# This file is part of Autoconf. -*- Autoconf -*- # Checking for libraries. # Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, # 2002, 2003, 2004, 2005, 2006, 2008 Free Software Foundation, Inc. # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2, or (at your option) # any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA # 02110-1301, USA. # As a special exception, the Free Software Foundation gives unlimited # permission to copy, distribute and modify the configure scripts that # are the output of Autoconf. You need not follow the terms of the GNU # General Public License when using or distributing such scripts, even # though portions of the text of Autoconf appear in them. The GNU # General Public License (GPL) does govern all other use of the material # that constitutes the Autoconf program. # # Certain portions of the Autoconf source text are designed to be copied # (in certain cases, depending on the input) into the output of # Autoconf. We call these the "data" portions. The rest of the Autoconf # source text consists of comments plus executable code that decides which # of the data portions to output in any given case. We call these # comments and executable code the "non-data" portions. Autoconf never # copies any of the non-data portions into its output. # # This special exception to the GPL applies to versions of Autoconf # released by the Free Software Foundation. When you make and # distribute a modified version of Autoconf, you may extend this special # exception to the GPL to apply to your modified version as well, *unless* # your modified version has the potential to copy into its output some # of the text that was the non-data portion of the version that you started # with. (In other words, unless your change moves or copies text from # the non-data portions to the data portions.) If your modification has # such potential, you must delete any notice of this special exception # to the GPL from your modified version. # # Written by David MacKenzie, with help from # Franc,ois Pinard, Karl Berry, Richard Pixley, Ian Lance Taylor, # Roland McGrath, Noah Friedman, david d zuhn, and many others. # Table of contents # # 1. Generic tests for libraries # 2. Tests for specific libraries ## --------------------------------- ## ## 1. Generic tests for libraries.## ## ## --------------------------------- ## # AC_SEARCH_LIBS(FUNCTION, SEARCH-LIBS, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND], # [OTHER-LIBRARIES]) # -------------------------------------------------------- # Search for a library defining FUNC, if it's not already available. AC_DEFUN([AC_SEARCH_LIBS], [AS_VAR_PUSHDEF([ac_Search], [ac_cv_search_$1])dnl AC_CACHE_CHECK([for library containing $1], [ac_Search], [ac_func_search_save_LIBS=$LIBS AC_LANG_CONFTEST([AC_LANG_CALL([], [$1])]) for ac_lib in '' $2; do if test -z "$ac_lib"; then ac_res="none required" else ac_res=-l$ac_lib LIBS="-l$ac_lib $5 $ac_func_search_save_LIBS" fi AC_LINK_IFELSE([], [AS_VAR_SET([ac_Search], [$ac_res])]) AS_VAR_SET_IF([ac_Search], [break])dnl done AS_VAR_SET_IF([ac_Search], , [AS_VAR_SET([ac_Search], [no])])dnl rm conftest.$ac_ext LIBS=$ac_func_search_save_LIBS]) ac_res=AS_VAR_GET([ac_Search]) AS_IF([test "$ac_res" != no], [test "$ac_res" = "none required" || LIBS="$ac_res $LIBS" $3], [$4])dnl AS_VAR_POPDEF([ac_Search])dnl ]) # AC_CHECK_LIB(LIBRARY, FUNCTION, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND], # [OTHER-LIBRARIES]) # ------------------------------------------------------ # # Use a cache variable name containing both the library and function name, # because the test really is for library $1 defining function $2, not # just for library $1. Separate tests with the same $1 and different $2s # may have different results. # # Note that using directly AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1_$2]) # is asking for troubles, since AC_CHECK_LIB($lib, fun) would give # ac_cv_lib_$lib_fun, which is definitely not what was meant. Hence # the AS_LITERAL_IF indirection. # # FIXME: This macro is extremely suspicious. It DEFINEs unconditionally, # whatever the FUNCTION, in addition to not being a *S macro. Note # that the cache does depend upon the function we are looking for. # # It is on purpose we used `ac_check_lib_save_LIBS' and not just # `ac_save_LIBS': there are many macros which don't want to see `LIBS' # changed but still want to use AC_CHECK_LIB, so they save `LIBS'. # And ``ac_save_LIBS' is too tempting a name, so let's leave them some # freedom. AC_DEFUN([AC_CHECK_LIB], [m4_ifval([$3], , [AH_CHECK_LIB([$1])])dnl AS_LITERAL_IF([$1], [AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1_$2])], [AS_VAR_PUSHDEF([ac_Lib], [ac_cv_lib_$1''_$2])])dnl AC_CACHE_CHECK([for $2 in -l$1], [ac_Lib], [ac_check_lib_save_LIBS=$LIBS LIBS="-l$1 $5 $LIBS" AC_LINK_IFELSE([AC_LANG_CALL([], [$2])], [AS_VAR_SET([ac_Lib], [yes])], [AS_VAR_SET([ac_Lib], [no])]) LIBS=$ac_check_lib_save_LIBS]) AS_VAR_IF([ac_Lib], [yes], [m4_default([$3], [AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_LIB$1)) LIBS="-l$1 $LIBS" ])], [$4])dnl AS_VAR_POPDEF([ac_Lib])dnl ])# AC_CHECK_LIB # AH_CHECK_LIB(LIBNAME) # --------------------- m4_define([AH_CHECK_LIB], [AH_TEMPLATE(AS_TR_CPP([HAVE_LIB$1]), [Define to 1 if you have the `$1' library (-l$1).])]) # AC_HAVE_LIBRARY(LIBRARY, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND], # [OTHER-LIBRARIES]) # --------------------------------------------------------- # # This macro is equivalent to calling `AC_CHECK_LIB' with a FUNCTION # argument of `main'. In addition, LIBRARY can be written as any of # `foo', `-lfoo', or `libfoo.a'. In all of those cases, the compiler # is passed `-lfoo'. However, LIBRARY cannot be a shell variable; # it must be a literal name. AU_DEFUN([AC_HAVE_LIBRARY], [m4_pushdef([AC_Lib_Name], m4_bpatsubst(m4_bpatsubst([[$1]], [lib\([^\.]*\)\.a], [\1]), [-l], []))dnl AC_CHECK_LIB(AC_Lib_Name, main, [$2], [$3], [$4])dnl ac_cv_lib_[]AC_Lib_Name()=ac_cv_lib_[]AC_Lib_Name()_main m4_popdef([AC_Lib_Name])dnl ]) ## --------------------------------- ## ## 2. Tests for specific libraries. ## ## --------------------------------- ## # --------------------- # # Checks for X window. # # --------------------- # # _AC_PATH_X_XMKMF # ---------------- # Internal subroutine of _AC_PATH_X. # Set ac_x_includes and/or ac_x_libraries. m4_define([_AC_PATH_X_XMKMF], [AC_ARG_VAR(XMKMF, [Path to xmkmf, Makefile generator for X Window System])dnl rm -f -r conftest.dir if mkdir conftest.dir; then cd conftest.dir cat >Imakefile <<'_ACEOF' incroot: @echo incroot='${INCROOT}' usrlibdir: @echo usrlibdir='${USRLIBDIR}' libdir: @echo libdir='${LIBDIR}' _ACEOF if (export CC; ${XMKMF-xmkmf}) >/dev/null 2>/dev/null && test -f Makefile; then # GNU make sometimes prints "make[1]: Entering...", which would confuse us. for ac_var in incroot usrlibdir libdir; do eval "ac_im_$ac_var=\`\${MAKE-make} $ac_var 2>/dev/null | sed -n 's/^$ac_var=//p'\`" done # Open Windows xmkmf reportedly sets LIBDIR instead of USRLIBDIR. for ac_extension in a so sl dylib la dll; do if test ! -f "$ac_im_usrlibdir/libX11.$ac_extension" && test -f "$ac_im_libdir/libX11.$ac_extension"; then ac_im_usrlibdir=$ac_im_libdir; break fi done # Screen out bogus values from the imake configuration. They are # bogus both because they are the default anyway, and because # using them would break gcc on systems where it needs fixed includes. case $ac_im_incroot in /usr/include) ac_x_includes= ;; *) test -f "$ac_im_incroot/X11/Xos.h" && ac_x_includes=$ac_im_incroot;; esac case $ac_im_usrlibdir in /usr/lib | /usr/lib64 | /lib | /lib64) ;; *) test -d "$ac_im_usrlibdir" && ac_x_libraries=$ac_im_usrlibdir ;; esac fi cd .. rm -f -r conftest.dir fi ])# _AC_PATH_X_XMKMF # _AC_PATH_X_DIRECT # ----------------- # Internal subroutine of _AC_PATH_X. # Set ac_x_includes and/or ac_x_libraries. m4_define([_AC_PATH_X_DIRECT], [# Standard set of common directories for X headers. # Check X11 before X11Rn because it is often a symlink to the current release. ac_x_header_dirs=' /usr/X11/include /usr/X11R6/include /usr/X11R5/include /usr/X11R4/include /usr/include/X11 /usr/include/X11R6 /usr/include/X11R5 /usr/include/X11R4 /usr/local/X11/include /usr/local/X11R6/include /usr/local/X11R5/include /usr/local/X11R4/include /usr/local/include/X11 /usr/local/include/X11R6 /usr/local/include/X11R5 /usr/local/include/X11R4 /usr/X386/include /usr/x386/include /usr/XFree86/include/X11 /usr/include /usr/local/include /usr/unsupported/include /usr/athena/include /usr/local/x11r5/include /usr/lpp/Xamples/include /usr/openwin/include /usr/openwin/share/include' if test "$ac_x_includes" = no; then # Guess where to find include files, by looking for Xlib.h. # First, try using that file with no special directory specified. AC_PREPROC_IFELSE([AC_LANG_SOURCE([@%:@include ])], [# We can compile using X headers with no special include directory. ac_x_includes=], [for ac_dir in $ac_x_header_dirs; do if test -r "$ac_dir/X11/Xlib.h"; then ac_x_includes=$ac_dir break fi done]) fi # $ac_x_includes = no if test "$ac_x_libraries" = no; then # Check for the libraries. # See if we find them without any special options. # Don't add to $LIBS permanently. ac_save_LIBS=$LIBS LIBS="-lX11 $LIBS" AC_LINK_IFELSE([AC_LANG_PROGRAM([@%:@include ], [XrmInitialize ()])], [LIBS=$ac_save_LIBS # We can link X programs with no special library path. ac_x_libraries=], [LIBS=$ac_save_LIBS for ac_dir in `AS_ECHO(["$ac_x_includes $ac_x_header_dirs"]) | sed s/include/lib/g` do # Don't even attempt the hair of trying to link an X program! for ac_extension in a so sl dylib la dll; do if test -r "$ac_dir/libX11.$ac_extension"; then ac_x_libraries=$ac_dir break 2 fi done done]) fi # $ac_x_libraries = no ])# _AC_PATH_X_DIRECT # _AC_PATH_X # ---------- # Compute ac_cv_have_x. AC_DEFUN([_AC_PATH_X], [AC_CACHE_VAL(ac_cv_have_x, [# One or both of the vars are not set, and there is no cached value. ac_x_includes=no ac_x_libraries=no _AC_PATH_X_XMKMF _AC_PATH_X_DIRECT case $ac_x_includes,$ac_x_libraries in #( no,* | *,no | *\'*) # Didn't find X, or a directory has "'" in its name. ac_cv_have_x="have_x=no";; #( *) # Record where we found X for the cache. ac_cv_have_x="have_x=yes\ ac_x_includes='$ac_x_includes'\ ac_x_libraries='$ac_x_libraries'" esac])dnl ]) # AC_PATH_X # --------- # If we find X, set shell vars x_includes and x_libraries to the # paths, otherwise set no_x=yes. # Uses ac_ vars as temps to allow command line to override cache and checks. # --without-x overrides everything else, but does not touch the cache. AN_HEADER([X11/Xlib.h], [AC_PATH_X]) AC_DEFUN([AC_PATH_X], [dnl Document the X abnormal options inherited from history. m4_divert_once([HELP_BEGIN], [ X features: --x-includes=DIR X include files are in DIR --x-libraries=DIR X library files are in DIR])dnl AC_MSG_CHECKING([for X]) AC_ARG_WITH(x, [ --with-x use the X Window System]) # $have_x is `yes', `no', `disabled', or empty when we do not yet know. if test "x$with_x" = xno; then # The user explicitly disabled X. have_x=disabled else case $x_includes,$x_libraries in #( *\'*) AC_MSG_ERROR([cannot use X directory names containing ']);; #( *,NONE | NONE,*) _AC_PATH_X;; #( *) have_x=yes;; esac eval "$ac_cv_have_x" fi # $with_x != no if test "$have_x" != yes; then AC_MSG_RESULT([$have_x]) no_x=yes else # If each of the values was on the command line, it overrides each guess. test "x$x_includes" = xNONE && x_includes=$ac_x_includes test "x$x_libraries" = xNONE && x_libraries=$ac_x_libraries # Update the cache value to reflect the command line values. ac_cv_have_x="have_x=yes\ ac_x_includes='$x_includes'\ ac_x_libraries='$x_libraries'" AC_MSG_RESULT([libraries $x_libraries, headers $x_includes]) fi ])# AC_PATH_X # AC_PATH_XTRA # ------------ # Find additional X libraries, magic flags, etc. AC_DEFUN([AC_PATH_XTRA], [AC_REQUIRE([AC_PATH_X])dnl if test "$no_x" = yes; then # Not all programs may use this symbol, but it does not hurt to define it. AC_DEFINE([X_DISPLAY_MISSING], 1, [Define to 1 if the X Window System is missing or not being used.]) X_CFLAGS= X_PRE_LIBS= X_LIBS= X_EXTRA_LIBS= else if test -n "$x_includes"; then X_CFLAGS="$X_CFLAGS -I$x_includes" fi # It would also be nice to do this for all -L options, not just this one. if test -n "$x_libraries"; then X_LIBS="$X_LIBS -L$x_libraries" # For Solaris; some versions of Sun CC require a space after -R and # others require no space. Words are not sufficient . . . . AC_MSG_CHECKING([whether -R must be followed by a space]) ac_xsave_LIBS=$LIBS; LIBS="$LIBS -R$x_libraries" ac_xsave_[]_AC_LANG_ABBREV[]_werror_flag=$ac_[]_AC_LANG_ABBREV[]_werror_flag ac_[]_AC_LANG_ABBREV[]_werror_flag=yes AC_LINK_IFELSE([AC_LANG_PROGRAM()], [AC_MSG_RESULT([no]) X_LIBS="$X_LIBS -R$x_libraries"], [LIBS="$ac_xsave_LIBS -R $x_libraries" AC_LINK_IFELSE([AC_LANG_PROGRAM()], [AC_MSG_RESULT([yes]) X_LIBS="$X_LIBS -R $x_libraries"], [AC_MSG_RESULT([neither works])])]) ac_[]_AC_LANG_ABBREV[]_werror_flag=$ac_xsave_[]_AC_LANG_ABBREV[]_werror_flag LIBS=$ac_xsave_LIBS fi # Check for system-dependent libraries X programs must link with. # Do this before checking for the system-independent R6 libraries # (-lICE), since we may need -lsocket or whatever for X linking. if test "$ISC" = yes; then X_EXTRA_LIBS="$X_EXTRA_LIBS -lnsl_s -linet" else # Martyn Johnson says this is needed for Ultrix, if the X # libraries were built with DECnet support. And Karl Berry says # the Alpha needs dnet_stub (dnet does not exist). ac_xsave_LIBS="$LIBS"; LIBS="$LIBS $X_LIBS -lX11" AC_LINK_IFELSE([AC_LANG_CALL([], [XOpenDisplay])], [], [AC_CHECK_LIB(dnet, dnet_ntoa, [X_EXTRA_LIBS="$X_EXTRA_LIBS -ldnet"]) if test $ac_cv_lib_dnet_dnet_ntoa = no; then AC_CHECK_LIB(dnet_stub, dnet_ntoa, [X_EXTRA_LIBS="$X_EXTRA_LIBS -ldnet_stub"]) fi]) LIBS="$ac_xsave_LIBS" # msh@cis.ufl.edu says -lnsl (and -lsocket) are needed for his 386/AT, # to get the SysV transport functions. # Chad R. Larson says the Pyramis MIS-ES running DC/OSx (SVR4) # needs -lnsl. # The nsl library prevents programs from opening the X display # on Irix 5.2, according to T.E. Dickey. # The functions gethostbyname, getservbyname, and inet_addr are # in -lbsd on LynxOS 3.0.1/i386, according to Lars Hecking. AC_CHECK_FUNC(gethostbyname) if test $ac_cv_func_gethostbyname = no; then AC_CHECK_LIB(nsl, gethostbyname, X_EXTRA_LIBS="$X_EXTRA_LIBS -lnsl") if test $ac_cv_lib_nsl_gethostbyname = no; then AC_CHECK_LIB(bsd, gethostbyname, X_EXTRA_LIBS="$X_EXTRA_LIBS -lbsd") fi fi # lieder@skyler.mavd.honeywell.com says without -lsocket, # socket/setsockopt and other routines are undefined under SCO ODT # 2.0. But -lsocket is broken on IRIX 5.2 (and is not necessary # on later versions), says Simon Leinen: it contains gethostby* # variants that don't use the name server (or something). -lsocket # must be given before -lnsl if both are needed. We assume that # if connect needs -lnsl, so does gethostbyname. AC_CHECK_FUNC(connect) if test $ac_cv_func_connect = no; then AC_CHECK_LIB(socket, connect, X_EXTRA_LIBS="-lsocket $X_EXTRA_LIBS", , $X_EXTRA_LIBS) fi # Guillermo Gomez says -lposix is necessary on A/UX. AC_CHECK_FUNC(remove) if test $ac_cv_func_remove = no; then AC_CHECK_LIB(posix, remove, X_EXTRA_LIBS="$X_EXTRA_LIBS -lposix") fi # BSDI BSD/OS 2.1 needs -lipc for XOpenDisplay. AC_CHECK_FUNC(shmat) if test $ac_cv_func_shmat = no; then AC_CHECK_LIB(ipc, shmat, X_EXTRA_LIBS="$X_EXTRA_LIBS -lipc") fi fi # Check for libraries that X11R6 Xt/Xaw programs need. ac_save_LDFLAGS=$LDFLAGS test -n "$x_libraries" && LDFLAGS="$LDFLAGS -L$x_libraries" # SM needs ICE to (dynamically) link under SunOS 4.x (so we have to # check for ICE first), but we must link in the order -lSM -lICE or # we get undefined symbols. So assume we have SM if we have ICE. # These have to be linked with before -lX11, unlike the other # libraries we check for below, so use a different variable. # John Interrante, Karl Berry AC_CHECK_LIB(ICE, IceConnectionNumber, [X_PRE_LIBS="$X_PRE_LIBS -lSM -lICE"], , $X_EXTRA_LIBS) LDFLAGS=$ac_save_LDFLAGS fi AC_SUBST(X_CFLAGS)dnl AC_SUBST(X_PRE_LIBS)dnl AC_SUBST(X_LIBS)dnl AC_SUBST(X_EXTRA_LIBS)dnl ])# AC_PATH_XTRA