From 26b193d548c05ba859407d60e28823f32d367d97 Mon Sep 17 00:00:00 2001
From: kosaki <kosaki@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 23 Jun 2010 12:48:31 +0000
Subject:         * configure.in: avoid getcontext() overhead if possible.     
    [ruby-core:27380][Bug #2553]         Thanks, Joe Damato, Dan Peterson and
 Patrick Mohr.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@28404 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog    |  6 ++++++
 configure.in | 20 +++++++++++++++++---
 2 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 0e89a822a2..c50b4deb81 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Wed Jun 23 21:36:45 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* 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@ruby-lang.org>
 
 	* test/optparse/test_summary.rb: fixed superclass so that it run
diff --git a/configure.in b/configure.in
index 363f7db9a8..3013cae5c9 100644
--- a/configure.in
+++ b/configure.in
@@ -587,7 +587,7 @@ AC_CHECK_HEADERS(stdlib.h string.h unistd.h limits.h sys/file.h sys/ioctl.h sys/
 		 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 @@ if test x"$enable_pthread" = xyes; then
        fi
     fi
 fi
-if test x"$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
-- 
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