[tlbuild] dvisvgm-2.1 trial build

[Richard M. Koch]

Ken,

Google sent me to 

	http://stackoverflow.com/questions/10613126/what-are-the-differences-between-std-c11-and-std-gnu11 <http://stackoverflow.com/questions/10613126/what-are-the-differences-between-std-c11-and-std-gnu11>

for the answer to a question about the difference between.  -std=c++11 and -std=gnu++1. The answer
says the gnu flag allows extensions that are "implementation-defining" or "specifying things that the
standard is silent on."

The Mac and some flavors of BSD now favor clang; gcc is no longer provided by XCode.
Therefore I recommend -std=c++11.

Dick Koch


> On Feb 3, 2017, at 7:59 AM, Ken Brown <kbrow1i at gmail.com> wrote:
> 
> On 2/2/2017 6:01 PM, Karl Berry wrote:
>>    kb>
>>    -AX_CXX_COMPILE_STDCXX([11], [noext])
>>    +AX_CXX_COMPILE_STDCXX([11])
>> 
>> Ken, I sent the idea to Martin. Will see what he says.
>> 
>>    dk> Maybe this information could be used to fix then TeXLive source
>> 
>> Dick, I sent this info to Martin also. Better to make changes upstream
>> than in TL, if at all possible, after all.
> 
> Hi Karl and Martin,
> 
> I wonder if Dick's issue could be the same as mine.  I think his error messages all refer to types, functions, and constants that are not defined in ISO C/C++, so the fix might again be to use -std=gnu++11 or -D_DEFAULT_SOURCE.
> 
> Ken

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