1 # relocatable.m4 serial 14
2 dnl Copyright (C) 2003, 2005-2007, 2009-2010 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
9 dnl gl_RELOCATABLE([RELOCWRAPPER-DIR])
10 dnl ----------------------------------------------------------
11 dnl Support for relocatable programs.
12 dnl Supply RELOCWRAPPER-DIR as the directory where relocwrapper.c may be found.
13 AC_DEFUN([gl_RELOCATABLE],
15 AC_REQUIRE([gl_RELOCATABLE_BODY])
16 gl_RELOCATABLE_LIBRARY
17 if test $RELOCATABLE = yes; then
18 AC_LIBOBJ([progreloc])
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"
24 dnl The guts of gl_RELOCATABLE. Needs to be expanded only once.
25 AC_DEFUN([gl_RELOCATABLE_BODY],
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])
38 use_elf_origin_trick=no
39 if test $RELOCATABLE = yes; then
40 # --enable-relocatable implies --disable-rpath
42 AC_CHECK_HEADERS([mach-o/dyld.h])
43 AC_CHECK_FUNCS([_NSGetExecutablePath])
45 mingw*) is_noop=yes ;;
46 linux*) use_elf_origin_trick=yes ;;
48 if test $is_noop = yes; then
50 AC_SUBST([RELOCATABLE_LDFLAGS])
52 if test $use_elf_origin_trick = yes; then
53 dnl Use the dynamic linker's support for relocatable programs.
55 /*) reloc_ldflags="$ac_aux_dir/reloc-ldflags" ;;
56 *) reloc_ldflags="\$(top_builddir)/$ac_aux_dir/reloc-ldflags" ;;
58 RELOCATABLE_LDFLAGS="\"$reloc_ldflags\" \"\$(host)\" \"\$(RELOCATABLE_LIBRARY_PATH)\""
59 AC_SUBST([RELOCATABLE_LDFLAGS])
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=\"$shlibpath_var\" RELOC_LIBRARY_PATH_VALUE=\"\$(RELOCATABLE_LIBRARY_PATH)\" RELOC_PREFIX=\"\$(prefix)\" RELOC_DESTDIR=\"\$(DESTDIR)\" RELOC_COMPILE_COMMAND=\"\$(CC) \$(CPPFLAGS) \$(CFLAGS) \$(LDFLAGS)\" RELOC_SRCDIR=\"\$(RELOCATABLE_SRC_DIR)\" RELOC_BUILDDIR=\"\$(RELOCATABLE_BUILD_DIR)\" RELOC_CONFIG_H_DIR=\"\$(RELOCATABLE_CONFIG_H_DIR)\" RELOC_EXEEXT=\"\$(EXEEXT)\" RELOC_STRIP_PROG=\"\$(RELOCATABLE_STRIP)\" RELOC_INSTALL_PROG=\"$INSTALL_PROGRAM\""
66 AC_SUBST([INSTALL_PROGRAM_ENV])
68 /*) INSTALL_PROGRAM="$ac_aux_dir/install-reloc" ;;
69 *) INSTALL_PROGRAM="\$(top_builddir)/$ac_aux_dir/install-reloc" ;;
74 AM_CONDITIONAL([RELOCATABLE_VIA_LD],
75 [test $is_noop = yes || test $use_elf_origin_trick = yes])
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])
84 dnl Determine the platform dependent parameters needed to use relocatability:
86 AC_DEFUN([AC_LIB_LIBPATH],
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], [
93 ${CONFIG_SHELL-/bin/sh} "$ac_aux_dir/config.libpath" "$host" > conftest.sh
96 acl_cv_libpath=${acl_cv_shlibpath_var:-none}
98 shlibpath_var="$acl_cv_shlibpath_var"