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

[Ferro, A. <Ala...@me...>]

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