#!/bin/sh

# configure script for zlib.

#

# Normally configure builds both a static and a shared library.

# If you want to build just a static library, use: ./configure --static

#

# To impose specific compiler or flags or install directory, use for example:

#    prefix=$HOME CC=cc CFLAGS="-O4" ./configure

# or for csh/tcsh users:

#    (setenv prefix $HOME; setenv CC cc; setenv CFLAGS "-O4"; ./configure)

# Incorrect settings of CC or CFLAGS may prevent creating a shared library.

# If you have problems, try without defining CC and CFLAGS before reporting

# an error.

# start off configure.log

echo -------------------- >> configure.log

echo $0 $* >> configure.log

date >> configure.log

# set command prefix for cross-compilation

if [ -n "${CHOST}" ]; then

    uname="`echo "${CHOST}" | sed -e 's/^[^-]*-\([^-]*\)$/\1/' -e 's/^[^-]*-[^-]*-\([^-]*\)$/\1/' -e 's/^[^-]*-[^-]*-\([^-]*\)-.*$/\1/'`"

    CROSS_PREFIX="${CHOST}-"

fi

# destination name for static library

STATICLIB=libz.a

# extract zlib version numbers from zlib.h

VER=`sed -n -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`

VER3=`sed -n -e '/VERSION "/s/.*"\([0-9]*\\.[0-9]*\\.[0-9]*\).*/\1/p' < zlib.h`

VER2=`sed -n -e '/VERSION "/s/.*"\([0-9]*\\.[0-9]*\)\\..*/\1/p' < zlib.h`

VER1=`sed -n -e '/VERSION "/s/.*"\([0-9]*\)\\..*/\1/p' < zlib.h`

# establish commands for library building

if "${CROSS_PREFIX}ar" --version >/dev/null 2>/dev/null || test $? -lt 126; then

    AR=${AR-"${CROSS_PREFIX}ar"}

    test -n "${CROSS_PREFIX}" && echo Using ${AR} | tee -a configure.log

else

    AR=${AR-"ar"}

    test -n "${CROSS_PREFIX}" && echo Using ${AR} | tee -a configure.log

fi

ARFLAGS=${ARFLAGS-"rc"}

if "${CROSS_PREFIX}ranlib" --version >/dev/null 2>/dev/null || test $? -lt 126; then

    RANLIB=${RANLIB-"${CROSS_PREFIX}ranlib"}

    test -n "${CROSS_PREFIX}" && echo Using ${RANLIB} | tee -a configure.log

else

    RANLIB=${RANLIB-"ranlib"}

fi

if "${CROSS_PREFIX}nm" --version >/dev/null 2>/dev/null || test $? -lt 126; then

    NM=${NM-"${CROSS_PREFIX}nm"}

    test -n "${CROSS_PREFIX}" && echo Using ${NM} | tee -a configure.log

else

    NM=${NM-"nm"}

fi

# set defaults before processing command line options

LDCONFIG=${LDCONFIG-"ldconfig"}

LDSHAREDLIBC="${LDSHAREDLIBC--lc}"

ARCHS=

prefix=${prefix-/usr/local}

exec_prefix=${exec_prefix-'${prefix}'}

libdir=${libdir-'${exec_prefix}/lib'}

sharedlibdir=${sharedlibdir-'${libdir}'}

includedir=${includedir-'${prefix}/include'}

mandir=${mandir-'${prefix}/share/man'}

shared_ext='.so'

shared=1

solo=0

cover=0

zprefix=0

build64=0

gcc=0

old_cc="$CC"

old_cflags="$CFLAGS"

OBJC='$(OBJZ) $(OBJG)'

PIC_OBJC='$(PIC_OBJZ) $(PIC_OBJG)'

# process command line options

while test $# -ge 1

do

case "$1" in

    -h* | --help)

      echo 'usage:' | tee -a configure.log

      echo '  configure [--zprefix] [--prefix=PREFIX]  [--eprefix=EXPREFIX]' | tee -a configure.log

      echo '    [--static] [--64] [--libdir=LIBDIR] [--sharedlibdir=LIBDIR]' | tee -a configure.log

      echo '    [--includedir=INCLUDEDIR] [--archs="-arch i386 -arch x86_64"]' | tee -a configure.log

        exit 0 ;;

    -p*=* | --prefix=*) prefix=`echo $1 | sed 's/.*=//'`; shift ;;

    -e*=* | --eprefix=*) exec_prefix=`echo $1 | sed 's/.*=//'`; shift ;;

    -l*=* | --libdir=*) libdir=`echo $1 | sed 's/.*=//'`; shift ;;

    --sharedlibdir=*) sharedlibdir=`echo $1 | sed 's/.*=//'`; shift ;;

    -i*=* | --includedir=*) includedir=`echo $1 | sed 's/.*=//'`;shift ;;

    -u*=* | --uname=*) uname=`echo $1 | sed 's/.*=//'`;shift ;;

    -p* | --prefix) prefix="$2"; shift; shift ;;

    -e* | --eprefix) exec_prefix="$2"; shift; shift ;;

    -l* | --libdir) libdir="$2"; shift; shift ;;

    -i* | --includedir) includedir="$2"; shift; shift ;;

    -s* | --shared | --enable-shared) shared=1; shift ;;

    -t | --static) shared=0; shift ;;

    --solo) solo=1; shift ;;

    --cover) cover=1; shift ;;

    -z* | --zprefix) zprefix=1; shift ;;

    -6* | --64) build64=1; shift ;;

    -a*=* | --archs=*) ARCHS=`echo $1 | sed 's/.*=//'`; shift ;;

    --sysconfdir=*) echo "ignored option: --sysconfdir" | tee -a configure.log; shift ;;

    --localstatedir=*) echo "ignored option: --localstatedir" | tee -a configure.log; shift ;;

    *) echo "unknown option: $1"; echo "$0 --help for help" | tee -a configure.log; exit 1 ;;

    esac

done

# define functions for testing compiler and library characteristics and logging the results

test=ztest$$

show()

{

  case "$*" in

    *$test.c*)

      echo === $test.c === >> configure.log

      cat $test.c >> configure.log

      echo === >> configure.log;;

  esac

  echo $* >> configure.log

}

cat > $test.c <

#error error

EOF

if ($CC -c $CFLAGS $test.c) 2>/dev/null; then

  try()

  {

    show $*

    test "`( $* ) 2>&1 | tee -a configure.log`" = ""

  }

  echo - using any output from compiler to indicate an error >> configure.log

else

  try()

  {

    show $*

    ( $* ) >> configure.log 2>&1

    ret=$?

    if test $ret -ne 0; then

      echo "(exit code "$ret")" >> configure.log

    fi

    return $ret

  }

fi

tryboth()

{

  show $*

  got=`( $* ) 2>&1`

  ret=$?

  printf %s "$got" >> configure.log

  if test $ret -ne 0; then

    return $ret

  fi

  test "$got" = ""

}

echo >> configure.log

# check for gcc vs. cc and set compile and link flags based on the system identified by uname

cat > $test.c <

extern int getchar();

int hello() {return getchar();}

EOF

test -z "$CC" && echo Checking for ${CROSS_PREFIX}gcc... | tee -a configure.log

cc=${CC-${CROSS_PREFIX}gcc}

cflags=${CFLAGS-"-O3"}

# to force the asm version use: CFLAGS="-O3 -DASMV" ./configure

case "$cc" in

  *gcc*) gcc=1 ;;

  *clang*) gcc=1 ;;

esac

case `$cc -v 2>&1` in

  *gcc*) gcc=1 ;;

esac

show $cc -c $cflags $test.c

if test "$gcc" -eq 1 && ($cc -c $cflags $test.c) >> configure.log 2>&1; then

  echo ... using gcc >> configure.log

  CC="$cc"

  CFLAGS="${CFLAGS--O3} ${ARCHS}"

  SFLAGS="${CFLAGS--O3} -fPIC"

  LDFLAGS="${LDFLAGS} ${ARCHS}"

  if test $build64 -eq 1; then

    CFLAGS="${CFLAGS} -m64"

    SFLAGS="${SFLAGS} -m64"

  fi

  if test "${ZLIBGCCWARN}" = "YES"; then

    CFLAGS="${CFLAGS} -Wall -Wextra -pedantic"

  fi

  if test -z "$uname"; then

    uname=`(uname -s || echo unknown) 2>/dev/null`

  fi

  case "$uname" in

  Linux* | linux* | GNU | GNU/* | solaris*)

        LDSHARED=${LDSHARED-"$cc -shared -Wl,-soname,libz.so.1,--version-script,zlib.map"} ;;

  *BSD | *bsd* | DragonFly)

        LDSHARED=${LDSHARED-"$cc -shared -Wl,-soname,libz.so.1,--version-script,zlib.map"}

        LDCONFIG="ldconfig -m" ;;

  CYGWIN* | Cygwin* | cygwin* | OS/2*)

        EXE='.exe' ;;

  MINGW* | mingw*)

# temporary bypass

        rm -f $test.[co] $test $test$shared_ext

        echo "Please use win32/Makefile.gcc instead." | tee -a configure.log

        exit 1

        LDSHARED=${LDSHARED-"$cc -shared"}

        LDSHAREDLIBC=""

        EXE='.exe' ;;

  QNX*)  # This is for QNX6. I suppose that the QNX rule below is for QNX2,QNX4

         # (alain.bonnefoy@icbt.com)

                 LDSHARED=${LDSHARED-"$cc -shared -Wl,-hlibz.so.1"} ;;

  HP-UX*)

         LDSHARED=${LDSHARED-"$cc -shared $SFLAGS"}

         case `(uname -m || echo unknown) 2>/dev/null` in

         ia64)

                 shared_ext='.so'

                 SHAREDLIB='libz.so' ;;

         *)

                 shared_ext='.sl'

                 SHAREDLIB='libz.sl' ;;

         esac ;;

  Darwin* | darwin*)

             shared_ext='.dylib'

             SHAREDLIB=libz$shared_ext

             SHAREDLIBV=libz.$VER$shared_ext

             SHAREDLIBM=libz.$VER1$shared_ext

             LDSHARED=${LDSHARED-"$cc -dynamiclib -install_name $libdir/$SHAREDLIBM -compatibility_version $VER1 -current_version $VER3"}

             AR="/usr/bin/libtool"

             ARFLAGS="-o" ;;

  *)             LDSHARED=${LDSHARED-"$cc -shared"} ;;

  esac

else

  # find system name and corresponding cc options

  CC=${CC-cc}

  gcc=0

  echo ... using $CC >> configure.log

  if test -z "$uname"; then

    uname=`(uname -sr || echo unknown) 2>/dev/null`

  fi

  case "$uname" in

  HP-UX*)    SFLAGS=${CFLAGS-"-O +z"}

             CFLAGS=${CFLAGS-"-O"}

#            LDSHARED=${LDSHARED-"ld -b +vnocompatwarnings"}

             LDSHARED=${LDSHARED-"ld -b"}

         case `(uname -m || echo unknown) 2>/dev/null` in

         ia64)

             shared_ext='.so'

             SHAREDLIB='libz.so' ;;

         *)

             shared_ext='.sl'

             SHAREDLIB='libz.sl' ;;

         esac ;;

  IRIX*)     SFLAGS=${CFLAGS-"-ansi -O2 -rpath ."}

             CFLAGS=${CFLAGS-"-ansi -O2"}

             LDSHARED=${LDSHARED-"cc -shared -Wl,-soname,libz.so.1"} ;;

  OSF1\ V4*) SFLAGS=${CFLAGS-"-O -std1"}

             CFLAGS=${CFLAGS-"-O -std1"}

             LDFLAGS="${LDFLAGS} -Wl,-rpath,."

             LDSHARED=${LDSHARED-"cc -shared  -Wl,-soname,libz.so -Wl,-msym -Wl,-rpath,$(libdir) -Wl,-set_version,${VER}:1.0"} ;;

  OSF1*)     SFLAGS=${CFLAGS-"-O -std1"}

             CFLAGS=${CFLAGS-"-O -std1"}

             LDSHARED=${LDSHARED-"cc -shared -Wl,-soname,libz.so.1"} ;;

  QNX*)      SFLAGS=${CFLAGS-"-4 -O"}

             CFLAGS=${CFLAGS-"-4 -O"}

             LDSHARED=${LDSHARED-"cc"}

             RANLIB=${RANLIB-"true"}

             AR="cc"

             ARFLAGS="-A" ;;

  SCO_SV\ 3.2*) SFLAGS=${CFLAGS-"-O3 -dy -KPIC "}

             CFLAGS=${CFLAGS-"-O3"}

             LDSHARED=${LDSHARED-"cc -dy -KPIC -G"} ;;

  SunOS\ 5* | solaris*)

         LDSHARED=${LDSHARED-"cc -G -h libz$shared_ext.$VER1"}

         SFLAGS=${CFLAGS-"-fast -KPIC"}

         CFLAGS=${CFLAGS-"-fast"}

         if test $build64 -eq 1; then

             # old versions of SunPRO/Workshop/Studio don't support -m64,

             # but newer ones do.  Check for it.

             flag64=`$CC -flags | egrep -- '^-m64'`

             if test x"$flag64" != x"" ; then

                 CFLAGS="${CFLAGS} -m64"

                 SFLAGS="${SFLAGS} -m64"

             else

                 case `(uname -m || echo unknown) 2>/dev/null` in

                   i86*)

                     SFLAGS="$SFLAGS -xarch=amd64"

                     CFLAGS="$CFLAGS -xarch=amd64" ;;

                   *)

                     SFLAGS="$SFLAGS -xarch=v9"

                     CFLAGS="$CFLAGS -xarch=v9" ;;

                 esac

             fi

         fi

         ;;

  SunOS\ 4*) SFLAGS=${CFLAGS-"-O2 -PIC"}

             CFLAGS=${CFLAGS-"-O2"}

             LDSHARED=${LDSHARED-"ld"} ;;

  SunStudio\ 9*) SFLAGS=${CFLAGS-"-fast -xcode=pic32 -xtarget=ultra3 -xarch=v9b"}

             CFLAGS=${CFLAGS-"-fast -xtarget=ultra3 -xarch=v9b"}

             LDSHARED=${LDSHARED-"cc -xarch=v9b"} ;;

  UNIX_System_V\ 4.2.0)

             SFLAGS=${CFLAGS-"-KPIC -O"}

             CFLAGS=${CFLAGS-"-O"}

             LDSHARED=${LDSHARED-"cc -G"} ;;

  UNIX_SV\ 4.2MP)

             SFLAGS=${CFLAGS-"-Kconform_pic -O"}

             CFLAGS=${CFLAGS-"-O"}

             LDSHARED=${LDSHARED-"cc -G"} ;;

  OpenUNIX\ 5)

             SFLAGS=${CFLAGS-"-KPIC -O"}

             CFLAGS=${CFLAGS-"-O"}

             LDSHARED=${LDSHARED-"cc -G"} ;;

  AIX*)  # Courtesy of dbakker@arrayasolutions.com

             SFLAGS=${CFLAGS-"-O -qmaxmem=8192"}

             CFLAGS=${CFLAGS-"-O -qmaxmem=8192"}

             LDSHARED=${LDSHARED-"xlc -G"} ;;

  # send working options for other systems to zlib@gzip.org

  *)         SFLAGS=${CFLAGS-"-O"}

             CFLAGS=${CFLAGS-"-O"}

             LDSHARED=${LDSHARED-"cc -shared"} ;;

  esac

fi

# destination names for shared library if not defined above

SHAREDLIB=${SHAREDLIB-"libz$shared_ext"}

SHAREDLIBV=${SHAREDLIBV-"libz$shared_ext.$VER"}

SHAREDLIBM=${SHAREDLIBM-"libz$shared_ext.$VER1"}

echo >> configure.log

# see if shared library build supported

if test $shared -eq 1; then

  echo Checking for shared library support... | tee -a configure.log

  # we must test in two steps (cc then ld), required at least on SunOS 4.x

  if try $CC -w -c $SFLAGS $test.c &&

     try $LDSHARED $SFLAGS -o $test$shared_ext $test.o; then

    echo Building shared library $SHAREDLIBV with $CC. | tee -a configure.log

  elif test -z "$old_cc" -a -z "$old_cflags"; then

    echo No shared library support. | tee -a configure.log

    shared=0;

  else

    echo 'No shared library support; try without defining CC and CFLAGS' | tee -a configure.log

    shared=0;

  fi

fi

if test $shared -eq 0; then

  LDSHARED="$CC"

  ALL="static"

  TEST="all teststatic"

  SHAREDLIB=""

  SHAREDLIBV=""

  SHAREDLIBM=""

  echo Building static library $STATICLIB version $VER with $CC. | tee -a configure.log

else

  ALL="static shared"

  TEST="all teststatic testshared"

fi

echo >> configure.log

# check for underscores in external names for use by assembler code

CPP=${CPP-"$CC -E"}

case $CFLAGS in

  *ASMV*)

    echo >> configure.log

    show "$NM $test.o | grep _hello"

    if test "`$NM $test.o | grep _hello | tee -a configure.log`" = ""; then

      CPP="$CPP -DNO_UNDERLINE"

      echo Checking for underline in external names... No. | tee -a configure.log

    else

      echo Checking for underline in external names... Yes. | tee -a configure.log

    fi ;;

esac

echo >> configure.log

# check for large file support, and if none, check for fseeko()

cat > $test.c <

#include <sys types.h=""></sys>

off64_t dummy = 0;

EOF

if try $CC -c $CFLAGS -D_LARGEFILE64_SOURCE=1 $test.c; then

  CFLAGS="${CFLAGS} -D_LARGEFILE64_SOURCE=1"

  SFLAGS="${SFLAGS} -D_LARGEFILE64_SOURCE=1"

  ALL="${ALL} all64"

  TEST="${TEST} test64"

  echo "Checking for off64_t... Yes." | tee -a configure.log

  echo "Checking for fseeko... Yes." | tee -a configure.log

else

  echo "Checking for off64_t... No." | tee -a configure.log

  echo >> configure.log

  cat > $test.c <

#include <stdio.h></stdio.h>

int main(void) {

  fseeko(NULL, 0, 0);

  return 0;

}

EOF

  if try $CC $CFLAGS -o $test $test.c; then

    echo "Checking for fseeko... Yes." | tee -a configure.log

  else

    CFLAGS="${CFLAGS} -DNO_FSEEKO"

    SFLAGS="${SFLAGS} -DNO_FSEEKO"

    echo "Checking for fseeko... No." | tee -a configure.log

  fi

fi

echo >> configure.log

# check for strerror() for use by gz* functions

cat > $test.c <

#include <string.h></string.h>

#include <errno.h></errno.h>

int main() { return strlen(strerror(errno)); }

EOF

if try $CC $CFLAGS -o $test $test.c; then

  echo "Checking for strerror... Yes." | tee -a configure.log

else

  CFLAGS="${CFLAGS} -DNO_STRERROR"

  SFLAGS="${SFLAGS} -DNO_STRERROR"

  echo "Checking for strerror... No." | tee -a configure.log

fi

# copy clean zconf.h for subsequent edits

cp -p zconf.h.in zconf.h

echo >> configure.log

# check for unistd.h and save result in zconf.h

cat > $test.c <

#include <unistd.h></unistd.h>

int main() { return 0; }

EOF

if try $CC -c $CFLAGS $test.c; then

  sed < zconf.h "/^#ifdef HAVE_UNISTD_H.* may be/s/def HAVE_UNISTD_H\(.*\) may be/ 1\1 was/" > zconf.temp.h

  mv zconf.temp.h zconf.h

  echo "Checking for unistd.h... Yes." | tee -a configure.log

else

  echo "Checking for unistd.h... No." | tee -a configure.log

fi

echo >> configure.log

# check for stdarg.h and save result in zconf.h

cat > $test.c <

#include <stdarg.h></stdarg.h>

int main() { return 0; }

EOF

if try $CC -c $CFLAGS $test.c; then

  sed < zconf.h "/^#ifdef HAVE_STDARG_H.* may be/s/def HAVE_STDARG_H\(.*\) may be/ 1\1 was/" > zconf.temp.h

  mv zconf.temp.h zconf.h

  echo "Checking for stdarg.h... Yes." | tee -a configure.log

else

  echo "Checking for stdarg.h... No." | tee -a configure.log

fi

# if the z_ prefix was requested, save that in zconf.h

if test $zprefix -eq 1; then

  sed < zconf.h "/#ifdef Z_PREFIX.* may be/s/def Z_PREFIX\(.*\) may be/ 1\1 was/" > zconf.temp.h

  mv zconf.temp.h zconf.h

  echo >> configure.log

  echo "Using z_ prefix on all symbols." | tee -a configure.log

fi

# if --solo compilation was requested, save that in zconf.h and remove gz stuff from object lists

if test $solo -eq 1; then

  sed '/#define ZCONF_H/a\

#define Z_SOLO

' < zconf.h > zconf.temp.h

  mv zconf.temp.h zconf.h

OBJC='$(OBJZ)'

PIC_OBJC='$(PIC_OBJZ)'

fi

# if code coverage testing was requested, use older gcc if defined, e.g. "gcc-4.2" on Mac OS X

if test $cover -eq 1; then

  CFLAGS="${CFLAGS} -fprofile-arcs -ftest-coverage"

  if test -n "$GCC_CLASSIC"; then

    CC=$GCC_CLASSIC

  fi

fi

echo >> configure.log

# conduct a series of tests to resolve eight possible cases of using "vs" or "s" printf functions

# (using stdarg or not), with or without "n" (proving size of buffer), and with or without a

# return value.  The most secure result is vsnprintf() with a return value.  snprintf() with a

# return value is secure as well, but then gzprintf() will be limited to 20 arguments.

cat > $test.c <

#include <stdio.h></stdio.h>

#include <stdarg.h></stdarg.h>

#include "zconf.h"

int main()

{

#ifndef STDC

  choke me

#endif

  return 0;

}

EOF

if try $CC -c $CFLAGS $test.c; then

  echo "Checking whether to use vs[n]printf() or s[n]printf()... using vs[n]printf()." | tee -a configure.log

  echo >> configure.log

  cat > $test.c <

#include <stdio.h></stdio.h>

#include <stdarg.h></stdarg.h>

int mytest(const char *fmt, ...)

{

  char buf[20];

  va_list ap;

  va_start(ap, fmt);

  vsnprintf(buf, sizeof(buf), fmt, ap);

  va_end(ap);

  return 0;

}

int main()

{

  return (mytest("Hello%d\n", 1));

}

EOF

  if try $CC $CFLAGS -o $test $test.c; then

    echo "Checking for vsnprintf() in stdio.h... Yes." | tee -a configure.log

    echo >> configure.log

    cat >$test.c <

#include <stdio.h></stdio.h>

#include <stdarg.h></stdarg.h>

int mytest(const char *fmt, ...)

{

  int n;

  char buf[20];

  va_list ap;

  va_start(ap, fmt);

  n = vsnprintf(buf, sizeof(buf), fmt, ap);

  va_end(ap);

  return n;

}

int main()

{

  return (mytest("Hello%d\n", 1));

}

EOF

    if try $CC -c $CFLAGS $test.c; then

      echo "Checking for return value of vsnprintf()... Yes." | tee -a configure.log

    else

      CFLAGS="$CFLAGS -DHAS_vsnprintf_void"

      SFLAGS="$SFLAGS -DHAS_vsnprintf_void"

      echo "Checking for return value of vsnprintf()... No." | tee -a configure.log

      echo "  WARNING: apparently vsnprintf() does not return a value. zlib" | tee -a configure.log

      echo "  can build but will be open to possible string-format security" | tee -a configure.log

      echo "  vulnerabilities." | tee -a configure.log

    fi

  else

    CFLAGS="$CFLAGS -DNO_vsnprintf"

    SFLAGS="$SFLAGS -DNO_vsnprintf"

    echo "Checking for vsnprintf() in stdio.h... No." | tee -a configure.log

    echo "  WARNING: vsnprintf() not found, falling back to vsprintf(). zlib" | tee -a configure.log

    echo "  can build but will be open to possible buffer-overflow security" | tee -a configure.log

    echo "  vulnerabilities." | tee -a configure.log

    echo >> configure.log

    cat >$test.c <

#include <stdio.h></stdio.h>

#include <stdarg.h></stdarg.h>

int mytest(const char *fmt, ...)

{

  int n;

  char buf[20];

  va_list ap;

  va_start(ap, fmt);

  n = vsprintf(buf, fmt, ap);

  va_end(ap);

  return n;

}

int main()

{

  return (mytest("Hello%d\n", 1));

}

EOF

    if try $CC -c $CFLAGS $test.c; then

      echo "Checking for return value of vsprintf()... Yes." | tee -a configure.log

    else

      CFLAGS="$CFLAGS -DHAS_vsprintf_void"

      SFLAGS="$SFLAGS -DHAS_vsprintf_void"

      echo "Checking for return value of vsprintf()... No." | tee -a configure.log

      echo "  WARNING: apparently vsprintf() does not return a value. zlib" | tee -a configure.log

      echo "  can build but will be open to possible string-format security" | tee -a configure.log

      echo "  vulnerabilities." | tee -a configure.log

    fi

  fi

else

  echo "Checking whether to use vs[n]printf() or s[n]printf()... using s[n]printf()." | tee -a configure.log

  echo >> configure.log

  cat >$test.c <

#include <stdio.h></stdio.h>

int mytest()

{

  char buf[20];

  snprintf(buf, sizeof(buf), "%s", "foo");

  return 0;

}

int main()

{

  return (mytest());

}

EOF

  if try $CC $CFLAGS -o $test $test.c; then

    echo "Checking for snprintf() in stdio.h... Yes." | tee -a configure.log

    echo >> configure.log

    cat >$test.c <

#include <stdio.h></stdio.h>

int mytest()

{

  char buf[20];

  return snprintf(buf, sizeof(buf), "%s", "foo");

}

int main()

{

  return (mytest());

}

EOF

    if try $CC -c $CFLAGS $test.c; then

      echo "Checking for return value of snprintf()... Yes." | tee -a configure.log

    else

      CFLAGS="$CFLAGS -DHAS_snprintf_void"

      SFLAGS="$SFLAGS -DHAS_snprintf_void"

      echo "Checking for return value of snprintf()... No." | tee -a configure.log

      echo "  WARNING: apparently snprintf() does not return a value. zlib" | tee -a configure.log

      echo "  can build but will be open to possible string-format security" | tee -a configure.log

      echo "  vulnerabilities." | tee -a configure.log

    fi

  else

    CFLAGS="$CFLAGS -DNO_snprintf"

    SFLAGS="$SFLAGS -DNO_snprintf"

    echo "Checking for snprintf() in stdio.h... No." | tee -a configure.log

    echo "  WARNING: snprintf() not found, falling back to sprintf(). zlib" | tee -a configure.log

    echo "  can build but will be open to possible buffer-overflow security" | tee -a configure.log

    echo "  vulnerabilities." | tee -a configure.log

    echo >> configure.log

    cat >$test.c <

#include <stdio.h></stdio.h>

int mytest()

{

  char buf[20];

  return sprintf(buf, "%s", "foo");

}

int main()

{

  return (mytest());

}

EOF

    if try $CC -c $CFLAGS $test.c; then

      echo "Checking for return value of sprintf()... Yes." | tee -a configure.log

    else

      CFLAGS="$CFLAGS -DHAS_sprintf_void"

      SFLAGS="$SFLAGS -DHAS_sprintf_void"

      echo "Checking for return value of sprintf()... No." | tee -a configure.log

      echo "  WARNING: apparently sprintf() does not return a value. zlib" | tee -a configure.log

      echo "  can build but will be open to possible string-format security" | tee -a configure.log

      echo "  vulnerabilities." | tee -a configure.log

    fi

  fi

fi

# see if we can hide zlib internal symbols that are linked between separate source files

if test "$gcc" -eq 1; then

  echo >> configure.log

  cat > $test.c <

#define ZLIB_INTERNAL __attribute__((visibility ("hidden")))

int ZLIB_INTERNAL foo;

int main()

{

  return 0;

}

EOF

  if tryboth $CC -c $CFLAGS $test.c; then

    CFLAGS="$CFLAGS -DHAVE_HIDDEN"

    SFLAGS="$SFLAGS -DHAVE_HIDDEN"

    echo "Checking for attribute(visibility) support... Yes." | tee -a configure.log

  else

    echo "Checking for attribute(visibility) support... No." | tee -a configure.log

  fi

fi

echo >> configure.log

# find a four-byte unsiged integer type for crc calculations

cat > $test.c <

#include <stdio.h></stdio.h>

#define is32(n,t) for(n=1,k=0;n;n<<=1,k++);if(k==32){puts(t);return 0;}

int main() {

    int k;

    unsigned i;

    unsigned long l;

    unsigned short s;

    is32(i, "unsigned")

    is32(l, "unsigned long")

    is32(s, "unsigned short")

    return 1;

}

EOF

Z_U4=""

if try $CC $CFLAGS $test.c -o $test && Z_U4=`./$test` && test -n "$Z_U4"; then

  sed < zconf.h "/#define Z_U4/s/\/\* \.\/configure may/#define Z_U4 $Z_U4   \/* .\/configure put the/" > zconf.temp.h

  mv zconf.temp.h zconf.h

  echo "Looking for a four-byte integer type... Found." | tee -a configure.log

else

  echo "Looking for a four-byte integer type... Not found." | tee -a configure.log

fi

# clean up files produced by running the compiler and linker

rm -f $test.[co] $test $test$shared_ext $test.gcno

# show the results in the log

echo >> configure.log

echo ALL = $ALL >> configure.log

echo AR = $AR >> configure.log

echo ARFLAGS = $ARFLAGS >> configure.log

echo CC = $CC >> configure.log

echo CFLAGS = $CFLAGS >> configure.log

echo CPP = $CPP >> configure.log

echo EXE = $EXE >> configure.log

echo LDCONFIG = $LDCONFIG >> configure.log

echo LDFLAGS = $LDFLAGS >> configure.log

echo LDSHARED = $LDSHARED >> configure.log

echo LDSHAREDLIBC = $LDSHAREDLIBC >> configure.log

echo OBJC = $OBJC >> configure.log

echo PIC_OBJC = $PIC_OBJC >> configure.log

echo RANLIB = $RANLIB >> configure.log

echo SFLAGS = $SFLAGS >> configure.log

echo SHAREDLIB = $SHAREDLIB >> configure.log

echo SHAREDLIBM = $SHAREDLIBM >> configure.log

echo SHAREDLIBV = $SHAREDLIBV >> configure.log

echo STATICLIB = $STATICLIB >> configure.log

echo TEST = $TEST >> configure.log

echo VER = $VER >> configure.log

echo Z_U4 = $Z_U4 >> configure.log

echo exec_prefix = $exec_prefix >> configure.log

echo includedir = $includedir >> configure.log

echo libdir = $libdir >> configure.log

echo mandir = $mandir >> configure.log

echo prefix = $prefix >> configure.log

echo sharedlibdir = $sharedlibdir >> configure.log

echo uname = $uname >> configure.log

echo -------------------- >> configure.log

echo >> configure.log

echo >> configure.log

# udpate Makefile with the configure results

sed < Makefile.in "

/^CC *=/s#=.*#=$CC#

/^CFLAGS *=/s#=.*#=$CFLAGS#

/^SFLAGS *=/s#=.*#=$SFLAGS#

/^LDFLAGS *=/s#=.*#=$LDFLAGS#

/^LDSHARED *=/s#=.*#=$LDSHARED#

/^CPP *=/s#=.*#=$CPP#

/^STATICLIB *=/s#=.*#=$STATICLIB#

/^SHAREDLIB *=/s#=.*#=$SHAREDLIB#

/^SHAREDLIBV *=/s#=.*#=$SHAREDLIBV#

/^SHAREDLIBM *=/s#=.*#=$SHAREDLIBM#

/^AR *=/s#=.*#=$AR#

/^ARFLAGS *=/s#=.*#=$ARFLAGS#

/^RANLIB *=/s#=.*#=$RANLIB#

/^LDCONFIG *=/s#=.*#=$LDCONFIG#

/^LDSHAREDLIBC *=/s#=.*#=$LDSHAREDLIBC#

/^EXE *=/s#=.*#=$EXE#

/^prefix *=/s#=.*#=$prefix#

/^exec_prefix *=/s#=.*#=$exec_prefix#

/^libdir *=/s#=.*#=$libdir#

/^sharedlibdir *=/s#=.*#=$sharedlibdir#

/^includedir *=/s#=.*#=$includedir#

/^mandir *=/s#=.*#=$mandir#

/^OBJC *=/s#=.*#= $OBJC#

/^PIC_OBJC *=/s#=.*#= $PIC_OBJC#

/^all: */s#:.*#: $ALL#

/^test: */s#:.*#: $TEST#

" > Makefile

# create zlib.pc with the configure results

sed < zlib.pc.in "

/^CC *=/s#=.*#=$CC#

/^CFLAGS *=/s#=.*#=$CFLAGS#

/^CPP *=/s#=.*#=$CPP#

/^LDSHARED *=/s#=.*#=$LDSHARED#

/^STATICLIB *=/s#=.*#=$STATICLIB#

/^SHAREDLIB *=/s#=.*#=$SHAREDLIB#

/^SHAREDLIBV *=/s#=.*#=$SHAREDLIBV#

/^SHAREDLIBM *=/s#=.*#=$SHAREDLIBM#

/^AR *=/s#=.*#=$AR#

/^ARFLAGS *=/s#=.*#=$ARFLAGS#

/^RANLIB *=/s#=.*#=$RANLIB#

/^EXE *=/s#=.*#=$EXE#

/^prefix *=/s#=.*#=$prefix#

/^exec_prefix *=/s#=.*#=$exec_prefix#

/^libdir *=/s#=.*#=$libdir#

/^sharedlibdir *=/s#=.*#=$sharedlibdir#

/^includedir *=/s#=.*#=$includedir#

/^mandir *=/s#=.*#=$mandir#

/^LDFLAGS *=/s#=.*#=$LDFLAGS#

" | sed -e "

s/\@VERSION\@/$VER/g;

" > zlib.pc