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1 office 1 # relocatable.m4 serial 17
2 dnl Copyright (C) 2003, 2005-2007, 2009-2011 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.
6  
7 dnl From Bruno Haible.
8  
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],
14 [
15 AC_REQUIRE([gl_RELOCATABLE_BODY])
16 gl_RELOCATABLE_LIBRARY
17 : ${RELOCATABLE_CONFIG_H_DIR='$(top_builddir)'}
18 RELOCATABLE_SRC_DIR="\$(top_srcdir)/$gl_source_base"
19 RELOCATABLE_BUILD_DIR="\$(top_builddir)/$gl_source_base"
20 ])
21 dnl The guts of gl_RELOCATABLE. Needs to be expanded only once.
22 AC_DEFUN([gl_RELOCATABLE_BODY],
23 [
24 AC_REQUIRE([AC_PROG_INSTALL])
25 dnl This AC_BEFORE invocation leads to unjustified autoconf warnings
26 dnl when gl_RELOCATABLE_BODY is invoked more than once.
27 dnl We need this AC_BEFORE because AC_PROG_INSTALL is documented to
28 dnl overwrite earlier settings of INSTALL and INSTALL_PROGRAM (even
29 dnl though in autoconf-2.52..2.60 it doesn't do so), but we want this
30 dnl macro's setting of INSTALL_PROGRAM to persist.
31 AC_BEFORE([AC_PROG_INSTALL],[gl_RELOCATABLE_BODY])
32 AC_REQUIRE([AC_LIB_LIBPATH])
33 AC_REQUIRE([gl_RELOCATABLE_LIBRARY_BODY])
34 is_noop=no
35 use_elf_origin_trick=no
36 use_wrapper=no
37 if test $RELOCATABLE = yes; then
38 # --enable-relocatable implies --disable-rpath
39 enable_rpath=no
40 AC_CHECK_HEADERS([mach-o/dyld.h])
41 AC_CHECK_FUNCS([_NSGetExecutablePath])
42 case "$host_os" in
43 mingw*) is_noop=yes ;;
44 linux*) use_elf_origin_trick=yes ;;
45 esac
46 if test $is_noop = yes; then
47 RELOCATABLE_LDFLAGS=:
48 AC_SUBST([RELOCATABLE_LDFLAGS])
49 else
50 if test $use_elf_origin_trick = yes; then
51 dnl Use the dynamic linker's support for relocatable programs.
52 case "$ac_aux_dir" in
53 /*) reloc_ldflags="$ac_aux_dir/reloc-ldflags" ;;
54 *) reloc_ldflags="\$(top_builddir)/$ac_aux_dir/reloc-ldflags" ;;
55 esac
56 RELOCATABLE_LDFLAGS="\"$reloc_ldflags\" \"\$(host)\" \"\$(RELOCATABLE_LIBRARY_PATH)\""
57 AC_SUBST([RELOCATABLE_LDFLAGS])
58 else
59 use_wrapper=yes
60 dnl Unfortunately we cannot define INSTALL_PROGRAM to a command
61 dnl consisting of more than one word - libtool doesn't support this.
62 dnl So we abuse the INSTALL_PROGRAM_ENV hook, originally meant for the
63 dnl 'install-strip' target.
64 INSTALL_PROGRAM_ENV="RELOC_LIBRARY_PATH_VAR=\"$shlibpath_var\" RELOC_LIBRARY_PATH_VALUE=\"\$(RELOCATABLE_LIBRARY_PATH)\" RELOC_PREFIX=\"\$(prefix)\" RELOC_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=\"$INSTALL_PROGRAM\""
65 AC_SUBST([INSTALL_PROGRAM_ENV])
66 case "$ac_aux_dir" in
67 /*) INSTALL_PROGRAM="$ac_aux_dir/install-reloc" ;;
68 *) INSTALL_PROGRAM="\$(top_builddir)/$ac_aux_dir/install-reloc" ;;
69 esac
70 fi
71 fi
72 fi
73 AM_CONDITIONAL([RELOCATABLE_VIA_LD],
74 [test $is_noop = yes || test $use_elf_origin_trick = yes])
75 AM_CONDITIONAL([RELOCATABLE_VIA_WRAPPER], [test $use_wrapper = yes])
76  
77 dnl RELOCATABLE_LIBRARY_PATH can be set in configure.ac. Default is empty.
78 AC_SUBST([RELOCATABLE_LIBRARY_PATH])
79  
80 AC_SUBST([RELOCATABLE_CONFIG_H_DIR])
81 AC_SUBST([RELOCATABLE_SRC_DIR])
82 AC_SUBST([RELOCATABLE_BUILD_DIR])
83  
84 dnl Ensure RELOCATABLE_STRIP is defined in Makefiles (at least those
85 dnl generated by automake), with value ':'.
86 RELOCATABLE_STRIP=':'
87 AC_SUBST([RELOCATABLE_STRIP])
88 ])
89  
90 dnl Determine the platform dependent parameters needed to use relocatability:
91 dnl shlibpath_var.
92 AC_DEFUN([AC_LIB_LIBPATH],
93 [
94 AC_REQUIRE([AC_LIB_PROG_LD]) dnl we use $LD
95 AC_REQUIRE([AC_CANONICAL_HOST]) dnl we use $host
96 AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT]) dnl we use $ac_aux_dir
97 AC_CACHE_CHECK([for shared library path variable], [acl_cv_libpath], [
98 LD="$LD" \
99 ${CONFIG_SHELL-/bin/sh} "$ac_aux_dir/config.libpath" "$host" > conftest.sh
100 . ./conftest.sh
101 rm -f ./conftest.sh
102 acl_cv_libpath=${acl_cv_shlibpath_var:-none}
103 ])
104 shlibpath_var="$acl_cv_shlibpath_var"
105 ])