summaryrefslogtreecommitdiff
path: root/m4/relocatable.m4
blob: bbfb44ccfe152c47a6cfd3aae1d9cecbf937e2bd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
# relocatable.m4 serial 23
dnl Copyright (C) 2003, 2005-2007, 2009-2019 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

dnl From Bruno Haible.

dnl gl_RELOCATABLE([RELOCWRAPPER-DIR])
dnl ----------------------------------------------------------
dnl Support for relocatable programs.
dnl Supply RELOCWRAPPER-DIR as the directory where relocwrapper.c may be found.
AC_DEFUN([gl_RELOCATABLE],
[
  AC_REQUIRE([gl_RELOCATABLE_BODY])
  gl_RELOCATABLE_LIBRARY
  : ${RELOCATABLE_CONFIG_H_DIR='$(top_builddir)'}
  RELOCATABLE_SRC_DIR="\$(top_srcdir)/$gl_source_base"
  RELOCATABLE_BUILD_DIR="\$(top_builddir)/$gl_source_base"
])
dnl The guts of gl_RELOCATABLE. Needs to be expanded only once.
AC_DEFUN([gl_RELOCATABLE_BODY],
[
  AC_REQUIRE([AC_PROG_INSTALL])

  dnl This AC_BEFORE invocation leads to unjustified autoconf warnings
  dnl when gl_RELOCATABLE_BODY is invoked more than once.
  dnl
  dnl We need this AC_BEFORE because AC_PROG_INSTALL is documented to
  dnl overwrite earlier settings of INSTALL and INSTALL_PROGRAM (even
  dnl though in autoconf-2.52..2.60 it doesn't do so), but we want this
  dnl macro's setting of INSTALL_PROGRAM to persist.
  dnl Arghh: AC_BEFORE does not work in this setting :-(
  dnl AC_BEFORE([AC_PROG_INSTALL],[gl_RELOCATABLE_BODY])
  dnl
  dnl LT_INIT sets LIBTOOL, but we want this macro's setting of LIBTOOL to
  dnl persist.
  dnl Arghh: AC_BEFORE does not work in this setting :-(
  dnl AC_BEFORE([LT_INIT],[gl_RELOCATABLE_BODY])

  AC_REQUIRE([AC_LIB_LIBPATH])
  AC_REQUIRE([gl_RELOCATABLE_LIBRARY_BODY])
  AC_REQUIRE([AC_CANONICAL_HOST])
  is_noop=no
  use_elf_origin_trick=no
  use_macos_tools=no
  use_wrapper=no
  if test $RELOCATABLE = yes; then
    # --enable-relocatable implies --disable-rpath
    enable_rpath=no
    AC_CHECK_HEADERS([mach-o/dyld.h])
    AC_CHECK_FUNCS([_NSGetExecutablePath])
    case "$host_os" in
      mingw*) is_noop=yes ;;
      # For the platforms that support $ORIGIN, see
      # <https://lekensteyn.nl/rpath.html>.
      # glibc systems, Linux with musl libc: yes. Android: no.
      linux*-android*) ;;
      linux* | kfreebsd*) use_elf_origin_trick=yes ;;
      # Hurd: <http://lists.gnu.org/archive/html/bug-hurd/2019-02/msg00049.html>
      # only after the glibc commit from 2018-01-08
      # <https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=311ba8dc4416467947eff2ab327854f124226309>
      gnu*)
        # Test for a glibc version >= 2.27.
        AC_CHECK_FUNCS([copy_file_range])
        if test $ac_cv_func_copy_file_range = yes; then
          use_elf_origin_trick=yes
        fi
        ;;
changequote(,)dnl
      # FreeBSD >= 7.3, DragonFly >= 3.0: yes.
      freebsd | freebsd[1-7] | freebsd[1-6].* | freebsd7.[0-2]) ;;
      dragonfly | dragonfly[1-2] | dragonfly[1-2].*) ;;
      freebsd* | dragonfly*) use_elf_origin_trick=yes ;;
      # NetBSD >= 8.0: yes.
      netbsd | netbsd[1-7] | netbsd[1-7].*) ;;
      netbsdelf | netbsdelf[1-7] | netbsdelf[1-7].*) ;;
      netbsd*) use_elf_origin_trick=yes ;;
      # OpenBSD >= 5.4: yes.
      openbsd | openbsd[1-5] | openbsd[1-4].* | openbsd5.[0-3]) ;;
      openbsd*) use_elf_origin_trick=yes ;;
      # Solaris >= 10: yes.
      solaris | solaris2.[1-9] | solaris2.[1-9].*) ;;
      solaris*) use_elf_origin_trick=yes ;;
      # Haiku: yes.
      haiku*) use_elf_origin_trick=yes ;;
      # On Mac OS X 10.4 or newer, use Mac OS X tools. See
      # <https://wincent.com/wiki/@executable_path,_@load_path_and_@rpath>.
      darwin | darwin[1-7].*) ;;
      darwin*) use_macos_tools=yes ;;
changequote([,])dnl
    esac
    if test $is_noop = yes; then
      RELOCATABLE_LDFLAGS=:
      AC_SUBST([RELOCATABLE_LDFLAGS])
    else
      if test $use_elf_origin_trick = yes || test $use_macos_tools = yes; then
        dnl Use the dynamic linker's support for relocatable programs.
        case "$ac_aux_dir" in
          /*) reloc_ldflags="$ac_aux_dir/reloc-ldflags" ;;
          *) reloc_ldflags="\$(top_builddir)/$ac_aux_dir/reloc-ldflags" ;;
        esac
        RELOCATABLE_LDFLAGS="\"$reloc_ldflags\" \"\$(host)\" \"\$(RELOCATABLE_LIBRARY_PATH)\""
        AC_SUBST([RELOCATABLE_LDFLAGS])
        if test $use_macos_tools = yes; then
          dnl Use a libtool wrapper that uses Mac OS X tools.
          case "$ac_aux_dir" in
            /*) LIBTOOL="${CONFIG_SHELL-$SHELL} $ac_aux_dir/libtool-reloc $LIBTOOL" ;;
            *) LIBTOOL="${CONFIG_SHELL-$SHELL} \$(top_builddir)/$ac_aux_dir/libtool-reloc $LIBTOOL" ;;
          esac
        fi
      else
        use_wrapper=yes
        dnl Unfortunately we cannot define INSTALL_PROGRAM to a command
        dnl consisting of more than one word - libtool doesn't support this.
        dnl So we abuse the INSTALL_PROGRAM_ENV hook, originally meant for the
        dnl 'install-strip' target.
        INSTALL_PROGRAM_ENV="RELOC_LIBRARY_PATH_VAR=\"$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=\"$INSTALL_PROGRAM\""
        AC_SUBST([INSTALL_PROGRAM_ENV])
        case "$ac_aux_dir" in
          /*) INSTALL_PROGRAM="$ac_aux_dir/install-reloc" ;;
          *) INSTALL_PROGRAM="\$(top_builddir)/$ac_aux_dir/install-reloc" ;;
        esac
      fi
    fi
  fi
  AM_CONDITIONAL([RELOCATABLE_VIA_LD],
    [test $is_noop = yes || test $use_elf_origin_trick = yes || test $use_macos_tools = yes])
  AM_CONDITIONAL([RELOCATABLE_VIA_WRAPPER], [test $use_wrapper = yes])

  dnl RELOCATABLE_LIBRARY_PATH can be set in configure.ac. Default is empty.
  AC_SUBST([RELOCATABLE_LIBRARY_PATH])

  AC_SUBST([RELOCATABLE_CONFIG_H_DIR])
  AC_SUBST([RELOCATABLE_SRC_DIR])
  AC_SUBST([RELOCATABLE_BUILD_DIR])

  dnl Ensure RELOCATABLE_STRIP is defined in Makefiles (at least those
  dnl generated by automake), with value ':'.
  RELOCATABLE_STRIP=':'
  AC_SUBST([RELOCATABLE_STRIP])
])

dnl Determine the platform dependent parameters needed to use relocatability:
dnl shlibpath_var.
AC_DEFUN([AC_LIB_LIBPATH],
[
  AC_REQUIRE([AC_LIB_PROG_LD])            dnl we use $LD
  AC_REQUIRE([AC_CANONICAL_HOST])         dnl we use $host
  AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT]) dnl we use $ac_aux_dir
  AC_CACHE_CHECK([for shared library path variable], [acl_cv_libpath], [
    LD="$LD" \
    ${CONFIG_SHELL-/bin/sh} "$ac_aux_dir/config.libpath" "$host" > conftest.sh
    . ./conftest.sh
    rm -f ./conftest.sh
    acl_cv_libpath=${acl_cv_shlibpath_var:-none}
  ])
  shlibpath_var="$acl_cv_shlibpath_var"
])