configure

#!/bin/sh

cd `dirname "$0"`
. package/info

# Helper functions

usage () {
  cat <<EOF
Usage: $0 [OPTION]... [TARGET]

Defaults for the options are specified in brackets.

System types:
  --target=TARGET               configure to run on target TARGET [detected]
  --host=TARGET                 same as --target

Installation directories:
  --prefix=PREFIX               main installation prefix [/]

Fine tuning of the installation directories:
  --dynlibdir=DIR               shared library files [PREFIX/lib]
  --libdir=DIR                  static library files [PREFIX/lib]
  --includedir=DIR              include files for the C compiler [PREFIX/include]
  --sysconfdir=DIR              global configuration files [PREFIX/etc]
  --sysdepdir=DIR               sysdeps directory [PREFIX/lib/$package/sysdeps]

If no --prefix option is given, by default libdir will be /usr/lib,
includedir will be /usr/include and sysdepdir will be /usr/lib/$package/sysdeps.

Dependencies:
  --with-include=DIR            add DIR to the list of searched directories for headers
  --with-lib=DIR                add DIR to the list of searched directories for static libraries
  --with-dynlib=DIR             add DIR to the list of searched directories for shared libraries

Optional features:
  --disable-shared              do not build shared libraries [enabled]
  --disable-static              do not build static libraries [enabled]
  --disable-all-pic             do not build static libraries as PIC [enabled]
  --enable-slashpackage[=ROOT]  assume /package installation at ROOT [disabled]

$package options:
  --disable-ipv6                do not build IPv6 support [enabled]
  --enable-iopause-select       prefer select() over poll() for iopause implementation [disabled]
  --enable-tai-clock            build for a TAI-10 system clock instead of a UTC one [disabled]
  --with-default-path=PATH      default executable search path when PATH is undef [/usr/bin:/bin]

Sysdeps autodetection override:
  --with-sysdep-K=V             assume sysdep K has the value V [autodetected]

List of mandatory sysdeps to provide by hand for cross-compiling:
  devurandom (yes|no): =yes if you have a working /dev/urandom
  posixspawnearlyreturn (yes|no): =yes if you have an old glibc or otherwise bad posix_spawn
EOF
  exit 0
}

# If your system does not have printf, you can comment this, but it is
# generally not a good idea to use echo.
# See http://etalabs.net/sh_tricks.html
echo () {
  IFS=' '
  printf %s\\n "$*"
}

echon () {
  IFS=' '
  printf %s "$*"
}

quote () {
  tr '\n' ' ' <<EOF | grep '^[-[:alnum:]_=,./:]* $' >/dev/null 2>&1 && { echo "$1" ; return 0 ; }
$1
EOF
  echo "$1" | sed -e "s/'/'\\\\''/g" -e "1s/^/'/" -e "\$s/\$/'/" -e "s#^'\([-[:alnum:]_,./:]*\)=\(.*\)\$#\1='\2#" -e "s|\*/|* /|g"
}

fail () {
  echo "$*" 1>&2
  exit 1
}

fnmatch () {
  eval "case \"\$2\" in $1) return 0 ;; *) return 1 ;; esac"
}

cmdexists () {
  type "$1" >/dev/null 2>&1
}

trycc () {
  test -z "$CC_AUTO" && cmdexists "$1" && CC_AUTO="$*"
}

stripdir () {
  while eval "fnmatch '*/' \"\${$1}\"" ; do
    eval "$1=\${$1%/}"
  done
}

tryflag () {
  echo "Checking whether compiler accepts $2 ..."
  echo "typedef int x;" > "$tmpc"
  if $CC_AUTO $CPPFLAGS_POST $CFLAGS_POST "$2" -c -o "$tmpo" "$tmpc" >/dev/null 2>&1 ; then
    echo "  ... yes"
    eval "$1=\"\${$1} \$2\""
    eval "$1=\${$1# }"
    return 0
  else
    echo "  ... no"
    return 1
  fi
}

tryldflag () {
  echo "Checking whether linker accepts $2 ..."
  echo "typedef int x;" > "$tmpc"
  if $CC_AUTO $CPPFLAGS_POST $CFLAGS_POST $LDFLAGS_POST -nostdlib "$2" -o "$tmpe" "$tmpc" >/dev/null 2>&1 ; then
    echo "  ... yes"
    eval "$1=\"\${$1} \$2\""
    eval "$1=\${$1# }"
    return 0
  else
    echo "  ... no"
    return 1
  fi
}

# Sysdeps determination functions

iscached ()
{
  if test -r "$tmps" && grep -q "^${1}: " "$tmps" ; then
    grep "^${1}: " "$tmps" | tail -n 1 |
    {
      IFS=' '
      read -r k v ldlibs
      if test -n "$ldlibs" ; then
        echo "  ... user-provided: $v with linker args: $ldlibs"
        echo "$ldlibs" >&3
      else
        echo "  ... user-provided: $v"
      fi
      echo "${1}: $v" >> "$sysdeps/sysdeps"
      return 0 ;
    }
  else
    return 1 ;
  fi
}

choose () {
  what="$1"
  name="$2"
  echo "Checking whether system has $3..."
  if iscached "$name" ; then return ; fi
  shift 3
  libs="$*"
  r=true
  case "$what" in
    *c*) $CC_AUTO $CPPFLAGS_AUTO $CPPFLAGS $CPPFLAGS_POST $CFLAGS_AUTO $CFLAGS $CFLAGS_POST -o "$tmpo" -c src/sysdeps/try$name.c 2>/dev/null || r=false ;;
  esac
  if $r ; then
    case "$what" in
      *l*) $CC_AUTO $CFLAGS_AUTO $CFLAGS $CFLAGS_POST $LDFLAGS_AUTO $LDFLAGS $LDFLAGS_POST -o try$name "$tmpo" $libs 2>/dev/null || r=false ;;
    esac
  fi
  if $r ; then
    case "$what" in
     *r*) if test -n "$cross" ; then
            rm -f try$name
            fail "$0: sysdep $name cannot be autodetected when cross-compiling. Please manually provide a value with the --with-sysdep-${name}=yes|no|... option."
          fi
          ./try$name >/dev/null 2>&1 ; r=$?
          case "$r" in
           111) fail "$0: test crashed, aborting." ;;
           0) r=true ;;
           *) r=false ;;
          esac
    esac
  fi
  rm -f try$name
  if $r ; then
    echo "$name: yes" >> $sysdeps/sysdeps
    echo "  ... yes"
  else
    echo "$name: no" >> $sysdeps/sysdeps
    echo "  ... no"
  fi
}

trybasic () {
  $CC_AUTO $CPPFLAGS_AUTO $CPPFLAGS $CPPFLAGS_POST $CFLAGS_AUTO $CFLAGS $CFLAGS_POST -o "$tmpo" -c "$1" 2>/dev/null
}

tryendianness () {
  echo "Checking endianness..."
  if iscached endianness ; then return ; fi
  for i in endian.h sys/endian.h machine/endian.h sys/machine.h ; do
    cat > "$tmpc" <<EOF
#undef _POSIX_C_SOURCE
#undef _XOPEN_SOURCE
#ifndef _BSD_SOURCE
#define _BSD_SOURCE
#endif
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#ifndef _DEFAULT_SOURCE
#define _DEFAULT_SOURCE
#endif
#include <$i>
int a = LITTLE_ENDIAN ;
int b = BIG_ENDIAN ;
int c = BYTE_ORDER ;
EOF
    trybasic "$tmpc" || continue
    for j in little big pdp ; do
      k=`echo $j | tr '[:lower:]' '[:upper:]'`
      cat > "$tmpc" <<EOF
#undef _POSIX_C_SOURCE
#undef _XOPEN_SOURCE
#ifndef _BSD_SOURCE
#define _BSD_SOURCE
#endif
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#ifndef _DEFAULT_SOURCE
#define _DEFAULT_SOURCE
#endif
#include <$i>
int a[BYTE_ORDER == ${k}_ENDIAN ? 1 : -1] ;
EOF
      if trybasic "$tmpc" ; then
        echo "endianness: $j" >> "$sysdeps/sysdeps"
        echo "  ... $j"
        rm -f "$tmpc"
        return
      fi
    done
    rm -f "$tmpc"
    fail "$0: error: unable to determine endianness according to $i"
  done

  for j in little big ; do
    k=`echo $j | tr '[:lower:]' '[:upper:]'`
    cat > "$tmpc" <<EOF
#include <sys/isa_defs.h>
int a = _${k}_ENDIAN +1 ;
EOF
    if trybasic "$tmpc" ; then
      echo "endianness: $j" >> "$sysdeps/sysdeps"
      echo "  ... $j"
      rm -f "$tmpc"
      return
    fi
  done
  rm -f "$tmpc"
  fail "$0: error: unable to determine endianness: no suitable endian.h found"
}

trysigned () {
  cat > "$tmpc" <<EOF
#include <sys/types.h>
int a[($1)-1 < 0 ? 1 : -1] ;
EOF
  trybasic "$tmpc"
  r=$?
  rm -f "$tmpc"
  return $r
}

trysizes () {
  t="$1" ; shift
  for arg ; do
    cat > "$tmpc" <<EOF
#include <sys/types.h>
int a[sizeof($t) == $arg ? 1 : -1] ;
EOF
    if trybasic "$tmpc" ; then
      rm -f "$tmpc"
      echo "$arg"
      return
    fi
  done
  rm -f "$tmpc"
  fail "$0: error: unable to determine the size of $t on the target"
}

trystdtype () {
  t="$1" ; shift
  iscached "sizeofu$t" || { echon "sizeofu${t}: " ; trysizes "$t" "$@" ; } >> "$sysdeps/sysdeps"
}

trytypes () {
  echo "Checking size and signedness of standard types..."
  trystdtype short 2 4
  trystdtype int 4 8 2
  trystdtype long 8 4
  for t in size uid gid pid time dev ino ; do
    iscached "signed$t" || { echon "signed${t}: " ; if trysigned "${t}_t" ; then echo "yes" ; else echo "no" ; fi ; } >> "$sysdeps/sysdeps"
    iscached "sizeof$t" || { echon "sizeof${t}: " ; trysizes "${t}_t" 4 8 2 ; } >> "$sysdeps/sysdeps"
  done  
  echo "  ... done"
}

detectlibs () {
  args=
  name=$1
  shift
  if $CC_AUTO $CPPFLAGS_AUTO $CPPFLAGS $CPPFLAGS_POST $CFLAGS_AUTO $CFLAGS $CFLAGS_POST -c -o try$name.o src/sysdeps/try$name.c 2>/dev/null ; then
    until $CC_AUTO $CFLAGS_AUTO $CFLAGS $CFLAGS_POST $LDFLAGS_AUTO $LDFLAGS $LDFLAGS_POST -o "$tmpe" try$name.o $args 2>/dev/null ; do
      if test -z "$*" ; then
        rm -f try$name.o
        return 1
      fi
      args="$args $1"
      shift
    done
    echo ${args# }
    rm -f try$name.o
    return 0
  else
    return 1
  fi
}

trylibs () {
  name="$1"
  libvar="$2"_lib
  libfile="$2".lib
  echo "Checking whether system has $3..."
  shift 3
  if { args=`iscached $name 3>&1 1>&4 4>&-` ; } 4>&1 ; then :
  elif args=`detectlibs "$name" "$@"` ; then
    echo "${name}: yes" >> "${sysdeps}/sysdeps"
    if test -z "$args" ; then
      echo "  ... yes"
    else
      echo "  ... yes, with linker args: $args"
    fi
  else
    echo "${name}: no" >> ${sysdeps}/sysdeps
    echo "  ... no"
  fi
  eval "${libvar}=\"$args\""
  echo "$args" > "${sysdeps}/$libfile"
}


# The script starts HERE.

# Initialize variables
CC_AUTO=
CPPFLAGS_AUTO="-D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=700 -Isrc/include"
CPPFLAGS_POST="$CPPFLAGS"
CPPFLAGS=
CFLAGS_AUTO="-pipe -Wall"
CFLAGS_POST="$CFLAGS"
CFLAGS="-O2"
LDFLAGS_AUTO=
LDFLAGS_POST="$LDFLAGS"
LDFLAGS=
LDFLAGS_NOSHARED=
LDFLAGS_SHARED=-shared
prefix=
dynlibdir='$prefix/lib'
libdir='$prefix/lib'
includedir='$prefix/include'
sysconfdir='$prefix/etc'
sysdepdir='$prefix/lib/$package/sysdeps'
sysdeplist=
shared=true
static=true
allpic=true
slashpackage=false
ipv6=true
select=false
taiclock=false
ddefaultpath=/usr/bin:/bin
defaultpath=$ddefaultpath
dpathorig=true
sproot=
home=
exthome=
addincpath=''
addlibspath=''
addlibdpath=''
vpaths=''
vpathd=''
build=

# Parse command line
for arg ; do
  case "$arg" in
    --help) usage ;;
    --prefix=*) prefix=${arg#*=} ;;
    --dynlibdir=*) dynlibdir=${arg#*=} ;;
    --libdir=*) libdir=${arg#*=} ;;
    --includedir=*) includedir=${arg#*=} ;;
    --sysconfdir=*) sysconfdir=${arg#*=} ;;
    --sysdepdir=*) sysdepdir=${arg#*=} ;;
    --with-include=*) var=${arg#*=} ; stripdir var ; addincpath="$addincpath -I$var" ;;
    --with-lib=*) var=${arg#*=} ; stripdir var ; addlibspath="$addlibspath -L$var" ; vpaths="$vpaths $var" ;;
    --with-dynlib=*) var=${arg#*=} ; stripdir var ; addlibdpath="$addlibdpath -L$var" ; vpathd="$vpathd $var" ;;
    --enable-shared|--enable-shared=yes) shared=true ;;
    --disable-shared|--enable-shared=no) shared=false ;;
    --enable-static|--enable-static=yes) static=true ;;
    --disable-static|--enable-static=no) static=false ;;
    --enable-all-pic|--enable-all-pic=yes) allpic=true ;;
    --disable-all-pic|--enable-all-pic=no) allpic=false ;;
    --enable-slashpackage=*) sproot=${arg#*=} ; slashpackage=true ; ;;
    --enable-slashpackage) sproot= ; slashpackage=true ;;
    --disable-slashpackage) sproot= ; slashpackage=false ;;
    --enable-ipv6|--enable-ipv6=yes) ipv6=true ;;
    --disable-ipv6|--enable-ipv6=no) ipv6=false ;;
    --enable-iopause-select|--enable-iopause-select=yes) select=true ;;
    --disable-iopause-select|--enable-iopause-select=no) select=false ;;
    --enable-tai-clock|--enable-tai-clock=yes) taiclock=true ;;
    --disable-tai-clock|--enable-tai-clock=no) taiclock=false ;;
    --enable-monotonic|--enable-monotonic=yes) echo "$0: warning: --enable-monotonic is now obsolete" 1>&2 ;;
    --disable-monotonic|--enable-monotonic=no) ;;
    --with-default-path=*) defaultpath=${arg#*=} ; dpathorig=false ;;
    --without-default-path) defaultpath=$ddefaultpath ; dpathorig=true ;;
    --with-sysdep-*=*) sysdeplist="$sysdeplist ${arg#--with-sysdep-}" ;;
    --without-sysdep-*) sysdeplist="$sysdeplist ${arg#--without-sysdep-}=no" ;; 
    --enable-*|--disable-*|--with-*|--without-*|--*dir=*) ;;
    --host=*|--target=*) target=${arg#*=} ;;
    --build=*) build=${arg#*=} ;;
    -* ) echo "$0: unknown option $arg" ;;
    *=*) eval "${arg%%=*}=\${arg#*=}" ;;
    *) target=$arg ;;
  esac
done

# Add /usr in the default default case
if test -z "$prefix" ; then
  if test "$libdir" = '$prefix/lib' ; then
    libdir=/usr/lib
  fi
  if test "$includedir" = '$prefix/include' ; then
    includedir=/usr/include
  fi
  if test "$sysdepdir" = '$prefix/lib/$package/sysdeps' ; then
    sysdepdir=/usr/lib/$package/sysdeps
  fi
fi

# Expand installation directories
stripdir prefix
for i in exec_prefix dynlibdir libdir includedir sysconfdir sysdepdir sysdepspre sproot ; do
  eval tmp=\${$i}
  eval $i=$tmp
  stripdir $i
done

# Set slashpackage values
if $slashpackage ; then
  home=${sproot}/package/${category}/${package}-${version}
  exthome=${sproot}/package/${category}/${package}
  sysdepdir=${home}/sysdeps
  binprefix=${home}/command
  extbinprefix=${exthome}/command
  dynlibdir=${home}/library.so
  libdir=${home}/library
  includedir=${home}/include
  if $dpathorig ; then
    if echo $defaultpath | tr : '\n' | grep -q '^/command$' ; then : ; else
      defaultpath="/command:$defaultpath"
    fi
  fi
fi

# Get usable temp filenames
i=0
set -C
while test "$i" -lt 50 ; do
  i=$(($i+1))
  tmpc="./tmp-configure-$$-$PPID-$i.c"
  tmpo="./tmp-configure-$$-$PPID-$i.o"
  tmpe="./tmp-configure-$$-$PPID-$i.tmp"
  tmps="./tmp-configure-$$-$PPID-$i.sysdeps"
  2>|/dev/null > "$tmpc" && break
  2>|/dev/null > "$tmpo" && break
  2>|/dev/null > "$tmpe" && break
  2>|/dev/null > "$tmps" && break
done
if test "$i" -gt 50 ; then
  fail "$0: cannot create temporary files"
fi
set +C
trap 'rm -f "$tmpc" "$tmpo" "$tmpe" "$tmps"' EXIT ABRT INT QUIT TERM HUP

# Preprocess user-provided sysdeps
rm -f "$tmps"
if test -n "$sysdeplist" ; then
  :> "$tmps"
  for i in $sysdeplist ; do
    k=${i%%=*}
    echo ${i#*=} | sed 's/,/ /g' |
    {
      read v extras
      if test -z "$k" || test -z "$v" ; then fail "$0: invalid user-provided sysdep: $i" ; fi
      if test "$v" = "true" ; then v=yes
      elif test "$v" = "false" ; then v=no
      fi
      if grep -q -e "^${k}: " "$tmps" ; then
        grep -v -e "^${k}: " "$tmps" > "$tmpe"
        mv -f "$tmpe" "$tmps"
      fi
      if test -n "$extras" ; then
        echo "${k}: $v $extras"
      else
        echo "${k}: $v"
      fi >> "$tmps"
    }
  done
fi

# Find a C compiler to use
if test -n "$target" && test x${build} != x${target} ; then
  cross=${target}-
else
  cross=
fi
echo "Checking for C compiler..."
trycc ${CC}
if test -n "$CC_AUTO" ; then
  b=`basename "$CC"`
  adjust_cross=false
  if test "$b" != "$CC" ; then
    adjust_cross=true
    echo "$0: warning: compiler $CC is declared with its own path. If it's not accessible via PATH, you will need to pass AR, RANLIB and STRIP make variables to the make invocation." 1>&2
  fi
  if test -n "$cross" ; then
    if test "$b" = "${b##$cross}" ; then
      echo "$0: warning: compiler $CC is declared as a cross-compiler for target $target but does not start with prefix ${cross}" 1>&2
    elif $adjust_cross ; then
      cross=`dirname "$CC"`/"$cross"
    fi
  fi
fi
trycc ${cross}gcc
trycc ${cross}clang
trycc ${cross}cc
test -n "$CC_AUTO" || fail "$0: cannot find a C compiler"
echo "  ... $CC_AUTO"
echo "Checking whether C compiler works... "
echo "typedef int x;" > "$tmpc"
if $CC_AUTO $CPPFLAGS_AUTO $CPPFLAGS $CPPFLAGS_POST $CFLAGS_AUTO $CFLAGS $CFLAGS_POST -c -o "$tmpo" "$tmpc" 2>"$tmpe" ; then
  echo "  ... yes"
else
  echo "  ... no. Compiler output follows:"
  cat < "$tmpe"
  exit 1
fi

echo "Checking target system type..."
if test -z "$target" ; then
  if test -n "$build" ; then
    target=$build ;
  else
    target=$($CC_AUTO -dumpmachine 2>/dev/null) || target=unknown
  fi
fi
echo "  ... $target"

# Produce automatic compilation flags
if $allpic ; then
  tryflag CPPFLAGS_AUTO -fPIC
fi
tryflag CFLAGS_AUTO -std=c99
tryflag CFLAGS -fomit-frame-pointer
tryflag CFLAGS_AUTO -fno-exceptions
tryflag CFLAGS_AUTO -fno-unwind-tables
tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables
tryflag CPPFLAGS_AUTO -Werror=implicit-function-declaration
tryflag CPPFLAGS_AUTO -Werror=implicit-int
tryflag CPPFLAGS_AUTO -Werror=pointer-sign
tryflag CPPFLAGS_AUTO -Werror=pointer-arith
tryflag CPPFLAGS_AUTO -Wno-unused-value
tryflag CPPFLAGS_AUTO -Wno-parentheses
tryflag CFLAGS_AUTO -ffunction-sections
tryflag CFLAGS_AUTO -fdata-sections
tryldflag LDFLAGS_AUTO -Wl,--as-needed
tryldflag LDFLAGS_AUTO -Wl,--sort-section=alignment
tryldflag LDFLAGS_AUTO -Wl,--sort-common
if $shared ; then
  tryldflag LDFLAGS -Wl,--hash-style=both
fi

# And now, determine a big fat batch of sysdeps.

sysdeps=sysdeps.cfg
mkdir -p $sysdeps
echo "$target" > $sysdeps/target
:> "$sysdeps/sysdeps"

util_lib=
echo > $sysdeps/util.lib

echo 'Checking required linker flags for socket functions...'
socket_lib=`detectlibs lsock -lsocket -lnsl` || fail "$0: unable to determine required linker flags for socket functions"
if test -n "$socket_lib" ; then
  echo "  ... $socket_lib"
else
  echo "  ... none"
fi
echo "$socket_lib" > $sysdeps/socket.lib

trylibs clockrt sysclock 'clock_gettime()' -lrt
choose cl clockmon CLOCK_MONOTONIC $sysclock_lib
choose cl clockboot CLOCK_BOOTTIME $sysclock_lib
trylibs posixspawn spawn 'posix_spawn()' -lrt
trylibs timer timer 'timer_create()' -lrt
trylibs pthread pthread 'pthread support' -lpthread -lrt

tryendianness
trytypes
choose cl accept4 'accept4()'
choose c cmsgcloexec 'MSG_CMSG_CLOEXEC'
choose cl dirfd 'dirfd()'
choose cl fdopendir 'fdopendir()'
choose cl eventfd 'eventfd()'
choose cl flock 'flock()'
choose cl getpeereid 'getpeereid()'
choose cl sopeercred 'SO_PEERCRED'
choose cl getpeerucred 'getpeerucred()'
choose cl ipv6 'IPv6 support' $socket_lib
choose c msgdontwait 'MSG_DONTWAIT'
choose c ocloexec 'O_CLOEXEC'
choose c odirectory 'O_DIRECTORY'
choose cl openat 'openat()'
choose cl linkat 'linkat()'
choose cl memmem 'memmem()'
choose cl pipe2 'pipe2()'
choose cl ppoll 'ppoll()'
choose cl revoke 'revoke()'
choose cl sendfile 'sendfile()'
choose cl setgroups 'setgroups()'
choose cl settimeofday 'settimeofday()'
choose cl signalfd 'signalfd()'
choose cl splice 'splice()'
choose c statim 'st.st_atim'
choose c statimespec 'st.st_atimespec'
choose cl strcasestr 'strcasestr()'
choose c strnlen 'strnlen()'
choose c uint64t 'uint64_t'
choose cl waitid 'waitid()'
choose cl futimens 'futimens()'
choose cl futimes 'futimes()'
choose cl arc4random 'arc4random()'
choose cl arc4random_addrandom 'arc4random_addrandom()'
choose cl itimer 'setitimer()'
choose cl namespaces 'namespaces'
choose cl nsgetparent 'NS_GET_PARENT'
choose cl explicit_bzero 'explicit_bzero()'
choose cl getrandom 'getrandom()'
choose cl grndinsecure 'GRND_INSECURE'
choose cl chroot 'chroot()'
choose cl clonenewpid 'clone3() with CLONE_NEWPID'
choose cl posixspawnsetsid 'POSIX_SPAWN_SETSID' $spawn_lib
choose cl posixspawnsetsidnp 'POSIX_SPAWN_SETSID_NP' $spawn_lib
choose cl posixspawnchdir 'posix_spawn_file_actions_addchdir()' $spawn_lib
choose cl posixspawnchdirnp 'posix_spawn_file_actions_addchdir_np()' $spawn_lib

# Here are the evil irreducible run-time sysdeps.
choose clr devurandom '/dev/urandom'
choose clr posixspawnearlyreturn 'posix_spawn() return early' $spawn_lib


# Finally, produce config.mak and config.h

rm -f "$tmps"
echo "Creating config.mak..."
cmdline=$(quote "$0")
for i ; do cmdline="$cmdline $(quote "$i")" ; done
exec 3>&1 1>config.mak
cat << EOF
# This file was generated by:
# $cmdline
# Any changes made here will be lost if configure is re-run.

target := $target
package := $package
prefix := $prefix
sysconfdir := $sysconfdir
sysdepdir := $sysdepdir
dynlibdir := $dynlibdir
libdir := $libdir
includedir := $includedir
sysdeps := $sysdeps
version := $version
sproot := $sproot
home := $home
exthome := ${exthome}
ipv6 := ${ipv6}
SPAWN_LIB := ${spawn_lib}
SOCKET_LIB := ${socket_lib}
SYSCLOCK_LIB := ${sysclock_lib}
TIMER_LIB := ${timer_lib}
UTIL_LIB := ${util_lib}
CC := ${CC_AUTO}
CPPFLAGS_AUTO := $CPPFLAGS_AUTO
CPPFLAGS := $CPPFLAGS $CPPFLAGS_POST
CFLAGS_AUTO := $CFLAGS_AUTO
CFLAGS := $CFLAGS $CFLAGS_POST
LDFLAGS_AUTO := $LDFLAGS_AUTO
LDFLAGS := $LDFLAGS $LDFLAGS_POST
LDFLAGS_NOSHARED := $LDFLAGS_NOSHARED
LDFLAGS_SHARED := $LDFLAGS_SHARED
CROSS_COMPILE := ${cross}
EOF
if test -n "$vpaths" ; then
  echo "vpath lib%a$vpaths"
fi
if test -n "$vpathd" ; then
  echo "vpath lib%.so$vpathd"
fi

if $static ; then
  echo "STATIC_LIBS := libskarnet.a.xyzzy"
else
  echo "STATIC_LIBS :="
fi
if $shared ; then
  echo "SHARED_LIBS := libskarnet.so.xyzzy"
else
  echo "SHARED_LIBS :="
fi
if $allpic ; then
  echo "STATIC_LIBS_ARE_PIC := 1"
else
  echo "STATIC_LIBS_ARE_PIC :="
fi

exec 1>&3 3>&-
echo "  ... done."

echo "Creating src/include/${package}/config.h..."
mkdir -p -m 0755 src/include/${package}
exec 3>&1 1> src/include/${package}/config.h
cat <<EOF
/* ISC license. */

/* Generated by: $cmdline */

#ifndef ${package_macro_name}_CONFIG_H
#define ${package_macro_name}_CONFIG_H

#define ${package_macro_name}_VERSION "$version"
#define ${package_macro_name}_DEFAULTPATH "$defaultpath"
#define ${package_macro_name}_ETC "$sysconfdir"
#define ${package_macro_name}_SPROOT "$sproot"
#define ${package_macro_name}_HOME "$home"
EOF
if $taiclock ; then
  echo "#define ${package_macro_name}_FLAG_CLOCKISTAI"
else
  echo "#undef ${package_macro_name}_FLAG_CLOCKISTAI"
fi
if $ipv6 ; then
  echo "#define ${package_macro_name}_FLAG_WANTIPV6"
else
  echo "#undef ${package_macro_name}_FLAG_WANTIPV6"
fi
if $select ; then
  echo "#define ${package_macro_name}_FLAG_PREFERSELECT"
else
  echo "#undef ${package_macro_name}_FLAG_PREFERSELECT"
fi

echo
echo "#endif"
exec 1>&3 3>&-
echo "  ... done."