configure

这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

  SET_MAKE="MAKE=${MAKE-make}"
fi

# Use ed_PROGRAM, not ED_PROGRAM,
# because <errno.h> reserves symbols starting with `E'.
# Extract the first word of "ed", so it can be a program name with args.
set dummy ed; ac_word=$2
echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
echo "configure:890: checking for $ac_word" >&5
if eval "test \"`echo '$''{'ac_cv_path_ed_PROGRAM'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  case "$ed_PROGRAM" in
  /*)
  ac_cv_path_ed_PROGRAM="$ed_PROGRAM" # Let the user override the test with a path.
  ;;
  *)
  IFS="${IFS= 	}"; ac_save_ifs="$IFS"; IFS="${IFS}:"
  for ac_dir in $PATH; do
    test -z "$ac_dir" && ac_dir=.
    if test -f $ac_dir/$ac_word; then
      ac_cv_path_ed_PROGRAM="$ac_dir/$ac_word"
      break
    fi
  done
  IFS="$ac_save_ifs"
  test -z "$ac_cv_path_ed_PROGRAM" && ac_cv_path_ed_PROGRAM="ed"
  ;;
esac
fi
ed_PROGRAM="$ac_cv_path_ed_PROGRAM"
if test -n "$ed_PROGRAM"; then
  echo "$ac_t""$ed_PROGRAM" 1>&6
else
  echo "$ac_t""no" 1>&6
fi


# If available, prefer support for large files unless the user specified
# one of the CPPFLAGS, LDFLAGS, or LIBS variables.
echo $ac_n "checking whether large file support needs explicit enabling""... $ac_c" 1>&6
echo "configure:923: checking whether large file support needs explicit enabling" >&5
ac_getconfs=''
ac_result=yes
ac_set=''
ac_shellvars='CPPFLAGS LDFLAGS LIBS'
for ac_shellvar in $ac_shellvars; do
  case $ac_shellvar in
  CPPFLAGS) ac_lfsvar=LFS_CFLAGS ;;
  *) ac_lfsvar=LFS_$ac_shellvar ;;
  esac
  eval test '"${'$ac_shellvar'+set}"' = set && ac_set=$ac_shellvar
  (getconf $ac_lfsvar) >/dev/null 2>&1 || { ac_result=no; break; }
  ac_getconf=`getconf $ac_lfsvar`
  ac_getconfs=$ac_getconfs$ac_getconf
  eval ac_test_$ac_shellvar=\$ac_getconf
done
case "$ac_result$ac_getconfs" in
yes) ac_result=no ;;
esac
case "$ac_result$ac_set" in
yes?*) ac_result="yes, but $ac_set is already set, so use its settings"
esac
echo "$ac_t""$ac_result" 1>&6
case $ac_result in
yes)
  for ac_shellvar in $ac_shellvars; do
    eval $ac_shellvar=\$ac_test_$ac_shellvar
  done ;;
esac

echo $ac_n "checking for AIX""... $ac_c" 1>&6
echo "configure:954: checking for AIX" >&5
cat > conftest.$ac_ext <<EOF
#line 956 "configure"
#include "confdefs.h"
#ifdef _AIX
  yes
#endif

EOF
if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
  egrep "yes" >/dev/null 2>&1; then
  rm -rf conftest*
  echo "$ac_t""yes" 1>&6; cat >> confdefs.h <<\EOF
#define _ALL_SOURCE 1
EOF

else
  rm -rf conftest*
  echo "$ac_t""no" 1>&6
fi
rm -f conftest*


ac_safe=`echo "minix/config.h" | sed 'y%./+-%__p_%'`
echo $ac_n "checking for minix/config.h""... $ac_c" 1>&6
echo "configure:979: checking for minix/config.h" >&5
if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  cat > conftest.$ac_ext <<EOF
#line 984 "configure"
#include "confdefs.h"
#include <minix/config.h>
EOF
ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
{ (eval echo configure:989: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
ac_err=`grep -v '^ *+' conftest.out`
if test -z "$ac_err"; then
  rm -rf conftest*
  eval "ac_cv_header_$ac_safe=yes"
else
  echo "$ac_err" >&5
  echo "configure: failed program was:" >&5
  cat conftest.$ac_ext >&5
  rm -rf conftest*
  eval "ac_cv_header_$ac_safe=no"
fi
rm -f conftest*
fi
if eval "test \"`echo '$ac_cv_header_'$ac_safe`\" = yes"; then
  echo "$ac_t""yes" 1>&6
  MINIX=yes
else
  echo "$ac_t""no" 1>&6
MINIX=
fi

if test "$MINIX" = yes; then
  cat >> confdefs.h <<\EOF
#define _POSIX_SOURCE 1
EOF

  cat >> confdefs.h <<\EOF
#define _POSIX_1_SOURCE 2
EOF

  cat >> confdefs.h <<\EOF
#define _MINIX 1
EOF

fi

echo $ac_n "checking for POSIXized ISC""... $ac_c" 1>&6
echo "configure:1027: checking for POSIXized ISC" >&5
if test -d /etc/conf/kconfig.d &&
  grep _POSIX_VERSION /usr/include/sys/unistd.h >/dev/null 2>&1
then
  echo "$ac_t""yes" 1>&6
  ISC=yes # If later tests want to check for ISC.
  cat >> confdefs.h <<\EOF
#define _POSIX_SOURCE 1
EOF

  if test "$GCC" = yes; then
    CC="$CC -posix"
  else
    CC="$CC -Xp"
  fi
else
  echo "$ac_t""no" 1>&6
  ISC=
fi


echo $ac_n "checking for working const""... $ac_c" 1>&6
echo "configure:1049: checking for working const" >&5
if eval "test \"`echo '$''{'ac_cv_c_const'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  cat > conftest.$ac_ext <<EOF
#line 1054 "configure"
#include "confdefs.h"

int main() {

/* Ultrix mips cc rejects this.  */
typedef int charset[2]; const charset x;
/* SunOS 4.1.1 cc rejects this.  */
char const *const *ccp;
char **p;
/* NEC SVR4.0.2 mips cc rejects this.  */
struct point {int x, y;};
static struct point const zero = {0,0};
/* AIX XL C 1.02.0.0 rejects this.
   It does not let you subtract one const X* pointer from another in an arm
   of an if-expression whose if-part is not a constant expression */
const char *g = "string";
ccp = &g + (g ? g-g : 0);
/* HPUX 7.0 cc rejects these. */
++ccp;
p = (char**) ccp;
ccp = (char const *const *) p;
{ /* SCO 3.2v4 cc rejects this.  */
  char *t;
  char const *s = 0 ? (char *) 0 : (char const *) 0;

  *t++ = 0;
}
{ /* Someone thinks the Sun supposedly-ANSI compiler will reject this.  */
  int x[] = {25, 17};
  const int *foo = &x[0];
  ++foo;
}
{ /* Sun SC1.0 ANSI compiler rejects this -- but not the above. */
  typedef const int *iptr;
  iptr p = 0;
  ++p;
}
{ /* AIX XL C 1.02.0.0 rejects this saying
     "k.c", line 2.27: 1506-025 (S) Operand must be a modifiable lvalue. */
  struct s { int j; const int *ap[3]; };
  struct s *b; b->j = 5;
}
{ /* ULTRIX-32 V3.1 (Rev 9) vcc rejects this */
  const int foo = 10;
}

; return 0; }
EOF
if { (eval echo configure:1103: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
  rm -rf conftest*
  ac_cv_c_const=yes
else
  echo "configure: failed program was:" >&5
  cat conftest.$ac_ext >&5
  rm -rf conftest*
  ac_cv_c_const=no
fi
rm -f conftest*
fi

echo "$ac_t""$ac_cv_c_const" 1>&6
if test $ac_cv_c_const = no; then
  cat >> confdefs.h <<\EOF
#define const 
EOF

fi


ac_header_dirent=no
for ac_hdr in dirent.h sys/ndir.h sys/dir.h ndir.h
do
ac_safe=`echo "$ac_hdr" | sed 'y%./+-%__p_%'`
echo $ac_n "checking for $ac_hdr that defines DIR""... $ac_c" 1>&6
echo "configure:1129: checking for $ac_hdr that defines DIR" >&5
if eval "test \"`echo '$''{'ac_cv_header_dirent_$ac_safe'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  cat > conftest.$ac_ext <<EOF
#line 1134 "configure"
#include "confdefs.h"
#include <sys/types.h>
#include <$ac_hdr>
int main() {
DIR *dirp = 0;
; return 0; }
EOF
if { (eval echo configure:1142: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
  rm -rf conftest*
  eval "ac_cv_header_dirent_$ac_safe=yes"
else
  echo "configure: failed program was:" >&5
  cat conftest.$ac_ext >&5
  rm -rf conftest*
  eval "ac_cv_header_dirent_$ac_safe=no"
fi
rm -f conftest*
fi
if eval "test \"`echo '$ac_cv_header_dirent_'$ac_safe`\" = yes"; then
  echo "$ac_t""yes" 1>&6
    ac_tr_hdr=HAVE_`echo $ac_hdr | sed 'y%abcdefghijklmnopqrstuvwxyz./-%ABCDEFGHIJKLMNOPQRSTUVWXYZ___%'`
  cat >> confdefs.h <<EOF
#define $ac_tr_hdr 1
EOF
 ac_header_dirent=$ac_hdr; break
else
  echo "$ac_t""no" 1>&6
fi
done
# Two versions of opendir et al. are in -ldir and -lx on SCO Xenix.
if test $ac_header_dirent = dirent.h; then
echo $ac_n "checking for opendir in -ldir""... $ac_c" 1>&6
echo "configure:1167: checking for opendir in -ldir" >&5
ac_lib_var=`echo dir'_'opendir | sed 'y%./+-%__p_%'`
if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  ac_save_LIBS="$LIBS"
LIBS="-ldir  $LIBS"
cat > conftest.$ac_ext <<EOF
#line 1175 "configure"
#include "confdefs.h"
/* Override any gcc2 internal prototype to avoid an error.  */
/* We use char because int might match the return type of a gcc2
    builtin and then its argument prototype would still apply.  */
char opendir();

int main() {
opendir()
; return 0; }
EOF
if { (eval echo configure:1186: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest; then
  rm -rf conftest*
  eval "ac_cv_lib_$ac_lib_var=yes"
else
  echo "configure: failed program was:" >&5
  cat conftest.$ac_ext >&5
  rm -rf conftest*
  eval "ac_cv_lib_$ac_lib_var=no"
fi
rm -f conftest*
LIBS="$ac_save_LIBS"

fi
if eval "test \"`echo '$ac_cv_lib_'$ac_lib_var`\" = yes"; then
  echo "$ac_t""yes" 1>&6
  LIBS="$LIBS -ldir"
else
  echo "$ac_t""no" 1>&6
fi

else
echo $ac_n "checking for opendir in -lx""... $ac_c" 1>&6
echo "configure:1208: checking for opendir in -lx" >&5
ac_lib_var=`echo x'_'opendir | sed 'y%./+-%__p_%'`
if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  ac_save_LIBS="$LIBS"
LIBS="-lx  $LIBS"
cat > conftest.$ac_ext <<EOF
#line 1216 "configure"
#include "confdefs.h"
/* Override any gcc2 internal prototype to avoid an error.  */
/* We use char because int might match the return type of a gcc2
    builtin and then its argument prototype would still apply.  */
char opendir();

int main() {
opendir()
; return 0; }
EOF
if { (eval echo configure:1227: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest; then
  rm -rf conftest*
  eval "ac_cv_lib_$ac_lib_var=yes"
else
  echo "configure: failed program was:" >&5
  cat conftest.$ac_ext >&5
  rm -rf conftest*
  eval "ac_cv_lib_$ac_lib_var=no"
fi
rm -f conftest*
LIBS="$ac_save_LIBS"

fi
if eval "test \"`echo '$ac_cv_lib_'$ac_lib_var`\" = yes"; then
  echo "$ac_t""yes" 1>&6
  LIBS="$LIBS -lx"
else
  echo "$ac_t""no" 1>&6
fi

fi

echo $ac_n "checking for ANSI C header files""... $ac_c" 1>&6
echo "configure:1250: checking for ANSI C header files" >&5
if eval "test \"`echo '$''{'ac_cv_header_stdc'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  cat > conftest.$ac_ext <<EOF
#line 1255 "configure"
#include "confdefs.h"
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <float.h>
EOF
ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
{ (eval echo configure:1263: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
ac_err=`grep -v '^ *+' conftest.out`
if test -z "$ac_err"; then
  rm -rf conftest*
  ac_cv_header_stdc=yes
else
  echo "$ac_err" >&5
  echo "configure: failed program was:" >&5
  cat conftest.$ac_ext >&5
  rm -rf conftest*
  ac_cv_header_stdc=no
fi
rm -f conftest*

if test $ac_cv_header_stdc = yes; then
  # SunOS 4.x string.h does not declare mem*, contrary to ANSI.
cat > conftest.$ac_ext <<EOF
#line 1280 "configure"
#include "confdefs.h"
#include <string.h>
EOF
if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
  egrep "memchr" >/dev/null 2>&1; then
  :
else
  rm -rf conftest*
  ac_cv_header_stdc=no
fi
rm -f conftest*

fi

if test $ac_cv_header_stdc = yes; then
  # ISC 2.0.2 stdlib.h does not declare free, contrary to ANSI.
cat > conftest.$ac_ext <<EOF
#line 1298 "configure"
#include "confdefs.h"
#include <stdlib.h>
EOF
if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
  egrep "free" >/dev/null 2>&1; then
  :
else
  rm -rf conftest*
  ac_cv_header_stdc=no
fi
rm -f conftest*

fi

if test $ac_cv_header_stdc = yes; then
  # /bin/cc in Irix-4.0.5 gets non-ANSI ctype macros unless using -ansi.
if test "$cross_compiling" = yes; then
  :
else
  cat > conftest.$ac_ext <<EOF
#line 1319 "configure"
#include "confdefs.h"
#include <ctype.h>