#!/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

SRCDIR=$(cd $(dirname $0); pwd)
BUILDDIR=$(pwd)

# 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}-"
    ARCH="`echo "${CHOST}" | sed -e 's/-.*//'`"
else
    ARCH="`uname -m`"
fi

case "${ARCH}" in
    x86_64)
        case "${CFLAGS}" in
            *-m32*)
                ARCH=i686
            ;;
        esac
    ;;
    i386 | i486 | i586 | i686)
        case "${CFLAGS}" in
            *-m64*)
                ARCH=x86_64
            ;;
        esac
    ;;
esac

# destination name for static library
STATICLIB=libz.a

# destination name for windows import library
IMPORTLIB=

# extract zlib version numbers from zlib.h
VER=`sed -n -e '/ZLIB_VERSION "/s/.*"\(.*\)".*/\1/p' < ${SRCDIR}/zlib.h`
VER3=`sed -n -e '/ZLIB_VERSION "/s/.*"\([0-9]*\\.[0-9]*\\.[0-9]*\).*/\1/p' < ${SRCDIR}/zlib.h`
VER2=`sed -n -e '/ZLIB_VERSION "/s/.*"\([0-9]*\\.[0-9]*\)\\..*/\1/p' < ${SRCDIR}/zlib.h`
VER1=`sed -n -e '/ZLIB_VERSION "/s/.*"\([0-9]*\)\\..*/\1/p' < ${SRCDIR}/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}"
DEFFILE=
RC=
RCFLAGS=
RCOBJS=
STRIP=
ARCHS=
prefix=${prefix-/usr/local}
exec_prefix=${exec_prefix-'${prefix}'}
bindir=${bindir-'${exec_prefix}/bin'}
libdir=${libdir-'${exec_prefix}/lib'}
sharedlibdir=${sharedlibdir-'${libdir}'}
includedir=${includedir-'${prefix}/include'}
mandir=${mandir-'${prefix}/share/man'}
shared_ext='.so'
shared=1
gzfileops=0
compat=0
cover=0
build32=0
build64=0
without_optimizations=0
without_new_strategies=0
gcc=0
old_cc="$CC"
old_cflags="$CFLAGS"
OBJC='$(OBJZ)'
PIC_OBJC='$(PIC_OBJZ)'
INSTALLTARGETS="install-shared install-static"
UNINSTALLTARGETS="uninstall-shared uninstall-static"

TEST="teststatic"

# leave this script, optionally in a bad way
leave()
{
  if test "$*" != "0"; then
    echo "** $0 aborting." | tee -a configure.log
  fi
  rm -f $test.[co] $test $test$shared_ext $test.gcno ./--version
  echo -------------------- >> configure.log
  echo >> configure.log
  echo >> configure.log
  exit $1
}

# process command line options
while test $# -ge 1
do
case "$1" in
    -h* | --help)
      echo 'usage:' | tee -a configure.log
      echo '  configure [--zlib-compat] [--prefix=PREFIX]  [--eprefix=EXPREFIX]' | tee -a configure.log
      echo '    [--static] [--32] [--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 ;;
    --zlib-compat) compat=1; shift ;;
    --cover) cover=1; shift ;;
    -3* | --32) build32=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 ;;
    -noopt | --without-optimizations) without_optimizations=1; shift;;
    -oldstrat | --without-new-strategies) without_new_strategies=1; shift;;
    *)
      echo "unknown option: $1" | tee -a configure.log
      echo "$0 --help for help" | tee -a configure.log
      leave 1;;
    esac
done

# temporary file name
test=ztest$$

# put arguments in log, also put test file in log if used in arguments
show()
{
  case "$*" in
    *$test.c*)
      echo === $test.c === >> configure.log
      cat $test.c >> configure.log
      echo === >> configure.log;;
  esac
  echo $* >> configure.log
}

# check for gcc vs. cc and set compile and link flags based on the system identified by uname
cat > $test.c <<EOF
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"}
case "$cc" in
  *gcc*) gcc=1 ;;
  *clang*) gcc=1 ;;
esac
case `$cc -v 2>&1` in
  *gcc*) gcc=1 ;;
esac

show $cc -c $test.c
if test "$gcc" -eq 1 && ($cc -c $test.c) >> configure.log 2>&1; then
  echo ... using gcc >> configure.log
  CC="$cc"
# Re-check arch if gcc is a cross-compiler
  GCC_ARCH=`$CC -dumpmachine | sed 's/-.*//g'`
  case $GCC_ARCH in
    i386 | i486 | i586 | i686)
# Honor user choice if gcc is multilib and 64-bit is requested 
      if test $build64 -eq 1; then
        ARCH=x86_64
      else
        ARCH=$GCC_ARCH 
      fi ;;
# Honor user choice if gcc is multilib and 32-bit is requested
    x86_64)
      if test $build32 -ne 1; then
        ARCH=$GCC_ARCH
      fi ;;
  esac
  CFLAGS="${CFLAGS--O3} ${ARCHS} -Wall"
  SFLAGS="${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="${CFLAGS} -Wextra -pedantic"
  fi
  if test -z "$uname"; then
    uname=`(uname -s || echo unknown) 2>/dev/null`
  fi
  case "$uname" in
  Linux* | linux* | GNU | GNU/* | solaris*)
        LDSHARED=${LDSHARED-"$cc -shared -Wl,-soname,libz.so.1,--version-script,${SRCDIR}/zlib.map"} ;;
  *BSD | *bsd* | DragonFly)
        LDSHARED=${LDSHARED-"$cc -shared -Wl,-soname,libz.so.1,--version-script,${SRCDIR}/zlib.map"}
        LDCONFIG="ldconfig -m" ;;
  CYGWIN* | Cygwin* | cygwin*)
        ARFLAGS="rcs"
        CFLAGS="${CFLAGS} -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
        SFLAGS="${CFLAGS}"
        shared_ext='.dll'
        sharedlibdir='${bindir}'
        SHAREDLIB=cygz$shared_ext
        SHAREDLIBM=''
        SHAREDLIBV=''
        SHAREDTARGET=$SHAREDLIB
        IMPORTLIB='libz.dll.a'
        LDSHARED=${LDSHARED-"$cc -shared -Wl,--out-implib,${IMPORTLIB},--version-script,${SRCDIR}/zlib.map"}
        LDSHAREDLIBC=""
        DEFFILE='win32/zlib.def'
        RC='windres'
        RCFLAGS='--define GCC_WINDRES'
        RCOBJS='zlibrc.o'
        STRIP='strip'
        EXE='.exe' ;;
  MSYS* | msys*)
        ARFLAGS="rcs"
        SFLAGS="${CFLAGS}"
        shared_ext='.dll'
        sharedlibdir='${bindir}'
        SHAREDLIB=msys-z$shared_ext
        SHAREDLIBM=''
        SHAREDLIBV=''
        SHAREDTARGET=$SHAREDLIB
        IMPORTLIB='libz.dll.a'
        LDSHARED=${LDSHARED-"$cc -shared -Wl,--out-implib,${IMPORTLIB}"}
        LDSHAREDLIBC=""
        DEFFILE='win32/zlib.def'
        RC='windres'
        RCFLAGS='--define GCC_WINDRES'
        RCOBJS='zlibrc.o'
        STRIP='strip'
        EXE='.exe' ;;
  MINGW* | mingw*)
        ARFLAGS="rcs"
        CFLAGS="${CFLAGS} -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_POSIX_C_SOURCE=200809L -D_GNU_SOURCE=1"
        SFLAGS="${CFLAGS}"
        shared_ext='.dll'
        sharedlibdir='${bindir}'
        SHAREDLIB=libz-$VER1$shared_ext
        SHAREDLIBM=''
        SHAREDLIBV=''
        SHAREDTARGET=$SHAREDLIB
        IMPORTLIB='libz.dll.a'
        LDSHARED=${LDSHARED-"$cc -shared -Wl,--out-implib=${IMPORTLIB} -Wl,--version-script=${SRCDIR}/zlib.map"}
        LDSHAREDLIBC=""
        DEFFILE='win32/zlib.def'
        RC='windres'
        RCFLAGS='--define GCC_WINDRES'
        if [ "$CC" == "mingw32-gcc" ]; then
          case $ARCH in
          i386 | i486 | i586 | i686) RCFLAGS="${RCFLAGS} -F pe-i386";;
          esac;
        fi
        RCOBJS='zlibrc.o'
        STRIP='strip'
        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
             SHAREDTARGET=$SHAREDLIBV
             LDSHARED=${LDSHARED-"$cc -dynamiclib -install_name $libdir/$SHAREDLIBM -compatibility_version $VER1 -current_version $VER3"}
             if libtool -V 2>&1 | grep Apple > /dev/null; then
                 AR="libtool"
             else
                 AR="/usr/bin/libtool"
             fi
             ARFLAGS="-o" ;;
  *)             LDSHARED=${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=${LDSHARED-"ld -b"}
         case `(uname -m || echo unknown) 2>/dev/null` in
         ia64)
             shared_ext='.so'
             SHAREDLIB='libz.so' ;;
         *)
             shared_ext='.sl'
             SHAREDLIB='libz.sl' ;;
         esac ;;
  AIX*)  # Courtesy of dbakker@arrayasolutions.com
             SFLAGS=${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"}
SHAREDTARGET=${SHAREDTARGET-"libz$shared_ext.$VER"}

echo >> configure.log

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

cat > $test.c <<EOF
#error error
EOF
if ($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" = ""
}

cat > $test.c << EOF
int foo() { return 0; }
EOF
echo "Checking for obsessive-compulsive compiler options..." >> configure.log
if try $CC -c $CFLAGS $test.c; then
  :
else
  echo "Compiler error reporting is too harsh for $0 (perhaps remove -Werror)." | tee -a configure.log
  leave 1
fi

echo >> configure.log

# see if shared library build supported
cat > $test.c <<EOF
extern int getchar();
int hello() {return getchar();}
EOF
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 $SHAREDTARGET 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"
  SHAREDLIB=""
  SHAREDLIBV=""
  SHAREDLIBM=""
  SHAREDTARGET=""
  INSTALLTARGETS=install-static
  UNINSTALLTARGETS=uninstall-static
  echo Building static library $STATICLIB version $VER with $CC. | tee -a configure.log
else
  ALL="static shared"
  TEST="${TEST} testshared"
fi

echo >> configure.log

# check for large file support, and if none, check for fseeko()
cat > $test.c <<EOF
#include <sys/types.h>
#ifdef __MSYS__
#  define off64_t _off64_t
#endif
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 <<EOF
#include <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 <<EOF
#include <string.h>
#include <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

# We need to remove zconf.h from source directory if building outside of it
if [ "$SRCDIR" != "$BUILDDIR" ]; then rm -f $SRCDIR/zconf.h; fi

# copy clean zconf.h for subsequent edits
cp -p $SRCDIR/zconf.h.in zconf.h

echo >> configure.log

# check for unistd.h and save result in zconf.h
cat > $test.c <<EOF
#include <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 <<EOF
#include <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 --zlib-compat was requested
if test $compat -eq 1; then
  CFLAGS="${CFLAGS} -DZLIB_COMPAT -DWITH_GZFILEOP"
  SFLAGS="${SFLAGS} -DZLIB_COMPAT -DWITH_GZFILEOP"
  OBJC="${OBJC} \$(OBJG)"
  PIC_OBJC="${PIC_OBJC} \$(PIC_OBJG)"
  case "$uname" in
  CYGWIN* | Cygwin* | cygwin* | MSYS* | msys* | MINGW* | mingw*)
    DEFFILE="win32/zlibcompat.def" ;;
  esac
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

# Check for ANSI C compliant compiler
cat > $test.c <<EOF
#include <stdio.h>
#include <stdarg.h>
#include "zconf.h"
int main()
{
#ifdef STDC
  return 0;
#endif
  return 1;
}
EOF
if try $CC -c $CFLAGS $test.c; then
  echo "Checking for ANSI C compliant compiler...  Yes." | tee -a configure.log
  :
else
  echo "Checking for ANSI C compliant compiler...  No." | tee -a configure.log
  echo "Error: ANSI C compatible compiler needed, cannot continue." | tee -a configure.log
  leave 1
fi

# see if we can hide zlib internal symbols that are linked between separate source files using hidden
if test "$gcc" -eq 1; then
  echo >> configure.log
  cat > $test.c <<EOF
#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 >> configure.log
    echo "Checking for attribute(visibility(hidden)) support... Yes." | tee -a configure.log
  else
    echo >> configure.log
    echo "Checking for attribute(visibility(hidden)) support... No." | tee -a configure.log
  fi
fi

# see if we can hide zlib internal symbols that are linked between separate source files using internal
if test "$gcc" -eq 1; then
  echo >> configure.log
  cat > $test.c <<EOF
#define ZLIB_INTERNAL __attribute__((visibility ("internal")))
int ZLIB_INTERNAL foo;
int main()
{
  return 0;
}
EOF
  if tryboth $CC -c $CFLAGS $test.c; then
    CFLAGS="$CFLAGS -DHAVE_INTERNAL"
    SFLAGS="$SFLAGS -DHAVE_INTERNAL"
    echo >> configure.log
    echo "Checking for attribute(visibility(internal)) support... Yes." | tee -a configure.log
  else
    echo >> configure.log
    echo "Checking for attribute(visibility(internal)) support... No." | tee -a configure.log
  fi
fi

# Check for __builtin_ctzl() support in compiler
cat > $test.c << EOF
int main(void)
{
    unsigned int zero = 0;
    long test = __builtin_ctzl(zero);
    (void)test;
    return 0;
}
EOF
if try ${CC} ${CFLAGS} $test.c; then
    echo "Checking for __builtin_ctzl ... Yes." | tee -a configure.log
    CFLAGS="$CFLAGS -DHAVE_BUILTIN_CTZL"
    SFLAGS="$SFLAGS -DHAVE_BUILTIN_CTZL"
else
    echo "Checking for __builtin_ctzl ... No." | tee -a configure.log
fi

# Check for SSE2 intrinsics
cat > $test.c << EOF
#include <immintrin.h>
int main(void)
{
    __m128i zero = _mm_setzero_si128();
    (void)zero;
    return 0;
}
EOF
if try ${CC} ${CFLAGS} -msse2 $test.c; then
    echo "Checking for SSE2 intrinsics ... Yes." | tee -a configure.log
    HAVE_SSE2_INTRIN=1
else
    echo "Checking for SSE2 intrinsics ... No." | tee -a configure.log
    HAVE_SSE2_INTRIN=0
fi

# Check for PCLMULQDQ intrinsics
cat > $test.c << EOF
#include <immintrin.h>
#include <wmmintrin.h>
int main(void)
{
    __m128i a = _mm_setzero_si128();
    __m128i b = _mm_setzero_si128();
    __m128i c = _mm_clmulepi64_si128(a, b, 0x10);
    (void)c;
    return 0;
}
EOF
if try ${CC} ${CFLAGS} -mpclmul $test.c; then
    echo "Checking for PCLMULQDQ intrinsics ... Yes." | tee -a configure.log
    HAVE_PCLMULQDQ_INTRIN=1
else
    echo "Checking for PCLMULQDQ intrinsics ... No." | tee -a configure.log
    HAVE_PCLMULQDQ_INTRIN=0
fi

# Enable deflate_medium at level 4-6
if test $without_new_strategies -eq 0; then
    CFLAGS="${CFLAGS} -DMEDIUM_STRATEGY"
    SFLAGS="${SFLAGS} -DMEDIUM_STRATEGY"
fi

ARCHDIR='arch/generic'
ARCH_STATIC_OBJS=''
ARCH_SHARED_OBJS=''

# Set ARCH specific FLAGS
case "${ARCH}" in

    # x86 and x86_64 specific optimizations
    i386 | i486 | i586 | i686 | x86_64)
	ARCHDIR=arch/x86

        case "${ARCH}" in
            x86_64)
                CFLAGS="${CFLAGS} -DX86_64 -DX86_NOCHECK_SSE2"
                SFLAGS="${SFLAGS} -DX86_64 -DX86_NOCHECK_SSE2"
            ;;
            i386 | i486 | i586 | i686)
                CFLAGS="${CFLAGS} -DX86"
                SFLAGS="${SFLAGS} -DX86"
            ;;
        esac

        CFLAGS="${CFLAGS} -DUNALIGNED_OK -DUNROLL_LESS -DX86_CPUID"
        SFLAGS="${SFLAGS} -DUNALIGNED_OK -DUNROLL_LESS -DX86_CPUID"

	# Enable arch-specific optimizations?
	if test $without_optimizations -eq 0; then
            ARCH_STATIC_OBJS="${ARCH_STATIC_OBJS} x86.o"
            ARCH_SHARED_OBJS="${ARCH_SHARED_OBJS} x86.lo"

            if test ${HAVE_SSE2_INTRIN} -eq 1; then
                CFLAGS="${CFLAGS} -DX86_SSE2_FILL_WINDOW"
                SFLAGS="${SFLAGS} -DX86_SSE2_FILL_WINDOW"
                ARCH_STATIC_OBJS="${ARCH_STATIC_OBJS} fill_window_sse.o"
                ARCH_SHARED_OBJS="${ARCH_SHARED_OBJS} fill_window_sse.lo"
            fi

            CFLAGS="${CFLAGS} -DX86_SSE4_2_CRC_HASH"
            SFLAGS="${SFLAGS} -DX86_SSE4_2_CRC_HASH"
            ARCH_STATIC_OBJS="${ARCH_STATIC_OBJS} insert_string_sse.o"
            ARCH_SHARED_OBJS="${ARCH_SHARED_OBJS} insert_string_sse.lo"

            if test ${HAVE_PCLMULQDQ_INTRIN} -eq 1; then
                CFLAGS="${CFLAGS} -DX86_PCLMULQDQ_CRC"
                SFLAGS="${SFLAGS} -DX86_PCLMULQDQ_CRC"
                ARCH_STATIC_OBJS="${ARCH_STATIC_OBJS} crc_folding.o"
                ARCH_SHARED_OBJS="${ARCH_SHARED_OBJS} crc_folding.lo"
            fi

	    # Enable deflate_quick at level 1?
	    # requires SSE2: code uses fill_window_sse
            if test ${HAVE_SSE2_INTRIN} -eq 1 && test $without_new_strategies -eq 0; then
                CFLAGS="${CFLAGS} -DX86_QUICK_STRATEGY"
                SFLAGS="${SFLAGS} -DX86_QUICK_STRATEGY"

                ARCH_STATIC_OBJS="${ARCH_STATIC_OBJS} deflate_quick.o"
                ARCH_SHARED_OBJS="${ARCH_SHARED_OBJS} deflate_quick.lo"
            fi
        fi
    ;;

    # ARM specific optimizations
    armv3l | armv4b | armv4l | armv4tl | armv5tel | armv5tejl | armv6l | armv6hl | armv7l | armv7hl | armv7hnl)
	ARCHDIR=arch/arm

        case "${ARCH}" in
            armv6l | armv6hl)
                # Tests done on Raspberry pi (armv6hl) indicate that UNALIGNED_OK and UNROLL_LESS both
                # provide performance improvements, totaling about 1.5% for the two.
                CFLAGS="${CFLAGS} -DUNALIGNED_OK -DUNROLL_LESS"
                SFLAGS="${SFLAGS} -DUNALIGNED_OK -DUNROLL_LESS"
            ;;
        esac

    ;;
esac

echo "ARCH: ${ARCH}"
echo "Using arch directory: ${ARCHDIR}"

# 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 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 DEFFILE = $DEFFILE >> configure.log
echo RC = $RC >> configure.log
echo RCFLAGS = $RCFLAGS >> configure.log
echo RCOBJS = $RCOBJS >> configure.log
echo STRIP = $STRIP >> 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 SHAREDTARGET = $SHAREDTARGET >> configure.log
echo IMPORTLIB = $IMPORTLIB >> configure.log
echo INSTALLTARGETS = $INSTALLTARGETS >> configure.log
echo UNINSTALLTARGETS = $UNINSTALLTARGETS >> configure.log
echo SRCDIR = $SRCDIR >> configure.log
echo BUILDDIR = $BUILDDIR >> configure.log
echo STATICLIB = $STATICLIB >> configure.log
echo TEST = $TEST >> configure.log
echo VER = $VER >> configure.log
echo exec_prefix = $exec_prefix >> configure.log
echo includedir = $includedir >> configure.log
echo bindir = $bindir >> 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 ARCHDIR = ${ARCHDIR} >> configure.log
echo ARCH_STATIC_OBJS = ${ARCH_STATIC_OBJS} >> configure.log
echo ARCH_SHARED_OBJS = ${ARCH_SHARED_OBJS} >> configure.log

# update Makefile with the configure results

INCLUDES="-I$SRCDIR"
if [ "$SRCDIR" != "$BUILDDIR" ]; then INCLUDES="-I$BUILDDIR ${INCLUDES}"; fi

sed < $SRCDIR/Makefile.in "
/^CC *=/s#=.*#=$CC#
/^CFLAGS *=/s#=.*#=$CFLAGS#
/^SFLAGS *=/s#=.*#=$SFLAGS#
/^LDFLAGS *=/s#=.*#=$LDFLAGS#
/^LDSHARED *=/s#=.*#=$LDSHARED#
/^STATICLIB *=/s#=.*#=$STATICLIB#
/^SHAREDLIB *=/s#=.*#=$SHAREDLIB#
/^SHAREDLIBV *=/s#=.*#=$SHAREDLIBV#
/^SHAREDLIBM *=/s#=.*#=$SHAREDLIBM#
/^SHAREDTARGET *=/s#=.*#=$SHAREDTARGET#
/^IMPORTLIB *=/s#=.*#=$IMPORTLIB#
/^AR *=/s#=.*#=$AR#
/^ARFLAGS *=/s#=.*#=$ARFLAGS#
/^RANLIB *=/s#=.*#=$RANLIB#
/^LDCONFIG *=/s#=.*#=$LDCONFIG#
/^LDSHAREDLIBC *=/s#=.*#=$LDSHAREDLIBC#
/^DEFFILE *=/s#=.*#=$DEFFILE#
/^RC *=/s#=.*#=$RC#
/^RCFLAGS *=/s#=.*#=$RCFLAGS#
/^RCOBJS *=/s#=.*#=$RCOBJS#
/^STRIP *=/s#=.*#=$STRIP#
/^EXE *=/s#=.*#=$EXE#
/^prefix *=/s#=.*#= $prefix#
/^exec_prefix *=/s#=.*#= $exec_prefix#
/^bindir *=/s#=.*#= $bindir#
/^libdir *=/s#=.*#= $libdir#
/^sharedlibdir *=/s#=.*#= $sharedlibdir#
/^includedir *=/s#=.*#= $includedir#
/^mandir *=/s#=.*#= $mandir#
/^SRCDIR *=/s#=.*#=$SRCDIR#
/^INCLUDES *=/s#=.*#=$INCLUDES#
/^OBJC *=/s#=.*#= $OBJC#
/^PIC_OBJC *=/s#=.*#= $PIC_OBJC#
/^all: */s#:.*#: $ALL#
/^install-libs: */s#:.*#: $INSTALLTARGETS#
/^uninstall-libs: */s#:.*#: $UNINSTALLTARGETS#
/^ARCHDIR *=/s#=.*#=$ARCHDIR#
/^ARCH_STATIC_OBJS *=/s#=.*#=$ARCH_STATIC_OBJS#
/^ARCH_SHARED_OBJS *=/s#=.*#=$ARCH_SHARED_OBJS#
" > Makefile

# Generate Makefile in arch dir
mkdir -p $ARCHDIR

ARCHINCLUDES="-I$SRCDIR/$ARCHDIR -I$SRCDIR"
if [ "$SRCDIR" != "$BUILDDIR" ]; then ARCHINCLUDES="-I$BUILDDIR ${ARCHINCLUDES}"; fi

sed < $SRCDIR/$ARCHDIR/Makefile.in "
/^CC *=/s#=.*#=$CC#
/^CFLAGS *=/s#=.*#=$CFLAGS#
/^SFLAGS *=/s#=.*#=$SFLAGS#
/^INCLUDES *=/s#=.*#=$ARCHINCLUDES#
/^SRCDIR *=/s#=.*#=$SRCDIR/$ARCHDIR#
/^SRCTOP *=/s#=.*#=$SRCDIR#
" > $ARCHDIR/Makefile

# Generate Makefile in test dir
mkdir -p test
TESTINCLUDES="-I$SRCDIR"
if [ "$SRCDIR" != "$BUILDDIR" ]; then TESTINCLUDES="${TESTINCLUDES} -I$BUILDDIR"; fi
if test $compat -eq 1; then COMPATTESTS="compattests"; fi
sed < $SRCDIR/test/Makefile.in "
/^CC *=/s#=.*#=$CC#
/^CFLAGS *=/s#=.*#=$CFLAGS#
/^EXE *=/s#=.*#=$EXE#
/^oldtests: */s#:.*#: $TEST#
/^INCLUDES *=/s#=.*#=$TESTINCLUDES#
/^SRCDIR *=/s#=.*#=$SRCDIR/test#
/^SRCTOP *=/s#=.*#=$SRCDIR#
/^COMPATTESTS *=/s#=.*#=$COMPATTESTS#
" > test/Makefile

# create zlib.pc with the configure results
sed < $SRCDIR/zlib.pc.in "
/^CC *=/s#=.*#=$CC#
/^CFLAGS *=/s#=.*#=$CFLAGS#
/^LDSHARED *=/s#=.*#=$LDSHARED#
/^STATICLIB *=/s#=.*#=$STATICLIB#
/^SHAREDLIB *=/s#=.*#=$SHAREDLIB#
/^SHAREDLIBV *=/s#=.*#=$SHAREDLIBV#
/^SHAREDLIBM *=/s#=.*#=$SHAREDLIBM#
/^IMPORTLIB *=/s#=.*#=$IMPORTLIB#
/^AR *=/s#=.*#=$AR#
/^ARFLAGS *=/s#=.*#=$ARFLAGS#
/^RANLIB *=/s#=.*#=$RANLIB#
/^EXE *=/s#=.*#=$EXE#
/^prefix *=/s#=.*#=$prefix#
/^exec_prefix *=/s#=.*#=$exec_prefix#
/^bindir *=/s#=.*#=$bindir#
/^libdir *=/s#=.*#=$libdir#
/^sharedlibdir *=/s#=.*#=$sharedlibdir#
/^includedir *=/s#=.*#=$includedir#
/^mandir *=/s#=.*#=$mandir#
/^LDFLAGS *=/s#=.*#=$LDFLAGS#
" | sed -e "
s/\@VERSION\@/$VER/g;
" > zlib.pc

# done
leave 0