On Sunday, October 25, 2015 at 7:33:05 AM UTC-4, Jeffrey Walton wrote:
>
> It looks like the GCC compiler is broken for RDSEED on Cygwin and MinGW
> (RDRAND gear is fine). Here's a test under Cygwin-X86. Cygwin-X64 produced
> a similar error
>
> g++ -DNDEBUG -g2 -O3 -maes -msse4 -msse3 -msse2 -mrdrnd -mrdseed -Wall
> -march=native -c rdrand.cpp
> rdrand.cpp: In function ‘int CryptoPP::GCC_RSI_GenerateBlock(byte*,
> size_t, unsigned int)’:
> rdrand.cpp:616:51: error: ‘__builtin_ia32_rdseed32_step’ was not
> declared in this scope
> if (__builtin_ia32_rdseed32_step((word32*)output))
> ^
> rdrand.cpp:634:40: error: ‘__builtin_ia32_rdseed32_step’ was not
> declared in this scope
> if (__builtin_ia32_rdseed32_step(&val))
> ^
> GNUmakefile:414: recipe for target 'rdrand.o' failed
> make: *** [rdrand.o] Error 1
>
> As far as I know, __builtin_ia32_rdseed{16|32|64}_step are the only
> functions semi-documented by GCC. Confer,
> https://gcc.gnu.org/onlinedocs/gcc/x86-Built-in-Functions.html.
> Everything else is undocumented (counter examples are welcomed).
>
This issue appears to be wider spread than I thought. I'm catching failures
under Debian 8, too.
Jeff
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