Suspicion of a compiler bug in clang: using ternary operator in ereport()

Hi,

just a word of warning: it seems as if there is compiler bug in clang
regarding the ternary operator when used in ereport(). While working
on a patch I found that this code:

ereport(FATAL,
(errmsg("could not map anonymous shared memory: %m"),
(errno == ENOMEM) ?
errhint("This error usually means that PostgreSQL's request "
"for a shared memory segment exceeded available memory "
"or swap space. To reduce the request size (currently "
"%zu bytes), reduce PostgreSQL's shared memory usage, "
"perhaps by reducing shared_buffers or "
"max_connections.",
*size) : 0));

did not emit a errhint when using clang, although errno == ENOMEM was
true. The same code works with gcc. I used the same data dir, so
config was exactly the same, too.

I reported this bug at clang.org:

<http://llvm.org/bugs/show_bug.cgi?id=18644>

Best regards,

--
Christian Kruse http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services