configure

包含哈希,对称以及非对称的经典算法 包含经典事例

eval $ac_link
if test -s conftest && (./conftest; exit) 2>/dev/null; then
  :
else
  ac_cv_header_stdc=no
fi
fi
rm -fr conftest*
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


if test $ac_cv_header_stdc = yes; then
  cat >> confdefs.h <<\EOF
#define HAVE_ASSERT_H 1
EOF

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

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

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


else	# If non-ANSI, check for other brokenness.

for ac_hdr in assert.h limits.h stdlib.h string.h
do
ac_safe=`echo "$ac_hdr" | tr './\055' '___'`
echo $ac_n "checking for $ac_hdr""... $ac_c" 1>&6
if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  cat > conftest.$ac_ext <<EOF
#line 948 "configure"
#include "confdefs.h"
#include <$ac_hdr>
EOF
eval "$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
ac_err=`grep -v '^ *+' conftest.out`
if test -z "$ac_err"; then
  rm -rf conftest*
  eval "ac_cv_header_$ac_safe=yes"
else
  echo "$ac_err" >&5
  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 | tr 'abcdefghijklmnopqrstuvwxyz./\055' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ___'`
  cat >> confdefs.h <<EOF
#define $ac_tr_hdr 1
EOF
 
else
  echo "$ac_t""no" 1>&6
fi
done


# Do we want to include memory.h?
if test $ac_cv_header_string_h = no; then
for ac_hdr in strings.h
do
ac_safe=`echo "$ac_hdr" | tr './\055' '___'`
echo $ac_n "checking for $ac_hdr""... $ac_c" 1>&6
if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  cat > conftest.$ac_ext <<EOF
#line 987 "configure"
#include "confdefs.h"
#include <$ac_hdr>
EOF
eval "$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
ac_err=`grep -v '^ *+' conftest.out`
if test -z "$ac_err"; then
  rm -rf conftest*
  eval "ac_cv_header_$ac_safe=yes"
else
  echo "$ac_err" >&5
  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 | tr 'abcdefghijklmnopqrstuvwxyz./\055' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ___'`
  cat >> confdefs.h <<EOF
#define $ac_tr_hdr 1
EOF
 
else
  echo "$ac_t""no" 1>&6
fi
done

ac_found=no
else
echo $ac_n "checking whether string.h declares mem functions""... $ac_c" 1>&6
cat > conftest.$ac_ext <<EOF
#line 1019 "configure"
#include "confdefs.h"
#include <string.h>
EOF
if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
  egrep "memset" >/dev/null 2>&1; then
  rm -rf conftest*
  ac_found=yes
else
  rm -rf conftest*
  ac_found=no
fi
rm -f conftest*

echo "$ac_t""$ac_found" 1>&6
fi
# ac_found is now "yes" if string.h exists and declares the mem*
# functions.  If not, see if memory.h exists and include that
# as well.
if test $ac_found = no; then
ac_safe=`echo "memory" | tr './\055' '___'`
echo $ac_n "checking for memory""... $ac_c" 1>&6
if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  cat > conftest.$ac_ext <<EOF
#line 1045 "configure"
#include "confdefs.h"
#include <memory>
EOF
eval "$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
ac_err=`grep -v '^ *+' conftest.out`
if test -z "$ac_err"; then
  rm -rf conftest*
  eval "ac_cv_header_$ac_safe=yes"
else
  echo "$ac_err" >&5
  rm -rf conftest*
  eval "ac_cv_header_$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
  h. cat >> confdefs.h <<\EOF
#define NEED_MEMORY_H 1
EOF

else
  echo "$ac_t""no" 1>&6
fi

fi

echo $ac_n "checking whether <stdio.h> provides prototypes""... $ac_c" 1>&6
if eval "test \"`echo '$''{'bn_cv_header_stdio_protos'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  cat > conftest.$ac_ext <<EOF
#line 1078 "configure"
#include "confdefs.h"
#include <stdio.h>
EOF
if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
  egrep "printf" >/dev/null 2>&1; then
  rm -rf conftest*
  bn_cv_header_stdio_protos=yes
else
  rm -rf conftest*
  bn_cv_header_stdio_protos=no
fi
rm -f conftest*


fi

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

fi

fi
# ^^ End of non-ANSI header brokenness tests (first part)

echo $ac_n "checking whether <string.h> declares mem* wrong.""... $ac_c" 1>&6
if eval "test \"`echo '$''{'bn_cv_header_mem_broken'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  cat > conftest.$ac_ext <<EOF
#line 1111 "configure"
#include "confdefs.h"
#include <string.h>
EOF
if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
  egrep "memcpy.*char" >/dev/null 2>&1; then
  rm -rf conftest*
  bn_cv_header_mem_broken=yes
else
  rm -rf conftest*
  bn_cv_header_mem_broken=no
fi
rm -f conftest*


fi

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

fi

# SunOS 4.1.x acc's <assert.h> is broken
echo $ac_n "checking whether <assert.h> is broken and needs <stdio.h>""... $ac_c" 1>&6
if eval "test \"`echo '$''{'bn_cv_header_assert_needs_stdio'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  cat > conftest.$ac_ext <<EOF
#line 1142 "configure"
#include "confdefs.h"
#include <assert.h>
assert(foo)

EOF
if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
  egrep "stderr" >/dev/null 2>&1; then
  rm -rf conftest*
  bn_cv_header_assert_needs_stdio=yes
else
  rm -rf conftest*
  bn_cv_header_assert_needs_stdio=no
fi
rm -f conftest*


fi

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

fi

echo $ac_n "checking whether <assert.h> is broken and needs <stdlib.h>""... $ac_c" 1>&6
if eval "test \"`echo '$''{'bn_cv_header_assert_needs_stdlib'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  cat > conftest.$ac_ext <<EOF
#line 1174 "configure"
#include "confdefs.h"
#include <assert.h>
assert(foo)

EOF
if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
  egrep "exit" >/dev/null 2>&1; then
  rm -rf conftest*
  bn_cv_header_assert_needs_stdlib=yes
else
  rm -rf conftest*
  bn_cv_header_assert_needs_stdlib=no
fi
rm -f conftest*


fi

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

fi

# Check that we have <sys/time.h> explicitly.
for ac_hdr in sys/time.h
do
ac_safe=`echo "$ac_hdr" | tr './\055' '___'`
echo $ac_n "checking for $ac_hdr""... $ac_c" 1>&6
if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  cat > conftest.$ac_ext <<EOF
#line 1210 "configure"
#include "confdefs.h"
#include <$ac_hdr>
EOF
eval "$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
ac_err=`grep -v '^ *+' conftest.out`
if test -z "$ac_err"; then
  rm -rf conftest*
  eval "ac_cv_header_$ac_safe=yes"
else
  echo "$ac_err" >&5
  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 | tr 'abcdefghijklmnopqrstuvwxyz./\055' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ___'`
  cat >> confdefs.h <<EOF
#define $ac_tr_hdr 1
EOF
 
else
  echo "$ac_t""no" 1>&6
fi
done

echo $ac_n "checking whether time.h and sys/time.h may both be included""... $ac_c" 1>&6
if eval "test \"`echo '$''{'ac_cv_header_time'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  cat > conftest.$ac_ext <<EOF
#line 1243 "configure"
#include "confdefs.h"
#include <sys/types.h>
#include <sys/time.h>
#include <time.h>
int main() { return 0; }
int t() {
struct tm *tp;
; return 0; }
EOF
if eval $ac_compile; then
  rm -rf conftest*
  ac_cv_header_time=yes
else
  rm -rf conftest*
  ac_cv_header_time=no
fi
rm -f conftest*

fi

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

fi


# Verify that the compiler supports const, and that it works.
# A number of compilers sort of support const, but they have bugs
# that will prevent valid programs from compiling.
echo $ac_n "checking for working const""... $ac_c" 1>&6
if eval "test \"`echo '$''{'ac_cv_c_const'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  cat > conftest.$ac_ext <<EOF
#line 1281 "configure"
#include "confdefs.h"

int main() { return 0; }
int t() {

/* 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 $ac_compile; then
  rm -rf conftest*
  ac_cv_c_const=yes
else
  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