libobjc/configure.ac

   1 # Process this file with autoconf to produce a configure script.
   2 #   Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2003, 2004
   3 #   Free Software Foundation, Inc.
   4 #   Originally contributed by Dave Love (d.love@dl.ac.uk).
   5 #
   6 #This file is part of GCC.
   7 #
   8 #GCC is free software; you can redistribute it and/or modify
   9 #it under the terms of the GNU General Public License as published by
  10 #the Free Software Foundation; either version 2, or (at your option)
  11 #any later version.
  12 #
  13 #GCC is distributed in the hope that it will be useful,
  14 #but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 #MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 #GNU General Public License for more details.
  17 #
  18 #You should have received a copy of the GNU General Public License
  19 #along with GCC; see the file COPYING.  If not, write to
  20 #the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  21 #02111-1307, USA.
  22
  23 AC_PREREQ(2.59)
  24 AC_INIT(package-unused, version-unused,, libobjc)
  25 AC_CONFIG_SRCDIR([objc/objc.h])
  26 GCC_TOPLEV_SUBDIRS
  27
  28 # We need the following definitions because AC_PROG_LIBTOOL relies on them
  29 PACKAGE=libobjc
  30 # Version is pulled out to make it a bit easier to change using sed.
  31 VERSION=1:0:0
  32 AC_SUBST(VERSION)
  33
  34 # This works around the fact that libtool configuration may change LD
  35 # for this particular configuration, but some shells, instead of
  36 # keeping the changes in LD private, export them just because LD is
  37 # exported.
  38 ORIGINAL_LD_FOR_MULTILIBS=$LD
  39
  40 # -------
  41 # Options
  42 # -------
  43
  44 # Default to --enable-multilib
  45 AC_ARG_ENABLE(multilib,
  46   [  --enable-multilib       build hella library versions (default)],
  47   [case "${enableval}" in
  48     yes) multilib=yes ;;
  49     no)  multilib=no ;;
  50     *)   AC_MSG_ERROR(bad value ${enableval} for multilib option) ;;
  51    esac],
  52   [multilib=yes])
  53
  54 # We use these options to decide which functions to include.
  55 AC_ARG_WITH(target-subdir,
  56 [  --with-target-subdir=SUBDIR
  57                            configuring in a subdirectory])
  58 AC_ARG_WITH(cross-host,
  59 [  --with-cross-host=HOST  configuring with a cross compiler])
  60
  61 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
  62 AC_ARG_ENABLE(version-specific-runtime-libs,
  63 [  --enable-version-specific-runtime-libs    Specify that runtime libraries should be installed in a compiler-specific directory ],
  64 [case "$enableval" in
  65  yes) version_specific_libs=yes ;;
  66  no)  version_specific_libs=no ;;
  67  *)   AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
  68  esac],
  69 [version_specific_libs=no])
  70 AC_MSG_RESULT($version_specific_libs)
  71
  72 AC_ARG_ENABLE(objc-gc,
  73 [  --enable-objc-gc       enable the use of Boehm's garbage collector with
  74                           the GNU Objective-C runtime.],
  75 [case $enable_objc_gc in
  76   no) OBJC_BOEHM_GC='' ;;
  77   *) OBJC_BOEHM_GC=libobjc_gc.la ;;
  78 esac],
  79 [OBJC_BOEHM_GC=''])
  80 AC_SUBST(OBJC_BOEHM_GC)
  81
  82 # -----------
  83 # Directories
  84 # -----------
  85
  86 # When building with srcdir == objdir, links to the source files will
  87 # be created in directories within the target_subdir.  We have to
  88 # adjust toplevel_srcdir accordingly, so that configure finds
  89 # install-sh and other auxiliary files that live in the top-level
  90 # source directory.
  91 if test "${srcdir}" = "."; then
  92   if test -z "${with_target_subdir}"; then
  93     toprel=".."
  94   else
  95     if test "${with_target_subdir}" != "."; then
  96       toprel="${with_multisrctop}../.."
  97     else
  98       toprel="${with_multisrctop}.."
  99     fi
 100   fi
 101 else
 102   toprel=".."
 103 fi
 104 AC_CONFIG_AUX_DIR(${srcdir}/$toprel)
 105 toplevel_srcdir=\${srcdir}/$toprel
 106 AC_SUBST(toplevel_srcdir)
 107
 108 AC_CANONICAL_SYSTEM
 109 ACX_NONCANONICAL_TARGET
 110
 111 # Export source directory.
 112 # These need to be absolute paths, yet at the same time need to
 113 # canonicalize only relative paths, because then amd will not unmount
 114 # drives. Thus the use of PWDCMD: set it to 'pawd' or 'amq -w' if using amd.
 115 case $srcdir in
 116   [\\/$]* | ?:[\\/]*) glibcpp_srcdir=${srcdir} ;;
 117   *) glibcpp_srcdir=`cd "$srcdir" && ${PWDCMD-pwd} || echo "$srcdir"` ;;
 118 esac
 119 AC_SUBST(glibcpp_srcdir)
 120
 121 # Calculate toolexeclibdir
 122 # Also toolexecdir, though it's only used in toolexeclibdir
 123 case ${version_specific_libs} in
 124   yes)
 125     # Need the gcc compiler version to know where to install libraries
 126     # and header files if --enable-version-specific-runtime-libs option
 127     # is selected.
 128     toolexecdir='$(libdir)/gcc/$(target_noncanonical)'
 129     toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
 130     ;;
 131   no)
 132     if test -n "$with_cross_host" &&
 133        test x"$with_cross_host" != x"no"; then
 134       # Install a library built with a cross compiler in tooldir, not libdir.
 135       toolexecdir='$(exec_prefix)/$(target_noncanonical)'
 136       toolexeclibdir='$(toolexecdir)/lib'
 137     else
 138       toolexecdir='$(libdir)/gcc-lib/$(target_noncanonical)'
 139       toolexeclibdir='$(libdir)'
 140     fi
 141     multi_os_directory=`$CC -print-multi-os-directory`
 142     case $multi_os_directory in
 143       .) ;; # Avoid trailing /.
 144       *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
 145     esac
 146     ;;
 147 esac
 148 AC_SUBST(toolexecdir)
 149 AC_SUBST(toolexeclibdir)
 150
 151 # Figure out if we want to name the include directory and the
 152 #  library name changes differently.
 153 includedirname=include
 154 libext=
 155 case "${host}" in
 156   *-darwin*)
 157     # Darwin is the only target so far that needs a different include directory.
 158     includedirname=include-gnu-runtime
 159     libext=-gnu
 160     ;;
 161 esac
 162 AC_SUBST(includedirname)
 163 AC_SUBST(libext)
 164
 165 AC_CONFIG_HEADERS(config.h)
 166
 167 # --------
 168 # Programs
 169 # --------
 170
 171 GCC_NO_EXECUTABLES
 172
 173 # We must force CC to /not/ be a precious variable; otherwise
 174 # the wrong, non-multilib-adjusted value will be used in multilibs.
 175 # As a side effect, we have to subst CFLAGS ourselves.
 176 m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
 177 m4_define([_AC_ARG_VAR_PRECIOUS],[])
 178 AC_PROG_CC
 179 m4_rename([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
 180
 181 # extra LD Flags which are required for targets
 182 case "${host}" in
 183   *-darwin*)
 184     # Darwin needs -single_module when linking libobjc
 185     extra_ldflags_libobjc=-Wl,-single_module
 186     ;;
 187 esac
 188 AC_SUBST(extra_ldflags_libobjc)
 189
 190 AC_SUBST(CFLAGS)
 191
 192 AC_CHECK_TOOL(AS, as)
 193 AC_CHECK_TOOL(AR, ar)
 194 AC_CHECK_TOOL(RANLIB, ranlib, :)
 195 AC_PROG_INSTALL
 196
 197 AM_MAINTAINER_MODE
 198
 199 # Enable Win32 DLL on MS Windows - FIXME
 200 AC_LIBTOOL_WIN32_DLL
 201
 202 AC_PROG_LIBTOOL
 203
 204 AM_PROG_CC_C_O
 205
 206 AC_PROG_MAKE_SET
 207
 208 # -------
 209 # Headers
 210 # -------
 211
 212 # Sanity check for the cross-compilation case:
 213 AC_CHECK_HEADER(stdio.h,:,
 214   [AC_MSG_ERROR([Can't find stdio.h.
 215 You must have a usable C system for the target already installed, at least
 216 including headers and, preferably, the library, before you can configure
 217 the Objective C runtime system.  If necessary, install gcc now with
 218 \`LANGUAGES=c', then the target library, then build with \`LANGUAGES=objc'.])])
 219
 220 AC_HEADER_STDC
 221
 222 AC_CHECK_HEADERS(sched.h)
 223
 224 # -----------
 225 # Miscellanea
 226 # -----------
 227
 228 AC_MSG_CHECKING([for thread model used by GCC])
 229 target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`
 230 AC_MSG_RESULT([$target_thread_file])
 231
 232 if test $target_thread_file != single; then
 233   AC_DEFINE(HAVE_GTHR_DEFAULT, 1,
 234         [Define if the compiler has a thread header that is non single.])
 235 fi
 236
 237
 238 AC_MSG_CHECKING([for exception model to use])
 239 AC_LANG_PUSH(C)
 240 AC_ARG_ENABLE(sjlj-exceptions,
 241   AS_HELP_STRING([--enable-sjlj-exceptions],
 242                  [force use of builtin_setjmp for exceptions]),
 243 [:],
 244 [dnl Botheration.  Now we've got to detect the exception model.
 245 dnl Link tests against libgcc.a are problematic since -- at least
 246 dnl as of this writing -- we've not been given proper -L bits for
 247 dnl single-tree newlib and libgloss.
 248 dnl
 249 dnl This is what AC_TRY_COMPILE would do if it didn't delete the
 250 dnl conftest files before we got a change to grep them first.
 251 cat > conftest.$ac_ext << EOF
 252 [#]line __oline__ "configure"
 253 @interface Frob
 254 @end
 255 @implementation Frob
 256 @end
 257 int proc();
 258 int foo()
 259 {
 260   @try {
 261    return proc();
 262   }
 263   @catch (Frob* ex) {
 264     return 0;
 265   }
 266 }
 267 EOF
 268 old_CFLAGS="$CFLAGS"
 269 dnl work around that we don't have Objective-C support in autoconf
 270 CFLAGS="-x objective-c -fgnu-runtime -fobjc-exceptions -S"
 271 if AC_TRY_EVAL(ac_compile); then
 272   if grep _Unwind_SjLj_Resume conftest.s >/dev/null 2>&1 ; then
 273     enable_sjlj_exceptions=yes
 274   elif grep _Unwind_Resume conftest.s >/dev/null 2>&1 ; then
 275     enable_sjlj_exceptions=no
 276   fi
 277 fi
 278 CFLAGS="$old_CFLAGS"
 279 rm -f conftest*])
 280 if test x$enable_sjlj_exceptions = xyes; then
 281   AC_DEFINE(SJLJ_EXCEPTIONS, 1,
 282         [Define if the compiler is configured for setjmp/longjmp exceptions.])
 283   ac_exception_model_name=sjlj
 284 elif test x$enable_sjlj_exceptions = xno; then
 285   ac_exception_model_name="call frame"
 286 else
 287   AC_MSG_ERROR([unable to detect exception model])
 288 fi
 289 AC_LANG_POP(C)
 290 AC_MSG_RESULT($ac_exception_model_name)
 291
 292 # ------
 293 # Output
 294 # ------
 295
 296 AC_CONFIG_FILES([Makefile])
 297
 298 AC_CONFIG_COMMANDS([default],
 299 [[if test -n "$CONFIG_FILES"; then
 300   if test -n "${with_target_subdir}"; then
 301     # FIXME: We shouldn't need to set ac_file
 302     ac_file=Makefile
 303     LD="${ORIGINAL_LD_FOR_MULTILIBS}"
 304     . ${toplevel_srcdir}/config-ml.in
 305   fi
 306 fi]],
 307 [[srcdir=${srcdir}
 308 host=${host}
 309 target=${target}
 310 with_target_subdir=${with_target_subdir}
 311 with_multisubdir=${with_multisubdir}
 312 ac_configure_args="--enable-multilib ${ac_configure_args}"
 313 toplevel_srcdir=${toplevel_srcdir}
 314 CONFIG_SHELL=${CONFIG_SHELL-/bin/sh}
 315 ORIGINAL_LD_FOR_MULTILIBS="${ORIGINAL_LD_FOR_MULTILIBS}"
 316 ]])
 317
 318 AC_OUTPUT