1# relocatable.m4 serial 23
2dnl Copyright (C) 2003, 2005-2007, 2009-2020 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  : ${RELOCATABLE_CONFIG_H_DIR='$(top_builddir)'}
18  RELOCATABLE_SRC_DIR="\$(top_srcdir)/$gl_source_base"
19  RELOCATABLE_BUILD_DIR="\$(top_builddir)/$gl_source_base"
20])
21dnl The guts of gl_RELOCATABLE. Needs to be expanded only once.
22AC_DEFUN([gl_RELOCATABLE_BODY],
23[
24  AC_REQUIRE([AC_PROG_INSTALL])
25
26  dnl This AC_BEFORE invocation leads to unjustified autoconf warnings
27  dnl when gl_RELOCATABLE_BODY is invoked more than once.
28  dnl
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  dnl Arghh: AC_BEFORE does not work in this setting :-(
34  dnl AC_BEFORE([AC_PROG_INSTALL],[gl_RELOCATABLE_BODY])
35  dnl
36  dnl LT_INIT sets LIBTOOL, but we want this macro's setting of LIBTOOL to
37  dnl persist.
38  dnl Arghh: AC_BEFORE does not work in this setting :-(
39  dnl AC_BEFORE([LT_INIT],[gl_RELOCATABLE_BODY])
40
41  AC_REQUIRE([AC_LIB_LIBPATH])
42  AC_REQUIRE([gl_RELOCATABLE_LIBRARY_BODY])
43  AC_REQUIRE([AC_CANONICAL_HOST])
44  is_noop=no
45  use_elf_origin_trick=no
46  use_macos_tools=no
47  use_wrapper=no
48  if test $RELOCATABLE = yes; then
49    # --enable-relocatable implies --disable-rpath
50    enable_rpath=no
51    AC_CHECK_HEADERS([mach-o/dyld.h])
52    AC_CHECK_FUNCS([_NSGetExecutablePath])
53    case "$host_os" in
54      mingw*) is_noop=yes ;;
55      # For the platforms that support $ORIGIN, see
56      # <https://lekensteyn.nl/rpath.html>.
57      # glibc systems, Linux with musl libc: yes. Android: no.
58      linux*-android*) ;;
59      linux* | kfreebsd*) use_elf_origin_trick=yes ;;
60      # Hurd: <https://lists.gnu.org/r/bug-hurd/2019-02/msg00049.html>
61      # only after the glibc commit from 2018-01-08
62      # <https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=311ba8dc4416467947eff2ab327854f124226309>
63      gnu*)
64        # Test for a glibc version >= 2.27.
65        AC_CHECK_FUNCS([copy_file_range])
66        if test $ac_cv_func_copy_file_range = yes; then
67          use_elf_origin_trick=yes
68        fi
69        ;;
70changequote(,)dnl
71      # FreeBSD >= 7.3, DragonFly >= 3.0: yes.
72      freebsd | freebsd[1-7] | freebsd[1-6].* | freebsd7.[0-2]) ;;
73      dragonfly | dragonfly[1-2] | dragonfly[1-2].*) ;;
74      freebsd* | dragonfly*) use_elf_origin_trick=yes ;;
75      # NetBSD >= 8.0: yes.
76      netbsd | netbsd[1-7] | netbsd[1-7].*) ;;
77      netbsdelf | netbsdelf[1-7] | netbsdelf[1-7].*) ;;
78      netbsd*) use_elf_origin_trick=yes ;;
79      # OpenBSD >= 5.4: yes.
80      openbsd | openbsd[1-5] | openbsd[1-4].* | openbsd5.[0-3]) ;;
81      openbsd*) use_elf_origin_trick=yes ;;
82      # Solaris >= 10: yes.
83      solaris | solaris2.[1-9] | solaris2.[1-9].*) ;;
84      solaris*) use_elf_origin_trick=yes ;;
85      # Haiku: yes.
86      haiku*) use_elf_origin_trick=yes ;;
87      # On Mac OS X 10.4 or newer, use Mac OS X tools. See
88      # <https://wincent.com/wiki/@executable_path,_@load_path_and_@rpath>.
89      darwin | darwin[1-7].*) ;;
90      darwin*) use_macos_tools=yes ;;
91changequote([,])dnl
92    esac
93    if test $is_noop = yes; then
94      RELOCATABLE_LDFLAGS=:
95      AC_SUBST([RELOCATABLE_LDFLAGS])
96    else
97      if test $use_elf_origin_trick = yes || test $use_macos_tools = yes; then
98        dnl Use the dynamic linker's support for relocatable programs.
99        case "$ac_aux_dir" in
100          /*) reloc_ldflags="$ac_aux_dir/reloc-ldflags" ;;
101          *) reloc_ldflags="\$(top_builddir)/$ac_aux_dir/reloc-ldflags" ;;
102        esac
103        RELOCATABLE_LDFLAGS="\"$reloc_ldflags\" \"\$(host)\" \"\$(RELOCATABLE_LIBRARY_PATH)\""
104        AC_SUBST([RELOCATABLE_LDFLAGS])
105        if test $use_macos_tools = yes; then
106          dnl Use a libtool wrapper that uses Mac OS X tools.
107          case "$ac_aux_dir" in
108            /*) LIBTOOL="${CONFIG_SHELL-$SHELL} $ac_aux_dir/libtool-reloc $LIBTOOL" ;;
109            *) LIBTOOL="${CONFIG_SHELL-$SHELL} \$(top_builddir)/$ac_aux_dir/libtool-reloc $LIBTOOL" ;;
110          esac
111        fi
112      else
113        use_wrapper=yes
114        dnl Unfortunately we cannot define INSTALL_PROGRAM to a command
115        dnl consisting of more than one word - libtool doesn't support this.
116        dnl So we abuse the INSTALL_PROGRAM_ENV hook, originally meant for the
117        dnl 'install-strip' target.
118        INSTALL_PROGRAM_ENV="RELOC_LIBRARY_PATH_VAR=\"$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=\"$INSTALL_PROGRAM\""
119        AC_SUBST([INSTALL_PROGRAM_ENV])
120        case "$ac_aux_dir" in
121          /*) INSTALL_PROGRAM="$ac_aux_dir/install-reloc" ;;
122          *) INSTALL_PROGRAM="\$(top_builddir)/$ac_aux_dir/install-reloc" ;;
123        esac
124      fi
125    fi
126  fi
127  AM_CONDITIONAL([RELOCATABLE_VIA_LD],
128    [test $is_noop = yes || test $use_elf_origin_trick = yes || test $use_macos_tools = yes])
129  AM_CONDITIONAL([RELOCATABLE_VIA_WRAPPER], [test $use_wrapper = yes])
130
131  dnl RELOCATABLE_LIBRARY_PATH can be set in configure.ac. Default is empty.
132  AC_SUBST([RELOCATABLE_LIBRARY_PATH])
133
134  AC_SUBST([RELOCATABLE_CONFIG_H_DIR])
135  AC_SUBST([RELOCATABLE_SRC_DIR])
136  AC_SUBST([RELOCATABLE_BUILD_DIR])
137
138  dnl Ensure RELOCATABLE_STRIP is defined in Makefiles (at least those
139  dnl generated by automake), with value ':'.
140  RELOCATABLE_STRIP=':'
141  AC_SUBST([RELOCATABLE_STRIP])
142])
143
144dnl Determine the platform dependent parameters needed to use relocatability:
145dnl shlibpath_var.
146AC_DEFUN([AC_LIB_LIBPATH],
147[
148  AC_REQUIRE([AC_LIB_PROG_LD])            dnl we use $LD
149  AC_REQUIRE([AC_CANONICAL_HOST])         dnl we use $host
150  AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT]) dnl we use $ac_aux_dir
151  AC_CACHE_CHECK([for shared library path variable], [acl_cv_libpath], [
152    LD="$LD" \
153    ${CONFIG_SHELL-/bin/sh} "$ac_aux_dir/config.libpath" "$host" > conftest.sh
154    . ./conftest.sh
155    rm -f ./conftest.sh
156    acl_cv_libpath=${acl_cv_shlibpath_var:-none}
157  ])
158  shlibpath_var="$acl_cv_shlibpath_var"
159])
160