# configure.lib
# a library of shell routines for simple autoconf system
#

set -e
ac_substitutes=
rm -f conftest* config.log
exec 5>config.log
cat <<EOF >&5
This file contains any messages produced by compilers etc while
running configure, to aid debugging if configure script makes a mistake.

EOF

case `echo "a\c"` in
  *c*) ac_en=-n ac_ec= ;;
  *)   ac_en= ac_ec='\c' ;;
esac

##### Messages
ac_msg() {
  echo $ac_en "$*... $ac_ec"
  echo ">>> $*" >&5
}
ac_checking() {
  echo $ac_en "checking $*... $ac_ec"
  echo ">>> checking $*" >&5
}
ac_result() {
  echo "$1"
  echo "=== $1" >&5
}
ac_fatal() {
  echo "configure: fatal: $*" >&2
  echo "=== FATAL: $*" >&5
  exit 1
}
ac_warning() {
  echo "configure: warning: $*" >&2
  echo "=== WARNING: $*" >&5
}

# ac_run command...
# captures output in conftest.out
ac_run() {
  # apparently UnixWare (for one) /bin/sh optimizes the following "if"
  # "away", by checking if there's such a command BEFORE redirecting
  # output.  So error message (like "gcc: command not found") goes
  # to stderr instead of to conftest.out, and `cat conftest.out' below
  # fails.
  if "$@" >conftest.out 2>&1; then
    return 0
  else
    echo "==== Command invocation failed. Command line was:" >&5
    echo "$*" >&5
    echo "==== compiler input was:" >&5
    cat conftest.c >&5
    echo "==== output was:" >&5
    cat conftest.out >&5
    echo "====" >&5
    return 1
  fi
}

# ac_verbose "feature" "ok" "bad" command...
ac_verbose() {
  ac_checking "$1"
  ok=$2 bad=$3; shift 3
  if "$@"; then
    ac_result $ok
    return 0
  else
    ac_result $bad
    return 1
  fi
}

# common case for ac_verbose: yes/no result
ac_yesno() {
  ac_checking "$1"
  shift
  if "$@"; then
    ac_result yes
    return 0
  else
    ac_result no
    return 1
  fi
}

ac_subst() {
  ac_substitutes="$ac_substitutes $*"
}

ac_define() {
  if [ -f confdefs.h ]; then
    echo "#define $1	${2:-1}" >>confdefs.h
  else
    CDEFS="$CDEFS -D$1=${2:-1}"
  fi
}

##### Compiling, linking

# run a compiler
ac_run_compiler() {
  rm -f conftest*; cat >conftest.c
  ac_run $CC $CFLAGS "$@" conftest.c
}

ac_compile() {
  ac_run_compiler -c
}
ac_compile_v() {
  what="$1"; shift
  ac_yesno "$what" ac_compile "$@"
}

ac_link() {
  ac_run_compiler -o conftest $LIBS "$@"
}

ac_link_v() {
  what="$1"; shift
  ac_yesno "$what" ac_link "$@"
}

ac_cpp() {
  ac_run_compiler -E "$@"
}
ac_cpp_v() {
  what="$1"; shift
  ac_yesno "$what" ac_cpp "$@"
}

### check for C compiler.  Set $CC, $CFLAGS etc
ac_prog_c_compiler() {
  ac_checking "for C compiler"
  rm -f conftest*
  echo 'int main(int argc, char **argv) { return 0; }' >conftest.c

  if [ -n "$CC" ]; then
    if ac_run $CC -o conftest conftest.c && ac_run ./conftest; then
      ac_result "\$CC ($CC)"
    else
      ac_result no
      ac_fatal "\$CC ($CC) is not a working compiler"
    fi
  else
    for cc in gcc cc ; do
      if ac_run $cc -o conftest conftest.c && ac_run ./conftest; then
        ac_result "$cc"
        CC=$cc
        break
      fi
    done
    if [ -z "$CC" ]; then
      ac_result no
      ac_fatal "no working C compiler found in \$PATH. please set \$CC variable"
    fi
  fi
  if [ -z "$CFLAGS" ]; then
    if ac_grep_cpp_v "whenever C compiler ($CC) is GNU CC" yEs <<EOF
#ifdef __GNUC__
  yEs;
#endif
EOF
    then
      CFLAGS="-Wall -W -O2 -pipe"
    else
      CFLAGS=-O
    fi
  fi
  cc="$CC $CFLAGS"
  ccld="$cc"
  if [ -n "$LDFLAGS" ]; then ccld="$ccld $LDFLAGS"; fi
  if [ -n "$LIBS" ]; then ccld="$ccld $LIBS"; fi
  if ac_yesno "whenever the C compiler ($ccld)
           can produce executables" \
     ac_compile_run <<EOF
int main() { return 0; }
EOF
  then :
  else
    ac_fatal "no working C compiler found"
  fi
  LD='$(CC)'
  [ -n "$AR" ] || AR=ar
  [ -n "$ARFLAGS" ] || ARFLAGS=rv
  [ -n "$AWK" ] || AWK=awk
  ac_substitutes="$ac_substitutes CC CFLAGS LD LDFLAGS LIBS AR ARFLAGS AWK"
}


ac_prog_ranlib() {
  ac_checking "for ranlib"
  if [ -n "$RANLIB" ]; then
    ac_result "\$RANLIB ($RANLIB)"
  else
    ifs="$IFS"
    IFS=:
    for dir in $PATH; do
      [ -n "$dir" ] || dir=.
      if [ -f $dir/ranlib ]; then
        RANLIB=ranlib
        break
      fi
    done
    IFS="$ifs"
    if [ -z "$RANLIB" ]; then ac_result no; RANLIB=:
    else ac_result "$RANLIB"
    fi
  fi
  ac_substitutes="$ac_substitutes RANLIB"
}

ac_header_check_v() {
  ac_cpp_v "for $1" <<EOF
#include <$1>
EOF
}

ac_library_find_v() {
  ac_checking "for libraries needed for $1"
  shift
  fond=
  rm -f conftest*; cat >conftest.c
  for lib in "$@"; do
    if ac_run $CC $CFLAGS $LDFLAGS conftest.c -o conftest $LIBS $lib; then
      found=y
      break
    fi
  done
  if [ ! "$found" ]; then
    ac_result "not found"
    return 1
  fi
  if [ -z "$lib" ]; then
    ac_result "ok (none needed)"
  else
    ac_result "ok ($lib)"
    LIBS="$LIBS $lib"
  fi
}

ac_compile_run() {
  ac_link "$@" && ac_run ./conftest
}

ac_compile_run_v() {
  what="$1"; shift
  ac_yesno "$what" ac_compile_run "$@"
}

ac_grep_cpp() {
  pattern="$1"; shift
  ac_cpp "$@" && grep "$pattern" conftest.out >/dev/null
}
ac_grep_cpp_v() {
  ac_yesno "$1" ac_grep_cpp "$2"
}

ac_output() {
  for var in $ac_substitutes; do
    eval echo "\"s|@$var@|\$$var|\""
  done >conftest.sed
  for file in "$@"; do
    ac_msg "creating $file"
    if [ -f $file.in ]; then
      sed -f conftest.sed $file.in > $file.tmp
      mv -f $file.tmp $file
      ac_result ok
    else
      ac_result failed
      ac_fatal "$file.in not found"
    fi
  done
  rm -f conftest*
}