Subversion Repositories openrisc_2011-10-31

# Process this file with autoconf to produce a configure script, like so:

#

# aclocal -I .. -I ../config && autoconf && autoheader && automake

AC_PREREQ(2.64)

AC_INIT(libssp, 1.0)

AC_CONFIG_SRCDIR(ssp.c)

AC_CANONICAL_SYSTEM

ACX_NONCANONICAL_TARGET

AM_INIT_AUTOMAKE

AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])

AC_ARG_ENABLE(version-specific-runtime-libs,

[  --enable-version-specific-runtime-libs    Specify that runtime libraries should be installed in a compiler-specific directory ],

[case "$enableval" in

 yes) version_specific_libs=yes ;;

 no)  version_specific_libs=no ;;

 *)   AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;

 esac],

[version_specific_libs=no])

AC_MSG_RESULT($version_specific_libs)

AM_MAINTAINER_MODE

GCC_NO_EXECUTABLES

AM_ENABLE_MULTILIB(, ..)

target_alias=${target_alias-$host_alias}

AC_SUBST(target_alias)

AC_CONFIG_HEADERS(config.h)

AC_LANG_C

# The same as in boehm-gc and libstdc++. Have to borrow it from there.

# We must force CC to /not/ be precious variables; otherwise

# the wrong, non-multilib-adjusted value will be used in multilibs.

# As a side effect, we have to subst CFLAGS ourselves.

m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])

m4_define([_AC_ARG_VAR_PRECIOUS],[])

AC_PROG_CC

m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])

AC_SUBST(CFLAGS)

if test "x$GCC" != "xyes"; then

  AC_MSG_ERROR([libssp must be built with GCC])

fi

AC_PROG_CPP

AC_MSG_CHECKING([whether -fstack-protector works])

save_CFLAGS="$CFLAGS"

CFLAGS="$CFLAGS -fstack-protector -Werror"

AC_TRY_COMPILE([

void __attribute__((noinline)) bar (char *x)

{

  __builtin_memset (x, 0, 64);

}],[char buf[64]; bar (buf);],

[AC_MSG_RESULT(yes)],

[AC_MSG_RESULT(no)])

CFLAGS="$save_CFLAGS"

AC_MSG_CHECKING([whether hidden visibility is supported])

AC_TRY_COMPILE([

void __attribute__((visibility ("hidden"))) bar (void) {}],,

[ssp_hidden=yes],[ssp_hidden=no])

AC_MSG_RESULT($ssp_hidden)

if test x$ssp_hidden = xyes; then

  AC_DEFINE([HAVE_HIDDEN_VISIBILITY],[1],[__attribute__((visibility ("hidden"))) supported])

fi

AC_MSG_CHECKING([whether symbol versioning is supported])

cat > conftest.map <

FOO_1.0 {

  global: *foo*; bar; local: *;

};

EOF

save_LDFLAGS="$LDFLAGS"

LDFLAGS="$LDFLAGS -fPIC -shared -Wl,--version-script,./conftest.map"

if test x$gcc_no_link = xyes; then

  # If we cannot link, we cannot build shared libraries, so do not use

  # symbol versioning.

  ssp_use_symver=no

else

  AC_TRY_LINK([int foo;],[],[ssp_use_symver=yes],[ssp_use_symver=no])

fi

LDFLAGS="$save_LDFLAGS"

AC_MSG_RESULT($ssp_use_symver)

AM_CONDITIONAL(LIBSSP_USE_SYMVER, [test "x$ssp_use_symver" = xyes])

AC_CHECK_HEADERS(alloca.h malloc.h paths.h syslog.h string.h unistd.h fcntl.h stdio.h limits.h)

if test x$gcc_no_link = xyes; then

  # Presume the ISO C functions are available; add target-specific

  # configuration here if required.

  AC_DEFINE(HAVE_STRNCPY)

  AC_DEFINE(HAVE_STRNCAT)

else

  AC_CHECK_FUNCS(mempcpy strncpy strncat)

fi

AC_MSG_CHECKING([whether vsnprintf is usable])

AC_RUN_IFELSE(AC_LANG_PROGRAM([

#include 

#include 

#include 

int foo (char *buf, size_t n, const char *fmt, ...)

{

  va_list ap;

  int ret;

  va_start (ap, fmt);

  ret = vsnprintf (buf, n, fmt, ap);

  va_end (ap);

  return ret;

}],

[char buf@<:@8@:>@; memset (buf, 'A', sizeof (buf));

 if (foo (buf, 4, ".%s.", "CDEFG") != 7)

   return 1;

 return memcmp (buf, ".CD\0AAAA", sizeof (buf)) != 0;]),

[ssp_have_usable_vsnprintf=define],

[ssp_have_usable_vsnprintf=undef],

[ssp_have_usable_vsnprintf=undef])

if test "x$ssp_have_usable_vsnprintf" = xdefine; then

  AC_MSG_RESULT(yes)

  AC_DEFINE([HAVE_USABLE_VSNPRINTF],[1],[vsnprintf is present and works])

else

  AC_MSG_RESULT(no)

fi

AC_SUBST(ssp_have_usable_vsnprintf)

AM_PROG_LIBTOOL

AC_SUBST(enable_shared)

AC_SUBST(enable_static)

# Calculate toolexeclibdir

# Also toolexecdir, though it's only used in toolexeclibdir

case ${version_specific_libs} in

  yes)

    # Need the gcc compiler version to know where to install libraries

    # and header files if --enable-version-specific-runtime-libs option

    # is selected.

    toolexecdir='$(libdir)/gcc/$(target_alias)'

    toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'

    ;;

  no)

    if test -n "$with_cross_host" &&

       test x"$with_cross_host" != x"no"; then

      # Install a library built with a cross compiler in tooldir, not libdir.

      toolexecdir='$(exec_prefix)/$(target_alias)'

      toolexeclibdir='$(toolexecdir)/lib'

    else

      toolexecdir='$(libdir)/gcc-lib/$(target_alias)'

      toolexeclibdir='$(libdir)'

    fi

    multi_os_directory=`$CC -print-multi-os-directory`

    case $multi_os_directory in

      .) ;; # Avoid trailing /.

      *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;

    esac

    ;;

esac

AC_SUBST(toolexecdir)

AC_SUBST(toolexeclibdir)

if test ${multilib} = yes; then

  multilib_arg="--enable-multilib"

else

  multilib_arg=

fi

AC_CONFIG_FILES([Makefile ssp/ssp.h])

AC_OUTPUT