1  #!/bin/sh
  2  # configure script for zlib.
  3  #
  4  # Normally configure builds both a static and a shared library.
  5  # If you want to build just a static library, use: ./configure --static
  6  #
  7  # To impose specific compiler or flags or install directory, use for example:
  8  #    prefix=$HOME CC=cc CFLAGS="-O4" ./configure
  9  # or for csh/tcsh users:
 10  #    (setenv prefix $HOME; setenv CC cc; setenv CFLAGS "-O4"; ./configure)
 11  
 12  # Incorrect settings of CC or CFLAGS may prevent creating a shared library.
 13  # If you have problems, try without defining CC and CFLAGS before reporting
 14  # an error.
 15  
 16  # start off configure.log
 17  echo -------------------- >> configure.log
 18  echo $0 $* >> configure.log
 19  date >> configure.log
 20  
 21  # get source directory
 22  SRCDIR=`dirname $0`
 23  if test $SRCDIR = "."; then
 24      ZINC=""
 25      ZINCOUT="-I."
 26      SRCDIR=""
 27  else
 28      ZINC='-include zconf.h'
 29      ZINCOUT='-I. -I$(SRCDIR)'
 30      SRCDIR="$SRCDIR/"
 31  fi
 32  
 33  # set command prefix for cross-compilation
 34  if [ -n "${CHOST}" ]; then
 35      uname="`echo "${CHOST}" | sed -e 's/^[^-]*-\([^-]*\)$/\1/' -e 's/^[^-]*-[^-]*-\([^-]*\)$/\1/' -e 's/^[^-]*-[^-]*-\([^-]*\)-.*$/\1/'`"
 36      CROSS_PREFIX="${CHOST}-"
 37  fi
 38  
 39  # destination name for static library
 40  STATICLIB=libz.a
 41  
 42  # extract zlib version numbers from zlib.h
 43  VER=`sed -n -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < ${SRCDIR}zlib.h`
 44  VER3=`sed -n -e '/VERSION "/s/.*"\([0-9]*\\.[0-9]*\\.[0-9]*\).*/\1/p' < ${SRCDIR}zlib.h`
 45  VER2=`sed -n -e '/VERSION "/s/.*"\([0-9]*\\.[0-9]*\)\\..*/\1/p' < ${SRCDIR}zlib.h`
 46  VER1=`sed -n -e '/VERSION "/s/.*"\([0-9]*\)\\..*/\1/p' < ${SRCDIR}zlib.h`
 47  
 48  # establish commands for library building
 49  if "${CROSS_PREFIX}ar" --version >/dev/null 2>/dev/null || test $? -lt 126; then
 50      AR=${AR-"${CROSS_PREFIX}ar"}
 51      test -n "${CROSS_PREFIX}" && echo Using ${AR} | tee -a configure.log
 52  else
 53      AR=${AR-"ar"}
 54      test -n "${CROSS_PREFIX}" && echo Using ${AR} | tee -a configure.log
 55  fi
 56  ARFLAGS=${ARFLAGS-"rc"}
 57  if "${CROSS_PREFIX}ranlib" --version >/dev/null 2>/dev/null || test $? -lt 126; then
 58      RANLIB=${RANLIB-"${CROSS_PREFIX}ranlib"}
 59      test -n "${CROSS_PREFIX}" && echo Using ${RANLIB} | tee -a configure.log
 60  else
 61      RANLIB=${RANLIB-"ranlib"}
 62  fi
 63  if "${CROSS_PREFIX}nm" --version >/dev/null 2>/dev/null || test $? -lt 126; then
 64      NM=${NM-"${CROSS_PREFIX}nm"}
 65      test -n "${CROSS_PREFIX}" && echo Using ${NM} | tee -a configure.log
 66  else
 67      NM=${NM-"nm"}
 68  fi
 69  
 70  # set defaults before processing command line options
 71  LDCONFIG=${LDCONFIG-"ldconfig"}
 72  LDSHAREDLIBC="${LDSHAREDLIBC--lc}"
 73  ARCHS=
 74  prefix=${prefix-/usr/local}
 75  exec_prefix=${exec_prefix-'${prefix}'}
 76  libdir=${libdir-'${exec_prefix}/lib'}
 77  sharedlibdir=${sharedlibdir-'${libdir}'}
 78  includedir=${includedir-'${prefix}/include'}
 79  mandir=${mandir-'${prefix}/share/man'}
 80  shared_ext='.so'
 81  shared=1
 82  solo=0
 83  cover=0
 84  zprefix=0
 85  zconst=0
 86  build64=0
 87  gcc=0
 88  warn=0
 89  debug=0
 90  old_cc="$CC"
 91  old_cflags="$CFLAGS"
 92  OBJC='$(OBJZ) $(OBJG)'
 93  PIC_OBJC='$(PIC_OBJZ) $(PIC_OBJG)'
 94  
 95  # leave this script, optionally in a bad way
 96  leave()
 97  {
 98    if test "$*" != "0"; then
 99      echo "** $0 aborting." | tee -a configure.log
100    fi
101    rm -f $test.[co] $test $test$shared_ext $test.gcno ./--version
102    echo -------------------- >> configure.log
103    echo >> configure.log
104    echo >> configure.log
105    exit $1
106  }
107  
108  # process command line options
109  while test $# -ge 1
110  do
111  case "$1" in
112      -h* | --help)
113        echo 'usage:' | tee -a configure.log
114        echo '  configure [--const] [--zprefix] [--prefix=PREFIX]  [--eprefix=EXPREFIX]' | tee -a configure.log
115        echo '    [--static] [--64] [--libdir=LIBDIR] [--sharedlibdir=LIBDIR]' | tee -a configure.log
116        echo '    [--includedir=INCLUDEDIR] [--archs="-arch i386 -arch x86_64"]' | tee -a configure.log
117          exit 0 ;;
118      -p*=* | --prefix=*) prefix=`echo $1 | sed 's/.*=//'`; shift ;;
119      -e*=* | --eprefix=*) exec_prefix=`echo $1 | sed 's/.*=//'`; shift ;;
120      -l*=* | --libdir=*) libdir=`echo $1 | sed 's/.*=//'`; shift ;;
121      --sharedlibdir=*) sharedlibdir=`echo $1 | sed 's/.*=//'`; shift ;;
122      -i*=* | --includedir=*) includedir=`echo $1 | sed 's/.*=//'`;shift ;;
123      -u*=* | --uname=*) uname=`echo $1 | sed 's/.*=//'`;shift ;;
124      -p* | --prefix) prefix="$2"; shift; shift ;;
125      -e* | --eprefix) exec_prefix="$2"; shift; shift ;;
126      -l* | --libdir) libdir="$2"; shift; shift ;;
127      -i* | --includedir) includedir="$2"; shift; shift ;;
128      -s* | --shared | --enable-shared) shared=1; shift ;;
129      -t | --static) shared=0; shift ;;
130      --solo) solo=1; shift ;;
131      --cover) cover=1; shift ;;
132      -z* | --zprefix) zprefix=1; shift ;;
133      -6* | --64) build64=1; shift ;;
134      -a*=* | --archs=*) ARCHS=`echo $1 | sed 's/.*=//'`; shift ;;
135      --sysconfdir=*) echo "ignored option: --sysconfdir" | tee -a configure.log; shift ;;
136      --localstatedir=*) echo "ignored option: --localstatedir" | tee -a configure.log; shift ;;
137      -c* | --const) zconst=1; shift ;;
138      -w* | --warn) warn=1; shift ;;
139      -d* | --debug) debug=1; shift ;;
140      *)
141        echo "unknown option: $1" | tee -a configure.log
142        echo "$0 --help for help" | tee -a configure.log
143        leave 1;;
144      esac
145  done
146  
147  # temporary file name
148  test=ztest$$
149  
150  # put arguments in log, also put test file in log if used in arguments
151  show()
152  {
153    case "$*" in
154      *$test.c*)
155        echo === $test.c === >> configure.log
156        cat $test.c >> configure.log
157        echo === >> configure.log;;
158    esac
159    echo $* >> configure.log
160  }
161  
162  # check for gcc vs. cc and set compile and link flags based on the system identified by uname
163  cat > $test.c <<EOF
164  extern int getchar();
165  int hello() {return getchar();}
166  EOF
167  
168  test -z "$CC" && echo Checking for ${CROSS_PREFIX}gcc... | tee -a configure.log
169  cc=${CC-${CROSS_PREFIX}gcc}
170  cflags=${CFLAGS-"-O3"}
171  # to force the asm version use: CFLAGS="-O3 -DASMV" ./configure
172  case "$cc" in
173    *gcc*) gcc=1 ;;
174    *clang*) gcc=1 ;;
175  esac
176  case `$cc -v 2>&1` in
177    *gcc*) gcc=1 ;;
178    *clang*) gcc=1 ;;
179  esac
180  
181  show $cc -c $test.c
182  if test "$gcc" -eq 1 && ($cc -c $test.c) >> configure.log 2>&1; then
183    echo ... using gcc >> configure.log
184    CC="$cc"
185    CFLAGS="${CFLAGS--O3}"
186    SFLAGS="${CFLAGS--O3} -fPIC"
187    if test "$ARCHS"; then
188      CFLAGS="${CFLAGS} ${ARCHS}"
189      LDFLAGS="${LDFLAGS} ${ARCHS}"
190    fi
191    if test $build64 -eq 1; then
192      CFLAGS="${CFLAGS} -m64"
193      SFLAGS="${SFLAGS} -m64"
194    fi
195    if test "$warn" -eq 1; then
196      if test "$zconst" -eq 1; then
197        CFLAGS="${CFLAGS} -Wall -Wextra -Wcast-qual -pedantic -DZLIB_CONST"
198      else
199        CFLAGS="${CFLAGS} -Wall -Wextra -pedantic"
200      fi
201    fi
202    if test $debug -eq 1; then
203      CFLAGS="${CFLAGS} -DZLIB_DEBUG"
204      SFLAGS="${SFLAGS} -DZLIB_DEBUG"
205    fi
206    if test -z "$uname"; then
207      uname=`(uname -s || echo unknown) 2>/dev/null`
208    fi
209    case "$uname" in
210    Linux* | linux* | GNU | GNU/* | solaris*)
211          LDSHARED=${LDSHARED-"$cc -shared -Wl,-soname,libz.so.1,--version-script,${SRCDIR}zlib.map"} ;;
212    *BSD | *bsd* | DragonFly)
213          LDSHARED=${LDSHARED-"$cc -shared -Wl,-soname,libz.so.1,--version-script,${SRCDIR}zlib.map"}
214          LDCONFIG="ldconfig -m" ;;
215    CYGWIN* | Cygwin* | cygwin* | OS/2*)
216          EXE='.exe' ;;
217    MINGW* | mingw*)
218  # temporary bypass
219          rm -f $test.[co] $test $test$shared_ext
220          echo "Please use win32/Makefile.gcc instead." | tee -a configure.log
221          leave 1
222          LDSHARED=${LDSHARED-"$cc -shared"}
223          LDSHAREDLIBC=""
224          EXE='.exe' ;;
225    QNX*)  # This is for QNX6. I suppose that the QNX rule below is for QNX2,QNX4
226           # (alain.bonnefoy@icbt.com)
227                   LDSHARED=${LDSHARED-"$cc -shared -Wl,-hlibz.so.1"} ;;
228    HP-UX*)
229           LDSHARED=${LDSHARED-"$cc -shared $SFLAGS"}
230           case `(uname -m || echo unknown) 2>/dev/null` in
231           ia64)
232                   shared_ext='.so'
233                   SHAREDLIB='libz.so' ;;
234           *)
235                   shared_ext='.sl'
236                   SHAREDLIB='libz.sl' ;;
237           esac ;;
238    Darwin* | darwin*)
239               shared_ext='.dylib'
240               SHAREDLIB=libz$shared_ext
241               SHAREDLIBV=libz.$VER$shared_ext
242               SHAREDLIBM=libz.$VER1$shared_ext
243               LDSHARED=${LDSHARED-"$cc -dynamiclib -install_name $libdir/$SHAREDLIBM -compatibility_version $VER1 -current_version $VER3"}
244               if libtool -V 2>&1 | grep Apple > /dev/null; then
245                   AR="libtool"
246               else
247                   AR="/usr/bin/libtool"
248               fi
249               ARFLAGS="-o" ;;
250    *)             LDSHARED=${LDSHARED-"$cc -shared"} ;;
251    esac
252  else
253    # find system name and corresponding cc options
254    CC=${CC-cc}
255    gcc=0
256    echo ... using $CC >> configure.log
257    if test -z "$uname"; then
258      uname=`(uname -sr || echo unknown) 2>/dev/null`
259    fi
260    case "$uname" in
261    HP-UX*)    SFLAGS=${CFLAGS-"-O +z"}
262               CFLAGS=${CFLAGS-"-O"}
263  #            LDSHARED=${LDSHARED-"ld -b +vnocompatwarnings"}
264               LDSHARED=${LDSHARED-"ld -b"}
265           case `(uname -m || echo unknown) 2>/dev/null` in
266           ia64)
267               shared_ext='.so'
268               SHAREDLIB='libz.so' ;;
269           *)
270               shared_ext='.sl'
271               SHAREDLIB='libz.sl' ;;
272           esac ;;
273    IRIX*)     SFLAGS=${CFLAGS-"-ansi -O2 -rpath ."}
274               CFLAGS=${CFLAGS-"-ansi -O2"}
275               LDSHARED=${LDSHARED-"cc -shared -Wl,-soname,libz.so.1"} ;;
276    OSF1\ V4*) SFLAGS=${CFLAGS-"-O -std1"}
277               CFLAGS=${CFLAGS-"-O -std1"}
278               LDFLAGS="${LDFLAGS} -Wl,-rpath,."
279               LDSHARED=${LDSHARED-"cc -shared  -Wl,-soname,libz.so -Wl,-msym -Wl,-rpath,$(libdir) -Wl,-set_version,${VER}:1.0"} ;;
280    OSF1*)     SFLAGS=${CFLAGS-"-O -std1"}
281               CFLAGS=${CFLAGS-"-O -std1"}
282               LDSHARED=${LDSHARED-"cc -shared -Wl,-soname,libz.so.1"} ;;
283    QNX*)      SFLAGS=${CFLAGS-"-4 -O"}
284               CFLAGS=${CFLAGS-"-4 -O"}
285               LDSHARED=${LDSHARED-"cc"}
286               RANLIB=${RANLIB-"true"}
287               AR="cc"
288               ARFLAGS="-A" ;;
289    SCO_SV\ 3.2*) SFLAGS=${CFLAGS-"-O3 -dy -KPIC "}
290               CFLAGS=${CFLAGS-"-O3"}
291               LDSHARED=${LDSHARED-"cc -dy -KPIC -G"} ;;
292    SunOS\ 5* | solaris*)
293           LDSHARED=${LDSHARED-"cc -G -h libz$shared_ext.$VER1"}
294           SFLAGS=${CFLAGS-"-fast -KPIC"}
295           CFLAGS=${CFLAGS-"-fast"}
296           if test $build64 -eq 1; then
297               # old versions of SunPRO/Workshop/Studio don't support -m64,
298               # but newer ones do.  Check for it.
299               flag64=`$CC -flags | egrep -- '^-m64'`
300               if test x"$flag64" != x"" ; then
301                   CFLAGS="${CFLAGS} -m64"
302                   SFLAGS="${SFLAGS} -m64"
303               else
304                   case `(uname -m || echo unknown) 2>/dev/null` in
305                     i86*)
306                       SFLAGS="$SFLAGS -xarch=amd64"
307                       CFLAGS="$CFLAGS -xarch=amd64" ;;
308                     *)
309                       SFLAGS="$SFLAGS -xarch=v9"
310                       CFLAGS="$CFLAGS -xarch=v9" ;;
311                   esac
312               fi
313           fi
314           if test -n "$ZINC"; then
315               ZINC='-I- -I. -I$(SRCDIR)'
316           fi
317           ;;
318    SunOS\ 4*) SFLAGS=${CFLAGS-"-O2 -PIC"}
319               CFLAGS=${CFLAGS-"-O2"}
320               LDSHARED=${LDSHARED-"ld"} ;;
321    SunStudio\ 9*) SFLAGS=${CFLAGS-"-fast -xcode=pic32 -xtarget=ultra3 -xarch=v9b"}
322               CFLAGS=${CFLAGS-"-fast -xtarget=ultra3 -xarch=v9b"}
323               LDSHARED=${LDSHARED-"cc -xarch=v9b"} ;;
324    UNIX_System_V\ 4.2.0)
325               SFLAGS=${CFLAGS-"-KPIC -O"}
326               CFLAGS=${CFLAGS-"-O"}
327               LDSHARED=${LDSHARED-"cc -G"} ;;
328    UNIX_SV\ 4.2MP)
329               SFLAGS=${CFLAGS-"-Kconform_pic -O"}
330               CFLAGS=${CFLAGS-"-O"}
331               LDSHARED=${LDSHARED-"cc -G"} ;;
332    OpenUNIX\ 5)
333               SFLAGS=${CFLAGS-"-KPIC -O"}
334               CFLAGS=${CFLAGS-"-O"}
335               LDSHARED=${LDSHARED-"cc -G"} ;;
336    AIX*)  # Courtesy of dbakker@arrayasolutions.com
337               SFLAGS=${CFLAGS-"-O -qmaxmem=8192"}
338               CFLAGS=${CFLAGS-"-O -qmaxmem=8192"}
339               LDSHARED=${LDSHARED-"xlc -G"} ;;
340    # send working options for other systems to zlib@gzip.org
341    *)         SFLAGS=${CFLAGS-"-O"}
342               CFLAGS=${CFLAGS-"-O"}
343               LDSHARED=${LDSHARED-"cc -shared"} ;;
344    esac
345  fi
346  
347  # destination names for shared library if not defined above
348  SHAREDLIB=${SHAREDLIB-"libz$shared_ext"}
349  SHAREDLIBV=${SHAREDLIBV-"libz$shared_ext.$VER"}
350  SHAREDLIBM=${SHAREDLIBM-"libz$shared_ext.$VER1"}
351  
352  echo >> configure.log
353  
354  # define functions for testing compiler and library characteristics and logging the results
355  
356  cat > $test.c <<EOF
357  #error error
358  EOF
359  if ($CC -c $CFLAGS $test.c) 2>/dev/null; then
360    try()
361    {
362      show $*
363      test "`( $* ) 2>&1 | tee -a configure.log`" = ""
364    }
365    echo - using any output from compiler to indicate an error >> configure.log
366  else
367    try()
368    {
369      show $*
370      ( $* ) >> configure.log 2>&1
371      ret=$?
372      if test $ret -ne 0; then
373        echo "(exit code "$ret")" >> configure.log
374      fi
375      return $ret
376    }
377  fi
378  
379  tryboth()
380  {
381    show $*
382    got=`( $* ) 2>&1`
383    ret=$?
384    printf %s "$got" >> configure.log
385    if test $ret -ne 0; then
386      return $ret
387    fi
388    test "$got" = ""
389  }
390  
391  cat > $test.c << EOF
392  int foo() { return 0; }
393  EOF
394  echo "Checking for obsessive-compulsive compiler options..." >> configure.log
395  if try $CC -c $CFLAGS $test.c; then
396    :
397  else
398    echo "Compiler error reporting is too harsh for $0 (perhaps remove -Werror)." | tee -a configure.log
399    leave 1
400  fi
401  
402  echo >> configure.log
403  
404  # see if shared library build supported
405  cat > $test.c <<EOF
406  extern int getchar();
407  int hello() {return getchar();}
408  EOF
409  if test $shared -eq 1; then
410    echo Checking for shared library support... | tee -a configure.log
411    # we must test in two steps (cc then ld), required at least on SunOS 4.x
412    if try $CC -w -c $SFLAGS $test.c &&
413       try $LDSHARED $SFLAGS -o $test$shared_ext $test.o; then
414      echo Building shared library $SHAREDLIBV with $CC. | tee -a configure.log
415    elif test -z "$old_cc" -a -z "$old_cflags"; then
416      echo No shared library support. | tee -a configure.log
417      shared=0;
418    else
419      echo 'No shared library support; try without defining CC and CFLAGS' | tee -a configure.log
420      shared=0;
421    fi
422  fi
423  if test $shared -eq 0; then
424    LDSHARED="$CC"
425    ALL="static"
426    TEST="all teststatic"
427    SHAREDLIB=""
428    SHAREDLIBV=""
429    SHAREDLIBM=""
430    echo Building static library $STATICLIB version $VER with $CC. | tee -a configure.log
431  else
432    ALL="static shared"
433    TEST="all teststatic testshared"
434  fi
435  
436  # check for underscores in external names for use by assembler code
437  CPP=${CPP-"$CC -E"}
438  case $CFLAGS in
439    *ASMV*)
440      echo >> configure.log
441      show "$NM $test.o | grep _hello"
442      if test "`$NM $test.o | grep _hello | tee -a configure.log`" = ""; then
443        CPP="$CPP -DNO_UNDERLINE"
444        echo Checking for underline in external names... No. | tee -a configure.log
445      else
446        echo Checking for underline in external names... Yes. | tee -a configure.log
447      fi ;;
448  esac
449  
450  echo >> configure.log
451  
452  # check for size_t
453  cat > $test.c <<EOF
454  #include <stdio.h>
455  #include <stdlib.h>
456  size_t dummy = 0;
457  EOF
458  if try $CC -c $CFLAGS $test.c; then
459    echo "Checking for size_t... Yes." | tee -a configure.log
460    need_sizet=0
461  else
462    echo "Checking for size_t... No." | tee -a configure.log
463    need_sizet=1
464  fi
465  
466  echo >> configure.log
467  
468  # find the size_t integer type, if needed
469  if test $need_sizet -eq 1; then
470    cat > $test.c <<EOF
471  long long dummy = 0;
472  EOF
473    if try $CC -c $CFLAGS $test.c; then
474      echo "Checking for long long... Yes." | tee -a configure.log
475      cat > $test.c <<EOF
476  #include <stdio.h>
477  int main(void) {
478      if (sizeof(void *) <= sizeof(int)) puts("int");
479      else if (sizeof(void *) <= sizeof(long)) puts("long");
480      else puts("z_longlong");
481      return 0;
482  }
483  EOF
484    else
485      echo "Checking for long long... No." | tee -a configure.log
486      cat > $test.c <<EOF
487  #include <stdio.h>
488  int main(void) {
489      if (sizeof(void *) <= sizeof(int)) puts("int");
490      else puts("long");
491      return 0;
492  }
493  EOF
494    fi
495    if try $CC $CFLAGS -o $test $test.c; then
496      sizet=`./$test`
497      echo "Checking for a pointer-size integer type..." $sizet"." | tee -a configure.log
498    else
499      echo "Failed to find a pointer-size integer type." | tee -a configure.log
500      leave 1
501    fi
502  fi
503  
504  if test $need_sizet -eq 1; then
505    CFLAGS="${CFLAGS} -DNO_SIZE_T=${sizet}"
506    SFLAGS="${SFLAGS} -DNO_SIZE_T=${sizet}"
507  fi
508  
509  echo >> configure.log
510  
511  # check for large file support, and if none, check for fseeko()
512  cat > $test.c <<EOF
513  #include <sys/types.h>
514  off64_t dummy = 0;
515  EOF
516  if try $CC -c $CFLAGS -D_LARGEFILE64_SOURCE=1 $test.c; then
517    CFLAGS="${CFLAGS} -D_LARGEFILE64_SOURCE=1"
518    SFLAGS="${SFLAGS} -D_LARGEFILE64_SOURCE=1"
519    ALL="${ALL} all64"
520    TEST="${TEST} test64"
521    echo "Checking for off64_t... Yes." | tee -a configure.log
522    echo "Checking for fseeko... Yes." | tee -a configure.log
523  else
524    echo "Checking for off64_t... No." | tee -a configure.log
525    echo >> configure.log
526    cat > $test.c <<EOF
527  #include <stdio.h>
528  int main(void) {
529    fseeko(NULL, 0, 0);
530    return 0;
531  }
532  EOF
533    if try $CC $CFLAGS -o $test $test.c; then
534      echo "Checking for fseeko... Yes." | tee -a configure.log
535    else
536      CFLAGS="${CFLAGS} -DNO_FSEEKO"
537      SFLAGS="${SFLAGS} -DNO_FSEEKO"
538      echo "Checking for fseeko... No." | tee -a configure.log
539    fi
540  fi
541  
542  echo >> configure.log
543  
544  # check for strerror() for use by gz* functions
545  cat > $test.c <<EOF
546  #include <string.h>
547  #include <errno.h>
548  int main() { return strlen(strerror(errno)); }
549  EOF
550  if try $CC $CFLAGS -o $test $test.c; then
551    echo "Checking for strerror... Yes." | tee -a configure.log
552  else
553    CFLAGS="${CFLAGS} -DNO_STRERROR"
554    SFLAGS="${SFLAGS} -DNO_STRERROR"
555    echo "Checking for strerror... No." | tee -a configure.log
556  fi
557  
558  # copy clean zconf.h for subsequent edits
559  cp -p ${SRCDIR}zconf.h.in zconf.h
560  
561  echo >> configure.log
562  
563  # check for unistd.h and save result in zconf.h
564  cat > $test.c <<EOF
565  #include <unistd.h>
566  int main() { return 0; }
567  EOF
568  if try $CC -c $CFLAGS $test.c; then
569    sed < zconf.h "/^#ifdef HAVE_UNISTD_H.* may be/s/def HAVE_UNISTD_H\(.*\) may be/ 1\1 was/" > zconf.temp.h
570    mv zconf.temp.h zconf.h
571    echo "Checking for unistd.h... Yes." | tee -a configure.log
572  else
573    echo "Checking for unistd.h... No." | tee -a configure.log
574  fi
575  
576  echo >> configure.log
577  
578  # check for stdarg.h and save result in zconf.h
579  cat > $test.c <<EOF
580  #include <stdarg.h>
581  int main() { return 0; }
582  EOF
583  if try $CC -c $CFLAGS $test.c; then
584    sed < zconf.h "/^#ifdef HAVE_STDARG_H.* may be/s/def HAVE_STDARG_H\(.*\) may be/ 1\1 was/" > zconf.temp.h
585    mv zconf.temp.h zconf.h
586    echo "Checking for stdarg.h... Yes." | tee -a configure.log
587  else
588    echo "Checking for stdarg.h... No." | tee -a configure.log
589  fi
590  
591  # if the z_ prefix was requested, save that in zconf.h
592  if test $zprefix -eq 1; then
593    sed < zconf.h "/#ifdef Z_PREFIX.* may be/s/def Z_PREFIX\(.*\) may be/ 1\1 was/" > zconf.temp.h
594    mv zconf.temp.h zconf.h
595    echo >> configure.log
596    echo "Using z_ prefix on all symbols." | tee -a configure.log
597  fi
598  
599  # if --solo compilation was requested, save that in zconf.h and remove gz stuff from object lists
600  if test $solo -eq 1; then
601    sed '/#define ZCONF_H/a\
602  #define Z_SOLO
603  
604  ' < zconf.h > zconf.temp.h
605    mv zconf.temp.h zconf.h
606  OBJC='$(OBJZ)'
607  PIC_OBJC='$(PIC_OBJZ)'
608  fi
609  
610  # if code coverage testing was requested, use older gcc if defined, e.g. "gcc-4.2" on Mac OS X
611  if test $cover -eq 1; then
612    CFLAGS="${CFLAGS} -fprofile-arcs -ftest-coverage"
613    if test -n "$GCC_CLASSIC"; then
614      CC=$GCC_CLASSIC
615    fi
616  fi
617  
618  echo >> configure.log
619  
620  # conduct a series of tests to resolve eight possible cases of using "vs" or "s" printf functions
621  # (using stdarg or not), with or without "n" (proving size of buffer), and with or without a
622  # return value.  The most secure result is vsnprintf() with a return value.  snprintf() with a
623  # return value is secure as well, but then gzprintf() will be limited to 20 arguments.
624  cat > $test.c <<EOF
625  #include <stdio.h>
626  #include <stdarg.h>
627  #include "zconf.h"
628  int main()
629  {
630  #ifndef STDC
631    choke me
632  #endif
633    return 0;
634  }
635  EOF
636  if try $CC -c $CFLAGS $test.c; then
637    echo "Checking whether to use vs[n]printf() or s[n]printf()... using vs[n]printf()." | tee -a configure.log
638  
639    echo >> configure.log
640    cat > $test.c <<EOF
641  #include <stdio.h>
642  #include <stdarg.h>
643  int mytest(const char *fmt, ...)
644  {
645    char buf[20];
646    va_list ap;
647    va_start(ap, fmt);
648    vsnprintf(buf, sizeof(buf), fmt, ap);
649    va_end(ap);
650    return 0;
651  }
652  int main()
653  {
654    return (mytest("Hello%d\n", 1));
655  }
656  EOF
657    if try $CC $CFLAGS -o $test $test.c; then
658      echo "Checking for vsnprintf() in stdio.h... Yes." | tee -a configure.log
659  
660      echo >> configure.log
661      cat >$test.c <<EOF
662  #include <stdio.h>
663  #include <stdarg.h>
664  int mytest(const char *fmt, ...)
665  {
666    int n;
667    char buf[20];
668    va_list ap;
669    va_start(ap, fmt);
670    n = vsnprintf(buf, sizeof(buf), fmt, ap);
671    va_end(ap);
672    return n;
673  }
674  int main()
675  {
676    return (mytest("Hello%d\n", 1));
677  }
678  EOF
679  
680      if try $CC -c $CFLAGS $test.c; then
681        echo "Checking for return value of vsnprintf()... Yes." | tee -a configure.log
682      else
683        CFLAGS="$CFLAGS -DHAS_vsnprintf_void"
684        SFLAGS="$SFLAGS -DHAS_vsnprintf_void"
685        echo "Checking for return value of vsnprintf()... No." | tee -a configure.log
686        echo "  WARNING: apparently vsnprintf() does not return a value. zlib" | tee -a configure.log
687        echo "  can build but will be open to possible string-format security" | tee -a configure.log
688        echo "  vulnerabilities." | tee -a configure.log
689      fi
690    else
691      CFLAGS="$CFLAGS -DNO_vsnprintf"
692      SFLAGS="$SFLAGS -DNO_vsnprintf"
693      echo "Checking for vsnprintf() in stdio.h... No." | tee -a configure.log
694      echo "  WARNING: vsnprintf() not found, falling back to vsprintf(). zlib" | tee -a configure.log
695      echo "  can build but will be open to possible buffer-overflow security" | tee -a configure.log
696      echo "  vulnerabilities." | tee -a configure.log
697  
698      echo >> configure.log
699      cat >$test.c <<EOF
700  #include <stdio.h>
701  #include <stdarg.h>
702  int mytest(const char *fmt, ...)
703  {
704    int n;
705    char buf[20];
706    va_list ap;
707    va_start(ap, fmt);
708    n = vsprintf(buf, fmt, ap);
709    va_end(ap);
710    return n;
711  }
712  int main()
713  {
714    return (mytest("Hello%d\n", 1));
715  }
716  EOF
717  
718      if try $CC -c $CFLAGS $test.c; then
719        echo "Checking for return value of vsprintf()... Yes." | tee -a configure.log
720      else
721        CFLAGS="$CFLAGS -DHAS_vsprintf_void"
722        SFLAGS="$SFLAGS -DHAS_vsprintf_void"
723        echo "Checking for return value of vsprintf()... No." | tee -a configure.log
724        echo "  WARNING: apparently vsprintf() does not return a value. zlib" | tee -a configure.log
725        echo "  can build but will be open to possible string-format security" | tee -a configure.log
726        echo "  vulnerabilities." | tee -a configure.log
727      fi
728    fi
729  else
730    echo "Checking whether to use vs[n]printf() or s[n]printf()... using s[n]printf()." | tee -a configure.log
731  
732    echo >> configure.log
733    cat >$test.c <<EOF
734  #include <stdio.h>
735  int mytest()
736  {
737    char buf[20];
738    snprintf(buf, sizeof(buf), "%s", "foo");
739    return 0;
740  }
741  int main()
742  {
743    return (mytest());
744  }
745  EOF
746  
747    if try $CC $CFLAGS -o $test $test.c; then
748      echo "Checking for snprintf() in stdio.h... Yes." | tee -a configure.log
749  
750      echo >> configure.log
751      cat >$test.c <<EOF
752  #include <stdio.h>
753  int mytest()
754  {
755    char buf[20];
756    return snprintf(buf, sizeof(buf), "%s", "foo");
757  }
758  int main()
759  {
760    return (mytest());
761  }
762  EOF
763  
764      if try $CC -c $CFLAGS $test.c; then
765        echo "Checking for return value of snprintf()... Yes." | tee -a configure.log
766      else
767        CFLAGS="$CFLAGS -DHAS_snprintf_void"
768        SFLAGS="$SFLAGS -DHAS_snprintf_void"
769        echo "Checking for return value of snprintf()... No." | tee -a configure.log
770        echo "  WARNING: apparently snprintf() does not return a value. zlib" | tee -a configure.log
771        echo "  can build but will be open to possible string-format security" | tee -a configure.log
772        echo "  vulnerabilities." | tee -a configure.log
773      fi
774    else
775      CFLAGS="$CFLAGS -DNO_snprintf"
776      SFLAGS="$SFLAGS -DNO_snprintf"
777      echo "Checking for snprintf() in stdio.h... No." | tee -a configure.log
778      echo "  WARNING: snprintf() not found, falling back to sprintf(). zlib" | tee -a configure.log
779      echo "  can build but will be open to possible buffer-overflow security" | tee -a configure.log
780      echo "  vulnerabilities." | tee -a configure.log
781  
782      echo >> configure.log
783      cat >$test.c <<EOF
784  #include <stdio.h>
785  int mytest()
786  {
787    char buf[20];
788    return sprintf(buf, "%s", "foo");
789  }
790  int main()
791  {
792    return (mytest());
793  }
794  EOF
795  
796      if try $CC -c $CFLAGS $test.c; then
797        echo "Checking for return value of sprintf()... Yes." | tee -a configure.log
798      else
799        CFLAGS="$CFLAGS -DHAS_sprintf_void"
800        SFLAGS="$SFLAGS -DHAS_sprintf_void"
801        echo "Checking for return value of sprintf()... No." | tee -a configure.log
802        echo "  WARNING: apparently sprintf() does not return a value. zlib" | tee -a configure.log
803        echo "  can build but will be open to possible string-format security" | tee -a configure.log
804        echo "  vulnerabilities." | tee -a configure.log
805      fi
806    fi
807  fi
808  
809  # see if we can hide zlib internal symbols that are linked between separate source files
810  if test "$gcc" -eq 1; then
811    echo >> configure.log
812    cat > $test.c <<EOF
813  #define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
814  int ZLIB_INTERNAL foo;
815  int main()
816  {
817    return 0;
818  }
819  EOF
820    if tryboth $CC -c $CFLAGS $test.c; then
821      CFLAGS="$CFLAGS -DHAVE_HIDDEN"
822      SFLAGS="$SFLAGS -DHAVE_HIDDEN"
823      echo "Checking for attribute(visibility) support... Yes." | tee -a configure.log
824    else
825      echo "Checking for attribute(visibility) support... No." | tee -a configure.log
826    fi
827  fi
828  
829  # show the results in the log
830  echo >> configure.log
831  echo ALL = $ALL >> configure.log
832  echo AR = $AR >> configure.log
833  echo ARFLAGS = $ARFLAGS >> configure.log
834  echo CC = $CC >> configure.log
835  echo CFLAGS = $CFLAGS >> configure.log
836  echo CPP = $CPP >> configure.log
837  echo EXE = $EXE >> configure.log
838  echo LDCONFIG = $LDCONFIG >> configure.log
839  echo LDFLAGS = $LDFLAGS >> configure.log
840  echo LDSHARED = $LDSHARED >> configure.log
841  echo LDSHAREDLIBC = $LDSHAREDLIBC >> configure.log
842  echo OBJC = $OBJC >> configure.log
843  echo PIC_OBJC = $PIC_OBJC >> configure.log
844  echo RANLIB = $RANLIB >> configure.log
845  echo SFLAGS = $SFLAGS >> configure.log
846  echo SHAREDLIB = $SHAREDLIB >> configure.log
847  echo SHAREDLIBM = $SHAREDLIBM >> configure.log
848  echo SHAREDLIBV = $SHAREDLIBV >> configure.log
849  echo STATICLIB = $STATICLIB >> configure.log
850  echo TEST = $TEST >> configure.log
851  echo VER = $VER >> configure.log
852  echo Z_U4 = $Z_U4 >> configure.log
853  echo SRCDIR = $SRCDIR >> configure.log
854  echo exec_prefix = $exec_prefix >> configure.log
855  echo includedir = $includedir >> configure.log
856  echo libdir = $libdir >> configure.log
857  echo mandir = $mandir >> configure.log
858  echo prefix = $prefix >> configure.log
859  echo sharedlibdir = $sharedlibdir >> configure.log
860  echo uname = $uname >> configure.log
861  
862  # udpate Makefile with the configure results
863  sed < ${SRCDIR}Makefile.in "
864  /^CC *=/s#=.*#=$CC#
865  /^CFLAGS *=/s#=.*#=$CFLAGS#
866  /^SFLAGS *=/s#=.*#=$SFLAGS#
867  /^LDFLAGS *=/s#=.*#=$LDFLAGS#
868  /^LDSHARED *=/s#=.*#=$LDSHARED#
869  /^CPP *=/s#=.*#=$CPP#
870  /^STATICLIB *=/s#=.*#=$STATICLIB#
871  /^SHAREDLIB *=/s#=.*#=$SHAREDLIB#
872  /^SHAREDLIBV *=/s#=.*#=$SHAREDLIBV#
873  /^SHAREDLIBM *=/s#=.*#=$SHAREDLIBM#
874  /^AR *=/s#=.*#=$AR#
875  /^ARFLAGS *=/s#=.*#=$ARFLAGS#
876  /^RANLIB *=/s#=.*#=$RANLIB#
877  /^LDCONFIG *=/s#=.*#=$LDCONFIG#
878  /^LDSHAREDLIBC *=/s#=.*#=$LDSHAREDLIBC#
879  /^EXE *=/s#=.*#=$EXE#
880  /^SRCDIR *=/s#=.*#=$SRCDIR#
881  /^ZINC *=/s#=.*#=$ZINC#
882  /^ZINCOUT *=/s#=.*#=$ZINCOUT#
883  /^prefix *=/s#=.*#=$prefix#
884  /^exec_prefix *=/s#=.*#=$exec_prefix#
885  /^libdir *=/s#=.*#=$libdir#
886  /^sharedlibdir *=/s#=.*#=$sharedlibdir#
887  /^includedir *=/s#=.*#=$includedir#
888  /^mandir *=/s#=.*#=$mandir#
889  /^OBJC *=/s#=.*#= $OBJC#
890  /^PIC_OBJC *=/s#=.*#= $PIC_OBJC#
891  /^all: */s#:.*#: $ALL#
892  /^test: */s#:.*#: $TEST#
893  " > Makefile
894  
895  # create zlib.pc with the configure results
896  sed < ${SRCDIR}zlib.pc.in "
897  /^CC *=/s#=.*#=$CC#
898  /^CFLAGS *=/s#=.*#=$CFLAGS#
899  /^CPP *=/s#=.*#=$CPP#
900  /^LDSHARED *=/s#=.*#=$LDSHARED#
901  /^STATICLIB *=/s#=.*#=$STATICLIB#
902  /^SHAREDLIB *=/s#=.*#=$SHAREDLIB#
903  /^SHAREDLIBV *=/s#=.*#=$SHAREDLIBV#
904  /^SHAREDLIBM *=/s#=.*#=$SHAREDLIBM#
905  /^AR *=/s#=.*#=$AR#
906  /^ARFLAGS *=/s#=.*#=$ARFLAGS#
907  /^RANLIB *=/s#=.*#=$RANLIB#
908  /^EXE *=/s#=.*#=$EXE#
909  /^prefix *=/s#=.*#=$prefix#
910  /^exec_prefix *=/s#=.*#=$exec_prefix#
911  /^libdir *=/s#=.*#=$libdir#
912  /^sharedlibdir *=/s#=.*#=$sharedlibdir#
913  /^includedir *=/s#=.*#=$includedir#
914  /^mandir *=/s#=.*#=$mandir#
915  /^LDFLAGS *=/s#=.*#=$LDFLAGS#
916  " | sed -e "
917  s/\@VERSION\@/$VER/g;
918  " > zlib.pc
919  
920  # done
921  leave 0