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link-check sched_setaffinity

RFC PATCH New Jan Kiszka 1 participant 1 message Jun 12, 2007

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Jan Kiszka

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RFC PATCH 1/1 link-check sched_setaffinity

Hi,

as indicated earlier, there is an issue with uClibc from the blackfin
distribution: AC_TRY_COMPILE succeeds, but linking later on fails.

So my suggestion is to try to link already during configure (and test for missing defines differently).

Jan

configure.in +2 -2
Index: configure.in
===================================================================
@@ -516,12 +516,12 @@
 AC_CACHE_VAL(ac_cv_sched_setaffinity,
  save_CFLAGS="$CFLAGS"
  CFLAGS="-Wimplicit-function-declaration -Werror -D_GNU_SOURCE"
- [AC_TRY_COMPILE([#include <sched.h>],
+ [AC_TRY_LINK([#include <sched.h>],
  [cpu_set_t cpu_set; sched_setaffinity(0, sizeof(cpu_set), &cpu_set);],
  [ac_cv_sched_setaffinity=new],
  [ac_cv_sched_setaffinity=bad])]
  if test $ac_cv_sched_setaffinity = bad ; then
-   [AC_TRY_COMPILE([#include <sched.h>],
+   [AC_TRY_LINK([#include <sched.h>],
    [cpu_set_t cpu_set; sched_setaffinity(0, &cpu_set);],
    [ac_cv_sched_setaffinity=old],
    [ac_cv_sched_setaffinity=no])]
testsuite/switchtest/switchtest.c +2 -0
Index: src/testsuite/switchtest/switchtest.c
===================================================================
@@ -27,8 +27,10 @@
 typedef unsigned long cpu_set_t;
 #endif
 #define do_sched_setaffinity(pid,len,mask) 0
+#ifndef CPU_ZERO
 #define	 CPU_ZERO(set)		do { *(set) = 0; } while(0)
 #define	 CPU_SET(n,set) 	do { *(set) |= (1 << n); } while(0)
+#endif
 #endif /* HAVE_OLD_SETAFFINITY */
 #endif /* HAVE_RECENT_SETAFFINITY */
testsuite/clocktest/clocktest.c +3 -0
Index: src/testsuite/clocktest/clocktest.c
===================================================================
@@ -18,6 +18,7 @@
 
 #include <errno.h>
 #include <pthread.h>
+#include <sched.h>
 #include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>

@@ -35,8 +36,10 @@
 typedef unsigned long cpu_set_t;
 #endif
 #define sched_setaffinity(pid, len, mask)	do { } while (0)
+#ifndef CPU_ZERO
 #define CPU_ZERO(set)				memset(set, 0, sizeof(*set))
 #define CPU_SET(n, set)				do { } while (0)
+#endif
 #endif /* !HAVE_OLD_SETAFFINITY */
 #endif /* !HAVE_RECENT_SETAFFINITY */