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"The build timeout" build failure(s) — clang 3.3

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The binary produced by clang is wrong when built with -D_FORTIFY_SOURCE=2. For example, the code:

#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>

int main ()
{
    char *data;
    int  pagesize;
    int fd, foo;
    pagesize = getpagesize ();
    fd = open ("conftest.mmap", O_RDWR);
    data = (char *) malloc (pagesize);
    foo = read (fd, data, pagesize);
}

compiled with:

clang++ -o conftest -g  -O2  -D_FORTIFY_SOURCE=2 conftest.cpp

will be stucked in an infinity loop. Reported upstream as bug 16821

No error detected for version 3.3

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