[PATCH] testsuite: Use libstdc++ macro to check for pthread_cond_clockwait [PR 100655]

[Jonathan Wakely via Gcc-patches]

Also add dg-shouldfail to ignore failures due to ulimit.

gcc/testsuite/ChangeLog:

        PR testsuite/100655
        * g++.dg/tsan/pthread_cond_clockwait.C: Use libstdc++ macro to
        check for availability of pthread_cond_clockwait. Add
        dg-shouldfail.

Tested x86_64-linux (glibc 2.23) and powerpc64le-linux (glibc 2.17)

OK for trunk?



commit 86f5ac3b64a98280df6f0ea407eea8cde7c2edbd
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Thu May 20 12:40:07 2021

    testsuite: Use libstdc++ macro to check for pthread_cond_clockwait [PR 
100655]
    
    Also add dg-shouldfail to ignore failures due to ulimit.
    
    gcc/testsuite/ChangeLog:
    
            PR testsuite/100655
            * g++.dg/tsan/pthread_cond_clockwait.C: Use libstdc++ macro to
            check for availability of pthread_cond_clockwait. Add
            dg-shouldfail.

diff --git a/gcc/testsuite/g++.dg/tsan/pthread_cond_clockwait.C 
b/gcc/testsuite/g++.dg/tsan/pthread_cond_clockwait.C
index 82d6a5c8329..c6c621bea51 100644
--- a/gcc/testsuite/g++.dg/tsan/pthread_cond_clockwait.C
+++ b/gcc/testsuite/g++.dg/tsan/pthread_cond_clockwait.C
@@ -1,9 +1,14 @@
 // Test pthread_cond_clockwait not generating false positives with tsan
+/* { dg-shouldfail "tsan" } */
 // { dg-do run { target { { *-*-linux* *-*-gnu* *-*-uclinux* } && pthread } } }
 // { dg-options "-fsanitize=thread -lpthread" }
 
 #include <pthread.h>
 
+// Include this to get the libstdc++ _GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT
+// macro that indicates pthread_cond_clockwait is available.
+#include <type_traits>
+
 pthread_cond_t cv;
 pthread_mutex_t mtx;
 
@@ -23,7 +28,9 @@ int main() {
     struct timespec ts;
     clock_gettime(CLOCK_MONOTONIC, &ts);
     ts.tv_sec += 10;
+#ifdef _GLIBCXX_USE_PTHREAD_COND_CLOCKWAIT
     pthread_cond_clockwait(&cv, &mtx, CLOCK_MONOTONIC, &ts);
+#endif
     pthread_mutex_unlock(&mtx);
 
     pthread_join(tid, NULL);