Add autoconf checks for pthreads; fix #340

config/m4/find-func-no-libs.m4

@@ -0,0 +1,8 @@
+dnl Shamelessly stolen from Heimdal
+dnl
+dnl Look for function in any of the specified libraries
+dnl
+
+dnl AC_FIND_FUNC_NO_LIBS(func, libraries, includes, arguments, extra libs, extra args)
+AC_DEFUN([AC_FIND_FUNC_NO_LIBS], [
+AC_FIND_FUNC_NO_LIBS2([$1], ["" $2], [$3], [$4], [$5], [$6])])

config/m4/find-func-no-libs2.m4

@@ -0,0 +1,62 @@
+dnl Shamelessly stolen from Heimdal
+dnl
+dnl Look for function in any of the specified libraries
+dnl
+
+dnl AC_FIND_FUNC_NO_LIBS2(func, libraries, includes, arguments, extra libs, extra args)
+AC_DEFUN([AC_FIND_FUNC_NO_LIBS2], [
+
+AC_MSG_CHECKING([for $1])
+AC_CACHE_VAL(ac_cv_funclib_$1,
+[
+if eval "test \"\$ac_cv_func_$1\" != yes" ; then
+	ac_save_LIBS="$LIBS"
+	for ac_lib in $2; do
+		case "$ac_lib" in
+		"") ;;
+		yes) ac_lib="" ;;
+		no) continue ;;
+		-l*) ;;
+		*) ac_lib="-l$ac_lib" ;;
+		esac
+		LIBS="$6 $ac_lib $5 $ac_save_LIBS"
+		AC_LINK_IFELSE([AC_LANG_PROGRAM([[$3]],[[$1($4)]])],[eval "if test -n \"$ac_lib\";then ac_cv_funclib_$1=$ac_lib; else ac_cv_funclib_$1=yes; fi";break])
+	done
+	eval "ac_cv_funclib_$1=\${ac_cv_funclib_$1-no}"
+	LIBS="$ac_save_LIBS"
+fi
+])
+
+eval "ac_res=\$ac_cv_funclib_$1"
+
+if false; then
+	AC_CHECK_FUNCS($1)
+dnl	AC_CHECK_LIBS($2, foo)
+fi
+# $1
+eval "ac_tr_func=HAVE_[]upcase($1)"
+eval "ac_tr_lib=HAVE_LIB[]upcase($ac_res | sed -e 's/-l//')"
+eval "LIB_$1=$ac_res"
+
+case "$ac_res" in
+	yes)
+	eval "ac_cv_func_$1=yes"
+	eval "LIB_$1="
+	AC_DEFINE_UNQUOTED($ac_tr_func)
+	AC_MSG_RESULT([yes])
+	;;
+	no)
+	eval "ac_cv_func_$1=no"
+	eval "LIB_$1="
+	AC_MSG_RESULT([no])
+	;;
+	*)
+	eval "ac_cv_func_$1=yes"
+	eval "ac_cv_lib_`echo "$ac_res" | sed 's/-l//'`=yes"
+	AC_DEFINE_UNQUOTED($ac_tr_func)
+	AC_DEFINE_UNQUOTED($ac_tr_lib)
+	AC_MSG_RESULT([yes, in $ac_res])
+	;;
+esac
+AC_SUBST(LIB_$1)
+])

config/m4/find-func.m4

@@ -0,0 +1,9 @@
+dnl Shamelessly stolen from Heimdal
+dnl
+dnl AC_FIND_FUNC(func, libraries, includes, arguments)
+AC_DEFUN([AC_FIND_FUNC], [
+AC_FIND_FUNC_NO_LIBS([$1], [$2], [$3], [$4])
+if test -n "$LIB_$1"; then
+	LIBS="$LIB_$1 $LIBS"
+fi
+])

config/m4/misc.m4

@@ -0,0 +1,3 @@
+
+dnl Shamelessly stolen from Heimdal
+AC_DEFUN([upcase],[`echo $1 | tr abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ`])dnl