3 dnl Copyright (C) 2003, 2005-2007, 2009-2024 Free Software Foundation, Inc.
4 dnl This file is free software; the Free Software Foundation
5 dnl gives unlimited permission to copy and/or distribute it,
6 dnl with or without modifications, as long as this notice is preserved.
10 dnl gl_RELOCATABLE([RELOCWRAPPER-DIR])
11 dnl ----------------------------------------------------------
12 dnl Support for relocatable programs.
13 dnl Supply RELOCWRAPPER-DIR as the directory where relocwrapper.c may be found.
14 AC_DEFUN([gl_RELOCATABLE],
16 AC_REQUIRE([gl_RELOCATABLE_BODY])
17 gl_RELOCATABLE_LIBRARY
18 : ${RELOCATABLE_CONFIG_H_DIR='$(top_builddir)'}
19 RELOCATABLE_SRC_DIR="\$(top_srcdir)/$gl_source_base"
20 RELOCATABLE_BUILD_DIR="\$(top_builddir)/$gl_source_base"
22 dnl The guts of gl_RELOCATABLE. Needs to be expanded only once.
23 AC_DEFUN([gl_RELOCATABLE_BODY],
25 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.
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 dnl Arghh: AC_BEFORE does not work in this setting :-(
35 dnl AC_BEFORE([AC_PROG_INSTALL],[gl_RELOCATABLE_BODY])
37 dnl LT_INIT sets LIBTOOL, but we want this macro's setting of LIBTOOL to
39 dnl Arghh: AC_BEFORE does not work in this setting :-(
40 dnl AC_BEFORE([LT_INIT],[gl_RELOCATABLE_BODY])
42 AC_REQUIRE([AC_LIB_LIBPATH])
43 AC_REQUIRE([gl_RELOCATABLE_LIBRARY_BODY])
44 AC_REQUIRE([AC_CANONICAL_HOST])
46 use_elf_origin_trick=no
49 if test $RELOCATABLE = yes; then
50 # --enable-relocatable implies --disable-rpath
52 AC_CHECK_HEADERS([mach-o/dyld.h])
53 AC_CHECK_FUNCS([_NSGetExecutablePath])
55 mingw* | windows*) is_noop=yes ;;
56 # For the platforms that support $ORIGIN, see
57 # <https://lekensteyn.nl/rpath.html>.
58 # glibc systems, Linux with musl libc: yes. Android: no.
60 linux* | kfreebsd*) use_elf_origin_trick=yes ;;
61 # Hurd: <https://lists.gnu.org/r/bug-hurd/2019-02/msg00049.html>
62 # only after the glibc commit from 2018-01-08
63 # <https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=311ba8dc4416467947eff2ab327854f124226309>
65 # Test for a glibc version >= 2.27.
66 AC_CHECK_FUNCS([copy_file_range])
67 if test $ac_cv_func_copy_file_range = yes; then
68 use_elf_origin_trick=yes
72 # FreeBSD >= 7.3, DragonFly >= 3.0, MidnightBSD >= 1.1: yes.
73 freebsd | freebsd[1-7] | freebsd[1-6].* | freebsd7.[0-2]) ;;
74 dragonfly | dragonfly[1-2] | dragonfly[1-2].*) ;;
75 midnightbsd | midnightbsd0* | midnightbsd1.0*) ;;
76 freebsd* | dragonfly* | midnightbsd*) use_elf_origin_trick=yes ;;
78 netbsd | netbsd[1-7] | netbsd[1-7].*) ;;
79 netbsdelf | netbsdelf[1-7] | netbsdelf[1-7].*) ;;
80 netbsd*) use_elf_origin_trick=yes ;;
81 # OpenBSD >= 5.4: yes.
82 openbsd | openbsd[1-5] | openbsd[1-4].* | openbsd5.[0-3]) ;;
83 openbsd*) use_elf_origin_trick=yes ;;
85 solaris | solaris2.[1-9] | solaris2.[1-9].*) ;;
86 solaris*) use_elf_origin_trick=yes ;;
88 haiku*) use_elf_origin_trick=yes ;;
89 # On Mac OS X 10.4 or newer, use Mac OS X tools. See
90 # <https://wincent.com/wiki/@executable_path,_@load_path_and_@rpath>.
91 darwin | darwin[1-7].*) ;;
92 darwin*) use_macos_tools=yes ;;
95 if test $is_noop = yes; then
97 AC_SUBST([RELOCATABLE_LDFLAGS])
99 if test $use_elf_origin_trick = yes || test $use_macos_tools = yes; then
100 dnl Use the dynamic linker's support for relocatable programs.
101 case "$ac_aux_dir" in
102 /*) reloc_ldflags="$ac_aux_dir/reloc-ldflags" ;;
103 *) reloc_ldflags="\$(top_builddir)/$ac_aux_dir/reloc-ldflags" ;;
105 RELOCATABLE_LDFLAGS="\"$reloc_ldflags\" \"\$(host)\" \"\$(RELOCATABLE_LIBRARY_PATH)\""
106 AC_SUBST([RELOCATABLE_LDFLAGS])
107 if test $use_macos_tools = yes; then
108 dnl Use a libtool wrapper that uses Mac OS X tools.
109 case "$ac_aux_dir" in
110 /*) LIBTOOL="${CONFIG_SHELL-$SHELL} $ac_aux_dir/libtool-reloc $LIBTOOL" ;;
111 *) LIBTOOL="${CONFIG_SHELL-$SHELL} \$(top_builddir)/$ac_aux_dir/libtool-reloc $LIBTOOL" ;;
116 dnl Unfortunately we cannot define INSTALL_PROGRAM to a command
117 dnl consisting of more than one word - libtool doesn't support this.
118 dnl So we abuse the INSTALL_PROGRAM_ENV hook, originally meant for the
119 dnl 'install-strip' target.
120 INSTALL_PROGRAM_ENV="RELOC_LIBRARY_PATH_VAR=\"$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=\"$INSTALL_PROGRAM\""
121 AC_SUBST([INSTALL_PROGRAM_ENV])
122 case "$ac_aux_dir" in
123 /*) INSTALL_PROGRAM="$ac_aux_dir/install-reloc" ;;
124 *) INSTALL_PROGRAM="\$(top_builddir)/$ac_aux_dir/install-reloc" ;;
129 AM_CONDITIONAL([RELOCATABLE_VIA_LD],
130 [test $is_noop = yes || test $use_elf_origin_trick = yes || test $use_macos_tools = yes])
131 AM_CONDITIONAL([RELOCATABLE_VIA_WRAPPER], [test $use_wrapper = yes])
133 dnl RELOCATABLE_LIBRARY_PATH can be set in configure.ac. Default is empty.
134 AC_SUBST([RELOCATABLE_LIBRARY_PATH])
136 AC_SUBST([RELOCATABLE_CONFIG_H_DIR])
137 AC_SUBST([RELOCATABLE_SRC_DIR])
138 AC_SUBST([RELOCATABLE_BUILD_DIR])
140 dnl Ensure RELOCATABLE_STRIP is defined in Makefiles (at least those
141 dnl generated by automake), with value ':'.
142 RELOCATABLE_STRIP=':'
143 AC_SUBST([RELOCATABLE_STRIP])
146 dnl Determine the platform dependent parameters needed to use relocatability:
148 AC_DEFUN([AC_LIB_LIBPATH],
150 AC_REQUIRE([AC_LIB_PROG_LD]) dnl we use $LD
151 AC_REQUIRE([AC_CANONICAL_HOST]) dnl we use $host
152 AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT]) dnl we use $ac_aux_dir
153 AC_CACHE_CHECK([for shared library path variable], [acl_cv_libpath], [
155 ${CONFIG_SHELL-/bin/sh} "$ac_aux_dir/config.libpath" "$host" > conftest.sh
158 acl_cv_libpath=${acl_cv_shlibpath_var:-none}
160 shlibpath_var="$acl_cv_shlibpath_var"