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[Bug libstdc++/59557] [4.8/4.9 Regression] Miscompilation after libstdc++ change


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59557

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Chris Jefferson from comment #3)
> Can I just confirm I am testing this code correctly?
> 
> caj@caj-laptop ~/Downloads> g++ BVH_Example.cpp -O0
> caj@caj-laptop ~/Downloads> ./a.out
> Brute force distance = 0.00428018, calls = 10000
> BVH distance         = 0.00428018, calls = 756
> caj@caj-laptop ~/Downloads> g++ -v
> Using built-in specs.
> COLLECT_GCC=g++
> COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.8/lto-wrapper
> Target: x86_64-linux-gnu
> Configured with: ../src/configure -v --with-pkgversion='Debian 4.8.2-10'
> --with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs
> --enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
> --program-suffix=-4.8 --enable-shared --enable-linker-build-id
> --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
> --with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls
> --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug
> --enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libmudflap
> --enable-plugin --with-system-zlib --disable-browser-plugin
> --enable-java-awt=gtk --enable-gtk-cairo
> --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64/jre
> --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64
> --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-amd64
> --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
> --enable-objc-gc --enable-multiarch --with-arch-32=i586 --with-abi=m64
> --with-multilib-list=m32,m64,mx32 --with-tune=generic
> --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
> --target=x86_64-linux-gnu
> Thread model: posix
> gcc version 4.8.2 (Debian 4.8.2-10)

Looks like so.  Werid, I definitely can reproduce with FSF 4.8.2 and SUSE 4.8.2
on x86_64.  Are the libstdc++ includes those from 4.8.2-10, too?


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