File: configure.in

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dnl Process this file with autoconf to produce a configure script for gzip
dnl
dnl Same as AC_RETSIGTYPE, but use a void default.
dnl
define(AC_RETSIGTYP,
[AC_COMPILE_CHECK([return type of signal handlers],
[#include <sys/types.h>
#include <signal.h>
#ifdef signal
#undef signal
#endif
extern void (*signal ()) ();],
[int i;],
[],
[AC_DEFINE(RETSIGTYPE, int)],
)]
)dnl
dnl
dnl End of local macros
dnl
AC_INIT(gzip.c)
AC_PROG_CC
AC_PROG_CPP
dnl
dnl Try to assemble match.S with and without leading underline.
dnl cc -E produces incorrect asm files on SVR4, we must use /lib/cpp.
dnl Also, "gcc -E match.s" ignores -E, so we must use match.S.
echo checking for underline in external names
test -z "$ASCPP" -a -f /lib/cpp && ASCPP=/lib/cpp
test -z "$ASCPP" && ASCPP="$CC -E"
cat > conftest.c <<EOF
int foo() {return 0;}
EOF
eval "$CC -c conftest.c > /dev/null 2>&1"
if nm conftest.o | grep _foo > /dev/null 2>&1 ; then
  :
else
  ASCPP="${ASCPP} -DNO_UNDERLINE"
fi
rm -f _match.o conftest.c conftest.o
if echo "$DEFS" | grep NO_ASM >/dev/null; then
  :
else
  echo checking for assembler
  OBJA=""
  if eval "$ASCPP $srcdir/match.S > _match.s 2>/dev/null"; then
    if test ! -s _match.s || grep error < _match.s > /dev/null; then
      :
    elif eval "$CC -c _match.s >/dev/null 2>&1" && test -f _match.o; then
      DEFS="${DEFS} -DASMV"
      OBJA=match.o
    fi
  fi
  rm -f _match.s _match.o
fi
dnl
AC_PROG_INSTALL
AC_AIX
AC_MINIX
AC_ISC_POSIX
AC_DYNIX_SEQ
AC_STDC_HEADERS
dnl if STDC_HEADERS can't be defined, look for special files:
AC_HEADER_CHECK(string.h, ,AC_DEFINE(NO_STRING_H))
AC_HEADER_CHECK(stdlib.h, ,AC_DEFINE(NO_STDLIB_H))
AC_HEADER_CHECK(memory.h, ,AC_DEFINE(NO_MEMORY_H))
AC_HEADER_CHECK(fcntl.h,  ,AC_DEFINE(NO_FCNTL_H))
AC_HEADER_CHECK(time.h,   ,AC_DEFINE(NO_TIME_H))
AC_HAVE_HEADERS(unistd.h)
utime=0
AC_HEADER_CHECK(utime.h, utime=1 ,AC_DEFINE(NO_UTIME_H))
if test $utime -eq 0; then
  AC_HAVE_HEADERS(sys/utime.h)
fi
AC_DIR_HEADER
AC_XENIX_DIR
AC_RETSIGTYP
AC_SIZE_T
AC_HEADER_EGREP(off_t, sys/types.h, ,AC_DEFINE(NO_OFF_T))
AC_HAVE_POUNDBANG([SEDCMD="1d"], [SEDCMD=""])
AC_PREFIX(gzip)
if test -z "$G" -a -n "$prefix" -a -f $prefix/bin/gznew; then
  G=g
fi
if test -z "$ZCAT"; then
  if test -n "$prefix" -a -f $prefix/bin/gzcat; then
    ZCAT=gzcat
  else
    ZCAT=${G}zcat
  fi
fi
AC_SUBST(ZCAT)dnl
AC_SUBST(G)dnl
AC_SUBST(CFLAGS)dnl
AC_SUBST(ASCPP)dnl
AC_SUBST(OBJA)dnl
AC_SUBST(SEDCMD)dnl
AC_OUTPUT(Makefile)