[Bug bootstrap/54419] [4.8 Regression] Compiling libstdc++-v3/src/c++11/random.cc fails on platforms not knowing rdrand

[glisse at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54419

--- Comment #32 from Marc Glisse <glisse at gcc dot gnu.org> 2012-09-05 10:46:35 UTC ---
(In reply to comment #30)
> > Er, why should this test ever be run with the system compiler? libstdc++ should
> > only ever be built by a newly built g++.
> 
> The problem is not with the compiler, but with the (target?) assembler and
> possibly the target CPU.

Er, did you read comment #26? Jack says the configure test is being run with
clang, which if true looks like a bug.

(doesn't change the fact that this PR is about assembler support, but sometimes
studying one bug unearths other bugs)