* ext/curses/extconf.rb: Implement

  --with-curses-version={function,variable} configure option for
  cross-compiling.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40468 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 48 insertions, 30 deletions

diff --git a/ext/curses/extconf.rb b/ext/curses/extconf.rb
index f63de1cd6c..467494e190 100644
--- a/ext/curses/extconf.rb
+++ b/ext/curses/extconf.rb
@@ -77,39 +77,57 @@ if header_library
   # SVR4 curses has a (undocumented) variable char *curses_version.
   # ncurses and PDcurses has a function char *curses_version().
   # Note that the original BSD curses doesn't provide version information.
+  #
+  # configure option:
+  #   --with-curses-version=function    for SVR4
+  #   --with-curses-version=variable    for ncurses and PDcurses
+  #   (not given)                       automatically determined
 
-  prolog = cpp_include(curses)
-  if checking_for(checking_message('function curses_version', curses)) {
-      try_run(<<-"End")
-        #{prolog}
-        int main(int argc, char *argv[])
-        {
-            curses_version();
-            return EXIT_SUCCESS;
-        }
-      End
-    }
+  case with_curses_version = with_config("curses-version")
+  when "function"
     $defs << '-DHAVE_FUNC_CURSES_VERSION'
-  end
-
-  if checking_for(checking_message('variable curses_version', curses)) {
-      try_run(<<-"End")
-        #{prolog}
-        extern char *curses_version;
-        int main(int argc, char *argv[])
-        {
-            int i = 0;
-            for (i = 0; i < 100; i++) {
-                if (curses_version[i] == 0)
-                    return 0 < i ? EXIT_SUCCESS : EXIT_FAILURE;
-                if (curses_version[i] & 0x80)
-                    return EXIT_FAILURE;
-            }
-            return EXIT_FAILURE;
-        }
-      End
-    }
+  when "variable"
     $defs << '-DHAVE_VAR_CURSES_VERSION'
+  when nil
+    function_p = nil
+    variable_p = nil
+    if [header, library].any? {|v| /ncurses|pdcurses|xcurses/i =~ v }
+      function_p = true
+    end
+    if !CROSS_COMPILING
+      prolog = cpp_include(curses)
+      function_p = checking_for(checking_message('function curses_version', curses)) {
+        try_run(<<-"End")
+          #{prolog}
+          int main(int argc, char *argv[])
+          {
+              curses_version();
+              return EXIT_SUCCESS;
+          }
+        End
+      }
+      variable_p = checking_for(checking_message('variable curses_version', curses)) {
+        try_run(<<-"End")
+          #{prolog}
+          extern char *curses_version;
+          int main(int argc, char *argv[])
+          {
+              int i = 0;
+              for (i = 0; i < 100; i++) {
+                  if (curses_version[i] == 0)
+                      return 0 < i ? EXIT_SUCCESS : EXIT_FAILURE;
+                  if (curses_version[i] & 0x80)
+                      return EXIT_FAILURE;
+              }
+              return EXIT_FAILURE;
+          }
+        End
+      }
+    end
+    $defs << '-DHAVE_FUNC_CURSES_VERSION' if function_p
+    $defs << '-DHAVE_VAR_CURSES_VERSION' if variable_p
+  else
+    warn "unexpeted value for --with-curses-version: #{with_curses_version}"
   end
 
   create_makefile("curses")