src/configure - platform/external/zlib - Git at Google

 #!/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.

 echo -------------------- >> configure.log
 echo $0 $* >> configure.log
 date >> configure.log

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

 STATICLIB=libz.a
 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`
 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
 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)'

 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

 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 > $test.c <<EOF
 #error error
 EOF
 if ($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

 echo >> configure.log

 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"}
 # to force the asm version use: CFLAGS="-O3 -DASMV" ./configure
 case "$cc" in
   *gcc*) gcc=1 ;;
 esac
 case `$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 $VER3"}
              AR="libtool"
              ARFLAGS="-o" ;;
   *)             LDSHARED=${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=${LDSHARED-"cc -G"}
          case `(uname -m || echo unknown) 2>/dev/null` in
          i86*)
              SFLAGS=${CFLAGS-"-xpentium -fast -KPIC -R."}
              CFLAGS=${CFLAGS-"-xpentium -fast"} ;;
          *)
              SFLAGS=${CFLAGS-"-fast -xcg92 -KPIC -R."}
              CFLAGS=${CFLAGS-"-fast -xcg92"} ;;
          esac ;;
   SunOS\ 4*) SFLAGS=${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

 SHAREDLIB=${SHAREDLIB-"libz$shared_ext"}
 SHAREDLIBV=${SHAREDLIBV-"libz$shared_ext.$VER"}
 SHAREDLIBM=${SHAREDLIBM-"libz$shared_ext.$VER1"}

 echo >> configure.log

 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

 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

 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

 cp -p zconf.h.in zconf.h

 echo >> configure.log

 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

 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 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 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 test $cover -eq 1; then
   CFLAGS="${CFLAGS} -fprofile-arcs -ftest-coverage"
 fi

 echo >> configure.log

 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

 if test "$gcc" -eq 1; then
   echo >> configure.log
   cat > $test.c <<EOF
 #if ((__GNUC__-0) * 10 + __GNUC_MINOR__-0 >= 33)
 #  define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
 #else
 #  define ZLIB_INTERNAL
 #endif
 int ZLIB_INTERNAL foo;
 int main()
 {
   return 0;
 }
 EOF
   if try $CC -c $CFLAGS $test.c; then
     echo "Checking for attribute(visibility) support... Yes." | tee -a configure.log
   else
     CFLAGS="$CFLAGS -DNO_VIZ"
     SFLAGS="$SFLAGS -DNO_VIZ"
     echo "Checking for attribute(visibility) support... No." | tee -a configure.log
   fi
 fi

 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 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
 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

 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
	#!/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.

	echo -------------------- >> configure.log
	echo $0 $* >> configure.log
	date >> configure.log

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

	STATICLIB=libz.a
	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`
	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
	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)'

	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

	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 > $test.c <<EOF
	#error error
	EOF
	if ($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

	echo >> configure.log

	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"}
	# to force the asm version use: CFLAGS="-O3 -DASMV" ./configure
	case "$cc" in
	gcc) gcc=1 ;;
	esac
	case `$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 $VER3"}
	AR="libtool"
	ARFLAGS="-o" ;;
	*) LDSHARED=${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=${LDSHARED-"cc -G"}
	case `(uname -m \|\| echo unknown) 2>/dev/null` in
	i86*)
	SFLAGS=${CFLAGS-"-xpentium -fast -KPIC -R."}
	CFLAGS=${CFLAGS-"-xpentium -fast"} ;;
	*)
	SFLAGS=${CFLAGS-"-fast -xcg92 -KPIC -R."}
	CFLAGS=${CFLAGS-"-fast -xcg92"} ;;
	esac ;;
	SunOS\ 4*) SFLAGS=${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

	SHAREDLIB=${SHAREDLIB-"libz$shared_ext"}
	SHAREDLIBV=${SHAREDLIBV-"libz$shared_ext.$VER"}
	SHAREDLIBM=${SHAREDLIBM-"libz$shared_ext.$VER1"}

	echo >> configure.log

	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

	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

	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

	cp -p zconf.h.in zconf.h

	echo >> configure.log

	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

	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 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 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 test $cover -eq 1; then
	CFLAGS="${CFLAGS} -fprofile-arcs -ftest-coverage"
	fi

	echo >> configure.log

	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

	if test "$gcc" -eq 1; then
	echo >> configure.log
	cat > $test.c <<EOF
	#if ((__GNUC__-0) * 10 + __GNUC_MINOR__-0 >= 33)
	# define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
	#else
	# define ZLIB_INTERNAL
	#endif
	int ZLIB_INTERNAL foo;
	int main()
	{
	return 0;
	}
	EOF
	if try $CC -c $CFLAGS $test.c; then
	echo "Checking for attribute(visibility) support... Yes." \| tee -a configure.log
	else
	CFLAGS="$CFLAGS -DNO_VIZ"
	SFLAGS="$SFLAGS -DNO_VIZ"
	echo "Checking for attribute(visibility) support... No." \| tee -a configure.log
	fi
	fi

	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 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
	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

	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