Re: [Msys2-users] glibc-devel (need fpu_control.h and features.h) ?

[Mirko V. <mir...@gm...>]

Thank you Alasdair,

I did more reading over the weekend, I came to understand that as
well.  I also started reading up on the link that you provided.

Mirko

On Mon, Mar 23, 2015 at 3:54 AM, Ferro, Alasdair
<Ala...@me...> wrote:
> Reformatted for clarity:
>
> My original message (edited):
>> I am trying to compile "Triangle" meshing software (see
>> http://www.cs.cmu.edu/~quake/triangle.html).
>>
>> It needs <fpu_control.h>, which seems to be part of glibc-devel (as
>> reported by rpm.pbone.net).
>>
>> But I could not find glibc-devel for msys2/mingw?
>>
>>
>
> A reply from Alasdair:
>
> On Fri, Mar 20, 2015 at 10:53 AM, Ferro, Alasdair
> <Ala...@me...> wrote:
>> Mirko,
>>
>> This page:
>>     http://www.fortran-2000.com/ArnaudRecipes/CompilerTricks.html#x86_PrecMode
>> shows how to do this on a number of platforms. You will need to modify the code to use the native Windows API for it.
>>
>> Alasdair
>
> Alasdair,
>
> Two comments:
>
> - OK, I  will dig into the code to adjust it.  As I see it, I need to
> ensure the computations are done in double precision
> mode, not the extended double precision (I have never dealt with
> numerics at that level).
>
> - I am puzzled as to why gcc on Linux has these header files but the
> MinGW one does not even though they are both
> for the same processor. For example, I have a VM rurnning Ubuntu on
> the same machine I have MSYS2 & MinGW.
> Why does one have the .h file and the other one does not?  Is it that
> noone has done it on MSYS2, or is there a more
> fundamental OS-related reson?
>
> Thanks,
>
> Mirko
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> Mirko,
>
> Strictly speaking those header files are not provided by GCC, they are part of the standard C library - on Linux this is glibc (GNU libc, hence the RPM package name). On Windows, MSYS does not try to replace the standard C library that is provided by Microsoft, therefore you must use whatever API Microsoft has to achieve the same result.
>
> Alasdair