#!/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 $SRCDIR = "."; then
ZINC=""
ZINCOUT="-I."
SRCDIR="" else
ZINC='-include zconf.h'
ZINCOUT='-I. -I$(SRCDIR)'
SRCDIR="$SRCDIR/" fi
# set command prefix for cross-compilation if [ -n "${CHOST}" ]; then
uname=${CHOST}
mname=${CHOST}
CROSS_PREFIX="${CHOST}-" else
mname=`(uname -a || echo unknown) 2>/dev/null` fi
# destination name for static library
STATICLIB=libz.a
# establish commands for library building if"${CROSS_PREFIX}ar" --version >/dev/null 2>/dev/null || test $? -lt 126; then
AR=${AR-"${CROSS_PREFIX}ar"}
test -n "${CROSS_PREFIX}" && echo Using ${AR} | tee -a configure.log else
AR=${AR-"ar"}
test -n "${CROSS_PREFIX}" && echo Using ${AR} | tee -a configure.log fi
ARFLAGS=${ARFLAGS-"rc"} if"${CROSS_PREFIX}ranlib" --version >/dev/null 2>/dev/null || test $? -lt 126; then
RANLIB=${RANLIB-"${CROSS_PREFIX}ranlib"}
test -n "${CROSS_PREFIX}" && echo Using ${RANLIB} | tee -a configure.log else
RANLIB=${RANLIB-"ranlib"} fi if"${CROSS_PREFIX}nm" --version >/dev/null 2>/dev/null || test $? -lt 126; then
NM=${NM-"${CROSS_PREFIX}nm"}
test -n "${CROSS_PREFIX}" && echo Using ${NM} | tee -a configure.log else
NM=${NM-"nm"} fi
# 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 ;;
*) 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 $VER"} if"${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 -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
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"); elseif (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
# 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
# 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
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
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
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
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
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