kc3-lang/zlib/configure

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• Author : Thomas de Grivel
  Date : 2025-10-27 08:59:37
  Hash : 1a31123c
  Message : accept options host and target

• configure

• #!/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
  
  # get source directory
  SRCDIR=`dirname $0`
  if test $SRCDIR = "."; then
      ZINC=""
      ZINCOUT="-I."
      SRCDIR=""
  else
      ZINC='-I. -include zconf.h'
      ZINCOUT='-I. -I$(SRCDIR)'
      SRCDIR="$SRCDIR/"
  fi
  
  # set command prefix for cross-compilation
  if [ -n "${CHOST}" ]; then
      uname=${CHOST}
      mname=${CHOST}
      CROSS_PREFIX="${CHOST}-"
  else
      mname=`(uname -a || echo unknown) 2>/dev/null`
  fi
  
  # destination name for static library
  STATICLIB=libz.a
  
  # extract zlib version numbers from zlib.h
  VER=`sed -n -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < ${SRCDIR}zlib.h`
  VER3=`echo ${VER}|sed -n -e 's/\([0-9]\{1,\}\(\\.[0-9]\{1,\}\)\{1,2\}\).*/\1/p'`
  VER1=`echo ${VER}|sed -n -e 's/\([0-9]\{1,\}\)\\..*/\1/p'`
  
  # establish commands for library building
  if "${CROSS_PREFIX}ar" --version >/dev/null 2>/dev/null || test $? -lt 126; then
      : ${AR:="${CROSS_PREFIX}ar"}
      test -n "${CROSS_PREFIX}" && echo Using ${AR} | tee -a configure.log
  else
      : ${AR:="ar"}
      test -n "${CROSS_PREFIX}" && echo Using ${AR} | tee -a configure.log
  fi
  : ${ARFLAGS:="rc"}
  if "${CROSS_PREFIX}ranlib" --version >/dev/null 2>/dev/null || test $? -lt 126; then
      : ${RANLIB:="${CROSS_PREFIX}ranlib"}
      test -n "${CROSS_PREFIX}" && echo Using ${RANLIB} | tee -a configure.log
  else
      : ${RANLIB:="ranlib"}
  fi
  if "${CROSS_PREFIX}nm" --version >/dev/null 2>/dev/null || test $? -lt 126; then
      : ${NM:="${CROSS_PREFIX}nm"}
      test -n "${CROSS_PREFIX}" && echo Using ${NM} | tee -a configure.log
  else
      : ${NM:="nm"}
  fi
  
  # set defaults before processing command line options
  : ${LDCONFIG:="ldconfig"}
  : ${LDSHAREDLIBC:=-lc}
  ARCHS=
  : ${prefix:=/usr/local}
  : ${exec_prefix:='${prefix}'}
  : ${libdir:='${exec_prefix}/lib'}
  : ${sharedlibdir:='${libdir}'}
  : ${includedir:='${prefix}/include'}
  : ${mandir:='${prefix}/share/man'}
  shared_ext='.so'
  shared=1
  solo=0
  cover=0
  zprefix=0
  zconst=0
  build64=0
  gcc=0
  warn=0
  debug=0
  address=0
  memory=0
  old_cc="$CC"
  old_cflags="$CFLAGS"
  OBJC='$(OBJZ) $(OBJG)'
  PIC_OBJC='$(PIC_OBJZ) $(PIC_OBJG)'
  
  # leave this script, optionally in a bad way
  leave()
  {
    if test "$*" != "0"; then
      echo "** $0 aborting." | tee -a configure.log
    fi
    rm -rf $test.[co] $test $test$shared_ext $test.gcno $test.dSYM ./--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 [--const] [--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 ;;
      -c* | --const) zconst=1; shift ;;
      -w* | --warn) warn=1; shift ;;
      -d* | --debug) debug=1; shift ;;
      --sanitize) address=1; shift ;;
      --address) address=1; shift ;;
      --memory) memory=1; shift ;;
      --host) host=$2; shift 2 ;;
      --target) target=$2; shift 2 ;;
      *)
        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
  
  if test -z "$CC"; then
    echo Checking for ${CROSS_PREFIX}gcc... | tee -a configure.log
    if ${CROSS_PREFIX}gcc -v >/dev/null 2>&1; then
      cc=${CROSS_PREFIX}gcc
    else
      cc=${CROSS_PREFIX}cc
    fi
  else
    cc=${CC}
  fi
  
  case "$cc" in
    *gcc*) gcc=1 ;;
    *clang*) gcc=1 ;;
  esac
  case `$cc -v 2>&1` in
    *gcc*) gcc=1 ;;
    *clang*) 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"
    CFLAGS="${CFLAGS--O3}"
    SFLAGS="${CFLAGS--O3} -fPIC"
    if test "$ARCHS"; then
      CFLAGS="${CFLAGS} ${ARCHS}"
      LDFLAGS="${LDFLAGS} ${ARCHS}"
    fi
    if test $build64 -eq 1; then
      CFLAGS="${CFLAGS} -m64"
      SFLAGS="${SFLAGS} -m64"
    fi
    if test "$warn" -eq 1; then
      if test "$zconst" -eq 1; then
        CFLAGS="${CFLAGS} -Wall -Wextra -Wcast-qual -DZLIB_CONST"
      else
        CFLAGS="${CFLAGS} -Wall -Wextra"
      fi
    fi
    if test $address -eq 1; then
      CFLAGS="${CFLAGS} -g -fsanitize=address -fno-omit-frame-pointer"
    fi
    if test $memory -eq 1; then
      CFLAGS="${CFLAGS} -g -fsanitize=memory -fno-omit-frame-pointer"
    fi
    if test $debug -eq 1; then
      CFLAGS="${CFLAGS} -DZLIB_DEBUG"
      SFLAGS="${SFLAGS} -DZLIB_DEBUG"
    fi
    if test -z "$uname"; then
      uname=`(uname -s || echo unknown) 2>/dev/null`
    fi
    case "$uname" in
    Linux* | linux* | *-linux* | GNU | GNU/* | solaris*)
          case "$mname" in
          *sparc*)
              LDFLAGS="${LDFLAGS} -Wl,--no-warn-rwx-segments" ;;
          esac
          LDSHARED=${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* | *-cygwin* | OS/2*)
          EXE='.exe' ;;
    MINGW* | mingw* | *-mingw*)
          rm -f $test.[co] $test $test$shared_ext
          echo "If this doesn't work for you, try win32/Makefile.gcc." | tee -a configure.log
          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 $SFLAGS"}
          case `(uname -m || echo unknown) 2>/dev/null` in
          ia64)
              shared_ext='.so'
              SHAREDLIB='libz.so' ;;
          *)
              shared_ext='.sl'
              SHAREDLIB='libz.sl' ;;
          esac ;;
    AIX*)
          LDFLAGS="${LDFLAGS} -Wl,-brtl" ;;
    Darwin* | 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 $VER3"}
          if "${CROSS_PREFIX}libtool" -V 2>&1 | grep Apple > /dev/null; then
              AR="${CROSS_PREFIX}libtool"
          elif libtool -V 2>&1 | grep Apple > /dev/null; then
              AR="libtool"
          else
              AR="/usr/bin/libtool"
          fi
          ARFLAGS="-o" ;;
    *)
          LDSHARED=${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=${LDSHARED-"ld -b"}
           case `(uname -m || echo unknown) 2>/dev/null` in
           ia64)
               shared_ext='.so'
               SHAREDLIB='libz.so' ;;
           *)
               shared_ext='.sl'
               SHAREDLIB='libz.sl' ;;
           esac ;;
    IRIX*)     SFLAGS=${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="$CFLAGS -xarch=v9" ;;
                   esac
               fi
           fi
           if test -n "$ZINC"; then
               ZINC='-I- -I. -I$(SRCDIR)'
           fi
           ;;
    SunOS\ 4*) SFLAGS=${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
  
  # 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 $*
      got=`( $* ) 2>&1`
      ret=$?
      if test "$got" != ""; then
        printf "%s\n" "$got" >> configure.log
      fi
      if test $ret -ne 0; then
        echo "(exit code "$ret")" >> configure.log
      fi
      return $ret
    }
  fi
  
  tryboth()
  {
    show $*
    got=`( $* ) 2>&1`
    ret=$?
    if test "$got" != ""; then
      printf "%s\n" "$got" >> configure.log
    fi
    if test $ret -ne 0; then
      echo "(exit code "$ret")" >> configure.log
      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 -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 size_t
  cat > $test.c <<EOF
  #include <stdio.h>
  #include <stdlib.h>
  size_t dummy = 0;
  EOF
  if try $CC -c $CFLAGS $test.c; then
    echo "Checking for size_t... Yes." | tee -a configure.log
  else
    echo "Checking for size_t... No." | tee -a configure.log
    # find a size_t integer type
    # check for long long
    cat > $test.c << EOF
  long long dummy = 0;
  EOF
    if try $CC -c $CFLAGS $test.c; then
      echo "Checking for long long... Yes." | tee -a configure.log
      cat > $test.c <<EOF
  #include <stdio.h>
  int main(void) {
      if (sizeof(void *) <= sizeof(int)) puts("int");
      else if (sizeof(void *) <= sizeof(long)) puts("long");
      else puts("z_longlong");
      return 0;
  }
  EOF
    else
      echo "Checking for long long... No." | tee -a configure.log
      cat > $test.c <<EOF
  #include <stdio.h>
  int main(void) {
      if (sizeof(void *) <= sizeof(int)) puts("int");
      else puts("long");
      return 0;
  }
  EOF
    fi
    if try $CC $CFLAGS -o $test $test.c; then
      sizet=`./$test`
      echo "Checking for a pointer-size integer type..." $sizet"." | tee -a configure.log
      CFLAGS="${CFLAGS} -DNO_SIZE_T=${sizet}"
      SFLAGS="${SFLAGS} -DNO_SIZE_T=${sizet}"
    else
      echo "Checking for a pointer-size integer type... not found." | tee -a configure.log
    fi
  fi
  
  echo >> configure.log
  
  # check for large file support, and if none, check for fseeko()
  cat > $test.c <<EOF
  #include <sys/types.h>
  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
  
  # 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 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 <<EOF
  #include <stdio.h>
  #include <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 <<EOF
  #include <stdio.h>
  #include <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 <<EOF
  #include <stdio.h>
  #include <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 <<EOF
  #include <stdio.h>
  #include <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 <<EOF
  #include <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 <<EOF
  #include <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 <<EOF
  #include <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 <<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 "Checking for attribute(visibility) support... Yes." | tee -a configure.log
    else
      echo "Checking for attribute(visibility) support... No." | tee -a configure.log
    fi
  fi
  
  # 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 SRCDIR = $SRCDIR >> 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
  
  # update Makefile with the configure results
  sed < ${SRCDIR}Makefile.in "
  /^CC *=/s#=.*#=$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#=.*#=$EXE#
  /^SRCDIR *=/s#=.*#=$SRCDIR#
  /^ZINC *=/s#=.*#=$ZINC#
  /^ZINCOUT *=/s#=.*#=$ZINCOUT#
  /^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 < ${SRCDIR}zlib.pc.in "
  /^CC *=/s#=.*#=$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
  
  # done
  leave 0