internal-externc-isystem /usr/include/x86_64-linux-gnu \ The compiler options which worked clean, the compiler part is stripped down, the linker part 'original'. that's mostly understood, I'm striving for decimal correct math, and above is just one point i want to get from the list as 'not injecting more imprecision than unavoidable'. no dicussions about powers being imprecise in general for negative i, i > 22 for doubles, i>27 for 80-bit long doubles, the small impact on precision and that such precision is overtuning. I mean I had seen partly options 'exp10l()' and partly or similar with 'nm', but not sure. I could produce a cross language library, alas needing '-shared' and '-fpic' for that which don't play together with '-cc1' that reduces this path to weaker results. '-cc1' seems to be a special option not available for other compilers, i don't have info what it changes 'behind the scenes', build a shared library with C++ that is 'pure C compatible' ( 'extern C'? ) and use that inside the project, ( it's above my skills / capa to change the compiler for the whole project, ) or get access to the good results, calculating routine, library or whatever from a 'pure C' compiler, 10^4933 and compares them to E-string evaluation. i can provide a test-batch which calculates the powers from 10^-4952.
Icpx compiles using clang++, with options '-cc1' and '-x c++' and a bunch of other options and includes. 'just by chance', poking around, trying Intel icpx I got a clean compilation using 'exp10l( i )' with 80-bit long doubles on a Lenovo P70 Xeon machine under Debian Linux, but couldn't migrate it to other compilers / options. The general idea is to want / need 'clean powers' regarding rounding, and consistency with other SW / ver., and that the '1Ei' calculation is correct (ASY), but slow reg. 'varying', but any combination producing some to plenty fails. the used compiler / language ( gcc, g++, clang, clang++, icx, icpx, dpcpp. I have a problem that clear integer powers of ten, ( '10^i' with i being integer ) are varying with: me not being used to the usance's here and not a native speaker. Hello sorry for writing as a 'newbie', pls.
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