From d9a893b837890cddc71ea116e4d7e5b7bf9aadb8 Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <ian@airs.com>
Date: Fri, 9 Oct 2009 23:20:44 +0000
Subject: [PATCH] 	* configure.ac: Check for readv function also. 	*
 fileread.cc (readv): Define if not HAVE_READV. 	* fileread.h
 (File_read:: max_readv_entries): Set to 1 if readv 	does not exist. 
 * config.in: Regenerate. 	* configure: Regenerate.

---
 gold/ChangeLog    | 10 ++++++++++
 gold/config.in    |  3 +++
 gold/configure    |  2 +-
 gold/configure.ac |  2 +-
 gold/fileread.cc  |  9 +++++++++
 gold/fileread.h   |  6 ++++++
 6 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/gold/ChangeLog b/gold/ChangeLog
index 2b31fa68334..0072baa4f69 100644
--- a/gold/ChangeLog
+++ b/gold/ChangeLog
@@ -1,3 +1,13 @@
+2009-10-09  Andrew Pinski  <andrew_pinski@playstation.sony.com>
+	    Ian Lance Taylor  <iant@google.com>
+
+	* configure.ac: Check for readv function also.
+	* fileread.cc (readv): Define if not HAVE_READV.
+	* fileread.h (File_read:: max_readv_entries): Set to 1 if readv
+	does not exist.
+	* config.in: Regenerate.
+	* configure: Regenerate.
+
 2009-10-09  Doug Kwan  <dougkwan@google.com>
 
 	* layout.cc (Layout::make_output_section): Call target hook to make
diff --git a/gold/config.in b/gold/config.in
index 5fccefb5750..93d7517caa7 100644
--- a/gold/config.in
+++ b/gold/config.in
@@ -99,6 +99,9 @@
 /* Define to 1 if you have the `pread' function. */
 #undef HAVE_PREAD
 
+/* Define to 1 if you have the `readv' function. */
+#undef HAVE_READV
+
 /* Define to 1 if you have the <stdint.h> header file. */
 #undef HAVE_STDINT_H
 
diff --git a/gold/configure b/gold/configure
index 4fa30b8a69d..e4eb9fb82a9 100755
--- a/gold/configure
+++ b/gold/configure
@@ -6701,7 +6701,7 @@ fi
 
 done
 
-for ac_func in mallinfo posix_fallocate
+for ac_func in mallinfo posix_fallocate readv
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 ac_fn_cxx_check_func "$LINENO" "$ac_func" "$as_ac_var"
diff --git a/gold/configure.ac b/gold/configure.ac
index 2492c7a11b2..85e23f9ce45 100644
--- a/gold/configure.ac
+++ b/gold/configure.ac
@@ -338,7 +338,7 @@ AC_LANG_PUSH(C++)
 AC_CHECK_HEADERS(tr1/unordered_set tr1/unordered_map)
 AC_CHECK_HEADERS(ext/hash_map ext/hash_set)
 AC_CHECK_HEADERS(byteswap.h)
-AC_CHECK_FUNCS(mallinfo posix_fallocate)
+AC_CHECK_FUNCS(mallinfo posix_fallocate readv)
 AC_CHECK_DECLS([basename, ffs, asprintf, vasprintf, snprintf, vsnprintf, strverscmp, strndup, memmem])
 
 # Use of ::std::tr1::unordered_map::rehash causes undefined symbols
diff --git a/gold/fileread.cc b/gold/fileread.cc
index 02f0571a5d0..aed1c1d6428 100644
--- a/gold/fileread.cc
+++ b/gold/fileread.cc
@@ -40,6 +40,15 @@
 #include "descriptors.h"
 #include "fileread.h"
 
+#ifndef HAVE_READV
+struct iovec { void* iov_base; size_t iov_len };
+ssize_t
+readv(int, const iovec*, int)
+{
+  gold_unreachable();
+}
+#endif
+
 namespace gold
 {
 
diff --git a/gold/fileread.h b/gold/fileread.h
index 920a4da7b51..bdffdd15fec 100644
--- a/gold/fileread.h
+++ b/gold/fileread.h
@@ -370,7 +370,13 @@ class File_read
   { return (file_size + (page_size - 1)) & ~ (page_size - 1); }
 
   // The maximum number of entries we will pass to ::readv.
+#ifdef HAVE_READV
   static const size_t max_readv_entries = 128;
+#else
+  // On targets that don't have readv set the max to 1 so readv is not
+  // used.
+  static const size_t max_readv_entries = 1;
+#endif
 
   // Use readv to read data.
   void
-- 
2.30.2