error/warning: left shift of negative value about dynamic_bitset

[mclow]

Since I complained about your proposed fix, I'll take a look at this.

[mclow]

I'm not getting these warnings with clang. I'll try with gcc.

[olk]

b2 toolset=gcc cxxflags="-std=c++17 -W -Wall -Werror" -j 32

dyn_bitset_unit_tests2.cpp:285:33: von hier erfordert
../../../boost/dynamic_bitset/dynamic_bitset.hpp:1953:57: Fehler: left shift of negative value [-Werror=shift-negative-value]
block_type const mask = (~static_cast(0) << extra_bits);

gcc -v: gcc-Version 7.2.1

[mclow]

Must be a new warning with 7.2; I don't get them with 7.1.
/me Off to install a newer version....

[olk]

got this with gcc-6.3.0 too using the develop branch

[mclow]

Ok - c++17 is the key.

[olk]

b2 toolset=gcc cxxflags="-std=c++11 -W -Wall -Werror" -j 32 produces the same error (Arch Linux, gcc-7.2.1)

[mclow]

Fixed in d3eb4fa

[olk]

fix works, thx

[igorsugak]

I just discovered this same bug with UBSAN:
dynamic_bitset.hpp:1943:55: runtime error: left shift of negative value -1
Thank you for fixing this!