Thrift: Revamp build to use a single configure.ac.

Summary:
Ben Maurer suggested that it would make sense for Thrift to build as
a single project, with one configure.ac and multiple Makefile.am.
He was also kind enough to do the heavy lifting, and this commit
is the application of his patch (with minor modifications).
The most significant visible change from this diff is that
in order to buidl one of the thrift sub-projects (i.e.: the compiler,
the C++ library, or the Python library) you must run bootstrap.sh
and configure in the Thrift root, then make in the specific project.
Users who want to build and install the Python library but
can't run configure because they don't have Boost can simply
run setup.py directly.

Reviewed By: mcslee

Test Plan: Built Thrift from scratch.

Revert Plan: ok


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665409 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 169 insertions, 0 deletions

diff --git a/aclocal/ax_lib_event.m4 b/aclocal/ax_lib_event.m4
new file mode 100644
index 000000000..9266df4f9
--- /dev/null
+++ b/aclocal/ax_lib_event.m4
@@ -0,0 +1,169 @@
+dnl @synopsis AX_LIB_EVENT([MINIMUM-VERSION])
+dnl
+dnl Test for the libevent library of a particular version (or newer).
+dnl
+dnl If no path to the installed libevent is given, the macro will first try
+dnl using no -I or -L flags, then searches under /usr, /usr/local, /opt,
+dnl and /opt/libevent.
+dnl If these all fail, it will try the $LIBEVENT_ROOT environment variable.
+dnl
+dnl This macro requires that #include <sys/types.h> works and defines u_char.
+dnl
+dnl This macro calls:
+dnl   AC_SUBST(LIBEVENT_CPPFLAGS)
+dnl   AC_SUBST(LIBEVENT_LDFLAGS)
+dnl   AC_SUBST(LIBEVENT_LIBS)
+dnl
+dnl And (if libevent is found):
+dnl   AC_DEFINE(HAVE_LIBEVENT)
+dnl
+dnl It also leaves the shell variables "success" and "ax_have_libevent"
+dnl set to "yes" or "no".
+dnl
+dnl NOTE: This macro does not currently work for cross-compiling,
+dnl       but it can be easily modified to allow it.  (grep "cross").
+dnl
+dnl @category InstalledPackages
+dnl @category C
+dnl @author David Reiss <dreiss@facebook.com>
+dnl @version 2007-09-12
+dnl @license AllPermissive
+
+dnl Input: ax_libevent_path, WANT_LIBEVENT_VERSION
+dnl Output: success=yes/no
+AC_DEFUN([AX_LIB_EVENT_DO_CHECK],
+         [
+          # Save our flags.
+          CPPFLAGS_SAVED="$CPPFLAGS"
+          LDFLAGS_SAVED="$LDFLAGS"
+          LIBS_SAVED="$LIBS"
+          LD_LIBRARY_PATH_SAVED="$LD_LIBRARY_PATH"
+
+          # Set our flags if we are checking a specific directory.
+          if test -n "$ax_libevent_path" ; then
+            LIBEVENT_CPPFLAGS="-I$ax_libevent_path/include"
+            LIBEVENT_LDFLAGS="-L$ax_libevent_path/lib"
+            LD_LIBRARY_PATH="$ax_libevent_path/lib:$LD_LIBRARY_PATH"
+          else
+            LIBEVENT_CPPFLAGS=""
+            LIBEVENT_LDFLAGS=""
+          fi
+
+          # Required flag for libevent.
+          LIBEVENT_LIBS="-levent"
+
+          # Prepare the environment for compilation.
+          CPPFLAGS="$CPPFLAGS $LIBEVENT_CPPFLAGS"
+          LDFLAGS="$LDFLAGS $LIBEVENT_LDFLAGS"
+          LIBS="$LIBS $LIBEVENT_LIBS"
+          export CPPFLAGS
+          export LDFLAGS
+          export LIBS
+          export LD_LIBRARY_PATH
+
+          success=no
+
+          # Compile, link, and run the program.  This checks:
+          # - event.h is available for including.
+          # - event_get_version() is available for linking.
+          # - The event version string is lexicographically greater
+          #   than the required version.
+          AC_LANG_PUSH([C])
+          dnl This can be changed to AC_LINK_IFELSE if you are cross-compiling,
+          dnl but then the version cannot be checked.
+          AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+          #include <sys/types.h>
+          #include <event.h>
+          ]], [[
+          const char* lib_version = event_get_version();
+          const char* wnt_version = "$WANT_LIBEVENT_VERSION";
+          for (;;) {
+            /* If we reached the end of the want version.  We have it. */
+            if (*wnt_version == '\0') {
+              return 0;
+            }
+            /* If the want version continues but the lib version does not, */
+            /* we are missing a letter.  We don't have it. */
+            if (*lib_version == '\0') {
+              return 1;
+            }
+            /* If we have greater than what we want.  We have it. */
+            if (*lib_version > *wnt_version) {
+              return 0;
+            }
+            /* If we have less, we don't. */
+            if (*lib_version < *wnt_version) {
+              return 1;
+            }
+            lib_version++;
+            wnt_version++;
+          }
+          return 0;
+          ]])], [
+          success=yes
+          ])
+          AC_LANG_POP([C])
+
+          # Restore flags.
+          CPPFLAGS="$CPPFLAGS_SAVED"
+          LDFLAGS="$LDFLAGS_SAVED"
+          LIBS="$LIBS_SAVED"
+          LD_LIBRARY_PATH="$LD_LIBRARY_PATH_SAVED"
+         ])
+
+
+AC_DEFUN([AX_LIB_EVENT],
+         [
+
+          dnl Allow search path to be overridden on the command line.
+          AC_ARG_WITH([libevent],
+                      AS_HELP_STRING([--with-libevent@<:@=DIR@:>@], [use libevent (default is yes) - it is possible to specify an alternate root directory for libevent]),
+                      [
+                       if test "x$withval" = "xno"; then
+                         want_libevent="no"
+                       elif test "x$withval" = "xyes"; then
+                         want_libevent="yes"
+                         ax_libevent_path=""
+                       else
+                         want_libevent="yes"
+                         ax_libevent_path="$withval"
+                       fi
+                       ],
+                       [ want_libevent="yes" ; ax_libevent_path="" ])
+
+
+          if test "$want_libevent" = "yes"; then
+            WANT_LIBEVENT_VERSION=ifelse([$1], ,1.2,$1)
+
+            AC_MSG_CHECKING(for libevent >= $WANT_LIBEVENT_VERSION)
+
+            # Run tests.
+            if test -n "$ax_libevent_path"; then
+              AX_LIB_EVENT_DO_CHECK
+            else
+              for ax_libevent_path in "" /usr /usr/local /opt /opt/libevent "$LIBEVENT_ROOT" ; do
+                AX_LIB_EVENT_DO_CHECK
+                if test "$success" = "yes"; then
+                  break;
+                fi
+              done
+            fi
+
+            if test "$success" != "yes" ; then
+              AC_MSG_RESULT(no)
+              LIBEVENT_CPPFLAGS=""
+              LIBEVENT_LDFLAGS=""
+              LIBEVENT_LIBS=""
+            else
+              AC_MSG_RESULT(yes)
+              AC_DEFINE(HAVE_LIBEVENT,,[define if libevent is available])
+            fi
+
+            ax_have_libevent="$success"
+
+            AC_SUBST(LIBEVENT_CPPFLAGS)
+            AC_SUBST(LIBEVENT_LDFLAGS)
+            AC_SUBST(LIBEVENT_LIBS)
+          fi
+
+          ])