Changeset 3436702

Timestamp:

10/26/05 16:32:07 (15 years ago)

Author:

Daniel Lawson <dlawson@…>

Branches:

4.0.1-hotfixes, cachetimestamps, develop, dpdk-ndag, etsilive, getfragoff, help, libtrace4, master, ndag_format, pfring, rc-4.0.1, rc-4.0.2, rc-4.0.3, rc-4.0.4, ringdecrementfix, ringperformance, ringtimestampfixes

Children:

767bd50

Parents:

6f75b9d

Message:

autoconf test for attribute((pure))

Files:

• configure.in (modified) (2 diffs)
• lib/libtrace.h (modified) (2 diffs)

configure.in

@@ -121 +121 @@
 AC_PROG_GCC_TRADITIONAL
 AC_CHECK_FUNCS(socket strdup)
+
+# configure time option for __attribute__((pure))
+test_pure=true
+AC_ARG_WITH(pure,
+            AC_HELP_STRING([--with-pure],
+                           [use __attribute__((pure)) for optimisation]),
+[
+        if test "$withval" = no
+        then 
+                test_pure=false
+        else
+                test_pure=true
+        fi
+],[
+        test_pure=true 
+]) 
+
+libtrace_pure=false
+if test "$test_pure" = true; then
+        AC_MSG_CHECKING([if compiler supports __attribute__((pure))])
+        AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+                           [[#define SIMPLE_FUNCTION __attribute__((pure))]])],
+                [AC_DEFINE(HAVE_ATTR_PURE,1,[define to test for __attribute__((pure)) support]) libtrace_pure=true],
+                [AC_DEFINE(HAVE_ATTR_PURE,0,[define to test for __attribute__((pure)) support]) libtrace_pure=false])
+
+        AC_MSG_RESULT($libtrace_pure)
+fi
 
 # configure time options for man pages
@@ -288 +315 @@
 reportopt "Compiled with PCAP support" $libtrace_pcap
 reportopt "Compiled with compressed trace (zlib) support" $libtrace_zlib
+reportopt "Compiled with __attribute__((pure))" $libtrace_pure
 reportopt "Compiled with DAG support (libdag)" $libtrace_dag
 reportopt "Compiled with DAG support (DAG 2.4)" $libtrace_dag2_4

lib/libtrace.h

@@ -34 +34 @@
 #include <sys/types.h>
 #include <netinet/in.h>
+#include "config.h"
 
 /** API version as 2 byte hex digits, eg 0xXXYYZZ */
@@ -45 +46 @@
  * parameters, used to hint gcc's optimisations
  */
-#define SIMPLE_FUNCTION __attribute__((pure))
+#ifdef HAVE_ATTR_PURE
+#  define SIMPLE_FUNCTION __attribute__((pure))
+#else
+#  define SIMPLE_FUNCTION
+#endif
+        
 
 /** @file