+dnl Find a library (specifically the linkage used in the code fragment),
+dnl searching for it if it is not already in the library path.
+dnl See also CF_ADD_SEARCHPATH.
+dnl
+dnl Parameters (4-on are optional):
+dnl $1 = headers for library entrypoint
+dnl $2 = code fragment for library entrypoint
+dnl $3 = the library name without the "-l" option or ".so" suffix.
+dnl $4 = action to perform if successful (default: update CPPFLAGS, etc)
+dnl $5 = action to perform if not successful
+dnl $6 = module name, if not the same as the library name
+dnl $7 = extra libraries
+dnl
+dnl Sets these variables:
+dnl $cf_cv_find_linkage_$3 - yes/no according to whether linkage is found
+dnl $cf_cv_header_path_$3 - include-directory if needed
+dnl $cf_cv_library_path_$3 - library-directory if needed
+dnl $cf_cv_library_file_$3 - library-file if needed, e.g., -l$3
+AC_DEFUN([CF_FIND_LINKAGE],[
+
+# If the linkage is not already in the $CPPFLAGS/$LDFLAGS configuration, these
+# will be set on completion of the AC_TRY_LINK below.
+cf_cv_header_path_$3=
+cf_cv_library_path_$3=
+
+CF_MSG_LOG([Starting [FIND_LINKAGE]($3,$6)])
+
+cf_save_LIBS="$LIBS"
+
+AC_TRY_LINK([$1],[$2],[
+ cf_cv_find_linkage_$3=yes
+ cf_cv_header_path_$3=/usr/include
+ cf_cv_library_path_$3=/usr/lib
+],[
+
+LIBS="-l$3 $7 $cf_save_LIBS"
+
+AC_TRY_LINK([$1],[$2],[
+ cf_cv_find_linkage_$3=yes
+ cf_cv_header_path_$3=/usr/include
+ cf_cv_library_path_$3=/usr/lib
+ cf_cv_library_file_$3="-l$3"
+],[
+ cf_cv_find_linkage_$3=no
+ LIBS="$cf_save_LIBS"
+
+ CF_VERBOSE(find linkage for $3 library)
+ CF_MSG_LOG([Searching for headers in [FIND_LINKAGE]($3,$6)])
+
+ cf_save_CPPFLAGS="$CPPFLAGS"
+ cf_test_CPPFLAGS="$CPPFLAGS"
+
+ CF_HEADER_PATH(cf_search,ifelse([$6],,[$3],[$6]))
+ for cf_cv_header_path_$3 in $cf_search
+ do
+ if test -d $cf_cv_header_path_$3 ; then
+ CF_VERBOSE(... testing $cf_cv_header_path_$3)
+ CPPFLAGS="$cf_save_CPPFLAGS -I$cf_cv_header_path_$3"
+ AC_TRY_COMPILE([$1],[$2],[
+ CF_VERBOSE(... found $3 headers in $cf_cv_header_path_$3)
+ cf_cv_find_linkage_$3=maybe
+ cf_test_CPPFLAGS="$CPPFLAGS"
+ break],[
+ CPPFLAGS="$cf_save_CPPFLAGS"
+ ])
+ fi
+ done
+
+ if test "$cf_cv_find_linkage_$3" = maybe ; then
+
+ CF_MSG_LOG([Searching for $3 library in [FIND_LINKAGE]($3,$6)])
+
+ cf_save_LIBS="$LIBS"
+ cf_save_LDFLAGS="$LDFLAGS"
+
+ ifelse([$6],,,[
+ CPPFLAGS="$cf_test_CPPFLAGS"
+ LIBS="-l$3 $7 $cf_save_LIBS"
+ AC_TRY_LINK([$1],[$2],[
+ CF_VERBOSE(... found $3 library in system)
+ cf_cv_find_linkage_$3=yes])
+ CPPFLAGS="$cf_save_CPPFLAGS"
+ LIBS="$cf_save_LIBS"
+ ])
+
+ if test "$cf_cv_find_linkage_$3" != yes ; then
+ CF_LIBRARY_PATH(cf_search,$3)
+ for cf_cv_library_path_$3 in $cf_search
+ do
+ if test -d $cf_cv_library_path_$3 ; then
+ CF_VERBOSE(... testing $cf_cv_library_path_$3)
+ CPPFLAGS="$cf_test_CPPFLAGS"
+ LIBS="-l$3 $7 $cf_save_LIBS"
+ LDFLAGS="$cf_save_LDFLAGS -L$cf_cv_library_path_$3"
+ AC_TRY_LINK([$1],[$2],[
+ CF_VERBOSE(... found $3 library in $cf_cv_library_path_$3)
+ cf_cv_find_linkage_$3=yes
+ cf_cv_library_file_$3="-l$3"
+ break],[
+ CPPFLAGS="$cf_save_CPPFLAGS"
+ LIBS="$cf_save_LIBS"
+ LDFLAGS="$cf_save_LDFLAGS"
+ ])
+ fi
+ done
+ CPPFLAGS="$cf_save_CPPFLAGS"
+ LDFLAGS="$cf_save_LDFLAGS"
+ fi
+
+ else
+ cf_cv_find_linkage_$3=no
+ fi
+ ],$7)
+])
+
+LIBS="$cf_save_LIBS"
+
+if test "$cf_cv_find_linkage_$3" = yes ; then
+ifelse([$4],,[
+ CF_ADD_INCDIR($cf_cv_header_path_$3)
+ CF_ADD_LIBDIR($cf_cv_library_path_$3)
+ CF_ADD_LIB($3)
+],[$4])
+else
+ifelse([$5],,AC_MSG_WARN(Cannot find $3 library),[$5])
+fi
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_FUNC_DLSYM version: 2 updated: 2010/05/29 16:31:02
+dnl -------------
+dnl Test for dlsym() and related functions, as well as libdl.
+dnl
+dnl Sets
+dnl $cf_have_dlsym
+dnl $cf_have_libdl
+AC_DEFUN([CF_FUNC_DLSYM],[
+cf_have_dlsym=no
+AC_CHECK_FUNC(dlsym,cf_have_dlsym=yes,[
+
+cf_have_libdl=no
+AC_CHECK_LIB(dl,dlsym,[
+ cf_have_dlsym=yes
+ cf_have_libdl=yes])])
+
+if test "$cf_have_dlsym" = yes ; then
+ test "$cf_have_libdl" = yes && CF_ADD_LIB(dl)
+
+ AC_MSG_CHECKING(whether able to link to dl*() functions)
+ AC_TRY_LINK([#include <dlfcn.h>],[
+ void *obj;
+ if ((obj = dlopen("filename", 0)) != 0) {
+ if (dlsym(obj, "symbolname") == 0) {
+ dlclose(obj);
+ }
+ }],[
+ AC_DEFINE(HAVE_LIBDL)],[
+ AC_MSG_ERROR(Cannot link test program for libdl)])
+ AC_MSG_RESULT(ok)
+else
+ AC_MSG_ERROR(Cannot find dlsym function)
+fi
+])
+dnl ---------------------------------------------------------------------------
+dnl CF_FUNC_MEMMOVE version: 7 updated: 2006/12/16 12:33:30
+dnl ---------------
+dnl Check for memmove, or a bcopy that can handle overlapping copy. If neither
+dnl is found, add our own version of memmove to the list of objects.
+AC_DEFUN([CF_FUNC_MEMMOVE],
+[
+AC_CHECK_FUNC(memmove,,[
+AC_CHECK_FUNC(bcopy,[
+ AC_CACHE_CHECK(if bcopy does overlapping moves,cf_cv_good_bcopy,[
+ AC_TRY_RUN([
+int main() {
+ static char data[] = "abcdefghijklmnopqrstuwwxyz";
+ char temp[40];
+ bcopy(data, temp, sizeof(data));
+ bcopy(temp+10, temp, 15);
+ bcopy(temp+5, temp+15, 10);
+ ${cf_cv_main_return:-return} (strcmp(temp, "klmnopqrstuwwxypqrstuwwxyz"));
+}
+ ],
+ [cf_cv_good_bcopy=yes],
+ [cf_cv_good_bcopy=no],
+ [cf_cv_good_bcopy=unknown])
+ ])
+ ],[cf_cv_good_bcopy=no])
+ if test "$cf_cv_good_bcopy" = yes ; then
+ AC_DEFINE(USE_OK_BCOPY)
+ else
+ AC_DEFINE(USE_MY_MEMMOVE)
+ fi
+])])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_FUNC_NANOSLEEP version: 3 updated: 2006/12/16 12:33:30
+dnl -----------------
+dnl Check for existence of workable nanosleep() function. Some systems, e.g.,
+dnl AIX 4.x, provide a non-working version.
+AC_DEFUN([CF_FUNC_NANOSLEEP],[
+AC_CACHE_CHECK(if nanosleep really works,cf_cv_func_nanosleep,[
+AC_TRY_RUN([
+#include <stdio.h>
+#include <errno.h>
+#include <time.h>
+
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+
+int main() {
+ struct timespec ts1, ts2;
+ int code;
+ ts1.tv_sec = 0;
+ ts1.tv_nsec = 750000000;
+ ts2.tv_sec = 0;
+ ts2.tv_nsec = 0;
+ errno = 0;
+ code = nanosleep(&ts1, &ts2); /* on failure errno is ENOSYS. */
+ ${cf_cv_main_return:-return}(code != 0);
+}
+],
+ [cf_cv_func_nanosleep=yes],
+ [cf_cv_func_nanosleep=no],
+ [cf_cv_func_nanosleep=unknown])])
+
+test "$cf_cv_func_nanosleep" = "yes" && AC_DEFINE(HAVE_NANOSLEEP)
+])
+dnl ---------------------------------------------------------------------------
+dnl CF_FUNC_OPENPTY version: 3 updated: 2010/05/29 16:31:02
+dnl ---------------
+dnl Check for openpty() function, along with <pty.h> header. It may need the
+dnl "util" library as well.
+AC_DEFUN([CF_FUNC_OPENPTY],
+[
+AC_CHECK_LIB(util,openpty,cf_cv_lib_util=yes,cf_cv_lib_util=no)
+AC_CACHE_CHECK(for openpty header,cf_cv_func_openpty,[
+ cf_save_LIBS="$LIBS"
+ test $cf_cv_lib_util = yes && CF_ADD_LIB(util)
+ for cf_header in pty.h libutil.h util.h
+ do
+ AC_TRY_LINK([
+#include <$cf_header>
+],[
+ int x = openpty((int *)0, (int *)0, (char *)0,
+ (struct termios *)0, (struct winsize *)0);
+],[
+ cf_cv_func_openpty=$cf_header
+ break
+],[
+ cf_cv_func_openpty=no
+])
+ done
+ LIBS="$cf_save_LIBS"
+])
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_FUNC_POLL version: 4 updated: 2006/12/16 12:33:30
+dnl ------------
+dnl See if the poll function really works. Some platforms have poll(), but