Compiling this file for NetWare, or, after pre-processing it and stripping down to a reasonably small one, natively for Linux produces "'d' is used uninitialized in this function". While the original code in libstdc++ looks broken (which will be reported as a separate bug), the warning and the generated code are incorrect, since 'd' definitely gets constructed at source level. Neither the waring nor the incorrect code generation can be observed at -O1. I will attach the stripped-down, usable on plain Linux, example in a second.
Created attachment 18238 [details] example source
Can you give a hint on what exactly is miscompiled? (the testcase isn't an executable one that fails if miscompiled...)
The library issue is PR40654.
Just as the warning says - construction of 'd' is missing. The warning lead me to look at the generated code, just to see that they are in sync (and hence perhaps have the same root cause).
Seems fixed in 4.5.x, at least, no warning. Otherwise, re-open.
In 4.5.3, the warning is gone but the code is still broken. In 4.6.1 the code is correct.