3 ?RCS: Copyright (c) 1996-1998, Andy Dougherty
5 ?RCS: You may distribute under the terms of either the GNU General Public
6 ?RCS: License or the Artistic License, as specified in the README file.
8 ?RCS: $Log: dlsrc.U,v $
10 ?X: hpux support thanks to Jeff Okamoto <okamoto@hpcc101.corp.hp.com>
12 ?X: To create a shared library, you must compile ALL source files in the
13 ?X: library with +z (or possibly +Z if the library is whopping huge),
14 ?X: then link the library with -b. Example:
15 ?X: cc -c +z module_a.c
16 ?X: cc -c +z module_b.c
17 ?X: ld -b module_a.o module_b.o -o module.sl
19 ?MAKE:usedl ld dlsrc cccdlflags lddlflags ccdlflags bin_ELF ld_can_script: \
20 rm_try Getfile Myread test osname sed d_dlopen Findhdr Setvar \
21 src run cc ccflags ldflags optimize ls gccversion cat rsrc i_stdlib \
23 ?MAKE: -pick add $@ %<
26 ?S: This variable indicates if the system supports dynamic
27 ?S: loading of some sort. See also dlsrc and dlobj.
30 ?S: This variable indicates the program to be used to link
31 ?S: libraries for dynamic loading. On some systems, it is 'ld'.
32 ?S: On ELF systems, it should be $cc. Mostly, we'll try to respect
33 ?S: the hint file setting.
36 ?S: This variable contains the name of the dynamic loading file that
37 ?S: will be used with the package.
40 ?S: This variable contains any special flags that might need to be
41 ?S: passed with 'cc -c' to compile modules to be used to create a shared
42 ?S: library that will be used for dynamic loading. For hpux, this
43 ?S: should be +z. It is up to the makefile to use it.
46 ?S: This variable contains any special flags that might need to be
47 ?S: passed to $ld to create a shared library suitable for dynamic
48 ?S: loading. It is up to the makefile to use it. For hpux, it
49 ?S: should be '-b'. For sunos 4.1, it is empty.
52 ?S: This variable contains any special flags that might need to be
53 ?S: passed to cc to link with a shared library for dynamic loading.
54 ?S: It is up to the makefile to use it. For sunos 4.1, it should
58 ?S: This variable saves the result from configure if generated binaries
59 ?S: are in ELF format. Only set to defined when the test has actually
60 ?S: been performed, and the result was positive.
63 ?S: This variable shows if the loader accepts scripts in the form of
64 ?S: -Wl,--version-script=ld.script. This is currently only supported
65 ?S: for GNU ld on ELF in dynamic loading builds.
67 ?C:USE_DYNAMIC_LOADING ~ %<:
68 ?C: This symbol, if defined, indicates that dynamic loading of
69 ?C: some sort is available.
71 ?H:?%<:#$usedl USE_DYNAMIC_LOADING /**/
74 ?T:dldir thisflag tdir
76 : determine which dynamic loading, if any, to compile in
78 dldir="ext/DynaLoader"
93 : Does a dl_xxx.xs file exist for this operating system
94 $test -f $rsrc/$dldir/dl_${osname}.xs && dflt='y'
97 rp="Do you wish to use dynamic loading?"
105 if $test -f $rsrc/$dldir/dl_${osname}.xs ; then
106 dflt="$dldir/dl_${osname}.xs"
107 elif $test "$d_dlopen" = "$define" ; then
108 dflt="$dldir/dl_dlopen.xs"
113 *) dflt="$dldir/$dlsrc"
116 echo "The following dynamic loading files are available:"
117 : Can not go over to $dldir because getfile has path hard-coded in.
118 tdir=`pwd`; cd "$rsrc"; $ls -C $dldir/dl*.xs; cd "$tdir"
119 rp="Source file to use for dynamic loading"
125 dlsrc=`echo $ans | $sed -e 's%.*/\([^/]*\)$%\1%'`
129 Some systems may require passing special flags to $cc -c to
130 compile modules that will be used to create a shared library.
131 To use no flags, say "none".
134 case "$cccdlflags" in
135 '') case "$gccversion" in
136 '') case "$osname" in
139 irix*) dflt='-KPIC' ;;
140 svr4*|esix*|solaris|nonstopux) dflt='-KPIC' ;;
141 sunos) dflt='-pic' ;;
146 darwin) dflt='none' ;;
147 linux*|svr4*|esix*|solaris|nonstopux) dflt='-fPIC' ;;
152 *) dflt="$cccdlflags" ;;
154 rp="Any special flags to pass to $cc -c to compile shared library modules?"
157 ?X: Use ' ' so that a subsequent Configure run preserves the old state.
158 none) cccdlflags=' ' ;;
159 *) cccdlflags="$ans" ;;
164 Some systems use ld to create libraries that can be dynamically loaded,
165 while other systems (such as those using ELF) use $cc.
169 : Determine if this is ELF
171 /* Test for whether ELF binaries are produced */
183 int i = open("a.out",O_RDONLY);
186 if(read(i,b,4)==4 && b[0]==127 && b[1]=='E' && b[2]=='L' && b[3]=='F')
187 exit(0); /* succeed (yes, it is ELF) */
192 if $cc $ccflags $ldflags try.c >/dev/null 2>&1 && $run ./a.out; then
198 '') if $test $bin_ELF = "$define"; then
200 You appear to have ELF support. I'll use $cc to build dynamic libraries.
204 echo "I'll use ld to build dynamic libraries."
212 rp="What command should be used to create dynamic libraries?"
218 Some systems may require passing special flags to $ld to create a
219 library that can be dynamically loaded. If your ld flags include
220 -L/other/path options to locate libraries outside your loader's normal
221 search path, you may need to specify those -L options here as well. To
222 use no flags, say "none".
226 '') case "$osname" in
227 haiku) dflt='-shared' ;;
229 case "$gccversion" in
230 '') dflt="$dflt +vnocompatwarnings" ;;
233 linux|irix*|gnu*) dflt="-shared $optimize" ;;
235 solaris) # See [perl #66604].
236 # On Solaris 11, gcc -m64 on amd64
237 # appears not to understand -G. gcc versions at
238 # least as old as 3.4.3 support -shared, so just
239 # use that with Solaris 11 and later, but keep
240 # the old behavior for older Solaris versions.
241 case "$gccversion" in
244 2.?|2.10) dflt='-G' ;;
250 sunos) dflt='-assert nodefinitions' ;;
251 svr4*|esix*|nonstopux) dflt="-G $ldflags" ;;
255 *) dflt="$lddlflags" ;;
258 : Try to guess additional flags to pick up local libraries.
259 : Be careful not to append to a plain 'none'
263 for thisflag in $ldflags; do
268 *) dflt="$dflt $thisflag" ;;
275 ''|' ') dflt='none' ;;
281 *-fstack-protector*) ;; # Don't add it again
282 *) dflt="$dflt -fstack-protector" ;;
288 rp="Any special flags to pass to $ld to create a dynamically loaded library?"
291 ?X: Use ' ' so that a subsequent Configure run preserves the old state.
292 none) lddlflags=' ' ;;
293 *) lddlflags="$ans" ;;
298 Some systems may require passing special flags to $cc to indicate that
299 the resulting executable will use dynamic linking. To use no flags,
304 '') case "$osname" in
305 linux|hpux|gnu*) dflt='-Wl,-E' ;;
306 next|sunos) dflt='none' ;;
310 *) dflt="$ccdlflags" ;;
312 rp="Any special flags to pass to $cc to use dynamic linking?"
315 ?X: Use ' ' so that a subsequent Configure run preserves the old state.
316 none) ccdlflags=' ' ;;
317 *) ccdlflags="$ans" ;;
320 ?X: End of usedl=y section
329 ld_can_script="$undef"
330 case "$bin_ELF$usedl" in
332 # Abuse try.h and a.out names for neat cleanup
344 if $cc $cccdlflags $ccdlflags $ccflags \
345 $ldflags $lddlflags -o a.out try.c \
346 -Wl,--version-script=try.h >/dev/null 2>&1 \
347 && $test -s a.out ; then
348 echo "ld supports scripting" >&4
349 ld_can_script="$define"
351 echo "ld does not support scripting" >&4