[Issue 4169] New: building dmd with a modern gcc produces a buggy compiler

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4169

           Summary: building dmd with a modern gcc produces a buggy
                    compiler
           Product: D
           Version: unspecified
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: braddr at puremagic.com


--- Comment #0 from Brad Roberts <braddr at puremagic.com> 2010-05-09 19:19:52 PDT ---
modern versions of DMD build with strict alias rules.  Somewhere in DMD the
rules are violated sufficiently to produce a compiler that doesn't work
correctly enough to past the test suite.  A mostly (but possibly not
completely) reduced test case:

----
import std.math;

void foo()
{
    float f[1];
    for (int i = 0; i < f.length; i++)
        assert(isnan(f[i]));
}


int main()
{
    foo();
    return 0;
}
----

With dmd as shipped, the test passes.  With dmd build with g++ 4.4, it fails. 
Adding -fno-strict-aliasing to the compilation flags for dmd produces a
compiler that works (at least well enough to pass the above test).

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