build/autoconf_prepend-include/autoconf/libs.m4

   1 # This file is part of Autoconf.                       -*- Autoconf -*-
   2 # Checking for libraries.
   3 # Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001,
   4 # 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
   5
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  20
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  44 # the non-data portions to the data portions.)  If your modification has
  45 # such potential, you must delete any notice of this special exception
  46 # to the GPL from your modified version.
  47 #
  48 # Written by David MacKenzie, with help from
  49 # Franc,ois Pinard, Karl Berry, Richard Pixley, Ian Lance Taylor,
  50 # Roland McGrath, Noah Friedman, david d zuhn, and many others.
  51
  52 # Table of contents
  53 #
  54 # 1. Generic tests for libraries
  55 # 2. Tests for specific libraries
  56
  57
  58 ## --------------------------------- ##
  59 ## 1. Generic tests for libraries.## ##
  60 ## --------------------------------- ##
  61
  62
  63
  64 # AC_SEARCH_LIBS(FUNCTION, SEARCH-LIBS,
  65 #                [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
  66 #                [OTHER-LIBRARIES])
  67 # --------------------------------------------------------
  68 # Search for a library defining FUNC, if it's not already available.
  69 AC_DEFUN([AC_SEARCH_LIBS],
  70 [AS_VAR_PUSHDEF([ac_Search], [ac_cv_search_$1])dnl
  71 AC_CACHE_CHECK([for library containing $1], [ac_Search],
  72 [ac_func_search_save_LIBS=$LIBS
  73 AC_LANG_CONFTEST([AC_LANG_CALL([], [$1])])
  74 for ac_lib in '' $2; do
  75   if test -z "$ac_lib"; then
  76     ac_res="none required"
  77   else
  78     ac_res=-l$ac_lib
  79     LIBS="-l$ac_lib $5 $ac_func_search_save_LIBS"
  80   fi
  81   AC_LINK_IFELSE([], [AS_VAR_SET([ac_Search], [$ac_res])])
  82   AS_VAR_SET_IF([ac_Search], [break])dnl
  83 done
  84 AS_VAR_SET_IF([ac_Search], , [AS_VAR_SET([ac_Search], [no])])dnl
  85 rm conftest.$ac_ext
  86 LIBS=$ac_func_search_save_LIBS])
  87 ac_res=AS_VAR_GET([ac_Search])
  88 AS_IF([test "$ac_res" != no],
  89   [test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
  90   $3],
  91       [$4])dnl
  92 AS_VAR_POPDEF([ac_Search])dnl
  93 ])
  94
  95
  96
  97 # AC_CHECK_LIB(LIBRARY, FUNCTION,
  98 #              [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
  99 #              [OTHER-LIBRARIES])
 100 # ------------------------------------------------------
 101 #
 102 # Use a cache variable name containing both the library and function name,
 103 # because the test really is for library $1 defining function $2, not
 104 # just for library $1.  Separate tests with the same $1 and different $2s
 105 # may have different results.
 106 #
 107 # Note that using directly AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1_$2])
 108 # is asking for troubles, since AC_CHECK_LIB($lib, fun) would give
 109 # ac_cv_lib_$lib_fun, which is definitely not what was meant.  Hence
 110 # the AS_LITERAL_IF indirection.
 111 #
 112 # FIXME: This macro is extremely suspicious.  It DEFINEs unconditionally,
 113 # whatever the FUNCTION, in addition to not being a *S macro.  Note
 114 # that the cache does depend upon the function we are looking for.
 115 #
 116 # It is on purpose we used `ac_check_lib_save_LIBS' and not just
 117 # `ac_save_LIBS': there are many macros which don't want to see `LIBS'
 118 # changed but still want to use AC_CHECK_LIB, so they save `LIBS'.
 119 # And ``ac_save_LIBS' is too tempting a name, so let's leave them some
 120 # freedom.
 121 AC_DEFUN([AC_CHECK_LIB],
 122 [m4_ifval([$3], , [AH_CHECK_LIB([$1])])dnl
 123 AS_LITERAL_IF([$1],
 124               [AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1_$2])],
 125               [AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1''_$2])])dnl
 126 AC_CACHE_CHECK([for $2 in -l$1], [ac_Lib],
 127 [ac_check_lib_save_LIBS=$LIBS
 128 LIBS="-l$1 $5 $LIBS"
 129 AC_LINK_IFELSE([AC_LANG_CALL([], [$2])],
 130                [AS_VAR_SET([ac_Lib], [yes])],
 131                [AS_VAR_SET([ac_Lib], [no])])
 132 LIBS=$ac_check_lib_save_LIBS])
 133 AS_IF([test AS_VAR_GET([ac_Lib]) = yes],
 134       [m4_default([$3], [AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_LIB$1))
 135   LIBS="-l$1 $LIBS"
 136 ])],
 137       [$4])dnl
 138 AS_VAR_POPDEF([ac_Lib])dnl
 139 ])# AC_CHECK_LIB
 140
 141
 142 # AH_CHECK_LIB(LIBNAME)
 143 # ---------------------
 144 m4_define([AH_CHECK_LIB],
 145 [AH_TEMPLATE(AS_TR_CPP([HAVE_LIB$1]),
 146              [Define to 1 if you have the `$1' library (-l$1).])])
 147
 148
 149 # AC_HAVE_LIBRARY(LIBRARY,
 150 #                 [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
 151 #                 [OTHER-LIBRARIES])
 152 # ---------------------------------------------------------
 153 #
 154 # This macro is equivalent to calling `AC_CHECK_LIB' with a FUNCTION
 155 # argument of `main'.  In addition, LIBRARY can be written as any of
 156 # `foo', `-lfoo', or `libfoo.a'.  In all of those cases, the compiler
 157 # is passed `-lfoo'.  However, LIBRARY cannot be a shell variable;
 158 # it must be a literal name.
 159 AU_DEFUN([AC_HAVE_LIBRARY],
 160 [m4_pushdef([AC_Lib_Name],
 161             m4_bpatsubst(m4_bpatsubst([[$1]],
 162                                     [lib\([^\.]*\)\.a], [\1]),
 163                         [-l], []))dnl
 164 AC_CHECK_LIB(AC_Lib_Name, main, [$2], [$3], [$4])dnl
 165 ac_cv_lib_[]AC_Lib_Name()=ac_cv_lib_[]AC_Lib_Name()_main
 166 m4_popdef([AC_Lib_Name])dnl
 167 ])
 168
 169
 170
 171
 172 ## --------------------------------- ##
 173 ## 2. Tests for specific libraries.  ##
 174 ## --------------------------------- ##
 175
 176
 177
 178 # --------------------- #
 179 # Checks for X window.  #
 180 # --------------------- #
 181
 182
 183 # _AC_PATH_X_XMKMF
 184 # ----------------
 185 # Internal subroutine of _AC_PATH_X.
 186 # Set ac_x_includes and/or ac_x_libraries.
 187 m4_define([_AC_PATH_X_XMKMF],
 188 [AC_ARG_VAR(XMKMF, [Path to xmkmf, Makefile generator for X Window System])dnl
 189 rm -f -r conftest.dir
 190 if mkdir conftest.dir; then
 191   cd conftest.dir
 192   cat >Imakefile <<'_ACEOF'
 193 incroot:
 194         @echo incroot='${INCROOT}'
 195 usrlibdir:
 196         @echo usrlibdir='${USRLIBDIR}'
 197 libdir:
 198         @echo libdir='${LIBDIR}'
 199 _ACEOF
 200   if (export CC; ${XMKMF-xmkmf}) >/dev/null 2>/dev/null && test -f Makefile; then
 201     # GNU make sometimes prints "make[1]: Entering...", which would confuse us.
 202     for ac_var in incroot usrlibdir libdir; do
 203       eval "ac_im_$ac_var=\`\${MAKE-make} $ac_var 2>/dev/null | sed -n 's/^$ac_var=//p'\`"
 204     done
 205     # Open Windows xmkmf reportedly sets LIBDIR instead of USRLIBDIR.
 206     for ac_extension in a so sl; do
 207       if test ! -f "$ac_im_usrlibdir/libX11.$ac_extension" &&
 208          test -f "$ac_im_libdir/libX11.$ac_extension"; then
 209         ac_im_usrlibdir=$ac_im_libdir; break
 210       fi
 211     done
 212     # Screen out bogus values from the imake configuration.  They are
 213     # bogus both because they are the default anyway, and because
 214     # using them would break gcc on systems where it needs fixed includes.
 215     case $ac_im_incroot in
 216         /usr/include) ac_x_includes= ;;
 217         *) test -f "$ac_im_incroot/X11/Xos.h" && ac_x_includes=$ac_im_incroot;;
 218     esac
 219     case $ac_im_usrlibdir in
 220         /usr/lib | /lib) ;;
 221         *) test -d "$ac_im_usrlibdir" && ac_x_libraries=$ac_im_usrlibdir ;;
 222     esac
 223   fi
 224   cd ..
 225   rm -f -r conftest.dir
 226 fi
 227 ])# _AC_PATH_X_XMKMF
 228
 229
 230 # _AC_PATH_X_DIRECT
 231 # -----------------
 232 # Internal subroutine of _AC_PATH_X.
 233 # Set ac_x_includes and/or ac_x_libraries.
 234 m4_define([_AC_PATH_X_DIRECT],
 235 [# Standard set of common directories for X headers.
 236 # Check X11 before X11Rn because it is often a symlink to the current release.
 237 ac_x_header_dirs='
 238 /usr/X11/include
 239 /usr/X11R6/include
 240 /usr/X11R5/include
 241 /usr/X11R4/include
 242
 243 /usr/include/X11
 244 /usr/include/X11R6
 245 /usr/include/X11R5
 246 /usr/include/X11R4
 247
 248 /usr/local/X11/include
 249 /usr/local/X11R6/include
 250 /usr/local/X11R5/include
 251 /usr/local/X11R4/include
 252
 253 /usr/local/include/X11
 254 /usr/local/include/X11R6
 255 /usr/local/include/X11R5
 256 /usr/local/include/X11R4
 257
 258 /usr/X386/include
 259 /usr/x386/include
 260 /usr/XFree86/include/X11
 261
 262 /usr/include
 263 /usr/local/include
 264 /usr/unsupported/include
 265 /usr/athena/include
 266 /usr/local/x11r5/include
 267 /usr/lpp/Xamples/include
 268
 269 /usr/openwin/include
 270 /usr/openwin/share/include'
 271
 272 if test "$ac_x_includes" = no; then
 273   # Guess where to find include files, by looking for Xlib.h.
 274   # First, try using that file with no special directory specified.
 275   AC_PREPROC_IFELSE([AC_LANG_SOURCE([@%:@include <X11/Xlib.h>])],
 276 [# We can compile using X headers with no special include directory.
 277 ac_x_includes=],
 278 [for ac_dir in $ac_x_header_dirs; do
 279   if test -r "$ac_dir/X11/Xlib.h"; then
 280     ac_x_includes=$ac_dir
 281     break
 282   fi
 283 done])
 284 fi # $ac_x_includes = no
 285
 286 if test "$ac_x_libraries" = no; then
 287   # Check for the libraries.
 288   # See if we find them without any special options.
 289   # Don't add to $LIBS permanently.
 290   ac_save_LIBS=$LIBS
 291   LIBS="-lX11 $LIBS"
 292   AC_LINK_IFELSE([AC_LANG_PROGRAM([@%:@include <X11/Xlib.h>],
 293                                   [XrmInitialize ()])],
 294                  [LIBS=$ac_save_LIBS
 295 # We can link X programs with no special library path.
 296 ac_x_libraries=],
 297                  [LIBS=$ac_save_LIBS
 298 for ac_dir in `echo "$ac_x_includes $ac_x_header_dirs" | sed s/include/lib/g`
 299 do
 300   # Don't even attempt the hair of trying to link an X program!
 301   for ac_extension in a so sl; do
 302     if test -r "$ac_dir/libX11.$ac_extension"; then
 303       ac_x_libraries=$ac_dir
 304       break 2
 305     fi
 306   done
 307 done])
 308 fi # $ac_x_libraries = no
 309 ])# _AC_PATH_X_DIRECT
 310
 311
 312 # _AC_PATH_X
 313 # ----------
 314 # Compute ac_cv_have_x.
 315 AC_DEFUN([_AC_PATH_X],
 316 [AC_CACHE_VAL(ac_cv_have_x,
 317 [# One or both of the vars are not set, and there is no cached value.
 318 ac_x_includes=no ac_x_libraries=no
 319 _AC_PATH_X_XMKMF
 320 _AC_PATH_X_DIRECT
 321 case $ac_x_includes,$ac_x_libraries in #(
 322   no,* | *,no | *\'*)
 323     # Didn't find X, or a directory has "'" in its name.
 324     ac_cv_have_x="have_x=no";; #(
 325   *)
 326     # Record where we found X for the cache.
 327     ac_cv_have_x="have_x=yes\
 328         ac_x_includes='$ac_x_includes'\
 329         ac_x_libraries='$ac_x_libraries'"
 330 esac])dnl
 331 ])
 332
 333
 334 # AC_PATH_X
 335 # ---------
 336 # If we find X, set shell vars x_includes and x_libraries to the
 337 # paths, otherwise set no_x=yes.
 338 # Uses ac_ vars as temps to allow command line to override cache and checks.
 339 # --without-x overrides everything else, but does not touch the cache.
 340 AN_HEADER([X11/Xlib.h],  [AC_PATH_X])
 341 AC_DEFUN([AC_PATH_X],
 342 [dnl Document the X abnormal options inherited from history.
 343 m4_divert_once([HELP_BEGIN], [
 344 X features:
 345   --x-includes=DIR    X include files are in DIR
 346   --x-libraries=DIR   X library files are in DIR])dnl
 347 AC_MSG_CHECKING([for X])
 348
 349 AC_ARG_WITH(x, [  --with-x                use the X Window System])
 350 # $have_x is `yes', `no', `disabled', or empty when we do not yet know.
 351 if test "x$with_x" = xno; then
 352   # The user explicitly disabled X.
 353   have_x=disabled
 354 else
 355   case $x_includes,$x_libraries in #(
 356     *\'*) AC_MSG_ERROR([Cannot use X directory names containing ']);; #(
 357     *,NONE | NONE,*) _AC_PATH_X;; #(
 358     *) have_x=yes;;
 359   esac
 360   eval "$ac_cv_have_x"
 361 fi # $with_x != no
 362
 363 if test "$have_x" != yes; then
 364   AC_MSG_RESULT([$have_x])
 365   no_x=yes
 366 else
 367   # If each of the values was on the command line, it overrides each guess.
 368   test "x$x_includes" = xNONE && x_includes=$ac_x_includes
 369   test "x$x_libraries" = xNONE && x_libraries=$ac_x_libraries
 370   # Update the cache value to reflect the command line values.
 371   ac_cv_have_x="have_x=yes\
 372         ac_x_includes='$x_includes'\
 373         ac_x_libraries='$x_libraries'"
 374   AC_MSG_RESULT([libraries $x_libraries, headers $x_includes])
 375 fi
 376 ])# AC_PATH_X
 377
 378
 379
 380 # AC_PATH_XTRA
 381 # ------------
 382 # Find additional X libraries, magic flags, etc.
 383 AC_DEFUN([AC_PATH_XTRA],
 384 [AC_REQUIRE([AC_PATH_X])dnl
 385 if test "$no_x" = yes; then
 386   # Not all programs may use this symbol, but it does not hurt to define it.
 387   AC_DEFINE([X_DISPLAY_MISSING], 1,
 388             [Define to 1 if the X Window System is missing or not being used.])
 389   X_CFLAGS= X_PRE_LIBS= X_LIBS= X_EXTRA_LIBS=
 390 else
 391   if test -n "$x_includes"; then
 392     X_CFLAGS="$X_CFLAGS -I$x_includes"
 393   fi
 394
 395   # It would also be nice to do this for all -L options, not just this one.
 396   if test -n "$x_libraries"; then
 397     X_LIBS="$X_LIBS -L$x_libraries"
 398     # For Solaris; some versions of Sun CC require a space after -R and
 399     # others require no space.  Words are not sufficient . . . .
 400     AC_MSG_CHECKING([whether -R must be followed by a space])
 401     ac_xsave_LIBS=$LIBS; LIBS="$LIBS -R$x_libraries"
 402     ac_xsave_[]_AC_LANG_ABBREV[]_werror_flag=$ac_[]_AC_LANG_ABBREV[]_werror_flag
 403     ac_[]_AC_LANG_ABBREV[]_werror_flag=yes
 404     AC_LINK_IFELSE([AC_LANG_PROGRAM()],
 405       [AC_MSG_RESULT([no])
 406        X_LIBS="$X_LIBS -R$x_libraries"],
 407       [LIBS="$ac_xsave_LIBS -R $x_libraries"
 408        AC_LINK_IFELSE([AC_LANG_PROGRAM()],
 409          [AC_MSG_RESULT([yes])
 410           X_LIBS="$X_LIBS -R $x_libraries"],
 411          [AC_MSG_RESULT([neither works])])])
 412     ac_[]_AC_LANG_ABBREV[]_werror_flag=$ac_xsave_[]_AC_LANG_ABBREV[]_werror_flag
 413     LIBS=$ac_xsave_LIBS
 414   fi
 415
 416   # Check for system-dependent libraries X programs must link with.
 417   # Do this before checking for the system-independent R6 libraries
 418   # (-lICE), since we may need -lsocket or whatever for X linking.
 419
 420   if test "$ISC" = yes; then
 421     X_EXTRA_LIBS="$X_EXTRA_LIBS -lnsl_s -linet"
 422   else
 423     # Martyn Johnson says this is needed for Ultrix, if the X
 424     # libraries were built with DECnet support.  And Karl Berry says
 425     # the Alpha needs dnet_stub (dnet does not exist).
 426     ac_xsave_LIBS="$LIBS"; LIBS="$LIBS $X_LIBS -lX11"
 427     AC_LINK_IFELSE([AC_LANG_CALL([], [XOpenDisplay])],
 428                    [],
 429     [AC_CHECK_LIB(dnet, dnet_ntoa, [X_EXTRA_LIBS="$X_EXTRA_LIBS -ldnet"])
 430     if test $ac_cv_lib_dnet_dnet_ntoa = no; then
 431       AC_CHECK_LIB(dnet_stub, dnet_ntoa,
 432         [X_EXTRA_LIBS="$X_EXTRA_LIBS -ldnet_stub"])
 433     fi])
 434     LIBS="$ac_xsave_LIBS"
 435
 436     # msh@cis.ufl.edu says -lnsl (and -lsocket) are needed for his 386/AT,
 437     # to get the SysV transport functions.
 438     # Chad R. Larson says the Pyramis MIS-ES running DC/OSx (SVR4)
 439     # needs -lnsl.
 440     # The nsl library prevents programs from opening the X display
 441     # on Irix 5.2, according to T.E. Dickey.
 442     # The functions gethostbyname, getservbyname, and inet_addr are
 443     # in -lbsd on LynxOS 3.0.1/i386, according to Lars Hecking.
 444     AC_CHECK_FUNC(gethostbyname)
 445     if test $ac_cv_func_gethostbyname = no; then
 446       AC_CHECK_LIB(nsl, gethostbyname, X_EXTRA_LIBS="$X_EXTRA_LIBS -lnsl")
 447       if test $ac_cv_lib_nsl_gethostbyname = no; then
 448         AC_CHECK_LIB(bsd, gethostbyname, X_EXTRA_LIBS="$X_EXTRA_LIBS -lbsd")
 449       fi
 450     fi
 451
 452     # lieder@skyler.mavd.honeywell.com says without -lsocket,
 453     # socket/setsockopt and other routines are undefined under SCO ODT
 454     # 2.0.  But -lsocket is broken on IRIX 5.2 (and is not necessary
 455     # on later versions), says Simon Leinen: it contains gethostby*
 456     # variants that don't use the name server (or something).  -lsocket
 457     # must be given before -lnsl if both are needed.  We assume that
 458     # if connect needs -lnsl, so does gethostbyname.
 459     AC_CHECK_FUNC(connect)
 460     if test $ac_cv_func_connect = no; then
 461       AC_CHECK_LIB(socket, connect, X_EXTRA_LIBS="-lsocket $X_EXTRA_LIBS", ,
 462         $X_EXTRA_LIBS)
 463     fi
 464
 465     # Guillermo Gomez says -lposix is necessary on A/UX.
 466     AC_CHECK_FUNC(remove)
 467     if test $ac_cv_func_remove = no; then
 468       AC_CHECK_LIB(posix, remove, X_EXTRA_LIBS="$X_EXTRA_LIBS -lposix")
 469     fi
 470
 471     # BSDI BSD/OS 2.1 needs -lipc for XOpenDisplay.
 472     AC_CHECK_FUNC(shmat)
 473     if test $ac_cv_func_shmat = no; then
 474       AC_CHECK_LIB(ipc, shmat, X_EXTRA_LIBS="$X_EXTRA_LIBS -lipc")
 475     fi
 476   fi
 477
 478   # Check for libraries that X11R6 Xt/Xaw programs need.
 479   ac_save_LDFLAGS=$LDFLAGS
 480   test -n "$x_libraries" && LDFLAGS="$LDFLAGS -L$x_libraries"
 481   # SM needs ICE to (dynamically) link under SunOS 4.x (so we have to
 482   # check for ICE first), but we must link in the order -lSM -lICE or
 483   # we get undefined symbols.  So assume we have SM if we have ICE.
 484   # These have to be linked with before -lX11, unlike the other
 485   # libraries we check for below, so use a different variable.
 486   # John Interrante, Karl Berry
 487   AC_CHECK_LIB(ICE, IceConnectionNumber,
 488     [X_PRE_LIBS="$X_PRE_LIBS -lSM -lICE"], , $X_EXTRA_LIBS)
 489   LDFLAGS=$ac_save_LDFLAGS
 490
 491 fi
 492 AC_SUBST(X_CFLAGS)dnl
 493 AC_SUBST(X_PRE_LIBS)dnl
 494 AC_SUBST(X_LIBS)dnl
 495 AC_SUBST(X_EXTRA_LIBS)dnl
 496 ])# AC_PATH_XTRA