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annotate m4/relocatable.m4 @ 19484:10eb9086bea0

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maint: Run 'make update-copyright'
author Paul Eggert <eggert@cs.ucla.edu>
date Mon, 01 Jan 2018 00:57:25 +0000
parents 89722d6723c5
children b06060465f09
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1 # relocatable.m4 serial 19
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2 dnl Copyright (C) 2003, 2005-2007, 2009-2018 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 dnl From Bruno Haible.
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8
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9 dnl gl_RELOCATABLE([RELOCWRAPPER-DIR])
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10 dnl ----------------------------------------------------------
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11 dnl Support for relocatable programs.
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12 dnl Supply RELOCWRAPPER-DIR as the directory where relocwrapper.c may be found.
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13 AC_DEFUN([gl_RELOCATABLE],
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14 [
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15 AC_REQUIRE([gl_RELOCATABLE_BODY])
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16 gl_RELOCATABLE_LIBRARY
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17 : ${RELOCATABLE_CONFIG_H_DIR='$(top_builddir)'}
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18 RELOCATABLE_SRC_DIR="\$(top_srcdir)/$gl_source_base"
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19 RELOCATABLE_BUILD_DIR="\$(top_builddir)/$gl_source_base"
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20 ])
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21 dnl The guts of gl_RELOCATABLE. Needs to be expanded only once.
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22 AC_DEFUN([gl_RELOCATABLE_BODY],
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23 [
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24 AC_REQUIRE([AC_PROG_INSTALL])
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25 dnl This AC_BEFORE invocation leads to unjustified autoconf warnings
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26 dnl when gl_RELOCATABLE_BODY is invoked more than once.
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27 dnl We need this AC_BEFORE because AC_PROG_INSTALL is documented to
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28 dnl overwrite earlier settings of INSTALL and INSTALL_PROGRAM (even
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29 dnl though in autoconf-2.52..2.60 it doesn't do so), but we want this
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30 dnl macro's setting of INSTALL_PROGRAM to persist.
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31 AC_BEFORE([AC_PROG_INSTALL],[gl_RELOCATABLE_BODY])
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32 AC_REQUIRE([AC_LIB_LIBPATH])
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33 AC_REQUIRE([gl_RELOCATABLE_LIBRARY_BODY])
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34 AC_REQUIRE([AC_CANONICAL_HOST])
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35 is_noop=no
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36 use_elf_origin_trick=no
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37 use_wrapper=no
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38 if test $RELOCATABLE = yes; then
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39 # --enable-relocatable implies --disable-rpath
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40 enable_rpath=no
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41 AC_CHECK_HEADERS([mach-o/dyld.h])
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42 AC_CHECK_FUNCS([_NSGetExecutablePath])
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43 case "$host_os" in
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44 mingw*) is_noop=yes ;;
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45 linux* | kfreebsd*) use_elf_origin_trick=yes ;;
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46 esac
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47 if test $is_noop = yes; then
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48 RELOCATABLE_LDFLAGS=:
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49 AC_SUBST([RELOCATABLE_LDFLAGS])
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50 else
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51 if test $use_elf_origin_trick = yes; then
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52 dnl Use the dynamic linker's support for relocatable programs.
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53 case "$ac_aux_dir" in
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54 /*) reloc_ldflags="$ac_aux_dir/reloc-ldflags" ;;
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55 *) reloc_ldflags="\$(top_builddir)/$ac_aux_dir/reloc-ldflags" ;;
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56 esac
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57 RELOCATABLE_LDFLAGS="\"$reloc_ldflags\" \"\$(host)\" \"\$(RELOCATABLE_LIBRARY_PATH)\""
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58 AC_SUBST([RELOCATABLE_LDFLAGS])
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59 else
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60 use_wrapper=yes
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61 dnl Unfortunately we cannot define INSTALL_PROGRAM to a command
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62 dnl consisting of more than one word - libtool doesn't support this.
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63 dnl So we abuse the INSTALL_PROGRAM_ENV hook, originally meant for the
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64 dnl 'install-strip' target.
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65 INSTALL_PROGRAM_ENV="RELOC_LIBRARY_PATH_VAR=\"$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=\"$INSTALL_PROGRAM\""
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66 AC_SUBST([INSTALL_PROGRAM_ENV])
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67 case "$ac_aux_dir" in
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68 /*) INSTALL_PROGRAM="$ac_aux_dir/install-reloc" ;;
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69 *) INSTALL_PROGRAM="\$(top_builddir)/$ac_aux_dir/install-reloc" ;;
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70 esac
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71 fi
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72 fi
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73 fi
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74 AM_CONDITIONAL([RELOCATABLE_VIA_LD],
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75 [test $is_noop = yes || test $use_elf_origin_trick = yes])
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76 AM_CONDITIONAL([RELOCATABLE_VIA_WRAPPER], [test $use_wrapper = yes])
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77
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78 dnl RELOCATABLE_LIBRARY_PATH can be set in configure.ac. Default is empty.
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79 AC_SUBST([RELOCATABLE_LIBRARY_PATH])
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80
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81 AC_SUBST([RELOCATABLE_CONFIG_H_DIR])
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82 AC_SUBST([RELOCATABLE_SRC_DIR])
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83 AC_SUBST([RELOCATABLE_BUILD_DIR])
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84
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85 dnl Ensure RELOCATABLE_STRIP is defined in Makefiles (at least those
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86 dnl generated by automake), with value ':'.
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87 RELOCATABLE_STRIP=':'
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88 AC_SUBST([RELOCATABLE_STRIP])
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89 ])
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90
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91 dnl Determine the platform dependent parameters needed to use relocatability:
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92 dnl shlibpath_var.
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93 AC_DEFUN([AC_LIB_LIBPATH],
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94 [
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95 AC_REQUIRE([AC_LIB_PROG_LD]) dnl we use $LD
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96 AC_REQUIRE([AC_CANONICAL_HOST]) dnl we use $host
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97 AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT]) dnl we use $ac_aux_dir
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98 AC_CACHE_CHECK([for shared library path variable], [acl_cv_libpath], [
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99 LD="$LD" \
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100 ${CONFIG_SHELL-/bin/sh} "$ac_aux_dir/config.libpath" "$host" > conftest.sh
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101 . ./conftest.sh
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102 rm -f ./conftest.sh
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103 acl_cv_libpath=${acl_cv_shlibpath_var:-none}
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104 ])
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105 shlibpath_var="$acl_cv_shlibpath_var"
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106 ])