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

#define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
#define TOUPPER(c) (ISLOWER(c) ? 'A' + ((c) - 'a') : (c))
#define XOR(e, f) (((e) && !(f)) || (!(e) && (f)))
int main () { int i; for (i = 0; i < 256; i++)
if (XOR (islower (i), ISLOWER (i)) || toupper (i) != TOUPPER (i)) exit(2);
exit (0); }

EOF
if { (eval echo configure:1330: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest && (./conftest; exit) 2>/dev/null
then
  :
else
  echo "configure: failed program was:" >&5
  cat conftest.$ac_ext >&5
  rm -fr conftest*
  ac_cv_header_stdc=no
fi
rm -fr conftest*
fi

fi
fi

echo "$ac_t""$ac_cv_header_stdc" 1>&6
if test $ac_cv_header_stdc = yes; then
  cat >> confdefs.h <<\EOF
#define STDC_HEADERS 1
EOF

fi

for ac_hdr in fcntl.h limits.h string.h unistd.h utime.h varargs.h
do
ac_safe=`echo "$ac_hdr" | sed 'y%./+-%__p_%'`
echo $ac_n "checking for $ac_hdr""... $ac_c" 1>&6
echo "configure:1357: checking for $ac_hdr" >&5
if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  cat > conftest.$ac_ext <<EOF
#line 1362 "configure"
#include "confdefs.h"
#include <$ac_hdr>
EOF
ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
{ (eval echo configure:1367: \"$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
    ac_tr_hdr=HAVE_`echo $ac_hdr | sed 'y%abcdefghijklmnopqrstuvwxyz./-%ABCDEFGHIJKLMNOPQRSTUVWXYZ___%'`
  cat >> confdefs.h <<EOF
#define $ac_tr_hdr 1
EOF
 
else
  echo "$ac_t""no" 1>&6
fi
done


echo $ac_n "checking for mode_t""... $ac_c" 1>&6
echo "configure:1395: checking for mode_t" >&5
if eval "test \"`echo '$''{'ac_cv_type_mode_t'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  cat > conftest.$ac_ext <<EOF
#line 1400 "configure"
#include "confdefs.h"
#include <sys/types.h>
#if STDC_HEADERS
#include <stdlib.h>
#include <stddef.h>
#endif
EOF
if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
  egrep "mode_t[^a-zA-Z_0-9]" >/dev/null 2>&1; then
  rm -rf conftest*
  ac_cv_type_mode_t=yes
else
  rm -rf conftest*
  ac_cv_type_mode_t=no
fi
rm -f conftest*

fi
echo "$ac_t""$ac_cv_type_mode_t" 1>&6
if test $ac_cv_type_mode_t = no; then
  cat >> confdefs.h <<\EOF
#define mode_t int
EOF

fi

echo $ac_n "checking for off_t""... $ac_c" 1>&6
echo "configure:1428: checking for off_t" >&5
if eval "test \"`echo '$''{'ac_cv_type_off_t'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  cat > conftest.$ac_ext <<EOF
#line 1433 "configure"
#include "confdefs.h"
#include <sys/types.h>
#if STDC_HEADERS
#include <stdlib.h>
#include <stddef.h>
#endif
EOF
if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
  egrep "off_t[^a-zA-Z_0-9]" >/dev/null 2>&1; then
  rm -rf conftest*
  ac_cv_type_off_t=yes
else
  rm -rf conftest*
  ac_cv_type_off_t=no
fi
rm -f conftest*

fi
echo "$ac_t""$ac_cv_type_off_t" 1>&6
if test $ac_cv_type_off_t = no; then
  cat >> confdefs.h <<\EOF
#define off_t long
EOF

fi

echo $ac_n "checking return type of signal handlers""... $ac_c" 1>&6
echo "configure:1461: checking return type of signal handlers" >&5
if eval "test \"`echo '$''{'ac_cv_type_signal'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  cat > conftest.$ac_ext <<EOF
#line 1466 "configure"
#include "confdefs.h"
#include <sys/types.h>
#include <signal.h>
#ifdef signal
#undef signal
#endif
#ifdef __cplusplus
extern "C" void (*signal (int, void (*)(int)))(int);
#else
void (*signal ()) ();
#endif

int main() {
int i;
; return 0; }
EOF
if { (eval echo configure:1483: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
  rm -rf conftest*
  ac_cv_type_signal=void
else
  echo "configure: failed program was:" >&5
  cat conftest.$ac_ext >&5
  rm -rf conftest*
  ac_cv_type_signal=int
fi
rm -f conftest*
fi

echo "$ac_t""$ac_cv_type_signal" 1>&6
cat >> confdefs.h <<EOF
#define RETSIGTYPE $ac_cv_type_signal
EOF


echo $ac_n "checking for size_t""... $ac_c" 1>&6
echo "configure:1502: checking for size_t" >&5
if eval "test \"`echo '$''{'ac_cv_type_size_t'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  cat > conftest.$ac_ext <<EOF
#line 1507 "configure"
#include "confdefs.h"
#include <sys/types.h>
#if STDC_HEADERS
#include <stdlib.h>
#include <stddef.h>
#endif
EOF
if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
  egrep "size_t[^a-zA-Z_0-9]" >/dev/null 2>&1; then
  rm -rf conftest*
  ac_cv_type_size_t=yes
else
  rm -rf conftest*
  ac_cv_type_size_t=no
fi
rm -f conftest*

fi
echo "$ac_t""$ac_cv_type_size_t" 1>&6
if test $ac_cv_type_size_t = no; then
  cat >> confdefs.h <<\EOF
#define size_t unsigned
EOF

fi


echo $ac_n "checking for struct utimbuf""... $ac_c" 1>&6
echo "configure:1536: checking for struct utimbuf" >&5
if eval "test \"`echo '$''{'patch_cv_sys_struct_utimbuf'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  cat > conftest.$ac_ext <<EOF
#line 1541 "configure"
#include "confdefs.h"
#include <sys/types.h>
#if HAVE_UTIME_H
#include <utime.h>
#endif
int main() {
static struct utimbuf x; x.actime = x.modtime;
; return 0; }
EOF
if { (eval echo configure:1551: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
  rm -rf conftest*
  patch_cv_sys_struct_utimbuf=yes
else
  echo "configure: failed program was:" >&5
  cat conftest.$ac_ext >&5
  rm -rf conftest*
  patch_cv_sys_struct_utimbuf=no
fi
rm -f conftest*
fi

echo "$ac_t""$patch_cv_sys_struct_utimbuf" 1>&6
if test $patch_cv_sys_struct_utimbuf = yes; then
   cat >> confdefs.h <<\EOF
#define HAVE_STRUCT_UTIMBUF 1
EOF

fi

# Check for NetBSD 1.0 bug, where memchr(..., 0) returns nonzero.
echo $ac_n "checking for working memchr""... $ac_c" 1>&6
echo "configure:1573: checking for working memchr" >&5
if eval "test \"`echo '$''{'ac_cv_func_memchr'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  if test "$cross_compiling" = yes; then
  echo "configure: warning: We are cross-compiling so we assume memchr does not work." 1>&2
  ac_cv_func_memchr=no
else
  cat > conftest.$ac_ext <<EOF
#line 1582 "configure"
#include "confdefs.h"
#include <string.h>
main () { exit (memchr ("", 0, 0) != 0 || memchr ("", 1, 0) != 0); }
EOF
if { (eval echo configure:1587: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest && (./conftest; exit) 2>/dev/null
then
  ac_cv_func_memchr=yes
else
  echo "configure: failed program was:" >&5
  cat conftest.$ac_ext >&5
  rm -fr conftest*
  ac_cv_func_memchr=no
fi
rm -fr conftest*
fi

fi
echo "$ac_t""$ac_cv_func_memchr" 1>&6
if test $ac_cv_func_memchr = yes; then
  cat >> confdefs.h <<\EOF
#define HAVE_MEMCHR 1
EOF

fi

echo $ac_n "checking for getopt_long""... $ac_c" 1>&6
echo "configure:1609: checking for getopt_long" >&5
if eval "test \"`echo '$''{'ac_cv_func_getopt_long'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  cat > conftest.$ac_ext <<EOF
#line 1614 "configure"
#include "confdefs.h"
/* System header to define __stub macros and hopefully few prototypes,
    which can conflict with char getopt_long(); below.  */
#include <assert.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 getopt_long();

int main() {

/* The GNU C library defines this for functions which it implements
    to always fail with ENOSYS.  Some functions are actually named
    something starting with __ and the normal name is an alias.  */
#if defined (__stub_getopt_long) || defined (__stub___getopt_long)
choke me
#else
getopt_long();
#endif

; return 0; }
EOF
if { (eval echo configure:1637: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest; then
  rm -rf conftest*
  eval "ac_cv_func_getopt_long=yes"
else
  echo "configure: failed program was:" >&5
  cat conftest.$ac_ext >&5
  rm -rf conftest*
  eval "ac_cv_func_getopt_long=no"
fi
rm -f conftest*
fi

if eval "test \"`echo '$ac_cv_func_'getopt_long`\" = yes"; then
  echo "$ac_t""yes" 1>&6
  :
else
  echo "$ac_t""no" 1>&6
LIBOBJS="$LIBOBJS getopt1.o getopt.o"
fi


for ac_func in _doprintf isascii memcmp mkdir mktemp pathconf raise sigaction sigprocmask sigsetmask
do
echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
echo "configure:1661: checking for $ac_func" >&5
if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  cat > conftest.$ac_ext <<EOF
#line 1666 "configure"
#include "confdefs.h"
/* System header to define __stub macros and hopefully few prototypes,
    which can conflict with char $ac_func(); below.  */
#include <assert.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 $ac_func();

int main() {

/* The GNU C library defines this for functions which it implements
    to always fail with ENOSYS.  Some functions are actually named
    something starting with __ and the normal name is an alias.  */
#if defined (__stub_$ac_func) || defined (__stub___$ac_func)
choke me
#else
$ac_func();
#endif

; return 0; }
EOF
if { (eval echo configure:1689: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest; then
  rm -rf conftest*
  eval "ac_cv_func_$ac_func=yes"
else
  echo "configure: failed program was:" >&5
  cat conftest.$ac_ext >&5
  rm -rf conftest*
  eval "ac_cv_func_$ac_func=no"
fi
rm -f conftest*
fi

if eval "test \"`echo '$ac_cv_func_'$ac_func`\" = yes"; then
  echo "$ac_t""yes" 1>&6
    ac_tr_func=HAVE_`echo $ac_func | tr 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'`
  cat >> confdefs.h <<EOF
#define $ac_tr_func 1
EOF
 
else
  echo "$ac_t""no" 1>&6
fi
done

for ac_func in memchr rename
do
echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
echo "configure:1716: checking for $ac_func" >&5
if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  cat > conftest.$ac_ext <<EOF
#line 1721 "configure"
#include "confdefs.h"
/* System header to define __stub macros and hopefully few prototypes,
    which can conflict with char $ac_func(); below.  */
#include <assert.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 $ac_func();

int main() {

/* The GNU C library defines this for functions which it implements
    to always fail with ENOSYS.  Some functions are actually named
    something starting with __ and the normal name is an alias.  */
#if defined (__stub_$ac_func) || defined (__stub___$ac_func)
choke me
#else
$ac_func();
#endif

; return 0; }
EOF
if { (eval echo configure:1744: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest; then
  rm -rf conftest*
  eval "ac_cv_func_$ac_func=yes"
else
  echo "configure: failed program was:" >&5
  cat conftest.$ac_ext >&5
  rm -rf conftest*
  eval "ac_cv_func_$ac_func=no"
fi
rm -f conftest*
fi

if eval "test \"`echo '$ac_cv_func_'$ac_func`\" = yes"; then
  echo "$ac_t""yes" 1>&6
    ac_tr_func=HAVE_`echo $ac_func | tr 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'`
  cat >> confdefs.h <<EOF
#define $ac_tr_func 1
EOF