On Tue, Apr 5, 2016 at 8:53 AM, alexander.stottmeister via sage-devel
<sage-devel@googlegroups.com> wrote:
> I faced the same error, which appears to be caused by gcc-5.3.0. After
> downgrading to gcc-4.9.3, brial compiled successfully.
> I am now stuck with a segmentation fault related to doc-html.

I'm starting to work on Cygwin builds now myself. I've gone ahead and
created a ticket + patch for the MPFR issue:

http://trac.sagemath.org/ticket/20380

Now I've hit the same issue with brial.  Downgrading gcc is not a
solution as far as I'm concerned so I'll see if I can understand this
issue and find out what's going on.  No idea yet about doc-html.

> Am Mittwoch, 30. März 2016 19:15:14 UTC+2 schrieb Witold Żarowski:
>>
>> I can confirm that I was able to compile mprf using the patch you
>> provided.
>> Then ATLAS was compiling for ages, and after that another error occurred,
>> this time compiling brial:
>> ========================================
>> libtool: compile:  g++ -DHAVE_CONFIG_H -I.
>> -I../../libpolybori/include/polybori -I../../groebner/include
>> -I../../libpolybori/include -std=c++98 -ftemplate-depth-100 -g -O2 -MT
>> BlockDegLexOrder.lo -MD -MP -MF .deps/BlockDegLexOrder.Tpo -c
>> BlockDegLexOrder.cc  -DDLL_EXPORT -DPIC -o .libs/BlockDegLexOrder.o
>> In file included from
>> ../../libpolybori/include/polybori/cudd/../../../../Cudd/cudd/cudd.h:90:0,
>>                  from ../../libpolybori/include/polybori/cudd/cudd.h:20,
>>                  from ../../libpolybori/include/polybori/pbori_defs.h:27,
>>                  from
>> ../../libpolybori/include/polybori/BlockDegLexOrder.h:19,
>>                  from BlockDegLexOrder.cc:18:
>> /usr/lib/gcc/x86_64-pc-cygwin/5.3.0/include/c++/cstdio:175:11: error:
>> '::snprintf' has not been declared
>>    using ::snprintf;
>>            ^
>> /usr/lib/gcc/x86_64-pc-cygwin/5.3.0/include/c++/cstdio:176:11: error:
>> '::vfscanf' has not been declared
>>    using ::vfscanf;
>>            ^
>> ========================================
>
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