1# This file is part of Autoconf.                       -*- Autoconf -*-
2# Checking for libraries.
3# Copyright (C) 1992-1996, 1998-2006, 2008-2012 Free Software
4# Foundation, Inc.
5
6# This file is part of Autoconf.  This program is free
7# software; you can redistribute it and/or modify it under the
8# terms of the GNU General Public License as published by the
9# Free Software Foundation, either version 3 of the License, or
10# (at your option) any later version.
11#
12# This program is distributed in the hope that it will be useful,
13# but WITHOUT ANY WARRANTY; without even the implied warranty of
14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15# GNU General Public License for more details.
16#
17# Under Section 7 of GPL version 3, you are granted additional
18# permissions described in the Autoconf Configure Script Exception,
19# version 3.0, as published by the Free Software Foundation.
20#
21# You should have received a copy of the GNU General Public License
22# and a copy of the Autoconf Configure Script Exception along with
23# this program; see the files COPYINGv3 and COPYING.EXCEPTION
24# respectively.  If not, see <http://www.gnu.org/licenses/>.
25
26# Written by David MacKenzie, with help from
27# Franc,ois Pinard, Karl Berry, Richard Pixley, Ian Lance Taylor,
28# Roland McGrath, Noah Friedman, david d zuhn, and many others.
29
30# Table of contents
31#
32# 1. Generic tests for libraries
33# 2. Tests for specific libraries
34
35
36## --------------------------------- ##
37## 1. Generic tests for libraries.## ##
38## --------------------------------- ##
39
40
41
42# AC_SEARCH_LIBS(FUNCTION, SEARCH-LIBS,
43#                [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
44#                [OTHER-LIBRARIES])
45# --------------------------------------------------------
46# Search for a library defining FUNC, if it's not already available.
47AC_DEFUN([AC_SEARCH_LIBS],
48[AS_VAR_PUSHDEF([ac_Search], [ac_cv_search_$1])dnl
49AC_CACHE_CHECK([for library containing $1], [ac_Search],
50[ac_func_search_save_LIBS=$LIBS
51AC_LANG_CONFTEST([AC_LANG_CALL([], [$1])])
52for ac_lib in '' $2; do
53  if test -z "$ac_lib"; then
54    ac_res="none required"
55  else
56    ac_res=-l$ac_lib
57    LIBS="-l$ac_lib $5 $ac_func_search_save_LIBS"
58  fi
59  AC_LINK_IFELSE([], [AS_VAR_SET([ac_Search], [$ac_res])])
60  AS_VAR_SET_IF([ac_Search], [break])
61done
62AS_VAR_SET_IF([ac_Search], , [AS_VAR_SET([ac_Search], [no])])
63rm conftest.$ac_ext
64LIBS=$ac_func_search_save_LIBS])
65AS_VAR_COPY([ac_res], [ac_Search])
66AS_IF([test "$ac_res" != no],
67  [test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
68  $3],
69      [$4])
70AS_VAR_POPDEF([ac_Search])dnl
71])
72
73
74
75# AC_CHECK_LIB(LIBRARY, FUNCTION,
76#              [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
77#              [OTHER-LIBRARIES])
78# ------------------------------------------------------
79#
80# Use a cache variable name containing both the library and function name,
81# because the test really is for library $1 defining function $2, not
82# just for library $1.  Separate tests with the same $1 and different $2s
83# may have different results.
84#
85# Note that using directly AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1_$2])
86# is asking for troubles, since AC_CHECK_LIB($lib, fun) would give
87# ac_cv_lib_$lib_fun, which is definitely not what was meant.  Hence
88# the AS_LITERAL_IF indirection.
89#
90# FIXME: This macro is extremely suspicious.  It DEFINEs unconditionally,
91# whatever the FUNCTION, in addition to not being a *S macro.  Note
92# that the cache does depend upon the function we are looking for.
93#
94# It is on purpose we used `ac_check_lib_save_LIBS' and not just
95# `ac_save_LIBS': there are many macros which don't want to see `LIBS'
96# changed but still want to use AC_CHECK_LIB, so they save `LIBS'.
97# And ``ac_save_LIBS' is too tempting a name, so let's leave them some
98# freedom.
99AC_DEFUN([AC_CHECK_LIB],
100[m4_ifval([$3], , [AH_CHECK_LIB([$1])])dnl
101AS_LITERAL_WORD_IF([$1],
102	      [AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1_$2])],
103	      [AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1''_$2])])dnl
104AC_CACHE_CHECK([for $2 in -l$1], [ac_Lib],
105[ac_check_lib_save_LIBS=$LIBS
106LIBS="-l$1 $5 $LIBS"
107AC_LINK_IFELSE([AC_LANG_CALL([], [$2])],
108	       [AS_VAR_SET([ac_Lib], [yes])],
109	       [AS_VAR_SET([ac_Lib], [no])])
110LIBS=$ac_check_lib_save_LIBS])
111AS_VAR_IF([ac_Lib], [yes],
112      [m4_default([$3], [AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_LIB$1))
113  LIBS="-l$1 $LIBS"
114])],
115      [$4])
116AS_VAR_POPDEF([ac_Lib])dnl
117])# AC_CHECK_LIB
118
119
120# AH_CHECK_LIB(LIBNAME)
121# ---------------------
122m4_define([AH_CHECK_LIB],
123[AH_TEMPLATE(AS_TR_CPP([HAVE_LIB$1]),
124	     [Define to 1 if you have the `$1' library (-l$1).])])
125
126
127# AC_HAVE_LIBRARY(LIBRARY,
128#                 [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
129#                 [OTHER-LIBRARIES])
130# ---------------------------------------------------------
131#
132# This macro is equivalent to calling `AC_CHECK_LIB' with a FUNCTION
133# argument of `main'.  In addition, LIBRARY can be written as any of
134# `foo', `-lfoo', or `libfoo.a'.  In all of those cases, the compiler
135# is passed `-lfoo'.  However, LIBRARY cannot be a shell variable;
136# it must be a literal name.
137AU_DEFUN([AC_HAVE_LIBRARY],
138[m4_pushdef([AC_Lib_Name],
139	    m4_bpatsubst(m4_bpatsubst([[$1]],
140				    [lib\([^\.]*\)\.a], [\1]),
141			[-l], []))dnl
142AC_CHECK_LIB(AC_Lib_Name, main, [$2], [$3], [$4])dnl
143ac_cv_lib_[]AC_Lib_Name()=ac_cv_lib_[]AC_Lib_Name()_main
144m4_popdef([AC_Lib_Name])dnl
145])
146
147
148
149
150## --------------------------------- ##
151## 2. Tests for specific libraries.  ##
152## --------------------------------- ##
153
154
155
156# --------------------- #
157# Checks for X window.  #
158# --------------------- #
159
160
161# _AC_PATH_X_XMKMF
162# ----------------
163# Internal subroutine of _AC_PATH_X.
164# Set ac_x_includes and/or ac_x_libraries.
165m4_define([_AC_PATH_X_XMKMF],
166[AC_ARG_VAR(XMKMF, [Path to xmkmf, Makefile generator for X Window System])dnl
167rm -f -r conftest.dir
168if mkdir conftest.dir; then
169  cd conftest.dir
170  cat >Imakefile <<'_ACEOF'
171incroot:
172	@echo incroot='${INCROOT}'
173usrlibdir:
174	@echo usrlibdir='${USRLIBDIR}'
175libdir:
176	@echo libdir='${LIBDIR}'
177_ACEOF
178  if (export CC; ${XMKMF-xmkmf}) >/dev/null 2>/dev/null && test -f Makefile; then
179    # GNU make sometimes prints "make[1]: Entering ...", which would confuse us.
180    for ac_var in incroot usrlibdir libdir; do
181      eval "ac_im_$ac_var=\`\${MAKE-make} $ac_var 2>/dev/null | sed -n 's/^$ac_var=//p'\`"
182    done
183    # Open Windows xmkmf reportedly sets LIBDIR instead of USRLIBDIR.
184    for ac_extension in a so sl dylib la dll; do
185      if test ! -f "$ac_im_usrlibdir/libX11.$ac_extension" &&
186	 test -f "$ac_im_libdir/libX11.$ac_extension"; then
187	ac_im_usrlibdir=$ac_im_libdir; break
188      fi
189    done
190    # Screen out bogus values from the imake configuration.  They are
191    # bogus both because they are the default anyway, and because
192    # using them would break gcc on systems where it needs fixed includes.
193    case $ac_im_incroot in
194	/usr/include) ac_x_includes= ;;
195	*) test -f "$ac_im_incroot/X11/Xos.h" && ac_x_includes=$ac_im_incroot;;
196    esac
197    case $ac_im_usrlibdir in
198	/usr/lib | /usr/lib64 | /lib | /lib64) ;;
199	*) test -d "$ac_im_usrlibdir" && ac_x_libraries=$ac_im_usrlibdir ;;
200    esac
201  fi
202  cd ..
203  rm -f -r conftest.dir
204fi
205])# _AC_PATH_X_XMKMF
206
207
208# _AC_PATH_X_DIRECT
209# -----------------
210# Internal subroutine of _AC_PATH_X.
211# Set ac_x_includes and/or ac_x_libraries.
212m4_define([_AC_PATH_X_DIRECT],
213[# Standard set of common directories for X headers.
214# Check X11 before X11Rn because it is often a symlink to the current release.
215ac_x_header_dirs='
216/usr/X11/include
217/usr/X11R7/include
218/usr/X11R6/include
219/usr/X11R5/include
220/usr/X11R4/include
221
222/usr/include/X11
223/usr/include/X11R7
224/usr/include/X11R6
225/usr/include/X11R5
226/usr/include/X11R4
227
228/usr/local/X11/include
229/usr/local/X11R7/include
230/usr/local/X11R6/include
231/usr/local/X11R5/include
232/usr/local/X11R4/include
233
234/usr/local/include/X11
235/usr/local/include/X11R7
236/usr/local/include/X11R6
237/usr/local/include/X11R5
238/usr/local/include/X11R4
239
240/usr/X386/include
241/usr/x386/include
242/usr/XFree86/include/X11
243
244/usr/include
245/usr/local/include
246/usr/unsupported/include
247/usr/athena/include
248/usr/local/x11r5/include
249/usr/lpp/Xamples/include
250
251/usr/openwin/include
252/usr/openwin/share/include'
253
254if test "$ac_x_includes" = no; then
255  # Guess where to find include files, by looking for Xlib.h.
256  # First, try using that file with no special directory specified.
257  AC_PREPROC_IFELSE([AC_LANG_SOURCE([@%:@include <X11/Xlib.h>])],
258[# We can compile using X headers with no special include directory.
259ac_x_includes=],
260[for ac_dir in $ac_x_header_dirs; do
261  if test -r "$ac_dir/X11/Xlib.h"; then
262    ac_x_includes=$ac_dir
263    break
264  fi
265done])
266fi # $ac_x_includes = no
267
268if test "$ac_x_libraries" = no; then
269  # Check for the libraries.
270  # See if we find them without any special options.
271  # Don't add to $LIBS permanently.
272  ac_save_LIBS=$LIBS
273  LIBS="-lX11 $LIBS"
274  AC_LINK_IFELSE([AC_LANG_PROGRAM([@%:@include <X11/Xlib.h>],
275				  [XrmInitialize ()])],
276		 [LIBS=$ac_save_LIBS
277# We can link X programs with no special library path.
278ac_x_libraries=],
279		 [LIBS=$ac_save_LIBS
280for ac_dir in `AS_ECHO(["$ac_x_includes $ac_x_header_dirs"]) | sed s/include/lib/g`
281do
282  # Don't even attempt the hair of trying to link an X program!
283  for ac_extension in a so sl dylib la dll; do
284    if test -r "$ac_dir/libX11.$ac_extension"; then
285      ac_x_libraries=$ac_dir
286      break 2
287    fi
288  done
289done])
290fi # $ac_x_libraries = no
291])# _AC_PATH_X_DIRECT
292
293
294# _AC_PATH_X
295# ----------
296# Compute ac_cv_have_x.
297AC_DEFUN([_AC_PATH_X],
298[AC_CACHE_VAL(ac_cv_have_x,
299[# One or both of the vars are not set, and there is no cached value.
300ac_x_includes=no ac_x_libraries=no
301_AC_PATH_X_XMKMF
302_AC_PATH_X_DIRECT
303case $ac_x_includes,$ac_x_libraries in #(
304  no,* | *,no | *\'*)
305    # Didn't find X, or a directory has "'" in its name.
306    ac_cv_have_x="have_x=no";; #(
307  *)
308    # Record where we found X for the cache.
309    ac_cv_have_x="have_x=yes\
310	ac_x_includes='$ac_x_includes'\
311	ac_x_libraries='$ac_x_libraries'"
312esac])dnl
313])
314
315
316# AC_PATH_X
317# ---------
318# If we find X, set shell vars x_includes and x_libraries to the
319# paths, otherwise set no_x=yes.
320# Uses ac_ vars as temps to allow command line to override cache and checks.
321# --without-x overrides everything else, but does not touch the cache.
322AN_HEADER([X11/Xlib.h],  [AC_PATH_X])
323AC_DEFUN([AC_PATH_X],
324[dnl Document the X abnormal options inherited from history.
325m4_divert_once([HELP_BEGIN], [
326X features:
327  --x-includes=DIR    X include files are in DIR
328  --x-libraries=DIR   X library files are in DIR])dnl
329AC_MSG_CHECKING([for X])
330
331AC_ARG_WITH(x, [  --with-x                use the X Window System])
332# $have_x is `yes', `no', `disabled', or empty when we do not yet know.
333if test "x$with_x" = xno; then
334  # The user explicitly disabled X.
335  have_x=disabled
336else
337  case $x_includes,$x_libraries in #(
338    *\'*) AC_MSG_ERROR([cannot use X directory names containing ']);; #(
339    *,NONE | NONE,*) _AC_PATH_X;; #(
340    *) have_x=yes;;
341  esac
342  eval "$ac_cv_have_x"
343fi # $with_x != no
344
345if test "$have_x" != yes; then
346  AC_MSG_RESULT([$have_x])
347  no_x=yes
348else
349  # If each of the values was on the command line, it overrides each guess.
350  test "x$x_includes" = xNONE && x_includes=$ac_x_includes
351  test "x$x_libraries" = xNONE && x_libraries=$ac_x_libraries
352  # Update the cache value to reflect the command line values.
353  ac_cv_have_x="have_x=yes\
354	ac_x_includes='$x_includes'\
355	ac_x_libraries='$x_libraries'"
356  AC_MSG_RESULT([libraries $x_libraries, headers $x_includes])
357fi
358])# AC_PATH_X
359
360
361
362# AC_PATH_XTRA
363# ------------
364# Find additional X libraries, magic flags, etc.
365AC_DEFUN([AC_PATH_XTRA],
366[AC_REQUIRE([AC_PATH_X])dnl
367if test "$no_x" = yes; then
368  # Not all programs may use this symbol, but it does not hurt to define it.
369  AC_DEFINE([X_DISPLAY_MISSING], 1,
370	    [Define to 1 if the X Window System is missing or not being used.])
371  X_CFLAGS= X_PRE_LIBS= X_LIBS= X_EXTRA_LIBS=
372else
373  if test -n "$x_includes"; then
374    X_CFLAGS="$X_CFLAGS -I$x_includes"
375  fi
376
377  # It would also be nice to do this for all -L options, not just this one.
378  if test -n "$x_libraries"; then
379    X_LIBS="$X_LIBS -L$x_libraries"
380    # For Solaris; some versions of Sun CC require a space after -R and
381    # others require no space.  Words are not sufficient . . . .
382    AC_MSG_CHECKING([whether -R must be followed by a space])
383    ac_xsave_LIBS=$LIBS; LIBS="$LIBS -R$x_libraries"
384    ac_xsave_[]_AC_LANG_ABBREV[]_werror_flag=$ac_[]_AC_LANG_ABBREV[]_werror_flag
385    ac_[]_AC_LANG_ABBREV[]_werror_flag=yes
386    AC_LINK_IFELSE([AC_LANG_PROGRAM()],
387      [AC_MSG_RESULT([no])
388       X_LIBS="$X_LIBS -R$x_libraries"],
389      [LIBS="$ac_xsave_LIBS -R $x_libraries"
390       AC_LINK_IFELSE([AC_LANG_PROGRAM()],
391	 [AC_MSG_RESULT([yes])
392	  X_LIBS="$X_LIBS -R $x_libraries"],
393	 [AC_MSG_RESULT([neither works])])])
394    ac_[]_AC_LANG_ABBREV[]_werror_flag=$ac_xsave_[]_AC_LANG_ABBREV[]_werror_flag
395    LIBS=$ac_xsave_LIBS
396  fi
397
398  # Check for system-dependent libraries X programs must link with.
399  # Do this before checking for the system-independent R6 libraries
400  # (-lICE), since we may need -lsocket or whatever for X linking.
401
402  if test "$ISC" = yes; then
403    X_EXTRA_LIBS="$X_EXTRA_LIBS -lnsl_s -linet"
404  else
405    # Martyn Johnson says this is needed for Ultrix, if the X
406    # libraries were built with DECnet support.  And Karl Berry says
407    # the Alpha needs dnet_stub (dnet does not exist).
408    ac_xsave_LIBS="$LIBS"; LIBS="$LIBS $X_LIBS -lX11"
409    AC_LINK_IFELSE([AC_LANG_CALL([], [XOpenDisplay])],
410		   [],
411    [AC_CHECK_LIB(dnet, dnet_ntoa, [X_EXTRA_LIBS="$X_EXTRA_LIBS -ldnet"])
412    if test $ac_cv_lib_dnet_dnet_ntoa = no; then
413      AC_CHECK_LIB(dnet_stub, dnet_ntoa,
414	[X_EXTRA_LIBS="$X_EXTRA_LIBS -ldnet_stub"])
415    fi])
416    LIBS="$ac_xsave_LIBS"
417
418    # msh@cis.ufl.edu says -lnsl (and -lsocket) are needed for his 386/AT,
419    # to get the SysV transport functions.
420    # Chad R. Larson says the Pyramis MIS-ES running DC/OSx (SVR4)
421    # needs -lnsl.
422    # The nsl library prevents programs from opening the X display
423    # on Irix 5.2, according to T.E. Dickey.
424    # The functions gethostbyname, getservbyname, and inet_addr are
425    # in -lbsd on LynxOS 3.0.1/i386, according to Lars Hecking.
426    AC_CHECK_FUNC(gethostbyname)
427    if test $ac_cv_func_gethostbyname = no; then
428      AC_CHECK_LIB(nsl, gethostbyname, X_EXTRA_LIBS="$X_EXTRA_LIBS -lnsl")
429      if test $ac_cv_lib_nsl_gethostbyname = no; then
430	AC_CHECK_LIB(bsd, gethostbyname, X_EXTRA_LIBS="$X_EXTRA_LIBS -lbsd")
431      fi
432    fi
433
434    # lieder@skyler.mavd.honeywell.com says without -lsocket,
435    # socket/setsockopt and other routines are undefined under SCO ODT
436    # 2.0.  But -lsocket is broken on IRIX 5.2 (and is not necessary
437    # on later versions), says Simon Leinen: it contains gethostby*
438    # variants that don't use the name server (or something).  -lsocket
439    # must be given before -lnsl if both are needed.  We assume that
440    # if connect needs -lnsl, so does gethostbyname.
441    AC_CHECK_FUNC(connect)
442    if test $ac_cv_func_connect = no; then
443      AC_CHECK_LIB(socket, connect, X_EXTRA_LIBS="-lsocket $X_EXTRA_LIBS", ,
444	$X_EXTRA_LIBS)
445    fi
446
447    # Guillermo Gomez says -lposix is necessary on A/UX.
448    AC_CHECK_FUNC(remove)
449    if test $ac_cv_func_remove = no; then
450      AC_CHECK_LIB(posix, remove, X_EXTRA_LIBS="$X_EXTRA_LIBS -lposix")
451    fi
452
453    # BSDI BSD/OS 2.1 needs -lipc for XOpenDisplay.
454    AC_CHECK_FUNC(shmat)
455    if test $ac_cv_func_shmat = no; then
456      AC_CHECK_LIB(ipc, shmat, X_EXTRA_LIBS="$X_EXTRA_LIBS -lipc")
457    fi
458  fi
459
460  # Check for libraries that X11R6 Xt/Xaw programs need.
461  ac_save_LDFLAGS=$LDFLAGS
462  test -n "$x_libraries" && LDFLAGS="$LDFLAGS -L$x_libraries"
463  # SM needs ICE to (dynamically) link under SunOS 4.x (so we have to
464  # check for ICE first), but we must link in the order -lSM -lICE or
465  # we get undefined symbols.  So assume we have SM if we have ICE.
466  # These have to be linked with before -lX11, unlike the other
467  # libraries we check for below, so use a different variable.
468  # John Interrante, Karl Berry
469  AC_CHECK_LIB(ICE, IceConnectionNumber,
470    [X_PRE_LIBS="$X_PRE_LIBS -lSM -lICE"], , $X_EXTRA_LIBS)
471  LDFLAGS=$ac_save_LDFLAGS
472
473fi
474AC_SUBST(X_CFLAGS)dnl
475AC_SUBST(X_PRE_LIBS)dnl
476AC_SUBST(X_LIBS)dnl
477AC_SUBST(X_EXTRA_LIBS)dnl
478])# AC_PATH_XTRA
479