/[cvs]/eggdrop1.9/m4/lib-link.m4
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Contents of /eggdrop1.9/m4/lib-link.m4

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Revision 1.1 - (show annotations) (download)
Fri Mar 7 11:30:34 2003 UTC (16 years, 8 months ago) by tothwolf
Branch: MAIN
CVS Tags: HEAD
* Upgraded gettext to version 0.11.5.

1 # lib-link.m4 serial 3 (gettext-0.11.3)
2 dnl Copyright (C) 2001-2002 Free Software Foundation, Inc.
3 dnl This file is free software, distributed under the terms of the GNU
4 dnl General Public License. As a special exception to the GNU General
5 dnl Public License, this file may be distributed as part of a program
6 dnl that contains a configuration script generated by Autoconf, under
7 dnl the same distribution terms as the rest of that program.
8
9 dnl From Bruno Haible.
10
11 dnl AC_LIB_LINKFLAGS(name [, dependencies]) searches for libname and
12 dnl the libraries corresponding to explicit and implicit dependencies.
13 dnl Sets and AC_SUBSTs the LIB${NAME} and LTLIB${NAME} variables and
14 dnl augments the CPPFLAGS variable.
15 AC_DEFUN([AC_LIB_LINKFLAGS],
16 [
17 AC_REQUIRE([AC_LIB_PREPARE_PREFIX])
18 AC_REQUIRE([AC_LIB_RPATH])
19 define([Name],[translit([$1],[./-], [___])])
20 define([NAME],[translit([$1],[abcdefghijklmnopqrstuvwxyz./-],
21 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])])
22 AC_CACHE_CHECK([how to link with lib[]$1], [ac_cv_lib[]Name[]_libs], [
23 AC_LIB_LINKFLAGS_BODY([$1], [$2])
24 ac_cv_lib[]Name[]_libs="$LIB[]NAME"
25 ac_cv_lib[]Name[]_ltlibs="$LTLIB[]NAME"
26 ac_cv_lib[]Name[]_cppflags="$INC[]NAME"
27 ])
28 LIB[]NAME="$ac_cv_lib[]Name[]_libs"
29 LTLIB[]NAME="$ac_cv_lib[]Name[]_ltlibs"
30 INC[]NAME="$ac_cv_lib[]Name[]_cppflags"
31 AC_LIB_APPENDTOVAR([CPPFLAGS], [$INC]NAME)
32 AC_SUBST([LIB]NAME)
33 AC_SUBST([LTLIB]NAME)
34 dnl Also set HAVE_LIB[]NAME so that AC_LIB_HAVE_LINKFLAGS can reuse the
35 dnl results of this search when this library appears as a dependency.
36 HAVE_LIB[]NAME=yes
37 undefine([Name])
38 undefine([NAME])
39 ])
40
41 dnl AC_LIB_HAVE_LINKFLAGS(name, dependencies, includes, testcode)
42 dnl searches for libname and the libraries corresponding to explicit and
43 dnl implicit dependencies, together with the specified include files and
44 dnl the ability to compile and link the specified testcode. If found, it
45 dnl sets and AC_SUBSTs HAVE_LIB${NAME}=yes and the LIB${NAME} and
46 dnl LTLIB${NAME} variables and augments the CPPFLAGS variable, and
47 dnl #defines HAVE_LIB${NAME} to 1. Otherwise, it sets and AC_SUBSTs
48 dnl HAVE_LIB${NAME}=no and LIB${NAME} and LTLIB${NAME} to empty.
49 AC_DEFUN([AC_LIB_HAVE_LINKFLAGS],
50 [
51 AC_REQUIRE([AC_LIB_PREPARE_PREFIX])
52 AC_REQUIRE([AC_LIB_RPATH])
53 define([Name],[translit([$1],[./-], [___])])
54 define([NAME],[translit([$1],[abcdefghijklmnopqrstuvwxyz./-],
55 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])])
56
57 dnl Search for lib[]Name and define LIB[]NAME, LTLIB[]NAME and INC[]NAME
58 dnl accordingly.
59 AC_LIB_LINKFLAGS_BODY([$1], [$2])
60
61 dnl Add $INC[]NAME to CPPFLAGS before performing the following checks,
62 dnl because if the user has installed lib[]Name and not disabled its use
63 dnl via --without-lib[]Name-prefix, he wants to use it.
64 ac_save_CPPFLAGS="$CPPFLAGS"
65 AC_LIB_APPENDTOVAR([CPPFLAGS], [$INC]NAME)
66
67 AC_CACHE_CHECK([for lib[]$1], [ac_cv_lib[]Name], [
68 ac_save_LIBS="$LIBS"
69 LIBS="$LIBS $LIB[]NAME"
70 AC_TRY_LINK([$3], [$4], [ac_cv_lib[]Name=yes], [ac_cv_lib[]Name=no])
71 LIBS="$ac_save_LIBS"
72 ])
73 if test "$ac_cv_lib[]Name" = yes; then
74 HAVE_LIB[]NAME=yes
75 AC_DEFINE([HAVE_LIB]NAME, 1, [Define if you have the $1 library.])
76 AC_MSG_CHECKING([how to link with lib[]$1])
77 AC_MSG_RESULT([$LIB[]NAME])
78 else
79 HAVE_LIB[]NAME=no
80 dnl If $LIB[]NAME didn't lead to a usable library, we don't need
81 dnl $INC[]NAME either.
82 CPPFLAGS="$ac_save_CPPFLAGS"
83 LIB[]NAME=
84 LTLIB[]NAME=
85 fi
86 AC_SUBST([HAVE_LIB]NAME)
87 AC_SUBST([LIB]NAME)
88 AC_SUBST([LTLIB]NAME)
89 undefine([Name])
90 undefine([NAME])
91 ])
92
93 dnl Determine the platform dependent parameters needed to use rpath:
94 dnl libext, shlibext, hardcode_libdir_flag_spec, hardcode_libdir_separator,
95 dnl hardcode_direct, hardcode_minus_L,
96 dnl sys_lib_search_path_spec, sys_lib_dlsearch_path_spec.
97 AC_DEFUN([AC_LIB_RPATH],
98 [
99 AC_REQUIRE([AC_PROG_CC]) dnl we use $CC, $GCC, $LDFLAGS
100 AC_REQUIRE([AC_LIB_PROG_LD]) dnl we use $LD, $with_gnu_ld
101 AC_REQUIRE([AC_CANONICAL_HOST]) dnl we use $host
102 AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT]) dnl we use $ac_aux_dir
103 AC_CACHE_CHECK([for shared library run path origin], acl_cv_rpath, [
104 CC="$CC" GCC="$GCC" LDFLAGS="$LDFLAGS" LD="$LD" with_gnu_ld="$with_gnu_ld" \
105 ${CONFIG_SHELL-/bin/sh} "$ac_aux_dir/config.rpath" "$host" > conftest.sh
106 . ./conftest.sh
107 rm -f ./conftest.sh
108 acl_cv_rpath=done
109 ])
110 wl="$acl_cv_wl"
111 libext="$acl_cv_libext"
112 shlibext="$acl_cv_shlibext"
113 hardcode_libdir_flag_spec="$acl_cv_hardcode_libdir_flag_spec"
114 hardcode_libdir_separator="$acl_cv_hardcode_libdir_separator"
115 hardcode_direct="$acl_cv_hardcode_direct"
116 hardcode_minus_L="$acl_cv_hardcode_minus_L"
117 sys_lib_search_path_spec="$acl_cv_sys_lib_search_path_spec"
118 sys_lib_dlsearch_path_spec="$acl_cv_sys_lib_dlsearch_path_spec"
119 dnl Determine whether the user wants rpath handling at all.
120 AC_ARG_ENABLE(rpath,
121 [ --disable-rpath do not hardcode runtime library paths],
122 :, enable_rpath=yes)
123 ])
124
125 dnl AC_LIB_LINKFLAGS_BODY(name [, dependencies]) searches for libname and
126 dnl the libraries corresponding to explicit and implicit dependencies.
127 dnl Sets the LIB${NAME}, LTLIB${NAME} and INC${NAME} variables.
128 AC_DEFUN([AC_LIB_LINKFLAGS_BODY],
129 [
130 define([NAME],[translit([$1],[abcdefghijklmnopqrstuvwxyz./-],
131 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])])
132 dnl By default, look in $includedir and $libdir.
133 use_additional=yes
134 AC_LIB_WITH_FINAL_PREFIX([
135 eval additional_includedir=\"$includedir\"
136 eval additional_libdir=\"$libdir\"
137 ])
138 AC_ARG_WITH([lib$1-prefix],
139 [ --with-lib$1-prefix[=DIR] search for lib$1 in DIR/include and DIR/lib
140 --without-lib$1-prefix don't search for lib$1 in includedir and libdir],
141 [
142 if test "X$withval" = "Xno"; then
143 use_additional=no
144 else
145 if test "X$withval" = "X"; then
146 AC_LIB_WITH_FINAL_PREFIX([
147 eval additional_includedir=\"$includedir\"
148 eval additional_libdir=\"$libdir\"
149 ])
150 else
151 additional_includedir="$withval/include"
152 additional_libdir="$withval/lib"
153 fi
154 fi
155 ])
156 dnl Search the library and its dependencies in $additional_libdir and
157 dnl $LDFLAGS. Using breadth-first-seach.
158 LIB[]NAME=
159 LTLIB[]NAME=
160 INC[]NAME=
161 rpathdirs=
162 ltrpathdirs=
163 names_already_handled=
164 names_next_round='$1 $2'
165 while test -n "$names_next_round"; do
166 names_this_round="$names_next_round"
167 names_next_round=
168 for name in $names_this_round; do
169 already_handled=
170 for n in $names_already_handled; do
171 if test "$n" = "$name"; then
172 already_handled=yes
173 break
174 fi
175 done
176 if test -z "$already_handled"; then
177 names_already_handled="$names_already_handled $name"
178 dnl See if it was already located by an earlier AC_LIB_LINKFLAGS
179 dnl or AC_LIB_HAVE_LINKFLAGS call.
180 uppername=`echo "$name" | sed -e 'y|abcdefghijklmnopqrstuvwxyz./-|ABCDEFGHIJKLMNOPQRSTUVWXYZ___|'`
181 eval value=\"\$HAVE_LIB$uppername\"
182 if test -n "$value"; then
183 if test "$value" = yes; then
184 eval value=\"\$LIB$uppername\"
185 test -z "$value" || LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$value"
186 eval value=\"\$LTLIB$uppername\"
187 test -z "$value" || LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }$value"
188 else
189 dnl An earlier call to AC_LIB_HAVE_LINKFLAGS has determined
190 dnl that this library doesn't exist. So just drop it.
191 :
192 fi
193 else
194 dnl Search the library lib$name in $additional_libdir and $LDFLAGS
195 dnl and the already constructed $LIBNAME/$LTLIBNAME.
196 found_dir=
197 found_la=
198 found_so=
199 found_a=
200 if test $use_additional = yes; then
201 if test -n "$shlibext" && test -f "$additional_libdir/lib$name.$shlibext"; then
202 found_dir="$additional_libdir"
203 found_so="$additional_libdir/lib$name.$shlibext"
204 if test -f "$additional_libdir/lib$name.la"; then
205 found_la="$additional_libdir/lib$name.la"
206 fi
207 else
208 if test -f "$additional_libdir/lib$name.$libext"; then
209 found_dir="$additional_libdir"
210 found_a="$additional_libdir/lib$name.$libext"
211 if test -f "$additional_libdir/lib$name.la"; then
212 found_la="$additional_libdir/lib$name.la"
213 fi
214 fi
215 fi
216 fi
217 if test "X$found_dir" = "X"; then
218 for x in $LDFLAGS $LTLIB[]NAME; do
219 AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
220 case "$x" in
221 -L*)
222 dir=`echo "X$x" | sed -e 's/^X-L//'`
223 if test -n "$shlibext" && test -f "$dir/lib$name.$shlibext"; then
224 found_dir="$dir"
225 found_so="$dir/lib$name.$shlibext"
226 if test -f "$dir/lib$name.la"; then
227 found_la="$dir/lib$name.la"
228 fi
229 else
230 if test -f "$dir/lib$name.$libext"; then
231 found_dir="$dir"
232 found_a="$dir/lib$name.$libext"
233 if test -f "$dir/lib$name.la"; then
234 found_la="$dir/lib$name.la"
235 fi
236 fi
237 fi
238 ;;
239 esac
240 if test "X$found_dir" != "X"; then
241 break
242 fi
243 done
244 fi
245 if test "X$found_dir" != "X"; then
246 dnl Found the library.
247 LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-L$found_dir -l$name"
248 if test "X$found_so" != "X"; then
249 dnl Linking with a shared library. We attempt to hardcode its
250 dnl directory into the executable's runpath, unless it's the
251 dnl standard /usr/lib.
252 if test "$enable_rpath" = no || test "X$found_dir" = "X/usr/lib"; then
253 dnl No hardcoding is needed.
254 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_so"
255 else
256 dnl Use an explicit option to hardcode DIR into the resulting
257 dnl binary.
258 dnl Potentially add DIR to ltrpathdirs.
259 dnl The ltrpathdirs will be appended to $LTLIBNAME at the end.
260 haveit=
261 for x in $ltrpathdirs; do
262 if test "X$x" = "X$found_dir"; then
263 haveit=yes
264 break
265 fi
266 done
267 if test -z "$haveit"; then
268 ltrpathdirs="$ltrpathdirs $found_dir"
269 fi
270 dnl The hardcoding into $LIBNAME is system dependent.
271 if test "$hardcode_direct" = yes; then
272 dnl Using DIR/libNAME.so during linking hardcodes DIR into the
273 dnl resulting binary.
274 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_so"
275 else
276 if test -n "$hardcode_libdir_flag_spec" && test "$hardcode_minus_L" = no; then
277 dnl Use an explicit option to hardcode DIR into the resulting
278 dnl binary.
279 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_so"
280 dnl Potentially add DIR to rpathdirs.
281 dnl The rpathdirs will be appended to $LIBNAME at the end.
282 haveit=
283 for x in $rpathdirs; do
284 if test "X$x" = "X$found_dir"; then
285 haveit=yes
286 break
287 fi
288 done
289 if test -z "$haveit"; then
290 rpathdirs="$rpathdirs $found_dir"
291 fi
292 else
293 dnl Rely on "-L$found_dir".
294 dnl But don't add it if it's already contained in the LDFLAGS
295 dnl or the already constructed $LIBNAME
296 haveit=
297 for x in $LDFLAGS $LIB[]NAME; do
298 AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
299 if test "X$x" = "X-L$found_dir"; then
300 haveit=yes
301 break
302 fi
303 done
304 if test -z "$haveit"; then
305 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-L$found_dir"
306 fi
307 if test "$hardcode_minus_L" != no; then
308 dnl FIXME: Not sure whether we should use
309 dnl "-L$found_dir -l$name" or "-L$found_dir $found_so"
310 dnl here.
311 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_so"
312 else
313 dnl We cannot use $hardcode_runpath_var and LD_RUN_PATH
314 dnl here, because this doesn't fit in flags passed to the
315 dnl compiler. So give up. No hardcoding. This affects only
316 dnl very old systems.
317 dnl FIXME: Not sure whether we should use
318 dnl "-L$found_dir -l$name" or "-L$found_dir $found_so"
319 dnl here.
320 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-l$name"
321 fi
322 fi
323 fi
324 fi
325 else
326 if test "X$found_a" != "X"; then
327 dnl Linking with a static library.
328 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_a"
329 else
330 dnl We shouldn't come here, but anyway it's good to have a
331 dnl fallback.
332 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-L$found_dir -l$name"
333 fi
334 fi
335 dnl Assume the include files are nearby.
336 additional_includedir=
337 case "$found_dir" in
338 */lib | */lib/)
339 basedir=`echo "X$found_dir" | sed -e 's,^X,,' -e 's,/lib/*$,,'`
340 additional_includedir="$basedir/include"
341 ;;
342 esac
343 if test "X$additional_includedir" != "X"; then
344 dnl Potentially add $additional_includedir to $INCNAME.
345 dnl But don't add it
346 dnl 1. if it's the standard /usr/include,
347 dnl 2. if it's /usr/local/include and we are using GCC on Linux,
348 dnl 3. if it's already present in $CPPFLAGS or the already
349 dnl constructed $INCNAME,
350 dnl 4. if it doesn't exist as a directory.
351 if test "X$additional_includedir" != "X/usr/include"; then
352 haveit=
353 if test "X$additional_includedir" = "X/usr/local/include"; then
354 if test -n "$GCC"; then
355 case $host_os in
356 linux*) haveit=yes;;
357 esac
358 fi
359 fi
360 if test -z "$haveit"; then
361 for x in $CPPFLAGS $INC[]NAME; do
362 AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
363 if test "X$x" = "X-I$additional_includedir"; then
364 haveit=yes
365 break
366 fi
367 done
368 if test -z "$haveit"; then
369 if test -d "$additional_includedir"; then
370 dnl Really add $additional_includedir to $INCNAME.
371 INC[]NAME="${INC[]NAME}${INC[]NAME:+ }-I$additional_includedir"
372 fi
373 fi
374 fi
375 fi
376 fi
377 dnl Look for dependencies.
378 if test -n "$found_la"; then
379 dnl Read the .la file. It defines the variables
380 dnl dlname, library_names, old_library, dependency_libs, current,
381 dnl age, revision, installed, dlopen, dlpreopen, libdir.
382 save_libdir="$libdir"
383 case "$found_la" in
384 */* | *\\*) . "$found_la" ;;
385 *) . "./$found_la" ;;
386 esac
387 libdir="$save_libdir"
388 dnl We use only dependency_libs.
389 for dep in $dependency_libs; do
390 case "$dep" in
391 -L*)
392 additional_libdir=`echo "X$dep" | sed -e 's/^X-L//'`
393 dnl Potentially add $additional_libdir to $LIBNAME and $LTLIBNAME.
394 dnl But don't add it
395 dnl 1. if it's the standard /usr/lib,
396 dnl 2. if it's /usr/local/lib and we are using GCC on Linux,
397 dnl 3. if it's already present in $LDFLAGS or the already
398 dnl constructed $LIBNAME,
399 dnl 4. if it doesn't exist as a directory.
400 if test "X$additional_libdir" != "X/usr/lib"; then
401 haveit=
402 if test "X$additional_libdir" = "X/usr/local/lib"; then
403 if test -n "$GCC"; then
404 case $host_os in
405 linux*) haveit=yes;;
406 esac
407 fi
408 fi
409 if test -z "$haveit"; then
410 haveit=
411 for x in $LDFLAGS $LIB[]NAME; do
412 AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
413 if test "X$x" = "X-L$additional_libdir"; then
414 haveit=yes
415 break
416 fi
417 done
418 if test -z "$haveit"; then
419 if test -d "$additional_libdir"; then
420 dnl Really add $additional_libdir to $LIBNAME.
421 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-L$additional_libdir"
422 fi
423 fi
424 haveit=
425 for x in $LDFLAGS $LTLIB[]NAME; do
426 AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
427 if test "X$x" = "X-L$additional_libdir"; then
428 haveit=yes
429 break
430 fi
431 done
432 if test -z "$haveit"; then
433 if test -d "$additional_libdir"; then
434 dnl Really add $additional_libdir to $LTLIBNAME.
435 LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-L$additional_libdir"
436 fi
437 fi
438 fi
439 fi
440 ;;
441 -R*)
442 dir=`echo "X$dep" | sed -e 's/^X-R//'`
443 if test "$enable_rpath" != no; then
444 dnl Potentially add DIR to rpathdirs.
445 dnl The rpathdirs will be appended to $LIBNAME at the end.
446 haveit=
447 for x in $rpathdirs; do
448 if test "X$x" = "X$dir"; then
449 haveit=yes
450 break
451 fi
452 done
453 if test -z "$haveit"; then
454 rpathdirs="$rpathdirs $dir"
455 fi
456 dnl Potentially add DIR to ltrpathdirs.
457 dnl The ltrpathdirs will be appended to $LTLIBNAME at the end.
458 haveit=
459 for x in $ltrpathdirs; do
460 if test "X$x" = "X$dir"; then
461 haveit=yes
462 break
463 fi
464 done
465 if test -z "$haveit"; then
466 ltrpathdirs="$ltrpathdirs $dir"
467 fi
468 fi
469 ;;
470 -l*)
471 dnl Handle this in the next round.
472 names_next_round="$names_next_round "`echo "X$dep" | sed -e 's/^X-l//'`
473 ;;
474 *.la)
475 dnl Handle this in the next round. Throw away the .la's
476 dnl directory; it is already contained in a preceding -L
477 dnl option.
478 names_next_round="$names_next_round "`echo "X$dep" | sed -e 's,^X.*/,,' -e 's,^lib,,' -e 's,\.la$,,'`
479 ;;
480 *)
481 dnl Most likely an immediate library name.
482 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$dep"
483 LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }$dep"
484 ;;
485 esac
486 done
487 fi
488 else
489 dnl Didn't find the library; assume it is in the system directories
490 dnl known to the linker and runtime loader. (All the system
491 dnl directories known to the linker should also be known to the
492 dnl runtime loader, otherwise the system is severely misconfigured.)
493 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-l$name"
494 LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-l$name"
495 fi
496 fi
497 fi
498 done
499 done
500 if test "X$rpathdirs" != "X"; then
501 if test -n "$hardcode_libdir_separator"; then
502 dnl Weird platform: only the last -rpath option counts, the user must
503 dnl pass all path elements in one option. We can arrange that for a
504 dnl single library, but not when more than one $LIBNAMEs are used.
505 alldirs=
506 for found_dir in $rpathdirs; do
507 alldirs="${alldirs}${alldirs:+$hardcode_libdir_separator}$found_dir"
508 done
509 dnl Note: hardcode_libdir_flag_spec uses $libdir and $wl.
510 acl_save_libdir="$libdir"
511 libdir="$alldirs"
512 eval flag=\"$hardcode_libdir_flag_spec\"
513 libdir="$acl_save_libdir"
514 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$flag"
515 else
516 dnl The -rpath options are cumulative.
517 for found_dir in $rpathdirs; do
518 acl_save_libdir="$libdir"
519 libdir="$found_dir"
520 eval flag=\"$hardcode_libdir_flag_spec\"
521 libdir="$acl_save_libdir"
522 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$flag"
523 done
524 fi
525 fi
526 if test "X$ltrpathdirs" != "X"; then
527 dnl When using libtool, the option that works for both libraries and
528 dnl executables is -R. The -R options are cumulative.
529 for found_dir in $ltrpathdirs; do
530 LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-R$found_dir"
531 done
532 fi
533 ])
534
535 dnl AC_LIB_APPENDTOVAR(VAR, CONTENTS) appends the elements of CONTENTS to VAR,
536 dnl unless already present in VAR.
537 dnl Works only for CPPFLAGS, not for LIB* variables because that sometimes
538 dnl contains two or three consecutive elements that belong together.
539 AC_DEFUN([AC_LIB_APPENDTOVAR],
540 [
541 for element in [$2]; do
542 haveit=
543 for x in $[$1]; do
544 AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
545 if test "X$x" = "X$element"; then
546 haveit=yes
547 break
548 fi
549 done
550 if test -z "$haveit"; then
551 [$1]="${[$1]}${[$1]:+ }$element"
552 fi
553 done
554 ])

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