1#!/bin/sh
2# configure script for zlib. This script is needed only if
3# you wish to build a shared library and your system supports them,
4# of if you need special compiler, flags or install directory.
5# Otherwise, you can just use directly "make test; make install"
6#
7# To create a shared library, use "configure --shared"; by default a static
8# library is created. If the primitive shared library support provided here
9# does not work, use ftp://prep.ai.mit.edu/pub/gnu/libtool-*.tar.gz
10#
11# To impose specific compiler or flags or install directory, use for example:
12#    prefix=$HOME CC=cc CFLAGS="-O4" ./configure
13# or for csh/tcsh users:
14#    (setenv prefix $HOME; setenv CC cc; setenv CFLAGS "-O4"; ./configure)
15# LDSHARED is the command to be used to create a shared library
16
17# Incorrect settings of CC or CFLAGS may prevent creating a shared library.
18# If you have problems, try without defining CC and CFLAGS before reporting
19# an error.
20
21LIBS=libz.a
22SHAREDLIB=libz.so
23VER=`sed -n -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`
24AR=${AR-"ar rc"}
25RANLIB=${RANLIB-"ranlib"}
26prefix=${prefix-/usr/local}
27exec_prefix=${exec_prefix-'${prefix}'}
28libdir=${libdir-'${exec_prefix}/lib'}
29includedir=${includedir-'${prefix}/include'}
30shared_ext='.so'
31shared=0
32gcc=0
33old_cc="$CC"
34old_cflags="$CFLAGS"
35
36while test $# -ge 1
37do
38case "$1" in
39    -h* | --h*)
40      echo 'usage:'
41      echo '  configure [--shared] [--prefix=PREFIX]  [--exec_prefix=EXPREFIX]'
42      echo '     [--libdir=LIBDIR] [--includedir=INCLUDEDIR]'
43        exit 0;;
44    -p*=* | --p*=*) prefix=`echo $1 | sed 's/[-a-z_]*=//'`; shift;;
45    -e*=* | --e*=*) exec_prefix=`echo $1 | sed 's/[-a-z_]*=//'`; shift;;
46    -l*=* | --libdir=*) libdir=`echo $1 | sed 's/[-a-z_]*=//'`; shift;;
47    -i*=* | --includedir=*) includedir=`echo $1 | sed 's/[-a-z_]*=//'`;shift;;
48    -p* | --p*) prefix="$2"; shift; shift;;
49    -e* | --e*) exec_prefix="$2"; shift; shift;;
50    -l* | --l*) libdir="$2"; shift; shift;;
51    -i* | --i*) includedir="$2"; shift; shift;;
52    -s* | --s*) shared=1; shift;;
53    esac
54done
55
56test=ztest$$
57cat > $test.c <<EOF
58extern int getchar();
59int hello() {return getchar();}
60EOF
61
62test -z "$CC" && echo Checking for gcc...
63cc=${CC-gcc}
64cflags=${CFLAGS-"-O3"}
65# to force the asm version use: CFLAGS="-O3 -DASMV" ./configure
66case "$cc" in
67  *gcc*) gcc=1;;
68esac
69
70if test "$gcc" -eq 1 && ($cc -c $cflags $test.c) 2>/dev/null; then
71  CC="$cc"
72  SFLAGS=${CFLAGS-"-fPIC -O3"}
73  CFLAGS="$cflags"
74  case `(uname -s || echo unknown) 2>/dev/null` in
75  Linux | linux) LDSHARED=${LDSHARED-"gcc -shared -Wl,-soname,libz.so.1"};;
76  *)             LDSHARED=${LDSHARED-"gcc -shared"};;
77  esac
78else
79  # find system name and corresponding cc options
80  CC=${CC-cc}
81  case `(uname -sr || echo unknown) 2>/dev/null` in
82  HP-UX*)    SFLAGS=${CFLAGS-"-O +z"}
83	     CFLAGS=${CFLAGS-"-O"}
84#	     LDSHARED=${LDSHARED-"ld -b +vnocompatwarnings"}
85	     LDSHARED=${LDSHARED-"ld -b"}
86	     shared_ext='.sl'
87	     SHAREDLIB='libz.sl';;
88  IRIX*)     SFLAGS=${CFLAGS-"-ansi -O2 -rpath ."}
89	     CFLAGS=${CFLAGS-"-ansi -O2"}
90	     LDSHARED=${LDSHARED-"cc -shared"};;
91  OSF1\ V4*) SFLAGS=${CFLAGS-"-O -std1"}
92	     CFLAGS=${CFLAGS-"-O -std1"}
93	     LDSHARED=${LDSHARED-"cc -shared  -Wl,-soname,$SHAREDLIB -Wl,-msym -Wl,-rpath,$(libdir) -Wl,-set_version,${VER}:1.0"};;
94  OSF1*)     SFLAGS=${CFLAGS-"-O -std1"}
95	     CFLAGS=${CFLAGS-"-O -std1"}
96	     LDSHARED=${LDSHARED-"cc -shared"};;
97  QNX*)      SFLAGS=${CFLAGS-"-4 -O"}
98             CFLAGS=${CFLAGS-"-4 -O"}
99	     LDSHARED=${LDSHARED-"cc"}
100             RANLIB=${RANLIB-"true"}
101             AR="cc -A";;
102  SCO_SV\ 3.2*) SFLAGS=${CFLAGS-"-O3 -dy -KPIC "}
103	     CFLAGS=${CFLAGS-"-O3"}
104	     LDSHARED=${LDSHARED-"cc -dy -KPIC -G"};;
105  SunOS\ 5*) SFLAGS=${CFLAGS-"-fast -xcg89 -KPIC -R."}
106             CFLAGS=${CFLAGS-"-fast -xcg89"}
107	     LDSHARED=${LDSHARED-"cc -G"};;
108  SunOS\ 4*) SFLAGS=${CFLAGS-"-O2 -PIC"}
109	     CFLAGS=${CFLAGS-"-O2"}
110	     LDSHARED=${LDSHARED-"ld"};;
111  UNIX_System_V\ 4.2.0) 
112	     SFLAGS=${CFLAGS-"-KPIC -O"}
113	     CFLAGS=${CFLAGS-"-O"}
114	     LDSHARED=${LDSHARED-"cc -G"};;
115  UNIX_SV\ 4.2MP)
116	     SFLAGS=${CFLAGS-"-Kconform_pic -O"}
117	     CFLAGS=${CFLAGS-"-O"}
118	     LDSHARED=${LDSHARED-"cc -G"};;
119  # send working options for other systems to support@gzip.org
120  *)         SFLAGS=${CFLAGS-"-O"}
121	     CFLAGS=${CFLAGS-"-O"}
122	     LDSHARED=${LDSHARED-"cc -shared"};;
123  esac
124fi
125
126if test $shared -eq 1; then
127  echo Checking for shared library support...
128  # we must test in two steps (cc then ld), required at least on SunOS 4.x
129  if test "`($CC -c $SFLAGS $test.c) 2>&1`" = "" &&
130     test "`($LDSHARED -o $test$shared_ext $test.o) 2>&1`" = ""; then
131    CFLAGS="$SFLAGS"
132    LIBS="$SHAREDLIB.$VER"
133    echo Building shared library $SHAREDLIB.$VER with $CC.
134  elif test -z "$old_cc" -a -z "$old_cflags"; then
135    echo No shared library suppport.
136    shared=0;
137  else
138    echo 'No shared library suppport; try without defining CC and CFLAGS'
139    shared=0;
140  fi
141fi
142if test $shared -eq 0; then
143  LDSHARED="$CC"
144  echo Building static library $LIBS version $VER with $CC.
145fi
146
147cat > $test.c <<EOF
148#include <unistd.h>
149int main() { return 0; }
150EOF
151if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then
152  CFLAGS="$CFLAGS -DHAVE_UNISTD_H"
153  echo "Checking for unistd.h... Yes."
154else
155  echo "Checking for unistd.h... No."
156fi
157
158cat > $test.c <<EOF
159#include <errno.h>
160int main() { return 0; }
161EOF
162if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then
163  echo "Checking for errno.h...	 Yes."
164else
165  echo "Checking for errno.h...	 No."
166  CFLAGS="$CFLAGS -DNO_ERRNO_H"
167fi
168
169cat > $test.c <<EOF
170#include <sys/types.h>
171#include <sys/mman.h>
172#include <sys/stat.h>
173caddr_t hello() {
174  return mmap((caddr_t)0, (off_t)0, PROT_READ, MAP_SHARED, 0, (off_t)0); 
175}
176EOF
177if test "`($CC -c $CFLAGS $test.c) 2>&1`" = ""; then
178  CFLAGS="$CFLAGS -DUSE_MMAP"
179  echo Checking for mmap support... Yes.
180else
181  echo Checking for mmap support... No.
182fi
183
184CPP=${CPP-"$CC -E"}
185case $CFLAGS in
186  *ASMV*)
187    if test "`nm $test.o | grep _hello`" = ""; then
188      CPP="$CPP -DNO_UNDERLINE"
189      echo Checking for underline in external names... No.
190    else
191      echo Checking for underline in external names... Yes.
192    fi;;
193esac
194
195rm -f $test.[co] $test$shared_ext
196
197# udpate Makefile
198sed < Makefile.in "
199/^CC *=/s%=.*%=$CC%
200/^CFLAGS *=/s%=.*%=$CFLAGS%
201/^CPP *=/s%=.*%=$CPP%
202/^LDSHARED *=/s%=.*%=$LDSHARED%
203/^LIBS *=/s%=.*%=$LIBS%
204/^SHAREDLIB *=/s%=.*%=$SHAREDLIB%
205/^AR *=/s%=.*%=$AR%
206/^RANLIB *=/s%=.*%=$RANLIB%
207/^VER *=/s%=.*%=$VER%
208/^prefix *=/s%=.*%=$prefix%
209/^exec_prefix *=/s%=.*%=$exec_prefix%
210/^libdir *=/s%=.*%=$libdir%
211/^includedir *=/s%=.*%=$includedir%
212" > Makefile
213