2008-07-17 Ken Werner <ken.werner@de.ibm.com>

[newlib-cygwin.git] / newlib / configure.in

dnl This is the newlib configure.in file.
dnl Process this file with autoconf to produce a configure script.

AC_PREREQ(2.59)
AC_INIT([newlib],[NEWLIB_VERSION])
AC_CONFIG_SRCDIR([libc])
AC_CONFIG_HEADER(newlib.h:newlib.hin)

dnl Can't be done in NEWLIB_CONFIGURE because that confuses automake. 
AC_CONFIG_AUX_DIR(..)

dnl Support --enable-newlib-io-pos-args
dnl This option is actually read in libc/configure.in.  It is repeated
dnl here so that it shows up in the help text.
AC_ARG_ENABLE(newlib-io-pos-args,
[  --enable-newlib-io-pos-args enable printf-family positional arg support],
[case "${enableval}" in
  yes) newlib_io_pos_args=yes ;;
  no)  newlib_io_pos_args=no ;;
  *)   AC_MSG_ERROR(bad value ${enableval} for newlib-io-pos-args option) ;;
 esac], [newlib_io_pos_args=])dnl

dnl Support --enable-newlib-io-c99-formats
AC_ARG_ENABLE(newlib-io-c99-formats,
[  --enable-newlib-io-c99-formats   enable C99 support in IO functions like printf/scanf],
[case "${enableval}" in
  yes) newlib_io_c99_formats=yes;;
  no)  newlib_io_c99_formats=no ;;
  *)   AC_MSG_ERROR(bad value ${enableval} for newlib-io-c99-formats option) ;;
 esac], [newlib_io_c99_formats=])dnl

dnl Support --enable-newlib-io-long-long
AC_ARG_ENABLE(newlib-io-long-long,
[  --enable-newlib-io-long-long   enable long long type support in IO functions like printf/scanf],
[case "${enableval}" in
  yes) newlib_io_long_long=yes;;
  no)  newlib_io_long_long=no ;;
  *)   AC_MSG_ERROR(bad value ${enableval} for newlib-io-long-long option) ;;
 esac], [newlib_io_long_long=])dnl

dnl Support --enable-newlib-io-long-double
AC_ARG_ENABLE(newlib-io-long-double,
[  --enable-newlib-io-long-double   enable long double type support in IO functions printf/scanf],
[case "${enableval}" in
  yes) newlib_io_long_double=yes;;
  no)  newlib_io_long_double=no ;;
  *)   AC_MSG_ERROR(bad value ${enableval} for newlib-io-long-double option) ;;
 esac], [newlib_io_long_double=])dnl

dnl If multibyte support is enabled, iconv should be enabled too
dnl Support --enable-newlib-mb
AC_ARG_ENABLE(newlib-mb,
[  --enable-newlib-mb        enable multibyte support],
[case "${enableval}" in
  yes) newlib_mb=yes;;
  no)  newlib_mb=no ;;
  *)   AC_MSG_ERROR(bad value ${enableval} for newlib-mb option) ;;
 esac], [newlib_mb=])dnl

dnl Support --enable-newlib-iconv-encodings
AC_ARG_ENABLE(newlib-iconv-encodings,
[  --enable-newlib-iconv-encodings   enable specific comma-separated list of bidirectional iconv encodings to be built-in],
[if test x${enableval} = x; then
   AC_MSG_ERROR(bad value ${enableval} for newlib-iconv-encodings option - use comma-separated encodings list)
 fi
 iconv_encodings=${enableval}
 ], [iconv_encodings=])dnl

dnl Support --enable-newlib-iconv-from-encodings
AC_ARG_ENABLE(newlib-iconv-from-encodings,
[  --enable-newlib-iconv-from-encodings   enable specific comma-separated list of \"from\" iconv encodings to be built-in],
[if test x${enableval} = x; then
   AC_MSG_ERROR(bad value ${enableval} for newlib-iconv-from-encodings option - use comma-separated encodings list)
 fi
 iconv_from_encodings=${enableval}
 ], [iconv_from_encodings=])dnl

dnl Support --enable-newlib-iconv-to-encodings
AC_ARG_ENABLE(newlib-iconv-to-encodings,
[  --enable-newlib-iconv-to-encodings   enable specific comma-separated list of \"to\" iconv encodings to be built-in],
[if test x${enableval} = x; then
   AC_MSG_ERROR(bad value ${enableval} for newlib-iconv-to-encodings option - use comma-separated encodings list)
 fi
 iconv_to_encodings=${enableval}
 ], [iconv_to_encodings=])dnl

dnl Support --enable-newlib-iconv-external-ccs
AC_ARG_ENABLE(newlib-iconv-external-ccs,
[  --enable-newlib-iconv-external-ccs     enable capabilities to load external CCS files for iconv],
[if test "${newlib_iconv_external_ccs+set}" != set; then
   case "${enableval}" in
     yes) newlib_iconv_external_ccs=yes ;;
     no)  newlib_iconv_external_ccs=no ;;
     *)   AC_MSG_ERROR(bad value ${enableval} for newlib-iconv-external-ccs option) ;;
   esac
 fi], [newlib_iconv_external_ccs=${newlib_iconv_external_ccs}])dnl

dnl Support --disable-newlib-atexit-dynamic-alloc
AC_ARG_ENABLE(newlib-atexit-dynamic-alloc,
[  --disable-newlib-atexit-alloc    disable dynamic allocation of atexit entries],
[if test "${newlib_atexit_dynamic_alloc+set}" != set; then
  case "${enableval}" in
    yes) newlib_atexit_dynamic_alloc=yes ;;
    no)  newlib_atexit_dynamic_alloc=no  ;;
    *)   AC_MSG_ERROR(bad value ${enableval} for newlib-atexit-dynamic-alloc option) ;;
  esac
 fi], [newlib_atexit_dynamic_alloc=${newlib_atexit_dynamic_alloc}])dnl

dnl Support --enable-newlib-reent-small
AC_ARG_ENABLE(newlib-reent-small,
[  --enable-newlib-reent-small   enable small reentrant struct support],
[case "${enableval}" in
  yes) newlib_reent_small=yes;;
  no)  newlib_reent_small=no ;;
  *)   AC_MSG_ERROR(bad value ${enableval} for newlib-reent-small option) ;;
 esac], [newlib_reent_small=])dnl

NEWLIB_CONFIGURE(.)

dnl We have to enable libtool after NEWLIB_CONFIGURE because if we try and
dnl add it into NEWLIB_CONFIGURE, executable tests are made before the first
dnl line of the macro which fail because appropriate LDFLAGS are not set.
_LT_DECL_SED
AC_PROG_AWK
if test "${use_libtool}" = "yes"; then
AC_LIBTOOL_WIN32_DLL
AM_PROG_LIBTOOL
fi

AC_ARG_ENABLE(newlib_hw_fp,
[  --enable-newlib-hw-fp    Turn on hardware floating point math],
[case "${enableval}" in
   yes) newlib_hw_fp=true ;;
   no)  newlib_hw_fp=false ;;
   *) AC_MSG_ERROR(bad value ${enableval} for --enable-newlib-hw-fp) ;;
 esac],[newlib_hw_fp=false])
AM_CONDITIONAL(NEWLIB_HW_FP, test x$newlib_hw_fp = xtrue)

# These get added in the top-level configure.in, except in the case where
# newlib is being built natively.
LIBC_INCLUDE_GREP=`echo ${CC} | grep \/libc\/include`
abs_newlib_basedir=`cd ${newlib_basedir} && pwd`
if test -z "${LIBC_INCLUDE_GREP}"; then
  CC_FOR_NEWLIB="${CC} -I$PWD/targ-include -I${abs_newlib_basedir}/libc/include"
else
  CC_FOR_NEWLIB="${CC}"
fi
AC_SUBST(CC_FOR_NEWLIB)

AC_CONFIG_SUBDIRS(libc)
AC_CONFIG_SUBDIRS(libm)

if test -z "${with_multisubdir}"; then
  AC_CONFIG_SUBDIRS(doc)
  have_doc=yes
else
  have_doc=
fi
AM_CONDITIONAL(HAVE_DOC, test x$have_doc = xyes)

EXTRA_DIRS=
case $host in
  i[[34567]]86-pc-linux-*)
  	AC_CONFIG_SUBDIRS(iconvdata)
	EXTRA_DIRS=iconvdata
	;;
esac
AC_SUBST(EXTRA_DIRS)

CRT0=
CRT0_DIR=
if test "x${have_crt0}" = "xyes"; then
  CRT0=crt0.o
  CRT0_DIR=libc/
fi
AC_SUBST(CRT0)
AC_SUBST(CRT0_DIR)

CRT1=${crt1}
CRT1_DIR=
if test -n "${crt1_dir}"; then
  CRT1_DIR=${crt1_dir}/
fi
AC_SUBST(CRT1)
AC_SUBST(CRT1_DIR)

if test -n "${libm_machine_dir}"; then
  LIBM_MACHINE_OBJECTLIST=libm/machine/${libm_machine_dir}/objectlist.awk.in
fi
AC_SUBST(LIBM_MACHINE_OBJECTLIST)

if test -n "${machine_dir}"; then
  MACHINE_OBJECTLIST=libc/machine/${machine_dir}/objectlist.awk.in
fi
AC_SUBST(MACHINE_OBJECTLIST)

if test -n "${sys_dir}"; then
  SYS_OBJECTLIST=libc/sys/${sys_dir}/objectlist.awk.in
fi
AC_SUBST(SYS_OBJECTLIST)

if test "${have_sys_mach_dir}" = "yes"; then
  SYS_MACH_OBJECTLIST=libc/sys/${sys_dir}/machine/${machine_dir}/objectlist.awk.in
fi
AC_SUBST(SYS_MACH_OBJECTLIST)

if test -n "${posix_dir}"; then
  POSIX_OBJECTLIST=libc/${posix_dir}/objectlist.awk.in
fi
AC_SUBST(POSIX_OBJECTLIST)

if test -n "${signal_dir}"; then
  SIGNAL_OBJECTLIST=libc/${signal_dir}/objectlist.awk.in
fi
AC_SUBST(SIGNAL_OBJECTLIST)

if test -n "${syscall_dir}"; then
  SYSCALL_OBJECTLIST=libc/${syscall_dir}/objectlist.awk.in
fi
AC_SUBST(SYSCALL_OBJECTLIST)

if test -n "${unix_dir}"; then
  UNIX_OBJECTLIST=libc/${unix_dir}/objectlist.awk.in
fi
AC_SUBST(UNIX_OBJECTLIST)

if test -n "${stdio64_dir}"; then
  STDIO64_OBJECTLIST=libc/${stdio64_dir}/objectlist.awk.in
fi
AC_SUBST(STDIO64_OBJECTLIST)

# Put a plausible default for CC_FOR_BUILD in Makefile.
if test -z "$CC_FOR_BUILD"; then
  CC_FOR_BUILD=gcc
fi
AC_SUBST(CC_FOR_BUILD)

if test "${newlib_elix_level}" -gt "0"; then
AC_DEFINE_UNQUOTED(_ELIX_LEVEL,${newlib_elix_level})
fi

if test "${newlib_io_c99_formats}" = "yes"; then
AC_DEFINE_UNQUOTED(_WANT_IO_C99_FORMATS)
fi

if test "${newlib_io_long_long}" = "yes"; then
AC_DEFINE_UNQUOTED(_WANT_IO_LONG_LONG)
fi

if test "${newlib_io_long_double}" = "yes"; then
AC_DEFINE_UNQUOTED(_WANT_IO_LONG_DOUBLE)
fi

if test "${newlib_io_pos_args}" = "yes"; then
AC_DEFINE_UNQUOTED(_WANT_IO_POS_ARGS)
fi

if test "${newlib_reent_small}" = "yes"; then
AC_DEFINE_UNQUOTED(_WANT_REENT_SMALL)
fi

if test "${newlib_mb}" = "yes"; then
AC_DEFINE_UNQUOTED(_MB_CAPABLE)
AC_DEFINE_UNQUOTED(_MB_LEN_MAX,8)
else
AC_DEFINE_UNQUOTED(_MB_LEN_MAX,1)
fi

if test "${newlib_iconv_external_ccs}" = "yes"; then
AC_DEFINE_UNQUOTED(_ICONV_ENABLE_EXTERNAL_CCS)
fi

AC_DEFINE_UNQUOTED(_NEWLIB_VERSION,"NEWLIB_VERSION")

if test "${multilib}" = "yes"; then
  multilib_arg="--enable-multilib"
else
  multilib_arg=
fi

if test "${newlib_iconv}" = "yes"; then
AC_DEFINE_UNQUOTED(_ICONV_ENABLED,1)
fi

if test "x${newlib_iconv_external_ccs}" = "xyes"; then
  if test "x${newlib_iconv}" = "x"; then
      AC_MSG_ERROR(--enable-newlib-iconv-external-ccs option can't be used if iconv library is disabled, use --enable-newlib-iconv to enable it.)
  fi
  AC_DEFINE_UNQUOTED(_ICONV_ENABLE_EXTERNAL_CCS,1)
fi

if test "${newlib_atexit_dynamic_alloc}" = "yes"; then
AC_DEFINE_UNQUOTED(_ATEXIT_DYNAMIC_ALLOC)
fi

dnl
dnl Parse --enable-newlib-iconv-encodings option argument
dnl

if test "x${iconv_encodings}" != "x" \
   || test "x${iconv_to_encodings}" != "x" \
   || test "x${iconv_from_encodings}" != "x"; then
  if test "x${newlib_iconv}" = "x"; then
      AC_MSG_ERROR([--enable-newlib-iconv-encodings, --enable-newlib-iconv-from-encodings and --enable-newlib-iconv-to-encodings option can't be used if iconv library is disabled, use --enable-newlib-iconv to enable it.])
  fi
  
  dnl Normalize encodings names and delete commas
  iconv_encodings=`echo "${iconv_encodings}" | sed -e 's/,/ /g' -e 's/-/_/g' -e 'y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/'`
  iconv_to_encodings=`echo "${iconv_to_encodings}" | sed -e 's/,/ /g' -e 's/-/_/g' -e 'y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/'`
  iconv_from_encodings=`echo "${iconv_from_encodings}" | sed -e 's/,/ /g' -e 's/-/_/g' -e 'y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/'`
 
  dnl Get the list of available encodings excluding comments
  dnl Join line with previous if the first character is whitespace
  available_encodings=`cat "${srcdir}/libc/iconv/encoding.aliases" | sed -e '/^#.*/d'`
  
  dnl Check if required encodings are supported
  dnl Convert aliases to names
  
  dnl iconv_encodings
  iconv_encodings1="${iconv_encodings}"
  iconv_encodings=""
  for encoding in ${iconv_encodings1}; do
      result=`echo "${available_encodings}" | grep -e "\(^\| \)${encoding}\( \|\$\)"`
      if test $? != "0"; then
	  AC_MSG_ERROR(${encoding} is not supported - see ${srcdir}/libc/iconv/encoding.aliases file for the list of available encodings)
      fi
      encoding1=`echo "${result}" | sed -e 's/\(^[[^ ]]*\).*$/\1/'`
      iconv_encodings="${iconv_encodings} ${encoding1}"
  done
  dnl Enable appropriate option in newlib.h
  for encoding in ${iconv_encodings}; do
      opt=_ICONV_TO_ENCODING_`echo "${encoding}" | sed -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'`
      AC_DEFINE_UNQUOTED($opt,1)
      opt=_ICONV_FROM_ENCODING_`echo "${encoding}" | sed -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'`
      AC_DEFINE_UNQUOTED($opt,1)
  done

  dnl iconv_to_encodings
  iconv_encodings1="${iconv_to_encodings}"
  iconv_to_encodings=""
  for encoding in ${iconv_encodings1}; do
      result=`echo "${available_encodings}" | grep -e "\(^\| \)${encoding}\( \|\$\)"`
      if test $? != "0"; then
	  AC_MSG_ERROR(${encoding} is not supported - see ${srcdir}/libc/iconv/encoding.aliases file for the list of available encodings)
      fi
      encoding1=`echo "${result}" | sed -e 's/\(^[[^ ]]*\).*$/\1/'`
      iconv_to_encodings="${iconv_to_encodings} ${encoding1}"
  done
  dnl Enable appropriate option in newlib.h
  for encoding in ${iconv_to_encodings}; do
      opt=_ICONV_TO_ENCODING_`echo "${encoding}" | sed -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'`
      AC_DEFINE_UNQUOTED($opt,1)
  done

  dnl iconv_from_encodings
  iconv_encodings1="${iconv_from_encodings}"
  iconv_from_encodings=""
  for encoding in ${iconv_encodings1}; do
      result=`echo "${available_encodings}" | grep -e "\(^\| \)${encoding}\( \|\$\)"`
      if test $? != "0"; then
	  AC_MSG_ERROR(${encoding} is not supported - see ${srcdir}/libc/iconv/encoding.aliases file for the list of available encodings)
      fi
      encoding1=`echo "${result}" | sed -e 's/\(^[[^ ]]*\).*$/\1/'`
      iconv_from_encodings="${iconv_from_encodings} ${encoding1}"
  done
  dnl Enable appropriate option in newlib.h
  for encoding in ${iconv_from_encodings}; do
      opt=_ICONV_FROM_ENCODING_`echo "${encoding}" | sed -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'`
      AC_DEFINE_UNQUOTED($opt,1)
  done
fi;

AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
	       libc_cv_initfinit_array, [dnl
cat > conftest.c <<EOF
int _start (void) { return 0; }
int __start (void) { return 0; }
int foo (void) { return 1; }
int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
EOF
if AC_TRY_COMMAND([${CC} $CFLAGS $CPPFLAGS $LDFLAGS -o conftest conftest.c
		   -static -nostartfiles -nostdlib 1>&AS_MESSAGE_LOG_FD])
then
  if ${READELF} -S conftest | grep -e INIT_ARRAY > /dev/null; then
    libc_cv_initfinit_array=yes
  else
    libc_cv_initfinit_array=no
  fi
else
  libc_cv_initfinit_array=no
fi
rm -f conftest*])
AC_SUBST(libc_cv_initfinit_array)
if test $libc_cv_initfinit_array = yes; then
  AC_DEFINE_UNQUOTED(HAVE_INITFINI_ARRAY)
fi

AC_CACHE_CHECK(for array aliasing support,
	       libc_cv_array_aliasing, [dnl
cat > conftest.c <<EOF
char x[3] = { 'a', 'b', 'c' };
extern char y[2] __attribute__((alias ("x+1")));
EOF
if AC_TRY_COMMAND([${CC} $CFLAGS $CPPFLAGS -c conftest.c
		   1>&AS_MESSAGE_LOG_FD])
then
  libc_cv_array_aliasing=yes
else
  libc_cv_array_aliasing=no
fi
rm -f conftest*])
AC_SUBST(libc_cv_array_aliasing)
if test $libc_cv_array_aliasing = yes; then
  AC_DEFINE_UNQUOTED(_HAVE_ARRAY_ALIASING)
fi

AC_CONFIG_FILES([Makefile],
[if test -n "$CONFIG_FILES"; then
  unset ac_file
  . ${newlib_basedir}/../config-ml.in
fi],
srcdir=${srcdir}
host=${host}
with_multisubdir=${with_multisubdir}
ac_configure_args="${multilib_arg} ${ac_configure_args}"
CONFIG_SHELL=${CONFIG_SHELL-/bin/sh}
newlib_basedir=${newlib_basedir}
CC="${CC}"
LDFLAGS="${LDFLAGS}"
)
AC_OUTPUT