1# relocatable.m4 serial 11
2dnl Copyright (C) 2003, 2005-2007 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7dnl From Bruno Haible.
8
9dnl gl_RELOCATABLE([RELOCWRAPPER-DIR])
10dnl ----------------------------------------------------------
11dnl Support for relocatable programs.
12dnl Supply RELOCWRAPPER-DIR as the directory where relocwrapper.c may be found.
13AC_DEFUN([gl_RELOCATABLE],
14[
15  AC_REQUIRE([gl_RELOCATABLE_BODY])
16  gl_RELOCATABLE_LIBRARY
17  if test $RELOCATABLE = yes; then
18    AC_LIBOBJ([progreloc])
19  fi
20  : ${RELOCATABLE_CONFIG_H_DIR='$(top_builddir)'}
21  RELOCATABLE_SRC_DIR="\$(top_srcdir)/$gl_source_base"
22  RELOCATABLE_BUILD_DIR="\$(top_builddir)/$gl_source_base"
23])
24dnl The guts of gl_RELOCATABLE. Needs to be expanded only once.
25AC_DEFUN([gl_RELOCATABLE_BODY],
26[
27  AC_REQUIRE([AC_PROG_INSTALL])
28  dnl This AC_BEFORE invocation leads to unjustified autoconf warnings
29  dnl when gl_RELOCATABLE_BODY is invoked more than once.
30  dnl We need this AC_BEFORE because AC_PROG_INSTALL is documented to
31  dnl overwrite earlier settings of INSTALL and INSTALL_PROGRAM (even
32  dnl though in autoconf-2.52..2.60 it doesn't do so), but we want this
33  dnl macro's setting of INSTALL_PROGRAM to persist.
34  AC_BEFORE([AC_PROG_INSTALL],[gl_RELOCATABLE_BODY])
35  AC_REQUIRE([AC_LIB_LIBPATH])
36  AC_REQUIRE([gl_RELOCATABLE_LIBRARY_BODY])
37  is_noop=no
38  use_elf_origin_trick=no
39  if test $RELOCATABLE = yes; then
40    # --enable-relocatable implies --disable-rpath
41    enable_rpath=no
42    AC_CHECK_HEADERS([mach-o/dyld.h])
43    AC_CHECK_FUNCS([_NSGetExecutablePath])
44    case "$host_os" in
45      mingw*) is_noop=yes ;;
46      linux*) use_elf_origin_trick=yes ;;
47    esac
48    if test $is_noop = yes; then
49      RELOCATABLE_LDFLAGS=:
50      AC_SUBST([RELOCATABLE_LDFLAGS])
51    else
52      if test $use_elf_origin_trick = yes; then
53        dnl Use the dynamic linker's support for relocatable programs.
54        case "$ac_aux_dir" in
55          /*) reloc_ldflags="$ac_aux_dir/reloc-ldflags" ;;
56          *) reloc_ldflags="\$(top_builddir)/$ac_aux_dir/reloc-ldflags" ;;
57        esac
58        RELOCATABLE_LDFLAGS="\"$reloc_ldflags\" \"\$(host)\" \"\$(RELOCATABLE_LIBRARY_PATH)\""
59        AC_SUBST([RELOCATABLE_LDFLAGS])
60      else
61        dnl Unfortunately we cannot define INSTALL_PROGRAM to a command
62        dnl consisting of more than one word - libtool doesn't support this.
63        dnl So we abuse the INSTALL_PROGRAM_ENV hook, originally meant for the
64        dnl 'install-strip' target.
65        INSTALL_PROGRAM_ENV="RELOC_LIBRARY_PATH_VAR=\"$shlibpath_var\" RELOC_LIBRARY_PATH_VALUE=\"\$(RELOCATABLE_LIBRARY_PATH)\" RELOC_PREFIX=\"\$(prefix)\" RELOC_COMPILE_COMMAND=\"\$(CC) \$(CPPFLAGS) \$(CFLAGS) \$(LDFLAGS)\" RELOC_SRCDIR=\"\$(RELOCATABLE_SRC_DIR)\" RELOC_BUILDDIR=\"\$(RELOCATABLE_BUILD_DIR)\" RELOC_CONFIG_H_DIR=\"\$(RELOCATABLE_CONFIG_H_DIR)\" RELOC_EXEEXT=\"\$(EXEEXT)\" RELOC_INSTALL_PROG=\"$INSTALL_PROGRAM\""
66        AC_SUBST([INSTALL_PROGRAM_ENV])
67        case "$ac_aux_dir" in
68          /*) INSTALL_PROGRAM="$ac_aux_dir/install-reloc" ;;
69          *) INSTALL_PROGRAM="\$(top_builddir)/$ac_aux_dir/install-reloc" ;;
70        esac
71      fi
72    fi
73  fi
74  AM_CONDITIONAL([RELOCATABLE_VIA_LD],
75    [test $is_noop = yes || test $use_elf_origin_trick = yes])
76
77  dnl RELOCATABLE_LIBRARY_PATH can be set in configure.ac. Default is empty.
78  AC_SUBST([RELOCATABLE_LIBRARY_PATH])
79  AC_SUBST([RELOCATABLE_CONFIG_H_DIR])
80  AC_SUBST([RELOCATABLE_SRC_DIR])
81  AC_SUBST([RELOCATABLE_BUILD_DIR])
82])
83
84dnl Determine the platform dependent parameters needed to use relocatability:
85dnl shlibpath_var.
86AC_DEFUN([AC_LIB_LIBPATH],
87[
88  AC_REQUIRE([AC_LIB_PROG_LD])            dnl we use $LD
89  AC_REQUIRE([AC_CANONICAL_HOST])         dnl we use $host
90  AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT]) dnl we use $ac_aux_dir
91  AC_CACHE_CHECK([for shared library path variable], acl_cv_libpath, [
92    LD="$LD" \
93    ${CONFIG_SHELL-/bin/sh} "$ac_aux_dir/config.libpath" "$host" > conftest.sh
94    . ./conftest.sh
95    rm -f ./conftest.sh
96    acl_cv_libpath=${acl_cv_shlibpath_var:-none}
97  ])
98  shlibpath_var="$acl_cv_shlibpath_var"
99])
100