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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([${XEGCC}])
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81 fi
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82
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83 AC_MSG_CHECKING(how to produce PIC code)
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84 wl=
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85
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86 can_build_shared=yes
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87 cygwin_warn=
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88 if test "$XEGCC" = yes; then
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89 wl='-Wl,'
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90
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91 case "$xehost_os" in
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92 aix[[3-9]]* | irix[[5-9]]* | osf[[3-9]])
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93 # PIC is the default for these OSes.
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94 ;;
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95
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96 os2*)
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97 # We can build DLLs from non-PIC.
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98 ;;
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99 amigaos*)
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100 # FIXME: we need at least 68020 code to build shared libraries, but
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101 # adding the `-m68020' flag to GCC prevents building anything better,
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102 # like `-m68040'.
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103 dll_cflags='-m68020 -resident32 -malways-restore-a4'
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104 ;;
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105 *cygwin* | *mingw* )
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106 # PIC is the default
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107 cygwin_warn=yes
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108 # #### Need some trickery involving import libraries that we don't
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109 # currently support.
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110 can_build_shared=no
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442
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111 ;;
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112 *)
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113 dll_cflags='-fPIC'
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114 ;;
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115 esac
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116 else
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117 # PORTME Check for PIC flags for the system compiler.
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118 case "$xehost_os" in
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119 hpux9* | hpux1[[0-9]]*)
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120 # Is there a better link_static_flag that works with the bundled CC?
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121 wl='-Wl,'
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122 dll_cflags='+Z'
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123 ;;
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124
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460
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125 irix[[5-9]]*)
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126 wl='-Wl,'
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127 # PIC (with -KPIC) is the default.
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128 ;;
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129
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130 os2*)
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131 # We can build DLLs from non-PIC.
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132 ;;
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133
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134 osf[[3-9]]*)
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135 # All OSF/1 code is PIC.
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136 wl='-Wl,'
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137 ;;
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138
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460
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139 aix[[3-9]]*)
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140 # All AIX code is PIC.
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141 wl='-Wl,'
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142 ;;
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143
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388
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144 sco3.2v5*)
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145 dll_cflags='-belf -Kpic'
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146 wl='-Wl,'
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147 ;;
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148
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149 unixware*)
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150 dll_cflags="-KPIC"
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151 wl="-Wl,"
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152 ;;
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153
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154 sysv4*)
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155 dll_cflags="-KPIC"
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156 wl="-Wl,"
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157 ;;
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158
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159 sysv5*)
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160 dll_cflags="-KPIC"
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161 wl="-Wl,"
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162 ;;
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163
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164 solaris2*)
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165 dll_cflags='-KPIC'
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166 wl='-Wl,'
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167 ;;
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168
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169 sunos4*)
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170 dll_cflags='-PIC'
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171 wl='-Qoption ld '
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172 ;;
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173
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174 uts4*)
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175 dll_cflags='-pic'
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176 ;;
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177
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178 *)
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179 can_build_shared=no
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180 ;;
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181 esac
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182 fi
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183
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184 if test -n "$dll_cflags"; then
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185 AC_MSG_RESULT([${dll_cflags}])
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442
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186
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388
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187 # Check to make sure the dll_cflags actually works.
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188 AC_MSG_CHECKING([if PIC flag ${dll_cflags} really works])
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189 save_CFLAGS="$CFLAGS"
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190 CFLAGS="$CFLAGS $dll_cflags -DPIC"
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191 AC_TRY_COMPILE(,[int x=0;],[
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192 # On HP-UX, the stripped-down bundled CC doesn't accept +Z, but also
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193 # reports no error. So, we need to grep stderr for (Bundled).
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194 if grep '(Bundled)' config.log >/dev/null; then
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195 AC_MSG_RESULT(no)
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196 can_build_shared=no
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197 dll_cflags=
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198 else
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199 AC_MSG_RESULT(yes)
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200 fi], [AC_MSG_RESULT(no)
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201 can_build_shared=no
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202 dll_cflags=])
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203 CFLAGS="$save_CFLAGS"
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204 else
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205 AC_MSG_RESULT(none)
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206 fi
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207
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208 if test -n "$cygwin_warn"; then
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209 AC_MSG_WARN([Cannot currently build modules under Cygwin.])
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210 fi
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211
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212 dnl
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213 dnl Now comes the LD trickery. We do things differently to libtool here.
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214 dnl I believe that libtool is incorrect in trying to drive the linker
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215 dnl directly. This can cause considerable problems if the module you are
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216 dnl compiling has C++ or other static initializers. If we use ld directly,
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217 dnl we don't end up with the crt stuff being linked in, and we don't end up
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218 dnl with any .init or .fini sections (or the moral equivalent thereof).
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219 dnl gcc takes great care to do this properly when invoked in -shared
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220 dnl mode, and we really do want this behavior. Perhaps the libtool folks
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221 dnl are not aware that any SVR4 based dynamic loader will automatically
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222 dnl execute code in the .init section before dlopen() returns. This is
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223 dnl vital, as the module may have been compiled to rely on that behavior.
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224 dnl
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225 dnl So, having said all of that, we diverge from libtool significantly
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226 dnl here. We want to try and use the C compiler as much as possible. Only
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227 dnl if the C compiler itself cannot create shared libraries to we try to
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228 dnl find the linker.
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229 dnl
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230 dnl The other advantage to my scheme is that it removes the dependancy
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231 dnl on a given compiler version remaining static with relation to the
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232 dnl version of XEmacs. With the libtool way, it picks up the linker that
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233 dnl gcc uses, which can be the internal collect2 that comes with gcc.
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234 dnl If the user ever changes their compiler version, the paths will no
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235 dnl longer be correct, and ellcc will break. This is clearly unacceptable.
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236 dnl By using the compiler driver on the path, we don't have this problem.
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237 dnl If that is not clear, consider that gcc -print-prog-name=ld can
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238 dnl produce something along the lines of:
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239 dnl /usr/local/lib/gcc-lib/OS-NAME/GCC-VERSION/ld
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240 dnl If you ever change GCC versions, then that path no longer exists.
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241 dnl
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242 dnl So, we change the check order here. We first check to see if we are
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243 dnl using GCC, and if so, we see if -shared works. If it does, great.
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244 dnl If we are not using gcc, but the system C compiler can produce
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245 dnl shared objects, we try that. Only if all of that fails do we revert
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246 dnl back to the libtool ld trickery.
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247 dnl
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442
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248 dnl We don't do ANY of this if we can't produce shared objects.
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249 dnl
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250 if test "$can_build_shared" = "yes"; then
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251 cc_produces_so=no
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252 xldf=
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253 xcldf=
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254 AC_MSG_CHECKING(if C compiler can produce shared libraries)
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255 if test "$XEGCC" = yes; then
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256 xcldf="-shared"
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257 xldf="-shared"
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258 else # Not using GCC
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259 case "$xehost_os" in
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260 aix[[3-9]]*)
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261 xldf="-bE:ELLSONAME.exp -H512 -T512 -bhalt:4 -bM:SRE -bnoentry -lc"
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262 xcldf="${wl}-bE:ELLSONAME.exp ${wl}-H512 ${wl}-T512 ${wl}-bhalt:4 ${wl}-bM:SRE ${wl}-bnoentry ${wl}-lc"
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263 ;;
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264
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265 freebsd2* | netbsd* | openbsd*)
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266 xldf="-Bshareable"
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267 xcldf="${wl}-Bshareable"
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268 ;;
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269
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270 freebsd3*)
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271 xcldf="-shared"
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272 ;;
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273
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274 hpux*)
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275 xldf="-b +s"
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276 xcldf="${wl}-b ${wl}+s"
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277 ;;
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278
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279 irix[[5-9]]* | osf[[3-9]]*)
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280 xcldf="${wl}-shared"
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281 xldf="-shared"
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282 ;;
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283
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284 sco3.2v5* | unixware* | sysv5* | sysv4* | solaris2* | solaris7* | uts4*)
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285 xcldf="-G"
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286 xldf="-G"
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287 ;;
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288
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289 sunos4*)
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290 xcldf="${wl}-assert ${wl}pure-text ${wl}-Bstatic"
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291 xldf="-assert pure-text -Bstatic"
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292 ;;
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293 esac
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294 fi # End if if we are using gcc
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265
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295
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388
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296 if test -n "$xcldf"; then
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297 save_LDFLAGS=$LDFLAGS
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298 save_LIBS=$LIBS
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299 save_xe_libs=$xe_libs
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300 LDFLAGS="$xcldf $LDFLAGS"
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301 LIBS=
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302 xe_libs=
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303 ac_link='${CC-cc} -o conftest $CFLAGS '"$xe_cppflags $xe_ldflags"' conftest.$ac_ext '"$xe_libs"' 1>&AC_FD_CC'
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304 AC_TRY_LINK(,[int x=0;],cc_produces_so=yes,cc_produces_so=no)
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305 LDFLAGS=$save_LDFLAGS
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306 LIBS=$save_LIBS
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307 xe_libs=$save_xe_libs
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308 ac_link='${CC-cc} -o conftest $CFLAGS '"$xe_cppflags $xe_ldflags"' conftest.$ac_ext '"$xe_libs"' 1>&AC_FD_CC'
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309 else
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310 cc_produces_so=no
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311 fi
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312 AC_MSG_RESULT([${cc_produces_so}])
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313
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314 LTLD=$LD
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315 if test -z "$LTLD"; then
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316 ac_prog=ld
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317 if test "$XEGCC" = yes; then
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318 # Check if gcc -print-prog-name=ld gives a path.
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319 AC_MSG_CHECKING(for ld used by GCC)
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320 ac_prog=`($CC -print-prog-name=ld) 2>&5`
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321 case "$ac_prog" in
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322 # Accept absolute paths.
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323 /*)
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324 if test -z "$LTLD"; then
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325 # case "$ac_prog" in
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326 # *gcc-lib*) LTLD="$CC"
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327 # ;;
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328 # *)
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329 LTLD="$ac_prog"
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330 # ;;
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331 # esac
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388
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332 fi
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333 ;;
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334 "")
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335 # If it fails, then pretend we aren't using GCC.
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336 ac_prog=ld
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337 ;;
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338 *)
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339 # If it is relative, then search for the first ld in PATH.
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340 with_gnu_ld=unknown
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341 ;;
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342 esac
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343 else
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344 AC_MSG_CHECKING(for GNU ld)
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345 fi
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346
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347 if test -z "$LTLD"; then
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348 IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS="${IFS}:"
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349 for ac_dir in $PATH; do
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350 test -z "$ac_dir" && ac_dir=.
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351 if test -f "$ac_dir/$ac_prog"; then
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352 LTLD="$ac_dir/$ac_prog"
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353 # Check to see if the program is GNU ld. I'd rather use --version,
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354 # but apparently some GNU ld's only accept -v.
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355 # Break only if it was the GNU/non-GNU ld that we prefer.
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356 if "$LTLD" -v 2>&1 < /dev/null | egrep '(GNU|with BFD)' > /dev/null; then
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357 xe_gnu_ld=yes
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358 else
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359 xe_gnu_ld=no
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360 fi
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361 fi
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362 done
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363 IFS="$ac_save_ifs"
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364 fi
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365
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366 if test -n "$LTLD"; then
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367 AC_MSG_RESULT([${LTLD}])
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368 else
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369 AC_MSG_RESULT(no)
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370 fi
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371
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372 if test -z "$LTLD" -a "$cc_produces_so" = no; then
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373 AC_MSG_ERROR(no acceptable linker found in \$PATH)
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374 exit 1
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375 fi
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376 fi
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377
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378 dnl
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379 dnl Order of the tests changed somewhat to prevent repetition
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380 dnl
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381 ld_dynamic_link_flags=
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382
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383 # Check to see if it really is or isn't GNU ld.
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384 AC_MSG_CHECKING(if the linker is GNU ld)
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385 # I'd rather use --version here, but apparently some GNU ld's only accept -v.
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386 if $LTLD -v 2>&1 </dev/null | egrep '(GNU|with BFD)' 1>&5; then
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387 xe_gnu_ld=yes
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388 else
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389 xe_gnu_ld=no
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390 fi
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391 AC_MSG_RESULT([${xe_gnu_ld}])
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392
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393 case "$xehost_os" in
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394 amigaos* | sunos4*)
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395 # On these operating systems, we should treat GNU ld like the system ld.
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396 gnu_ld_acts_native=yes
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397 ;;
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398 *)
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399 gnu_ld_acts_native=no
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400 ;;
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401 esac
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402
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403 if test "$cc_produces_so" = "yes"; then
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404 dll_ld=$CC
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405 dll_ldflags=$xcldf
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406 can_build_shared=yes
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442
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407 ld_shlibs=yes
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388
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408 else
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409 # OK - only NOW do we futz about with ld.
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410 # See if the linker supports building shared libraries.
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411 AC_MSG_CHECKING(whether the linker supports shared libraries)
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412 dll_ld=$CC
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413 dll_ldflags=$LDFLAGS
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414 ld_shlibs=yes
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415 can_build_shared=yes
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416 if test "$xe_gnu_ld" = yes && test "$gnu_ld_acts_native" != yes; then
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417 # See if GNU ld supports shared libraries.
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418 if $LTLD --help 2>&1 | egrep ': supported targets:.* elf' > /dev/null; then
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419 dll_ld=$CC
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420 dll_ldflags="-shared"
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421 ld_shlibs=yes
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422 else
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423 ld_shlibs=no
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424 fi
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425 else
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426 # PORTME fill in a description of your system's linker (not GNU ld)
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427 case "$xehost_os" in
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428 aix3*)
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429 dll_ld=$LTLD
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430 dll_ldflags=$xldf
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431 ;;
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432
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460
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433 aix[[4-9]]*)
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388
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434 dll_ldflags=$xcldf
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435 ;;
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436
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437 # FreeBSD 2.2.[012] allows us to include c++rt0.o to get C++ constructor
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438 # support. Future versions do this automatically, but an explicit c++rt0.o
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439 # doesn't break anything, and helps significantly (at the cost of a little
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440 # extra space).
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441 freebsd2.2*)
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442 dll_ld=$LTLD
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443 dll_ldflags=$xldf
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444 dll_post="/usr/lib/c++rt0.o"
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445 ;;
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446
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447 # Unfortunately, older versions of FreeBSD 2 don't have this feature.
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448 freebsd2*)
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449 dll_ld=$LTLD
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450 dll_ldflags="-Bshareable"
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451 ;;
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265
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452
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388
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453 # FreeBSD 3, at last, uses gcc -shared to do shared libraries.
|
|
454 freebsd3*)
|
|
455 dll_ldflags="-shared"
|
|
456 ;;
|
|
457
|
|
458 hpux*)
|
|
459 dll_ld=$LTLD
|
|
460 dll_ldflags=$xldf
|
|
461 ;;
|
|
462
|
460
|
463 irix[[5-9]]*)
|
388
|
464 dll_ld=$LTLD
|
|
465 dll_ldflags=$xldf
|
|
466 ;;
|
|
467
|
|
468 netbsd*)
|
|
469 # Tested with NetBSD 1.2 ld
|
|
470 dll_ld=$LTLD
|
|
471 dll_ldflags=$xldf
|
|
472 ;;
|
|
473
|
|
474 openbsd*)
|
|
475 dll_ld=$LTLD
|
|
476 dll_ldflags=$xldf
|
|
477 ;;
|
|
478
|
|
479 osf3* | osf4*)
|
|
480 dll_ld=$LTLD
|
|
481 dll_ldflags=$xldf
|
|
482 ;;
|
|
483
|
|
484 # For both SCO and Solaris we MAY want to have LDFLAGS include -z text
|
|
485 sco3.2v5* | unixware* | sysv5* | sysv4* | solaris2* | solaris7*)
|
|
486 dll_ld=$LTLD
|
|
487 case "$dll_ld" in
|
|
488 *gcc*) dll_ldflags="-shared"
|
|
489 dll_ld=$CC
|
|
490 ;;
|
|
491 *) dll_ldflags="-G"
|
|
492 ;;
|
|
493 esac
|
|
494 ;;
|
|
495
|
|
496 sunos4*)
|
|
497 if test "$XEGCC" = yes; then
|
|
498 dll_ld=$CC
|
|
499 else
|
|
500 dll_ld=$LTLD
|
|
501 fi
|
|
502 dll_ldflags=$xldf
|
|
503 ;;
|
|
504
|
|
505 uts4*)
|
|
506 dll_ld=$LTLD
|
|
507 dll_ldflags="-G"
|
|
508 ;;
|
|
509
|
|
510 bsdi*)
|
|
511 dll_ldflags="-r"
|
|
512 dll_ld="shlicc2"
|
|
513 ;;
|
1470
|
514
|
388
|
515 *)
|
|
516 ld_shlibs=no
|
|
517 can_build_shared=no
|
|
518 ;;
|
|
519 esac
|
|
520 fi
|
|
521 AC_MSG_RESULT([${ld_shlibs}])
|
|
522 if test "$ld_shlibs" = "no"; then
|
|
523 can_build_shared=no
|
|
524 fi
|
|
525 fi # End of if cc_produces_so = no
|
265
|
526
|
388
|
527 dnl
|
|
528 dnl Last thing, check how to get a linked executable to have its symbols
|
|
529 dnl exported, so that the modules have access to them.
|
|
530 dnl
|
442
|
531 dnl XEmacs FIXME - we need to set ld_dynamic_link_flags properly for
|
388
|
532 dnl most of these systems, which was missing from libtool. I know they
|
|
533 dnl all have a way of doing this, but someone needs to look at this
|
|
534 dnl for each OS and make sure it is correct. Remember that the arguments
|
|
535 dnl are passed when temacs is linked, this is NOT for modules. The sole
|
|
536 dnl purpose of the argument is to get the internal XEmacs symbols exposed
|
|
537 dnl for modules to use. This means that the COMPILER (and NOT the linker)
|
|
538 dnl is most often used to create temacs, so arguments to the linker will
|
|
539 dnl usually need to be prefix with ${wl} or some other such thing.
|
|
540 dnl
|
|
541
|
|
542 if test "$xe_gnu_ld" = yes; then
|
|
543 if test "$ld_shlibs" = yes; then
|
|
544 ld_dynamic_link_flags="${wl}-export-dynamic"
|
|
545 fi
|
|
546 fi
|
|
547
|
|
548 if test -z "$ld_dynamic_link_flags"; then
|
|
549 case "$xehost_os" in
|
460
|
550 aix[[3-9]]*)
|
388
|
551 ld_dynamic_link_flags=
|
|
552 ;;
|
|
553
|
|
554 freebsd2.2*)
|
|
555 ld_dynamic_link_flags=
|
|
556 ;;
|
|
557
|
|
558 freebsd2*)
|
|
559 ld_dynamic_link_flags=
|
|
560 ;;
|
|
561
|
|
562 freebsd3*)
|
|
563 ld_dynamic_link_flags=
|
|
564 ;;
|
|
565
|
|
566 hpux*)
|
|
567 ld_dynamic_link_flags="${wl}-E"
|
|
568 ;;
|
|
569
|
460
|
570 irix[[5-9]]*)
|
388
|
571 ld_dynamic_link_flags=
|
|
572 ;;
|
|
573
|
|
574 netbsd*)
|
|
575 ld_dynamic_link_flags=
|
|
576 ;;
|
|
577
|
|
578 openbsd*)
|
|
579 ld_dynamic_link_flags=
|
|
580 ;;
|
|
581
|
|
582 osf3* | osf4*)
|
|
583 ld_dynamic_link_flags=
|
|
584 ;;
|
|
585
|
398
|
586 solaris2* | solaris7*)
|
426
|
587 ld_dynamic_link_flags=
|
398
|
588 ;;
|
|
589
|
|
590 sco3.2v5* | unixware* | sysv5* | sysv4*)
|
388
|
591 ld_dynamic_link_flags="${wl}-Bexport"
|
|
592 ;;
|
|
593
|
|
594 sunos4*)
|
|
595 ld_dynamic_link_flags=
|
|
596 ;;
|
|
597
|
|
598 uts4*)
|
|
599 ld_dynamic_link_flags=
|
|
600 ;;
|
|
601
|
|
602 bsdi*)
|
|
603 ld_dynamic_link_flags=
|
|
604 ;;
|
|
605
|
|
606 esac
|
|
607 fi # End of if -z ld_dynamic_link_flags
|
|
608 fi # End of if test "$can_build_shared" = "yes"
|
|
609
|
265
|
610 AC_SUBST(dll_ld)
|
|
611 AC_SUBST(dll_cflags)
|
388
|
612 AC_SUBST(dll_ldflags)
|
|
613 AC_SUBST(dll_post)
|
|
614 AC_SUBST(dll_ldo)
|
|
615 AC_SUBST(ld_dynamic_link_flags)
|
265
|
616 ])dnl
|
388
|
617
|