[LLVMbugs] [Bug 17320] New: Can't assign PTHREAD_MUTEX_INITIALIZER to a class member

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17320

            Bug ID: 17320
           Summary: Can't assign PTHREAD_MUTEX_INITIALIZER to a class
                    member
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: bero at lindev.ch
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 11261
  --> http://llvm.org/bugs/attachment.cgi?id=11261&action=edit
sample code showing failures and workaround

This code fails to compile, saying "expected expression" where it sees
PTHREAD_MUTEX_INITIALIZER:

#include <pthread.h>
class Test {
    pthread_mutex_t m;
    Test();
};

Test::Test():m(PTHREAD_MUTEX_INITIALIZER) {}

A variant of this, initializing through = assignment, fails as well, with the
same error:

#include <pthread.h>
class Test {
    pthread_mutex_t m;
    Test();
};

Test::Test() {
    m = PTHREAD_MUTEX_INITIALIZER;
}

This is fine, though:

#include <pthread.h>
static const pthread_mutex_t __pthread_mutex_initializer =
PTHREAD_MUTEX_INITIALIZER;
class Test {
    pthread_mutex_t m;
    Test();
};

Test::Test():m(__pthread_mutex_initializer) {}


I've verified this on Linux with glibc (where PTHREAD_MUTEX_INITIALIZER is { {
0, 0, 0, 0, 0, __PTHREAD_SPINS, { 0, 0 } } } and Android (where
PTHREAD_MUTEX_INITIALIZER is { 0 }.

clang trunk svn rev. 190913.

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