groonga-httpd: enable mruby when --enable-mruby is specified

When mruby is enabled for groonga-httpd, mruby is built as
a loadable module (/etc/groonga/httpd/modulesngx_http_mruby_module.so)

configure.ac

@@ -1558,9 +1558,11 @@ if test "$enable_mruby" = "yes"; then
   fi
   AC_DEFINE(GRN_WITH_MRUBY, [1], [Define to 1 if mruby is enabled.])
   MRUBY_CFLAGS="-I\$(top_srcdir)/vendor/mruby-source/include"
+  GRN_WITH_MRUBY="yes"
 else
   MRUBY_CFLAGS=""
 fi
+AC_SUBST(GRN_WITH_MRUBY)
 AC_SUBST(MRUBY_CFLAGS)
 AM_CONDITIONAL(WITH_MRUBY, test "$enable_mruby" = "yes")
 

groonga-httpd-conf.sh.in

@@ -31,3 +31,4 @@ export GROONGA_HTTPD_WITH_ZLIB="@GRN_WITH_ZLIB@"
 export GROONGA_HTTPD_WITH_SSL="@GRN_WITH_SSL@"
 export GROONGA_HTTPD_SSL_CFLAGS="@SSL_CFLAGS@"
 export GROONGA_HTTPD_SSL_LIBS_ONLY_L="@SSL_LIBS_ONLY_L@"
+export GROONGA_HTTPD_WITH_MRUBY="@GRN_WITH_MRUBY@"

src/httpd/configure

@@ -86,6 +86,15 @@ if [ "${GROONGA_HTTPD_WITH_SSL}" = "yes" ]; then
   configure_args="${configure_args} --with-http_ssl_module"
 fi
 
+nginx_mruby_directory="${top_builddir}/vendor/ngx_mruby-source"
+mruby_directory="${top_srcdir}/vendor/mruby-source"
+if [ "${GROONGA_HTTPD_WITH_MRUBY}" = "yes" ]; then
+  cd "${nginx_mruby_directory}"
+  ./configure --with-ngx-src-root=${nginx_directory} --with-mruby-root=${mruby_directory}
+  make build_mruby_with_fpic
+  make generate_gems_config_dynamic
+  configure_args="${configure_args} --add-dynamic-module=${nginx_mruby_directory}"
+fi
 
 cd "${nginx_directory_in_build_directory}"