fail to build openblas

[Matthew Rennekamp]

I downloaded 7.5.1 from source 3x, (2x were git cloning and once from files.sagemath.org), and <make> failed. I can interpret 

Makefile:123: *** OpenBLAS: Detecting CPU failed. Please set TARGET explicitly, e.g. make TARGET=your_cpu_target. Please read README for the detail..  Stop.

, but then I also tried <make TARGET=x86_64> + <make TARGET=x86> and the build still failed.

My system is running Fedora 25, on my HP laptop w/ an Intel Celeron N2830. (http://ark.intel.com/products/81071/Intel-Celeron-Processor-N2830-1M-Cache-up-to-2_41-GHz).

I'll try the sage-7.5.1-Fedora_24-x86_64 binary to see if that works.... though I could simply use the sagemath package in the Fedora repos.

[Steven Trogdon]

These are the supported X86/X86_64

a)Intel CPU:

P2

KATMAI

COPPERMINE

NORTHWOOD

PRESCOTT

BANIAS

YONAH

CORE2

PENRYN

DUNNINGTON

NEHALEM

SANDYBRIDGE

HASWELL

ATOM

I guess you could try 'make TARGET=ATOM'. As a last resort './configure --with-blas=atlas && make'. But I wouldn't do this until all the TARGETS had been exhausted. Building atlas may take for ever. See  https://trac.sagemath.org/ticket/21561#comment:5  for amd archs that have problems.

[Dima Pasechnik]

a quicker option is to use system's Atlas. This is described in the installation manual, where various environment variables are discussed.

[Matthew Rennekamp]

checking whether we are using the GNU Fortran compiler... no

checking whether  accepts -g... no

checking how to run the C++ preprocessor... /lib/cpp

configure: error: in `/home/mrennekamp/Downloads/sage-7.5.1':

configure: error: C++ preprocessor "/lib/cpp" fails sanity check

See `config.log' for more details

I had to do a fresh install of my OS. Now I can't get through configuration before building. I get a problem with the C++ preprocessor. Sage then tells me to check the config.log, which I don't know what is/isn't relevant, so I attached it all. 

Does sage-support do this stuff too?

[Dima Pasechnik]

it appears that you don't have c++ compiler (command g++) installed.

(installing gcc does not always install all of its parts; you need g++ and gfortran too)

[Matthew Rennekamp]

I have the gcc package installed (along with gcc-c++ and gcc-fortran). Well, I guess that means I'll use the sagemath package in the repos.

Consider this done...?

[Dima Pasechnik]

"installed" need not be equal to "working" (your log says that you have problems with them, what sort of problems is harder to say)

[Matthew Rennekamp]

"installed" need not be equal to "working" (your log says that you have problems with them, what sort of problems is harder to say)

Well, yeah, you're right. I don't think that anything needs to be done in terms of getting other help or doing something about it; thank you (and Steven) for input.