1# Process this file with autoconf to produce a configure script.
2#   Copyright (C) 1994-2022 Free Software Foundation, Inc.
3#   Originally contributed by Dave Love (d.love@dl.ac.uk).
4#
5#This file is part of GCC.
6#
7#GCC is free software; you can redistribute it and/or modify
8#it under the terms of the GNU General Public License as published by
9#the Free Software Foundation; either version 3, or (at your option)
10#any later version.
11#
12#GCC is distributed in the hope that it will be useful,
13#but WITHOUT ANY WARRANTY; without even the implied warranty of
14#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15#GNU General Public License for more details.
16#
17#You should have received a copy of the GNU General Public License
18#along with GCC; see the file COPYING3.  If not see
19#<http://www.gnu.org/licenses/>.
20
21AC_INIT(package-unused, version-unused,, libobjc)
22AC_CONFIG_SRCDIR([objc/objc.h])
23GCC_TOPLEV_SUBDIRS
24
25# We need the following definitions because AC_PROG_LIBTOOL relies on them
26PACKAGE=libobjc
27# Version is pulled out to make it a bit easier to change using sed.
28VERSION=4:0:0
29AC_SUBST(VERSION)
30
31# This works around the fact that libtool configuration may change LD
32# for this particular configuration, but some shells, instead of
33# keeping the changes in LD private, export them just because LD is
34# exported.
35ORIGINAL_LD_FOR_MULTILIBS=$LD
36
37# -------
38# Options
39# -------
40
41# We use these options to decide which functions to include.
42AC_ARG_WITH(target-subdir,
43[  --with-target-subdir=SUBDIR
44                           configuring in a subdirectory])
45AC_ARG_WITH(cross-host,
46[  --with-cross-host=HOST  configuring with a cross compiler])
47
48AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
49AC_ARG_ENABLE(version-specific-runtime-libs,
50[  --enable-version-specific-runtime-libs    Specify that runtime libraries should be installed in a compiler-specific directory ],
51[case "$enableval" in
52 yes) version_specific_libs=yes ;;
53 no)  version_specific_libs=no ;;
54 *)   AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
55 esac],
56[version_specific_libs=no])
57AC_MSG_RESULT($version_specific_libs)
58
59# -----------
60# Directories
61# -----------
62
63# Find the rest of the source tree framework.
64AM_ENABLE_MULTILIB(, ..)
65
66AC_CANONICAL_SYSTEM
67ACX_NONCANONICAL_TARGET
68
69# Export source directory.
70# These need to be absolute paths, yet at the same time need to
71# canonicalize only relative paths, because then amd will not unmount
72# drives. Thus the use of PWDCMD: set it to 'pawd' or 'amq -w' if using amd.
73case $srcdir in
74  [\\/$]* | ?:[\\/]*) glibcpp_srcdir=${srcdir} ;;
75  *) glibcpp_srcdir=`cd "$srcdir" && ${PWDCMD-pwd} || echo "$srcdir"` ;;
76esac
77AC_SUBST(glibcpp_srcdir)
78
79GCC_WITH_TOOLEXECLIBDIR
80
81# Calculate toolexeclibdir
82# Also toolexecdir, though it's only used in toolexeclibdir
83case ${version_specific_libs} in
84  yes)
85    # Need the gcc compiler version to know where to install libraries
86    # and header files if --enable-version-specific-runtime-libs option
87    # is selected.
88    toolexecdir='$(libdir)/gcc/$(target_noncanonical)'
89    toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
90    ;;
91  no)
92    if test -n "$with_cross_host" &&
93       test x"$with_cross_host" != x"no"; then
94      # Install a library built with a cross compiler in tooldir, not libdir.
95      toolexecdir='$(exec_prefix)/$(target_noncanonical)'
96      case ${with_toolexeclibdir} in
97	no)
98	  toolexeclibdir='$(toolexecdir)/lib'
99	  ;;
100	*)
101	  toolexeclibdir=${with_toolexeclibdir}
102	  ;;
103      esac
104    else
105      toolexecdir='$(libdir)/gcc-lib/$(target_noncanonical)'
106      toolexeclibdir='$(libdir)'
107    fi
108    multi_os_directory=`$CC -print-multi-os-directory`
109    case $multi_os_directory in
110      .) ;; # Avoid trailing /.
111      *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
112    esac
113    ;;
114esac
115AC_SUBST(toolexecdir)
116AC_SUBST(toolexeclibdir)
117
118# Figure out if we want to name the include directory and the
119#  library name changes differently.
120includedirname=include
121libsuffix=
122case "${host}" in
123  *-darwin*)
124    # Darwin is the only target so far that needs a different include directory.
125    includedirname=include-gnu-runtime
126    libsuffix=-gnu
127    ;;
128esac
129AC_SUBST(includedirname)
130AC_SUBST(libsuffix)
131
132AC_CONFIG_HEADERS(config.h)
133
134# --------
135# Programs
136# --------
137
138GCC_NO_EXECUTABLES
139
140# We must force CC to /not/ be a precious variable; otherwise
141# the wrong, non-multilib-adjusted value will be used in multilibs.
142# As a side effect, we have to subst CFLAGS ourselves.
143m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
144m4_define([_AC_ARG_VAR_PRECIOUS],[])
145AC_PROG_CC
146m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
147
148# extra LD Flags which are required for targets
149ACX_LT_HOST_FLAGS
150case "${host}" in
151  *-darwin*)
152    # Darwin needs -single_module when linking libobjc
153    extra_ldflags_libobjc='$(lt_host_flags) -Wl,-single_module'
154    ;;
155  *-cygwin*|*-mingw*)
156    # Tell libtool to build DLLs on Windows
157    extra_ldflags_libobjc='$(lt_host_flags)'
158    ;;
159esac
160AC_SUBST(extra_ldflags_libobjc)
161
162# Add CET specific flags if CET is enabled
163GCC_CET_FLAGS(CET_FLAGS)
164XCFLAGS="$XCFLAGS $CET_FLAGS"
165
166AC_SUBST(CFLAGS)
167AC_SUBST(XCFLAGS)
168
169AC_CHECK_TOOL(AS, as)
170AC_CHECK_TOOL(AR, ar)
171AC_CHECK_TOOL(RANLIB, ranlib, :)
172AC_PROG_INSTALL
173
174AM_MAINTAINER_MODE
175
176# Enable Win32 DLL on MS Windows - FIXME
177AC_LIBTOOL_WIN32_DLL
178
179AC_PROG_LIBTOOL
180
181AM_PROG_CC_C_O
182
183AC_PROG_MAKE_SET
184
185# -------
186# Headers
187# -------
188
189# Sanity check for the cross-compilation case:
190AC_CHECK_HEADER(stdio.h,:,
191  [AC_MSG_ERROR([Can't find stdio.h.
192You must have a usable C system for the target already installed, at least
193including headers and, preferably, the library, before you can configure
194the Objective C runtime system.  If necessary, install gcc now with 
195\`LANGUAGES=c', then the target library, then build with \`LANGUAGES=objc'.])])
196
197AC_HEADER_STDC
198
199AC_CHECK_HEADERS(sched.h)
200
201# -----------
202# Miscellanea
203# -----------
204
205# Check if we have thread-local storage
206GCC_CHECK_TLS
207
208gt_BITFIELD_TYPE_MATTERS
209
210# -----------
211# boehm-gc
212# -----------
213
214AC_ARG_ENABLE(objc-gc,
215[AS_HELP_STRING([--enable-objc-gc],
216		[enable use of Boehm's garbage collector with the
217		 GNU Objective-C runtime])],,enable_objc_gc=no)
218AC_ARG_WITH([target-bdw-gc],
219[AS_HELP_STRING([--with-target-bdw-gc=PATHLIST],
220		[specify prefix directory for installed bdw-gc package.
221		 Equivalent to --with-target-bdw-gc-include=PATH/include
222		 plus --with-target-bdw-gc-lib=PATH/lib])])
223AC_ARG_WITH([target-bdw-gc-include],
224[AS_HELP_STRING([--with-target-bdw-gc-include=PATHLIST],
225		[specify directories for installed bdw-gc include files])])
226AC_ARG_WITH([target-bdw-gc-lib],
227[AS_HELP_STRING([--with-target-bdw-gc-lib=PATHLIST],
228		[specify directories for installed bdw-gc library])])
229		  
230case "$enable_objc_gc" in
231no)
232  use_bdw_gc=no
233  ;;
234*)
235  AC_MSG_CHECKING([for bdw garbage collector])
236  if test "x$with_target_bdw_gc$with_target_bdw_gc_include$with_target_bdw_gc_lib" = x; then
237    dnl no bdw-gw options, assuming bdw-gc in default locations
238    BDW_GC_CFLAGS=
239    BDW_GC_LIBS="-lgc"
240  else
241    dnl bdw-gw options passed by configure flags
242    if test "x$with_target_bdw_gc_include" = x && test "x$with_target_bdw_gc_lib" != x; then
243      AC_MSG_ERROR([found --with-target-bdw-gc-lib but --with-target-bdw-gc-include missing])
244    elif test "x$with_target_bdw_gc_include" != x && test "x$with_target_bdw_gc_lib" = x; then
245      AC_MSG_ERROR([found --with-target-bdw-gc-include but --with-target-bdw-gc-lib missing])
246    else
247      AC_MSG_RESULT([using paths configured with --with-target-bdw-gc options])
248    fi
249    mldir=`${CC-gcc} --print-multi-directory 2>/dev/null`
250    bdw_val=
251    if test "x$with_target_bdw_gc" != x; then
252      for i in `echo $with_target_bdw_gc | tr ',' ' '`; do
253        case "$i" in
254          *=*) sd=${i%%=*}; d=${i#*=} ;;
255          *) sd=.; d=$i ;;
256        esac
257        if test "$mldir" = "$sd"; then
258          bdw_val=$d
259        fi
260      done
261      if test "x$bdw_val" = x; then
262        AC_MSG_ERROR([no multilib path ($mldir) found in --with-target-bdw-gc])
263      fi
264      bdw_inc_dir="$bdw_val/include"
265      bdw_lib_dir="$bdw_val/lib"
266    fi
267    bdw_val=
268    if test "x$with_target_bdw_gc_include" != x; then
269      for i in `echo $with_target_bdw_gc_include | tr ',' ' '`; do
270        case "$i" in
271          *=*) sd=${i%%=*}; d=${i#*=} ;;
272          *) sd=.; d=$i; fallback=$i ;;
273        esac
274        if test "$mldir" = "$sd"; then
275          bdw_val=$d
276        fi
277      done
278      if test "x$bdw_val" = x && test "x$bdw_inc_dir" = x && test "x$fallback" != x; then
279        bdw_inc_dir="$fallback"
280      elif test "x$bdw_val" = x; then
281        AC_MSG_ERROR([no multilib path ($mldir) found in --with-target-bdw-gc-include])
282      else
283        bdw_inc_dir="$bdw_val"
284      fi
285    fi
286    bdw_val=
287    if test "x$with_target_bdw_gc_lib" != x; then
288      for i in `echo $with_target_bdw_gc_lib | tr ',' ' '`; do
289        case "$i" in
290          *=*) sd=${i%%=*}; d=${i#*=} ;;
291          *) sd=.; d=$i ;;
292        esac
293        if test "$mldir" = "$sd"; then
294          bdw_val=$d
295        fi
296      done
297      if test "x$bdw_val" = x; then
298        AC_MSG_ERROR([no multilib path ($mldir) found in --with-target-bdw-gc-lib])
299      fi
300      bdw_lib_dir="$bdw_val"
301    fi
302    if test "x$bdw_inc_dir" = x; then
303      AC_MSG_ERROR([no multilib path ($mldir) found in --with-target-bdw-gc-include])
304    fi
305    if test "x$bdw_lib_dir" = x; then
306      AC_MSG_ERROR([no multilib path ($mldir) found in --with-target-bdw-gc-lib])
307    fi
308    BDW_GC_CFLAGS="-I$bdw_inc_dir"
309    if test -f $bdw_lib_dir/libgc.la; then
310      BDW_GC_LIBS="$bdw_lib_dir/libgc.la"
311    else
312      BDW_GC_LIBS="-L$bdw_lib_dir -lgc"
313    fi
314    AC_MSG_RESULT([found])
315  fi
316
317  case "$BDW_GC_LIBS" in
318  *libgc.la)
319    use_bdw_gc=yes
320    ;;
321  *)
322    AC_MSG_CHECKING([for system boehm-gc])
323    save_CFLAGS=$CFLAGS
324    save_LIBS=$LIBS
325    CFLAGS="$CFLAGS $BDW_GC_CFLAGS"
326    LIBS="$LIBS $BDW_GC_LIBS"
327    dnl the link test is not good enough for ARM32 multilib detection,
328    dnl first check to link, then to run
329    AC_LINK_IFELSE(
330      [AC_LANG_PROGRAM([#include <gc/gc.h>],[GC_init()])],
331      [
332        AC_RUN_IFELSE([AC_LANG_SOURCE([[
333          #include <gc/gc.h>
334          int main() {
335            GC_init();
336            return 0;
337          }
338          ]])],
339          [system_bdw_gc_found=yes],
340          [system_bdw_gc_found=no],
341          dnl assume no system boehm-gc for cross builds ...
342          [system_bdw_gc_found=no]
343        )
344      ],
345      [system_bdw_gc_found=no])
346    CFLAGS=$save_CFLAGS
347    LIBS=$save_LIBS
348    if test x$enable_objc_gc = xauto && test x$system_bdw_gc_found = xno; then
349      AC_MSG_WARN([system bdw-gc not found, not building libobjc_gc])
350      use_bdw_gc=no
351    elif test x$enable_objc_gc = xyes && test x$system_bdw_gc_found = xno; then
352      AC_MSG_ERROR([system bdw-gc required but not found])
353    else
354      use_bdw_gc=yes
355      AC_MSG_RESULT([found])
356    fi
357  esac
358esac
359
360if test "$use_bdw_gc" = no; then
361  OBJC_GCFLAGS=''
362  OBJC_BOEHM_GC=''
363  OBJC_BOEHM_GC_INCLUDES=''
364  OBJC_BOEHM_GC_LIBS=''
365else
366  OBJC_GCFLAGS='-DOBJC_WITH_GC=1'
367  OBJC_BOEHM_GC='libobjc_gc$(libsuffix).la'
368  OBJC_BOEHM_GC_INCLUDES=$BDW_GC_CFLAGS
369  OBJC_BOEHM_GC_LIBS=$BDW_GC_LIBS
370fi
371AC_SUBST(OBJC_GCFLAGS)
372AC_SUBST(OBJC_BOEHM_GC)
373AC_SUBST(OBJC_BOEHM_GC_INCLUDES)
374AC_SUBST(OBJC_BOEHM_GC_LIBS)
375
376# Determine what GCC version number to use in filesystem paths.
377GCC_BASE_VER
378
379# ------
380# Output
381# ------
382
383if test ${multilib} = yes; then
384  multilib_arg="--enable-multilib"
385else
386  multilib_arg=
387fi
388
389AC_CONFIG_FILES([Makefile])
390AC_OUTPUT
391