1 # relocatable.m4 serial 9
2 dnl Copyright (C) 2003, 2005-2007 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 if test $RELOCATABLE = yes; then
17 AC_LIBOBJ([relocatable])
19 : ${RELOCATABLE_CONFIG_H_DIR='$(top_builddir)'}
20 RELOCATABLE_SRC_DIR="\$(top_srcdir)/$gl_source_base"
21 RELOCATABLE_BUILD_DIR="\$(top_builddir)/$gl_source_base"
23 dnl The guts of gl_RELOCATABLE. Needs to be expanded only once.
24 AC_DEFUN([gl_RELOCATABLE_BODY],
26 AC_REQUIRE([AC_PROG_INSTALL])
27 dnl This AC_BEFORE invocation leads to unjustified autoconf warnings
28 dnl when gl_RELOCATABLE_BODY is invoked more than once.
29 dnl We need this AC_BEFORE because AC_PROG_INSTALL is documented to
30 dnl overwrite earlier settings of INSTALL and INSTALL_PROGRAM (even
31 dnl though in autoconf-2.52..2.60 it doesn't do so), but we want this
32 dnl macro's setting of INSTALL_PROGRAM to persist.
33 AC_BEFORE([AC_PROG_INSTALL],[gl_RELOCATABLE_BODY])
34 AC_REQUIRE([AC_LIB_LIBPATH])
35 AC_REQUIRE([gl_RELOCATABLE_LIBRARY])
37 use_elf_origin_trick=no
38 if test $RELOCATABLE = yes; then
39 # --enable-relocatable implies --disable-rpath
41 AC_CHECK_HEADERS([mach-o/dyld.h])
42 AC_CHECK_FUNCS([_NSGetExecutablePath])
44 mingw*) is_noop=yes ;;
45 linux*) use_elf_origin_trick=yes ;;
47 if test $is_noop = yes; then
49 AC_SUBST([RELOCATABLE_LDFLAGS])
51 if test $use_elf_origin_trick = yes; then
52 dnl Use the dynamic linker's support for relocatable programs.
54 /*) reloc_ldflags="$ac_aux_dir/reloc-ldflags" ;;
55 *) reloc_ldflags="\$(top_builddir)/$ac_aux_dir/reloc-ldflags" ;;
57 RELOCATABLE_LDFLAGS="\"$reloc_ldflags\" \"\$(host)\" \"\$(RELOCATABLE_LIBRARY_PATH)\""
58 AC_SUBST([RELOCATABLE_LDFLAGS])
60 dnl Unfortunately we cannot define INSTALL_PROGRAM to a command
61 dnl consisting of more than one word - libtool doesn't support this.
62 dnl So we abuse the INSTALL_PROGRAM_ENV hook, originally meant for the
63 dnl 'install-strip' target.
64 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\""
65 AC_SUBST([INSTALL_PROGRAM_ENV])
67 /*) INSTALL_PROGRAM="$ac_aux_dir/install-reloc" ;;
68 *) INSTALL_PROGRAM="\$(top_builddir)/$ac_aux_dir/install-reloc" ;;
73 AM_CONDITIONAL([RELOCATABLE_VIA_LD],
74 [test $is_noop = yes || test $use_elf_origin_trick = yes])
76 dnl RELOCATABLE_LIBRARY_PATH can be set in configure.ac. Default is empty.
77 AC_SUBST([RELOCATABLE_LIBRARY_PATH])
78 AC_SUBST([RELOCATABLE_CONFIG_H_DIR])
79 AC_SUBST([RELOCATABLE_SRC_DIR])
80 AC_SUBST([RELOCATABLE_BUILD_DIR])
83 dnl Determine the platform dependent parameters needed to use relocatability:
85 AC_DEFUN([AC_LIB_LIBPATH],
87 AC_REQUIRE([AC_LIB_PROG_LD]) dnl we use $LD
88 AC_REQUIRE([AC_CANONICAL_HOST]) dnl we use $host
89 AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT]) dnl we use $ac_aux_dir
90 AC_CACHE_CHECK([for shared library path variable], acl_cv_libpath, [
92 ${CONFIG_SHELL-/bin/sh} "$ac_aux_dir/config.libpath" "$host" > conftest.sh
95 acl_cv_libpath=${acl_cv_shlibpath_var:-none}
97 shlibpath_var="$acl_cv_shlibpath_var"