`$apu_config --bindir`
  APU_INCLUDEDIR=`$apu_config --includedir`
  APU_INCLUDES=`$apu_config --includes`
  APU_VERSION=`$apu_config --version`
  APU_CONFIG="$APU_BINDIR/apu-`echo ${APU_VERSION} | sed 's,\..*,,'`-config"
fi

dnl In case we picked up CC and CPP from APR, get that info into the
dnl config cache so that PCRE uses it.  Otherwise, CC and CPP used for
dnl PCRE and for our config tests will be whatever PCRE determines.
AC_PROG_CC
AC_PROG_CPP

dnl Try to get c99 support for variadic macros
ifdef([AC_PROG_CC_C99], [AC_PROG_CC_C99])

if test "x${cache_file}" = "x/dev/null"; then
  # Likewise, ensure that CC and CPP are passed through to the pcre
  # configure script iff caching is disabled (the autoconf 2.5x default).
  export CC; export CPP
fi

dnl Absolute source/build directory
abs_srcdir=`(cd $srcdir && pwd)`
abs_builddir=`pwd`

AC_ARG_WITH(pcre,
APACHE_HELP_STRING(--with-pcre=PATH,Use external PCRE library))

AC_PATH_PROG(PCRE_CONFIG, pcre-config, false)
if test -d "$with_pcre" && test -x "$with_pcre/bin/pcre-config"; then
   PCRE_CONFIG=$with_pcre/bin/pcre-config
elif test -x "$with_pcre"; then
   PCRE_CONFIG=$with_pcre
fi

if test "$PCRE_CONFIG" != "false"; then
  if $PCRE_CONFIG --version >/dev/null 2>&1; then :; else
    AC_MSG_ERROR([Did not find pcre-config script at $PCRE_CONFIG])
  fi
  AC_MSG_NOTICE([Using external PCRE library from $PCRE_CONFIG])
  APR_ADDTO(PCRE_INCLUDES, [`$PCRE_CONFIG --cflags`])
  APR_ADDTO(PCRE_LIBS, [`$PCRE_CONFIG --libs`])
else
  AC_MSG_ERROR([pcre-config for libpcre not found. PCRE is required and available from http://pcre.org/])
fi
APACHE_SUBST(PCRE_LIBS)

echo $ac_n "${nl}Configuring Apache httpd ...${nl}"

dnl If the source dir is not equal to the build dir, 
dnl then we are running in VPATH mode.

APR_ADDTO(INCLUDES, [-I.])

if test "$abs_builddir" != "$abs_srcdir"; then
  APR_ADDTO(INCLUDES, [-I\$(top_builddir)/include])
fi

APR_ADDTO(INCLUDES, [-I\$(top_srcdir)/os/\$(OS_DIR) -I\$(top_srcdir)/include])

# apr/apr-util --includes may pick up system paths for dependent
# libraries, so ensure these are later in INCLUDES than local source
# directories.
APR_ADDTO(INCLUDES, $APR_INCLUDES)
APR_ADDTO(INCLUDES, $APU_INCLUDES)

dnl Add in path to PCRE includes
APR_ADDTO(INCLUDES, $PCRE_INCLUDES)

echo $ac_n "${nl}Applying OS-specific hints for httpd ...${nl}"

case $host in
  *os2*)
      # Use a custom made libtool replacement
      echo "using aplibtool"
      LIBTOOL="$abs_srcdir/srclib/apr/build/aplibtool"
      SH_LIBTOOL="$LIBTOOL --shared --export-all"
      SH_LIBS="\$(ALL_LIBS)"
      CORE_IMPLIB_FILE="ApacheCoreOS2.la"
      CORE_IMPLIB="$abs_srcdir/server/$CORE_IMPLIB_FILE"
      MK_IMPLIB="emximp"
      other_targets="$other_targets os2core"
      INSTALL_PROG_FLAGS="-e .exe"
      SHLTCFLAGS=""
      LTCFLAGS=""
      ;;
  *)
      if test "x$LTFLAGS" = "x"; then
          LTFLAGS='--silent'
      fi
      my_libtool=`$apr_config --apr-libtool`
      LIBTOOL="$my_libtool \$(LTFLAGS)"
      libtoolversion=`$my_libtool --version`
      case $libtoolversion in
          *1.[[45]]* | *[[2-9]].[[0-9]]*)
              SH_LIBTOOL='$(LIBTOOL)'
              SHLTCFLAGS="-prefer-pic"
              LTCFLAGS="-prefer-non-pic -static"
              ;;
          *)
              SH_LIBTOOL='$(SHELL) $(top_builddir)/shlibtool $(LTFLAGS)'
              SHLTCFLAGS=""
              LTCFLAGS=""
              ;;
      esac
      ;;
esac
APACHE_SUBST(SHLTCFLAGS)
APACHE_SUBST(LTCFLAGS)

case $host in
  *-apple-aux3*)
      APR_SETVAR(SINGLE_LISTEN_UNSERIALIZED_ACCEPT, [1])
      ;;
  *os2-emx*)
      APR_SETVAR(SINGLE_LISTEN_UNSERIALIZED_ACCEPT, [1])
      ;;
  *-linux-*)
      case `uname -r` in
        2.[[2-9]]* ) 
            APR_SETVAR(SINGLE_LISTEN_UNSERIALIZED_ACCEPT, [1])
            ;;
        * )
            ;;
      esac
      ;;
  *486-*-bsdi* | *-netbsd* | *-freebsd* | *-apple-darwin* | *-dec-osf* | *-qnx)
      APR_SETVAR(SINGLE_LISTEN_UNSERIALIZED_ACCEPT, [1])
      ;;
  *-solaris2*)
      dnl This is a hack -- we should be using AC_TRY_RUN instead
      ap_platform_runtime_link_flag="-R"
      dnl solaris 8 and above don't have a thundering herd
      dnl not sure about rev's before this one.
      case `uname -r` in
        5.[567]*)
            ;;
        * )
            APR_SETVAR(SINGLE_LISTEN_UNSERIALIZED_ACCEPT, [1])
            ;;
      esac
      ;;
  *cygwin*)
      APR_SETVAR(SINGLE_LISTEN_UNSERIALIZED_ACCEPT, [1])
      ;;
  *mingw32*)
      APR_ADDTO(INTERNAL_CPPFLAGS, [-DAP_DECLARE_EXPORT])
      APR_SETIFNULL(ac_cv_func_times, [no])
      APR_SETIFNULL(ac_cv_func_getpwnam, [no])
      APR_SETIFNULL(ac_cv_func_getgrnam, [no])
      ;;
  *aix*)
      aixver=`echo $host | sed 's/^[[^0-9]]*//' | sed 's/\.//g'`
      if test $aixver -ge 4320; then
        APR_SETVAR(SINGLE_LISTEN_UNSERIALIZED_ACCEPT, [1])
      fi
      ;;
  *os390*)
      APR_SETVAR(SINGLE_LISTEN_UNSERIALIZED_ACCEPT, [1])
      ;;
esac

APR_SETVAR(AP_NONBLOCK_WHEN_MULTI_LISTEN, [1])

dnl
dnl Process command line arguments. This is done early in the process so the
dnl user can get feedback quickly in case of an error.
dnl
dnl ### need to move some of the arguments "up here"

dnl ## Check for programs

AC_PATH_PROG(RM, rm)
AC_PATH_PROG(PKGCONFIG, pkg-config)
AC_PATH_PROG(RSYNC, rsync)
AC_PROG_AWK
AC_PROG_LN_S
AC_CHECK_TOOL(RANLIB, ranlib, true)
dnl AC_PATH_PROG(PERL_PATH, perl)
AC_CHECK_PROGS(LYNX_PATH,[lynx links elinks], [lynx])

# Hard-coded install programs
MKINSTALLDIRS="\$(abs_srcdir)/build/mkdir.sh"
INSTALL="\$(LIBTOOL) --mode=install \$(abs_srcdir)/build/install.sh -c"
APACHE_SUBST(MKINSTALLDIRS)
APACHE_SUBST(INSTALL)

dnl Various OS checks that apparently set required flags
ifdef([AC_USE_SYSTEM_EXTENSIONS], [
AC_USE_SYSTEM_EXTENSIONS
], [
AC_AIX
AC_MINIX
])

AC_ISC_POSIX

# Ensure that satisfactory versions of apr and apr-util are 
# found if external copies are configured.
if test "${apr_found}" = "yes"; then
  # Require at least APR 1.3.x otherwise fail
  APACHE_CHECK_APxVER([apr], 1, 3)
fi

if test "${apu_found}" = "yes"; then
  # Require at least APR-util 1.3.x otherwise fail
  if test "${apr_found}" = "yes"; then
    # we need to add the APR includes to CPPFLAGS
    apu_ckver_CPPFLAGS="$CPPFLAGS"
    CPPFLAGS="$CPPFLAGS `$apr_config --includes`"
    APACHE_CHECK_APxVER([apu], 1, 3)
    CPPFLAGS="$apu_ckver_CPPFLAGS"
  else
    APACHE_CHECK_APxVER([apu], 1, 3)
  fi
fi

dnl Check for what we can generate dependency files with
APR_CHECK_DEPEND

dnl ## Check for libraries

dnl ## Check for header files

dnl I think these are just used all over the place, so just check for
dnl them at the base of the tree. If some are specific to a single
dnl directory, they should be moved (Comment #Spoon)

dnl Regarding standard header files: AC_HEADER_STDC doesn't set symbols
dnl HAVE_STRING_H, HAVE_STDLIB_H, etc., so those are checked for
dnl explicitly so that the normal HAVE_xxx_H symbol is defined.

AC_HEADER_STDC
AC_CHECK_HEADERS( \
string.h \
limits.h \
unistd.h \
sys/socket.h \
pwd.h \
grp.h \
strings.h \
sys/prctl.h \
sys/processor.h \
sys/sem.h \
sys/sdt.h
)
AC_HEADER_SYS_WAIT

dnl ## Check for typedefs, structures, and compiler characteristics.

AC_C_CONST

dnl ## Check for library functions
dnl ## sqrt() only needed in support/ab.c
saved_LIBS="$LIBS"
LIBS=""
AC_SEARCH_LIBS(sqrt, m)
MATH_LIBS="$LIBS"
APACHE_SUBST(MATH_LIBS)
LIBS="$saved_LIBS"

saved_LIBS="$LIBS"
LIBS=""
AC_SEARCH_LIBS(crypt, crypt)
CRYPT_LIBS="$LIBS"
APACHE_SUBST(CRYPT_LIBS)
LIBS="$saved_LIBS"

dnl See Comment #Spoon

AC_CHECK_FUNCS( \
getpwnam \
getgrnam \
initgroups \
bindprocessor \
prctl \
timegm \
getpgid \
fopen64
)

dnl confirm that a void pointer is large enough to store a long integer
APACHE_CHECK_VOID_PTR_LEN

AC_CACHE_CHECK([for gettid()], ac_cv_gettid,
[AC_TRY_RUN(#define _GNU_SOURCE
#include <unistd.h>
#include <sys/syscall.h>
#include <sys/types.h>
int main(int argc, char **argv) {
pid_t t = syscall(SYS_gettid); return t == -1 ? 1 : 0; },
[ac_cv_gettid=yes], [ac_cv_gettid=no], [ac_cv_gettid=no])])
if test "$ac_cv_gettid" = "yes"; then
    AC_DEFINE(HAVE_GETTID, 1, [Define if you have gettid()])
fi

dnl ## Check for the tm_gmtoff field in struct tm to get the timezone diffs
AC_CACHE_CHECK([for tm_gmtoff in struct tm], ac_cv_struct_tm_gmtoff,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <time.h>], [struct tm tm; tm.tm_gmtoff;],
  ac_cv_struct_tm_gmtoff=yes, ac_cv_struct_tm_gmtoff=no)])
if test "$ac_cv_struct_tm_gmtoff" = "yes"; then
    AC_DEFINE(HAVE_GMTOFF, 1, [Define if struct tm has a tm_gmtoff field])
fi

dnl ## Set up any appropriate OS-specific environment variables for apachectl

case $host in
    *aix*)
        # for 32-bit builds, increase MAXDATA to allow lots of threads
        if test x$OBJECT_MODE != x64; then
            OS_SPECIFIC_VARS="LDR_CNTRL=\"MAXDATA=0x80000000\" ; export LDR_CNTRL ;"
        fi
        OS_SPECIFIC_VARS="$OS_SPECIFIC_VARS AIXTHREAD_SCOPE=S ; export AIXTHREAD_SCOPE"
        OS_SPECIFIC_VARS="$OS_SPECIFIC_VARS ; AIXTHREAD_MUTEX_DEBUG=OFF ; export AIXTHREAD_MUTEX_DEBUG"
        OS_SPECIFIC_VARS="$OS_SPECIFIC_VARS ; AIXTHREAD_RWLOCK_DEBUG=OFF ; export AIXTHREAD_RWLOCK_DEBUG"
        OS_SPECIFIC_VARS="$OS_SPECIFIC_VARS ; AIXTHREAD_COND_DEBUG=OFF ; export AIXTHREAD_COND_DEBUG"
        OS_SPECIFIC_VARS="$OS_SPECIFIC_VARS ; SPINLOOPTIME=1000 ; export SPINLOOPTIME"
        OS_SPECIFIC_VARS="$OS_SPECIFIC_VARS ; YIELDLOOPTIME=8 ; export YIELDLOOPTIME"
        OS_SPECIFIC_VARS="$OS_SPECIFIC_VARS ; MALLOCMULTIHEAP=considersize,heaps:8 ; export MALLOCMULTIHEAP"
        ;;
    *os390*)
        OS_SPECIFIC_VARS="export _CEE_RUNOPTS=\"STACK(,,ANY)\" ; export _EDC_ADD_ERRNO2=1"
        ;;
    *)
        OS_SPECIFIC_VARS=""
esac
      
AC_ARG_WITH(port,APACHE_HELP_STRING(--with-port=PORT,Port on which to listen (default is 80)),
        [if test "$withval" = "yes"; then AC_MSG_ERROR('option --with-port requires a value (the TCP port number)'); else PORT="$withval"; fi],
	[PORT=80])

AC_ARG_WITH(sslport,APACHE_HELP_STRING(--with-sslport=SSLPORT,Port on which to securelisten (default is 443)),
        [if test "$withval" = "yes"; then AC_MSG_ERROR('option --with-sslport requires a value (the SSL TCP port number)'); else SSLPORT="$withval"; fi],
	[SSLPORT=443])

DTRACE=true
AC_ARG_ENABLE(dtrace,APACHE_HELP_STRING(--enable-dtrace,Enable DTrace probes),
[
  enable_dtrace=$enableval
  APR_ADDTO(CPPFLAGS, -DAPR_DTRACE_PROVIDER)
  AC_MSG_ERROR('DTrace Support in the build system is not complete. Patches Welcome!')
],
[
  enable_dtrace=no
])

dnl Disabled dtrace build for now.
enable_dtrace=no

case $host in
  *-solaris2*)
    if test $enable_dtrace = "yes" -a "$ac_cv_header_sys_sdt_h" = "yes"; then
        AC_DEFINE(AP_ENABLE_DTRACE, 1,
                  [Enable DTrace probes])
        DTRACE="/usr/sbin/dtrace $DTRACEFLAGS"
        test -f include/apache_probes.h || $DTRACE -h -s apache_probes.d -o include/apache_probes.h
    fi
    ;;
esac

APACHE_SUBST(DTRACE)

AC_ARG_ENABLE(hook-probes,APACHE_HELP_STRING(--enable-hook-probes,Enable APR hook probes),
[
    AC_DEFINE(AP_HOOK_PROBES_ENABLED, 1,
        [Enable the APR hook probes capability, reading from ap_hook_probes.h])
    APR_ADDTO(INTERNAL_CPPFLAGS, -DAP_HOOK_PROBES_ENABLED)
])dnl

AC_ARG_ENABLE(exception-hook,APACHE_HELP_STRING(--enable-exception-hook,Enable fatal exception hook),
[
    AC_DEFINE(AP_ENABLE_EXCEPTION_HOOK, 1,
              [Allow modules to run hook after a fatal exception])
])dnl

AC_ARG_ENABLE(maintainer-mode,APACHE_HELP_STRING(--enable-maintainer-mode,Turn on debugging and compile time warnings),
[
  APR_ADDTO(CPPFLAGS, -DAP_DEBUG)
  if test "$GCC" = "yes"; then
    APR_ADDTO(CFLAGS,[-Wall -Wmissing-prototypes -Wstrict-prototypes -Wmissing-declarations -Wpointer-arith])
    AC_CACHE_CHECK([whether gcc accepts -Wdeclaration-after-statement], [ap_cv_cc_Wdas], [
      save_CFLAGS=$CFLAGS
      CFLAGS="$CFLAGS -Wdeclaration-after-statement"
      AC_COMPILE_IFELSE([AC_LANG_SOURCE([int foo() { return 0; }])],
        [ap_cv_cc_Wdas=yes], [ap_cv_cc_Wdas=no])
      CFLAGS=$save_CFLAGS
    ])
    if test "$ap_cv_cc_Wdas" = "yes"; then
      APR_ADDTO(CFLAGS,[-Wdeclaration-after-statement])
    fi
  elif test "$AIX_XLC" = "yes"; then
    APR_ADDTO(CFLAGS,-qfullpath -qinitauto=FE -qcheck=all -qinfo=pro)
  fi
])dnl

AC_ARG_ENABLE(debugger-mode,APACHE_HELP_STRING(--enable-debugger-mode,Turn on debugging and compile time warnings and turn off optimization),
[
  APR_ADDTO(CPPFLAGS, -DAP_DEBUG)
  if test "$GCC" = "yes"; then
    APR_ADDTO(CFLAGS,[-Wall -Wmissing-prototypes -Wstrict-prototypes -Wmissing-declarations -Wpointer-arith -O0])
    AC_CACHE_CHECK([whether gcc accepts -Wdeclaration-after-statement], [ap_cv_cc_Wdas], [
      save_CFLAGS=$CFLAGS
      CFLAGS="$CFLAGS -Wdeclaration-after-statement"
      AC_COMPILE_IFELSE([AC_LANG_SOURCE([int foo() { return 0; }])],
        [ap_cv_cc_Wdas=yes], [ap_cv_cc_Wdas=no])
      CFLAGS=$save_CFLAGS
    ])
    if test "$ap_cv_cc_Wdas" = "yes"; then
      APR_ADDTO(CFLAGS,[-Wdeclaration-after-statement])
    fi
  elif test "$AIX_XLC" = "yes"; then
    APR_ADDTO(CFLAGS,-qfullpath -qinitauto=FE -qcheck=all -qinfo=pro)
  fi
])dnl

dnl Conditionally enable PIE support for GNU toolchains.
AC_ARG_ENABLE(pie,APACHE_HELP_STRING(--enable-pie,Build httpd as a Position Independent Executable))
if test "$enable_pie" = "yes"; then
   AC_CACHE_CHECK([whether $CC accepts PIE flags], [ap_cv_cc_pie], [
     save_CFLAGS=$CFLAGS
     save_LDFLAGS=$LDFLAGS
     CFLAGS="$CFLAGS -fPIE"
     LDFLAGS="$LDFLAGS -pie"
     AC_TRY_RUN([static int foo[30000]; int main () { return 0; }],
      [ap_cv_cc_pie=yes], [ap_cv_cc_pie=no], [ap_cv_cc_pie=yes])
     CFLAGS=$save_CFLAGS
     LDFLAGS=$save_LDFLAGS
   ])
   if test "$ap_cv_cc_pie" = "yes"; then
     PICFLAGS="-fPIE"
     PILDFLAGS="-pie"
   else
     AC_ERROR([--enable-pie requested but $CC failed using PIE flags])
   fi
fi
AC_SUBST(PICFLAGS)
AC_SUBST(PILDFLAGS)

prefix="$orig_prefix"
APACHE_ENABLE_MODULES

dnl reading config stubs
esyscmd(./build/config-stubs .)

APACHE_SUBST(progname)
APACHE_SUBST(OS)
APACHE_SUBST(OS_DIR)
APACHE_SUBST(BUILTIN_LIBS)
APACHE_SUBST(SHLIBPATH_VAR)
APACHE_SUBST(OS_SPECIFIC_VARS)

PRE_SHARED_CMDS='echo ""'
POST_SHARED_CMDS='echo ""'

dnl apache_need_shared tells us if Apache modules are being built as DSOs

if test "$apache_need_shared" = "yes"; then
  if test -f $ac_aux_dir/ltconfig; then
    $SHELL $ac_aux_dir/ltconfig --output=shlibtool --disable-static --srcdir=$ac_aux_dir --cache-file=./config.cache $ac_aux_dir/ltmain.sh
  fi
  shared_build="shared-build"
fi

dnl enable_so tells us if *any* modules can be built as DSOs

if test "$enable_so" = "yes" -o "$enable_so" = "static"; then
  case $host in
    *-ibm-aix*)
      APR_ADDTO(HTTPD_LDFLAGS, [-Wl,-uXML_Parse -Wl,-bE:$abs_builddir/server/httpd.exp])
      APR_ADDTO(SH_LDFLAGS, [\$(EXTRA_LDFLAGS) \$(EXTRA_LIBS)])
      APR_ADDTO(UTIL_LDFLAGS, [-Wl,-uXML_Parse])
      ;;
    *os390)
      APR_ADDTO(HTTPD_LDFLAGS, [--main=$abs_srcdir/server/main.o --core-dll=$abs_srcdir/apachecore.dll])
      APR_ADDTO(SH_LDFLAGS, [--core-dll=$abs_srcdir/apachecore.dll])
  esac
  MOD_SO_ENABLED=yes
fi
AC_SUBST(MOD_SO_ENABLED)

APACHE_SUBST(PRE_SHARED_CMDS)
APACHE_SUBST(POST_SHARED_CMDS)
APACHE_SUBST(shared_build)

AC_ARG_WITH(program-name,
APACHE_HELP_STRING(--with-program-name,alternate executable name),[
  progname="$withval" ], [
  progname="httpd"] )

# SuExec parameters
AC_ARG_WITH(suexec-bin,
APACHE_HELP_STRING(--with-suexec-bin,Path to suexec binary),[
  AC_DEFINE_UNQUOTED(SUEXEC_BIN, "$withval", [Path to suexec binary] )
] )

AC_ARG_WITH(suexec-caller,
APACHE_HELP_STRING(--with-suexec-caller,User allowed to call SuExec),[
  AC_DEFINE_UNQUOTED(AP_HTTPD_USER, "$withval", [User allowed to call SuExec] ) ] )

AC_ARG_WITH(suexec-userdir,
APACHE_HELP_STRING(--with-suexec-userdir,User subdirectory),[
  AC_DEFINE_UNQUOTED(AP_USERDIR_SUFFIX, "$withval", [User subdirectory] ) ] )

AC_ARG_WITH(suexec-docroot,
APACHE_HELP_STRING(--with-suexec-docroot,SuExec root directory),[
  AC_DEFINE_UNQUOTED(AP_DOC_ROOT, "$withval", [SuExec root directory] ) ] )

AC_ARG_WITH(suexec-uidmin,
APACHE_HELP_STRING(--with-suexec-uidmin,Minimal allowed UID),[
  AC_DEFINE_UNQUOTED(AP_UID_MIN, $withval, [Minimum allowed UID] ) ] )

AC_ARG_WITH(suexec-gidmin,
APACHE_HELP_STRING(--with-suexec-gidmin,Minimal allowed GID),[
  AC_DEFINE_UNQUOTED(AP_GID_MIN, $withval, [Minimum allowed GID] ) ] )

AC_ARG_WITH(suexec-logfile,
APACHE_HELP_STRING(--with-suexec-logfile,Set the logfile),[
  AC_DEFINE_UNQUOTED(AP_LOG_EXEC, "$withval", [SuExec log file] ) ] )

AC_ARG_WITH(suexec-safepath,
APACHE_HELP_STRING(--with-suexec-safepath,Set the safepath),[
  AC_DEFINE_UNQUOTED(AP_SAFE_PATH, "$withval", [safe shell path for SuExec] ) ] )

AC_ARG_WITH(suexec-umask,
APACHE_HELP_STRING(--with-suexec-umask,umask for suexec'd process),[
  AC_DEFINE_UNQUOTED(AP_SUEXEC_UMASK, 0$withval, [umask for suexec'd process] ) ] )

dnl APR should go after the other libs, so the right symbols can be picked up
if test x${apu_found} != xobsolete; then
  AP_LIBS="$AP_LIBS `$apu_config --avoid-ldap --link-libtool --libs`"
fi
AP_LIBS="$AP_LIBS `$apr_config --link-libtool --libs`" 
APACHE_SUBST(AP_LIBS)
APACHE_SUBST(AP_BUILD_SRCLIB_DIRS)
APACHE_SUBST(AP_CLEAN_SRCLIB_DIRS)

AC_DEFINE(AP_USING_AUTOCONF, 1,
		[Using autoconf to configure Apache])

if test "$SINGLE_LISTEN_UNSERIALIZED_ACCEPT" = "1"; then
    AC_DEFINE(SINGLE_LISTEN_UNSERIALIZED_ACCEPT, 1, 
              [This platform doesn't suffer from the thundering herd problem])
fi

if test "$AP_NONBLOCK_WHEN_MULTI_LISTEN" = "1"; then
    AC_DEFINE(AP_NONBLOCK_WHEN_MULTI_LISTEN, 1, 
              [Listening sockets are non-blocking when there are more than 1])
fi

APR_CHECK_APR_DEFINE(APR_HAVE_IPV6)

AC_ARG_ENABLE(v4-mapped,APACHE_HELP_STRING(--enable-v4-mapped,Allow IPv6 sockets to handle IPv4 connections),
[ 
  v4mapped=$enableval
],
[
    case $host in
    *freebsd5*|*netbsd*|*openbsd*)
        v4mapped=no
        ;;
    *)
        v4mapped=yes
        ;;
    esac
    if ap_mpm_is_enabled winnt; then
        dnl WinNT MPM doesn't support this.
        v4mapped=no
    fi
])

if test $v4mapped = "yes" -a $ac_cv_define_APR_HAVE_IPV6 = "yes"; then
    AC_DEFINE(AP_ENABLE_V4_MAPPED, 1,
              [Allow IPv4 connections on IPv6 listening sockets])
fi

APACHE_FAST_OUTPUT(Makefile modules/Makefile srclib/Makefile) 
APACHE_FAST_OUTPUT(os/Makefile server/Makefile)
APACHE_FAST_OUTPUT(support/Makefile)

if test -d ./test; then
    APACHE_FAST_OUTPUT(test/Makefile)
fi

dnl ## Finalize the variables
echo $ac_n "${nl}Restore user-defined environment settings...${nl}"

APR_RESTORE_THE_ENVIRONMENT(CPPFLAGS, EXTRA_)
APR_RESTORE_THE_ENVIRONMENT(CFLAGS, EXTRA_)
APR_RESTORE_THE_ENVIRONMENT(CXXFLAGS, EXTRA_)
APR_RESTORE_THE_ENVIRONMENT(LDFLAGS, EXTRA_)
APR_RESTORE_THE_ENVIRONMENT(LIBS, EXTRA_)
APR_RESTORE_THE_ENVIRONMENT(INCLUDES, EXTRA_)

echo $ac_n "${nl}Construct makefiles and header files...${nl}"

APACHE_GEN_CONFIG_VARS

dnl ## Build modules.c
rm -f modules.c
echo $MODLIST | $AWK -f $srcdir/build/build-modules-c.awk > modules.c

APR_EXPAND_VAR(ap_prefix, $prefix)
AC_DEFINE_UNQUOTED(HTTPD_ROOT, "${ap_prefix}",
	[Root directory of the Apache install area])
AC_DEFINE_UNQUOTED(SERVER_CONFIG_FILE, "${rel_sysconfdir}/${progname}.conf",
	[Location of the config file, relative to the Apache root directory])
AC_DEFINE_UNQUOTED(AP_TYPES_CONFIG_FILE, "${rel_sysconfdir}/mime.types",
	[Location of the MIME types config file, relative to the Apache root directory])

perlbin=`$ac_aux_dir/PrintPath perl`
if test "x$perlbin" = "x"; then
    perlbin="/replace/with/path/to/perl/interpreter"
fi
AC_SUBST(perlbin)

dnl If we are running on BSD/OS, we need to use the BSD .include syntax.

BSD_MAKEFILE=no
ap_make_include=include
ap_make_delimiter=' '
case $host in
*bsdi*)
    # Check whether they've installed GNU make
    if make --version > /dev/null 2>&1; then
        true
    else
        BSD_MAKEFILE=yes
        ap_make_include=.include
        ap_make_delimiter='"'
    fi
    ;;
esac
AC_SUBST(ap_make_include)
AC_SUBST(ap_make_delimiter)

dnl Ensure that docs/conf is created.
test -d docs/conf||$mkdir_p docs/conf

dnl Ensure that the httpd version is included
HTTPD_VERSION=`$abs_srcdir/build/get-version.sh all $abs_srcdir/include/ap_release.h AP_SERVER`
AC_SUBST(HTTPD_VERSION)

AC_OUTPUT($APACHE_OUTPUT_FILES docs/conf/httpd.conf docs/conf/extra/httpd-autoindex.conf docs/conf/extra/httpd-dav.conf docs/conf/extra/httpd-default.conf docs/conf/extra/httpd-info.conf docs/conf/extra/httpd-languages.conf docs/conf/extra/httpd-manual.conf docs/conf/extra/httpd-mpm.conf docs/conf/extra/httpd-multilang-errordoc.conf docs/conf/extra/httpd-ssl.conf docs/conf/extra/httpd-userdir.conf docs/conf/extra/httpd-vhosts.conf include/ap_config_layout.h support/apxs support/apachectl support/dbmmanage support/envvars-std support/log_server_status support/logresolve.pl support/phf_abuse_log.cgi support/split-logfile build/rules.mk build/pkg/pkginfo build/config_vars.sh,[true],[
  APACHE_GEN_MAKEFILES
])