kosaki	2010-06-23 21:48:31 +0900 (Wed, 23 Jun 2010)

  New Revision: 28404

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=28404

  Log:
    * configure.in: avoid getcontext() overhead if possible.
            [ruby-core:27380][Bug #2553]
            Thanks, Joe Damato, Dan Peterson and Patrick Mohr.

  Modified files:
    branches/ruby_1_8/ChangeLog
    branches/ruby_1_8/configure.in

Index: ruby_1_8/configure.in
===================================================================
--- ruby_1_8/configure.in	(revision 28403)
+++ ruby_1_8/configure.in	(revision 28404)
@@ -587,7 +587,7 @@
 		 fcntl.h sys/fcntl.h sys/select.h sys/time.h sys/times.h sys/param.h\
 		 syscall.h pwd.h grp.h a.out.h utime.h memory.h direct.h sys/resource.h \
 		 sys/mkdev.h sys/utime.h netinet/in_systm.h float.h ieeefp.h \
-		 ucontext.h intrinsics.h time.h)
+		 intrinsics.h time.h)
 
 dnl Check additional types.
 AC_CHECK_SIZEOF(rlim_t, 0, [
@@ -1146,8 +1146,22 @@
        fi
     fi
 fi
-if test x"$ac_cv_header_ucontext_h" = xyes; then
-    if test x"$rb_with_pthread" = xyes; then
+
+use_context=no
+if test x"$rb_with_pthread" = xyes; then
+    AS_CASE("$target_cpu:$target_os:$cross_compiling",
+    [*:linux*:no], [
+        if test -n "`(/lib/libc.so.6 2>/dev/null | fgrep 'Native POSIX Threads') 2> /dev/null`"; then
+	    use_context=yes
+	fi
+    ],
+    [sparc*], [
+    	use_context=yes
+    ])
+fi
+if test x"$use_context" = xyes; then
+    AC_CHECK_HEADERS(ucontext.h)
+    if test x"$ac_cv_header_ucontext_h" = xyes; then
 	AC_CHECK_FUNCS(getcontext setcontext)
     fi
 fi
Index: ruby_1_8/ChangeLog
===================================================================
--- ruby_1_8/ChangeLog	(revision 28403)
+++ ruby_1_8/ChangeLog	(revision 28404)
@@ -1,3 +1,9 @@
+Wed Jun 23 21:36:45 2010  Nobuyoshi Nakada  <nobu@r...>
+
+	* configure.in: avoid getcontext() overhead if possible.
+	[ruby-core:27380][Bug #2553]
+	Thanks, Joe Damato, Dan Peterson and Patrick Mohr.
+
 Tue Jun 22 21:33:23 2010  Nobuyoshi Nakada  <nobu@r...>
 
 	* test/optparse/test_summary.rb: fixed superclass so that it run

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