[Bug middle-end/38503] [4.4 regression] warnings from -isystem headers strikes back.

[pluto at agmk dot net]

------- Comment #7 from pluto at agmk dot net  2009-01-12 15:10 -------
(In reply to comment #5)
> I can't seem to compile the preprocessed source:

i've attached a new full archive.

$ make
rm -f *.ii *.o *.s
/local/devel/toolchain44/x86_64-gnu-linux/bin/x86_64-gnu-linux-g++ -c -Wall -O2
-g0 -fPIC --save-temps -isystem ./sys-headers bug.cpp
bug.cpp: In function 'void foo()':
bug.cpp:6: warning: dereferencing pointer '<anonymous>' does break
strict-aliasing rules
./sys-headers/boost/optional/optional.hpp:315: note: initialized from here
bug.cpp:6: warning: dereferencing pointer '<anonymous>' does break
strict-aliasing rules
./sys-headers/boost/optional/optional.hpp:594: note: initialized from here

> Note that the warning is from bug.cpp:6, not a system header anyway

looks weird, because i can't see any dereferencing in bug.cpp:6
there's only trivial cctor which copies an enum.

for me it looks like the <warning> comes from boost::optional::
::aligned_storage::adress() manipulations inside boost system headers.

> (the _note_ is from a system header, do you want that to disappear?)

i want to disappear'em all :-)


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38503