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265
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1 dnl aclocal.m4 --- Dynamically linked library support for XEmacs
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388
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2 dnl Copyright (C) 1998, 1999 J. Kean Johnston.
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3 dnl Author: J. Kean Johnston <jkj@sco.com>, based on work in libtool.
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4 dnl This file is part of XEmacs.
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5
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6 dnl
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7 dnl There are several things we care about here. First, we need to find
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8 dnl out how we create an executable that has its symbols exported, so
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9 dnl that dynamically loaded modules have access to the internal XEmacs
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10 dnl symbols. This is stored in ``ld_dynamic_link_flags'' and is used
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11 dnl in the main Makefile.
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12 dnl Next, we need to know how we compile actual shared libraries, and
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13 dnl the objects in them. For these purposes, we need to determine the
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14 dnl C compiler flags used to produce shared objects (``dll_cflags''),
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15 dnl what linker to use to create the final shared object that will be
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16 dnl loaded (``dll_ld'') and the flags to pass to that linker
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17 dnl (``dll_ldflags''). This information is used by ellcc to build up
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18 dnl the command line when compiling modules. We build up two other commands
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19 dnl for extremely weird systems where special things need to be done.
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20 dnl The first is ``dll_ldo'', which is the flag used to specify the output
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21 dnl file name, and the second is ``dll_post'' which is inserted after the
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22 dnl list of objects.
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23 dnl After all of this, we should be able to:
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24 dnl $(CC) $(CFLAGS) $(dll_cflags) -c module.c
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25 dnl to produce a single shared object
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26 dnl And then:
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27 dnl $(dll_ld) $(dll_ldflags) $(dll_ldo) module.ell module.o $(dll_post)
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28 dnl to create the loadable shared library.
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29 dnl
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30 dnl NOTE: In the code below, where I have modified things to work with
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31 dnl XEmacs, we use $canonical instead of libtool's $host, and we use
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32 dnl $internal_configuration instead of $host_alias. To make typing
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33 dnl shorter we assign these to $xehost and $xealias
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34
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35 AC_DEFUN(XE_SHLIB_STUFF,[
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36 dll_ld=
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37 dll_ldflags=
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38 dll_cflags=
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39 dll_post=
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40 dll_ldo="-o"
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41 ld_dynamic_link_flags=
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42 xehost=$canonical
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43 xealias=$internal_configuration
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44
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45 AC_CHECKING([how to build dynamic libraries for ${xehost}])
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46 # Transform *-*-linux* to *-*-linux-gnu*, to support old configure scripts.
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47 case "$xehost" in
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48 *-*-linux-gnu*) ;;
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49 *-*-linux*) xehost=`echo $xehost | sed 's/^\(.*-.*-linux\)\(.*\)$/\1-gnu\2/'`
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50 esac
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51
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52 changequote(<<, >>)dnl
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53 xehost_cpu=`echo $xehost | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\1/'`
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54 xehost_vendor=`echo $xehost | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\2/'`
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55 xehost_os=`echo $xehost | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\3/'`
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56 changequote([, ])dnl
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57
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58 case "$xehost_os" in
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59 aix3*)
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60 # AIX sometimes has problems with the GCC collect2 program. For some
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61 # reason, if we set the COLLECT_NAMES environment variable, the problems
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62 # vanish in a puff of smoke.
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63 if test "${COLLECT_NAMES+set}" != set; then
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64 COLLECT_NAMES=
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65 export COLLECT_NAMES
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66 fi
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67 ;;
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68 esac
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69
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70 # Now see if the compiler is really GCC.
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71 if test "$GCC" = "yes"; then
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72 XEGCC=yes
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73 else
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74 AC_MSG_CHECKING(checking whether we are using GNU C)
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75 AC_EGREP_CPP(yes,[
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76 #ifdef __GNUC__
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77 yes;
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78 #endif
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79 ],XEGCC=yes, XEGCC=no)
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80 AC_MSG_RESULT([${XEGCC}])
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81 fi
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82
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83 AC_MSG_CHECKING(how to produce PIC code)
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84 wl=
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85
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86 can_build_shared=yes
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87 if test "$XEGCC" = yes; then
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88 wl='-Wl,'
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89
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90 case "$xehost_os" in
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91 aix3* | aix4* | irix5* | irix6* | osf3* | osf4*)
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92 # PIC is the default for these OSes.
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93 ;;
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94
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95 os2*)
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96 # We can build DLLs from non-PIC.
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97 ;;
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98 amigaos*)
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99 # FIXME: we need at least 68020 code to build shared libraries, but
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100 # adding the `-m68020' flag to GCC prevents building anything better,
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101 # like `-m68040'.
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102 dll_cflags='-m68020 -resident32 -malways-restore-a4'
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103 ;;
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104 *)
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105 dll_cflags='-fPIC'
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106 ;;
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107 esac
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108 else
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109 # PORTME Check for PIC flags for the system compiler.
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110 case "$xehost_os" in
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111 hpux9* | hpux10*)
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112 # Is there a better link_static_flag that works with the bundled CC?
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113 wl='-Wl,'
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114 dll_cflags='+Z'
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115 ;;
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116
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117 irix5* | irix6*)
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118 wl='-Wl,'
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119 # PIC (with -KPIC) is the default.
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120 ;;
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121
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122 os2*)
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123 # We can build DLLs from non-PIC.
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124 ;;
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125
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126 osf3* | osf4*)
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127 # All OSF/1 code is PIC.
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128 wl='-Wl,'
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129 ;;
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130
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131 sco3.2v5*)
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132 dll_cflags='-belf -Kpic'
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133 wl='-Wl,'
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134 ;;
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265
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135
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388
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136 unixware*)
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137 dll_cflags="-KPIC"
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138 wl="-Wl,"
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139 ;;
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140
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141 sysv4*)
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142 dll_cflags="-KPIC"
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143 wl="-Wl,"
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144 ;;
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145
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146 sysv5*)
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147 dll_cflags="-KPIC"
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148 wl="-Wl,"
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149 ;;
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150
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151 solaris2*)
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152 dll_cflags='-KPIC'
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153 wl='-Wl,'
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154 ;;
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155
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156 sunos4*)
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157 dll_cflags='-PIC'
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158 wl='-Qoption ld '
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159 ;;
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160
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161 uts4*)
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162 dll_cflags='-pic'
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163 ;;
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164
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165 *)
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166 can_build_shared=no
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167 ;;
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168 esac
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169 fi
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170
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171 if test -n "$dll_cflags"; then
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172 AC_MSG_RESULT([${dll_cflags}])
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173
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174 # Check to make sure the dll_cflags actually works.
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175 AC_MSG_CHECKING([if PIC flag ${dll_cflags} really works])
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176 save_CFLAGS="$CFLAGS"
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177 CFLAGS="$CFLAGS $dll_cflags -DPIC"
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178 AC_TRY_COMPILE(,[int x=0;],[
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179 # On HP-UX, the stripped-down bundled CC doesn't accept +Z, but also
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180 # reports no error. So, we need to grep stderr for (Bundled).
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181 if grep '(Bundled)' config.log >/dev/null; then
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182 AC_MSG_RESULT(no)
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183 can_build_shared=no
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184 dll_cflags=
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185 else
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186 AC_MSG_RESULT(yes)
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187 fi], [AC_MSG_RESULT(no)
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188 can_build_shared=no
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189 dll_cflags=])
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190 CFLAGS="$save_CFLAGS"
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191 else
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192 AC_MSG_RESULT(none)
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193 fi
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194
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195 dnl
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196 dnl Now comes the LD trickery. We do things differently to libtool here.
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197 dnl I believe that libtool is incorrect in trying to drive the linker
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198 dnl directly. This can cause considerable problems if the module you are
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199 dnl compiling has C++ or other static initializers. If we use ld directly,
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200 dnl we dont end up with the crt stuff being linked in, and we dont end up
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201 dnl with any .init or .fini sections (or the moral equivalent thereof).
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202 dnl gcc takes great care to do this propperly when invoked in -shared
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203 dnl mode, and we really do want this behaviour. Perhaps the libtool folks
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204 dnl are not aware that any SVR4 based dynamic loader will automatically
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205 dnl execute code in the .init section before dlopen() returns. This is
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206 dnl vital, as the module may have been compiled to rely on that behaviour.
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207 dnl
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208 dnl So, having said all of that, we diverge from libtool significantly
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209 dnl here. We want to try and use the C compiler as much as possible. Only
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210 dnl if the C compiler itself cannot create shared libraries to we try to
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211 dnl find the linker.
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212 dnl
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213 dnl The other advantage to my scheme is that it removes the dependancy
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214 dnl on a given compiler version remaining static with relation to the
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215 dnl version of XEmacs. With the libtool way, it picks up the linker that
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216 dnl gcc uses, which can be the internal collect2 that comes with gcc.
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217 dnl If the user ever changes their compiler version, the paths will no
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218 dnl longer be correct, and ellcc will break. This is clearly unacceptable.
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219 dnl By using the compiler driver on the path, we dont have this problem.
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220 dnl If that is not clear, consider that gcc -print-prog-name=ld can
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221 dnl produce something along the lines of:
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222 dnl /usr/local/lib/gcc-lib/OS-NAME/GCC-VERSION/ld
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223 dnl If you ever change GCC versions, then that path no longer exists.
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224 dnl
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225 dnl So, we change the check order here. We first check to see if we are
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226 dnl using GCC, and if so, we see if -shared works. If it does, great.
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227 dnl If we are not using gcc, but the system C compiler can produce
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228 dnl shared objects, we try that. Only if all of that fails do we revert
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229 dnl back to the libtool ld trickery.
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230 dnl
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231 dnl We dont do ANY of this if we can't produce shared objects.
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232 dnl
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233 if test "$can_build_shared" = "yes"; then
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234 cc_produces_so=no
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235 xldf=
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236 xcldf=
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237 AC_MSG_CHECKING(if C compiler can produce shared libraries)
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238 if test "$XEGCC" = yes; then
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239 xcldf="-shared"
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240 xldf="-shared"
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241 else # Not using GCC
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242 case "$xehost_os" in
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243 aix3* | aix4*)
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244 xldf="-bE:ELLSONAME.exp -H512 -T512 -bhalt:4 -bM:SRE -bnoentry -lc"
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245 xcldf="${wl}-bE:ELLSONAME.exp ${wl}-H512 ${wl}-T512 ${wl}-bhalt:4 ${wl}-bM:SRE ${wl}-bnoentry ${wl}-lc"
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246 ;;
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247
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248 freebsd2* | netbsd* | openbsd*)
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249 xldf="-Bshareable"
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250 xcldf="${wl}-Bshareable"
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251 ;;
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252
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253 freebsd3*)
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254 xcldf="-shared"
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255 ;;
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256
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257 hpux*)
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258 xldf="-b +s"
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259 xcldf="${wl}-b ${wl}+s"
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260 ;;
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261
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262 irix5* | irix6* | osf3* | osf4*)
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263 xcldf="${wl}-shared"
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264 xldf="-shared"
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265 ;;
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266
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267 sco3.2v5* | unixware* | sysv5* | sysv4* | solaris2* | solaris7* | uts4*)
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268 xcldf="-G"
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269 xldf="-G"
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270 ;;
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271
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272 sunos4*)
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273 xcldf="${wl}-assert ${wl}pure-text ${wl}-Bstatic"
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274 xldf="-assert pure-text -Bstatic"
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275 ;;
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276 esac
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277 fi # End if if we are using gcc
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265
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278
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388
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279 if test -n "$xcldf"; then
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280 save_LDFLAGS=$LDFLAGS
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281 save_LIBS=$LIBS
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282 save_xe_libs=$xe_libs
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283 LDFLAGS="$xcldf $LDFLAGS"
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284 LIBS=
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285 xe_libs=
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286 ac_link='${CC-cc} -o conftest $CFLAGS '"$xe_cppflags $xe_ldflags"' conftest.$ac_ext '"$xe_libs"' 1>&AC_FD_CC'
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287 AC_TRY_LINK(,[int x=0;],cc_produces_so=yes,cc_produces_so=no)
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288 LDFLAGS=$save_LDFLAGS
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289 LIBS=$save_LIBS
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290 xe_libs=$save_xe_libs
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291 ac_link='${CC-cc} -o conftest $CFLAGS '"$xe_cppflags $xe_ldflags"' conftest.$ac_ext '"$xe_libs"' 1>&AC_FD_CC'
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292 else
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293 cc_produces_so=no
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294 fi
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295 AC_MSG_RESULT([${cc_produces_so}])
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296
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297 LTLD=$LD
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298 if test -z "$LTLD"; then
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299 ac_prog=ld
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300 if test "$XEGCC" = yes; then
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301 # Check if gcc -print-prog-name=ld gives a path.
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302 AC_MSG_CHECKING(for ld used by GCC)
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303 ac_prog=`($CC -print-prog-name=ld) 2>&5`
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304 case "$ac_prog" in
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305 # Accept absolute paths.
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306 /*)
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307 if test -z "$LTLD"; then
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308 case "$ac_prog" in
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309 *gcc-lib*) LTLD="$CC"
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310 ;;
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311 *) LTLD="$ac_prog"
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312 ;;
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313 esac
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314 fi
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315 ;;
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316 "")
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317 # If it fails, then pretend we aren't using GCC.
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318 ac_prog=ld
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319 ;;
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320 *)
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321 # If it is relative, then search for the first ld in PATH.
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322 with_gnu_ld=unknown
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323 ;;
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324 esac
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325 else
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326 AC_MSG_CHECKING(for GNU ld)
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327 fi
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328
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329 if test -z "$LTLD"; then
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330 IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS="${IFS}:"
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331 for ac_dir in $PATH; do
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332 test -z "$ac_dir" && ac_dir=.
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333 if test -f "$ac_dir/$ac_prog"; then
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334 LTLD="$ac_dir/$ac_prog"
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335 # Check to see if the program is GNU ld. I'd rather use --version,
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336 # but apparently some GNU ld's only accept -v.
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337 # Break only if it was the GNU/non-GNU ld that we prefer.
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338 if "$LTLD" -v 2>&1 < /dev/null | egrep '(GNU|with BFD)' > /dev/null; then
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339 xe_gnu_ld=yes
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340 else
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341 xe_gnu_ld=no
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342 fi
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343 fi
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344 done
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345 IFS="$ac_save_ifs"
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346 fi
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347
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348 if test -n "$LTLD"; then
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349 AC_MSG_RESULT([${LTLD}])
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350 else
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351 AC_MSG_RESULT(no)
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352 fi
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353
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354 if test -z "$LTLD" -a "$cc_produces_so" = no; then
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355 AC_MSG_ERROR(no acceptable linker found in \$PATH)
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356 exit 1
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357 fi
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358 fi
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359
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360 dnl
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361 dnl Order of the tests changed somewhat to prevent repetition
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362 dnl
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363 ld_dynamic_link_flags=
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364
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365 # Check to see if it really is or isn't GNU ld.
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366 AC_MSG_CHECKING(if the linker is GNU ld)
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367 # I'd rather use --version here, but apparently some GNU ld's only accept -v.
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368 if $LTLD -v 2>&1 </dev/null | egrep '(GNU|with BFD)' 1>&5; then
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369 xe_gnu_ld=yes
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370 else
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371 xe_gnu_ld=no
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372 fi
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373 AC_MSG_RESULT([${xe_gnu_ld}])
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374
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375 case "$xehost_os" in
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376 amigaos* | sunos4*)
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377 # On these operating systems, we should treat GNU ld like the system ld.
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378 gnu_ld_acts_native=yes
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379 ;;
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380 *)
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381 gnu_ld_acts_native=no
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382 ;;
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383 esac
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384
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385 if test "$cc_produces_so" = "yes"; then
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386 dll_ld=$CC
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387 dll_ldflags=$xcldf
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388 can_build_shared=yes
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389 else
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390 # OK - only NOW do we futz about with ld.
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391 # See if the linker supports building shared libraries.
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392 AC_MSG_CHECKING(whether the linker supports shared libraries)
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393 dll_ld=$CC
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394 dll_ldflags=$LDFLAGS
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395 ld_shlibs=yes
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396 can_build_shared=yes
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397 if test "$xe_gnu_ld" = yes && test "$gnu_ld_acts_native" != yes; then
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398 # See if GNU ld supports shared libraries.
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399 if $LTLD --help 2>&1 | egrep ': supported targets:.* elf' > /dev/null; then
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400 dll_ld=$CC
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401 dll_ldflags="-shared"
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402 ld_shlibs=yes
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403 else
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404 ld_shlibs=no
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405 fi
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406 else
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407 # PORTME fill in a description of your system's linker (not GNU ld)
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408 case "$xehost_os" in
|
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409 aix3*)
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410 dll_ld=$LTLD
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411 dll_ldflags=$xldf
|
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412 ;;
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413
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414 aix4*)
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415 dll_ldflags=$xcldf
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416 ;;
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417
|
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418 # FreeBSD 2.2.[012] allows us to include c++rt0.o to get C++ constructor
|
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419 # support. Future versions do this automatically, but an explicit c++rt0.o
|
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420 # doesn't break anything, and helps significantly (at the cost of a little
|
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|
421 # extra space).
|
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422 freebsd2.2*)
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423 dll_ld=$LTLD
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424 dll_ldflags=$xldf
|
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425 dll_post="/usr/lib/c++rt0.o"
|
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426 ;;
|
|
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427
|
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428 # Unfortunately, older versions of FreeBSD 2 don't have this feature.
|
|
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429 freebsd2*)
|
|
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430 dll_ld=$LTLD
|
|
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431 dll_ldflags="-Bshareable"
|
|
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432 ;;
|
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265
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433
|
|
388
|
434 # FreeBSD 3, at last, uses gcc -shared to do shared libraries.
|
|
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435 freebsd3*)
|
|
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436 dll_ldflags="-shared"
|
|
|
437 ;;
|
|
|
438
|
|
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439 hpux*)
|
|
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440 dll_ld=$LTLD
|
|
|
441 dll_ldflags=$xldf
|
|
|
442 ;;
|
|
|
443
|
|
|
444 irix5* | irix6*)
|
|
|
445 dll_ld=$LTLD
|
|
|
446 dll_ldflags=$xldf
|
|
|
447 ;;
|
|
|
448
|
|
|
449 netbsd*)
|
|
|
450 # Tested with NetBSD 1.2 ld
|
|
|
451 dll_ld=$LTLD
|
|
|
452 dll_ldflags=$xldf
|
|
|
453 ;;
|
|
|
454
|
|
|
455 openbsd*)
|
|
|
456 dll_ld=$LTLD
|
|
|
457 dll_ldflags=$xldf
|
|
|
458 ;;
|
|
|
459
|
|
|
460 osf3* | osf4*)
|
|
|
461 dll_ld=$LTLD
|
|
|
462 dll_ldflags=$xldf
|
|
|
463 ;;
|
|
|
464
|
|
|
465 # For both SCO and Solaris we MAY want to have LDFLAGS include -z text
|
|
|
466 sco3.2v5* | unixware* | sysv5* | sysv4* | solaris2* | solaris7*)
|
|
|
467 dll_ld=$LTLD
|
|
|
468 case "$dll_ld" in
|
|
|
469 *gcc*) dll_ldflags="-shared"
|
|
|
470 dll_ld=$CC
|
|
|
471 ;;
|
|
|
472 *) dll_ldflags="-G"
|
|
|
473 ;;
|
|
|
474 esac
|
|
|
475 ;;
|
|
|
476
|
|
|
477 sunos4*)
|
|
|
478 if test "$XEGCC" = yes; then
|
|
|
479 dll_ld=$CC
|
|
|
480 else
|
|
|
481 dll_ld=$LTLD
|
|
|
482 fi
|
|
|
483 dll_ldflags=$xldf
|
|
|
484 ;;
|
|
|
485
|
|
|
486 uts4*)
|
|
|
487 dll_ld=$LTLD
|
|
|
488 dll_ldflags="-G"
|
|
|
489 ;;
|
|
|
490
|
|
|
491 bsdi*)
|
|
|
492 dll_ldflags="-r"
|
|
|
493 dll_ld="shlicc2"
|
|
|
494 ;;
|
|
|
495
|
|
|
496 *)
|
|
|
497 ld_shlibs=no
|
|
|
498 can_build_shared=no
|
|
|
499 ;;
|
|
|
500 esac
|
|
|
501 fi
|
|
|
502 AC_MSG_RESULT([${ld_shlibs}])
|
|
|
503 if test "$ld_shlibs" = "no"; then
|
|
|
504 can_build_shared=no
|
|
|
505 fi
|
|
|
506 fi # End of if cc_produces_so = no
|
|
265
|
507
|
|
388
|
508 dnl
|
|
|
509 dnl Last thing, check how to get a linked executable to have its symbols
|
|
|
510 dnl exported, so that the modules have access to them.
|
|
|
511 dnl
|
|
|
512 dnl XEmacs FIXME - we need to set ld_dynamic_link_flags propperly for
|
|
|
513 dnl most of these systems, which was missing from libtool. I know they
|
|
|
514 dnl all have a way of doing this, but someone needs to look at this
|
|
|
515 dnl for each OS and make sure it is correct. Remember that the arguments
|
|
|
516 dnl are passed when temacs is linked, this is NOT for modules. The sole
|
|
|
517 dnl purpose of the argument is to get the internal XEmacs symbols exposed
|
|
|
518 dnl for modules to use. This means that the COMPILER (and NOT the linker)
|
|
|
519 dnl is most often used to create temacs, so arguments to the linker will
|
|
|
520 dnl usually need to be prefix with ${wl} or some other such thing.
|
|
|
521 dnl
|
|
|
522
|
|
|
523 if test "$xe_gnu_ld" = yes; then
|
|
|
524 if test "$ld_shlibs" = yes; then
|
|
|
525 ld_dynamic_link_flags="${wl}-export-dynamic"
|
|
|
526 fi
|
|
|
527 fi
|
|
|
528
|
|
|
529 if test -z "$ld_dynamic_link_flags"; then
|
|
|
530 case "$xehost_os" in
|
|
|
531 aix3*)
|
|
|
532 ld_dynamic_link_flags=
|
|
|
533 ;;
|
|
|
534
|
|
|
535 aix4*)
|
|
|
536 ld_dynamic_link_flags=
|
|
|
537 ;;
|
|
|
538
|
|
|
539 freebsd2.2*)
|
|
|
540 ld_dynamic_link_flags=
|
|
|
541 ;;
|
|
|
542
|
|
|
543 freebsd2*)
|
|
|
544 ld_dynamic_link_flags=
|
|
|
545 ;;
|
|
|
546
|
|
|
547 freebsd3*)
|
|
|
548 ld_dynamic_link_flags=
|
|
|
549 ;;
|
|
|
550
|
|
|
551 hpux*)
|
|
|
552 ld_dynamic_link_flags="${wl}-E"
|
|
|
553 ;;
|
|
|
554
|
|
|
555 irix5* | irix6*)
|
|
|
556 ld_dynamic_link_flags=
|
|
|
557 ;;
|
|
|
558
|
|
|
559 netbsd*)
|
|
|
560 ld_dynamic_link_flags=
|
|
|
561 ;;
|
|
|
562
|
|
|
563 openbsd*)
|
|
|
564 ld_dynamic_link_flags=
|
|
|
565 ;;
|
|
|
566
|
|
|
567 osf3* | osf4*)
|
|
|
568 ld_dynamic_link_flags=
|
|
|
569 ;;
|
|
|
570
|
|
|
571 sco3.2v5* | unixware* | sysv5* | sysv4* | solaris2* | solaris7*)
|
|
|
572 ld_dynamic_link_flags="${wl}-Bexport"
|
|
|
573 ;;
|
|
|
574
|
|
|
575 sunos4*)
|
|
|
576 ld_dynamic_link_flags=
|
|
|
577 ;;
|
|
|
578
|
|
|
579 uts4*)
|
|
|
580 ld_dynamic_link_flags=
|
|
|
581 ;;
|
|
|
582
|
|
|
583 bsdi*)
|
|
|
584 ld_dynamic_link_flags=
|
|
|
585 ;;
|
|
|
586
|
|
|
587 esac
|
|
|
588 fi # End of if -z ld_dynamic_link_flags
|
|
|
589 fi # End of if test "$can_build_shared" = "yes"
|
|
|
590
|
|
265
|
591 AC_SUBST(dll_ld)
|
|
|
592 AC_SUBST(dll_cflags)
|
|
388
|
593 AC_SUBST(dll_ldflags)
|
|
|
594 AC_SUBST(dll_post)
|
|
|
595 AC_SUBST(dll_ldo)
|
|
|
596 AC_SUBST(ld_dynamic_link_flags)
|
|
265
|
597 ])dnl
|
|
388
|
598
|
