On 9/5/21 11:20 PM, Sandra Loosemore wrote:

> Unless the aarch64 maintainers think it is a bug that __float128 is not 
> supported, I think the right solution here is the one I was thinking of 
> previously, to fix the Fortran front end to tie the C_FLOAT128 kind to 
> _Float128 rather than __float128, and fix the runtime support and test 
> cases accordingly.  Then there should be no need to depend on quadmath.h 
> at all.  C_FLOAT128 is a GNU extension and _Float128 is supported on a 
> superset of targets that __float128 is, so there should be no issue with 
> backward compatibility.

Here's a new patch that does this.  I've tested it on x86_64-linux-gnu, 
powerpc64le-linux-gnu, and aarch64-linux-gnu, and it does fix the 
previously reported failure compiling gfortran.dg/PR100914.c on aarch64. 
  OK to commit?

-Sandra