Hi,all:
 I am trying to compile “glibc-2.32” on ppc64le/alpine:3.11. when I run “../configure —prefix=/usr” ,the following error occurs:


checking whether gcc -g -O2 -mlong-double-128 uses IBM extended format... no
checking whether gcc -g -O2 supports -mabi=ibmlongdouble... no
configure: error: this configuration requires -mlong-double-128 IBM extended format support
/glibc-2.32/build # 


It seems that gcc does not support IBM extended format right now.


Is it possible to solve this problem by providing a patch or a full solution in next higher version alpine gcc ?


Thanks a lot !

Hello,

On Tuesday, 5 January 2021 05:54:36 MST isixfiveyou wrote:
> Hi,all:
>  I am trying to compile “glibc-2.32” on ppc64le/alpine:3.11. when I run
> “../configure —prefix=/usr” ,the following error occurs:
> 
> 
> checking whether gcc -g -O2 -mlong-double-128 uses IBM extended format... no
> checking whether gcc -g -O2 supports -mabi=ibmlongdouble... no
> configure: error: this configuration requires -mlong-double-128 IBM extended
> format support /glibc-2.32/build #

Alpine only supports IEEE format for long doubles.  We have no plans to 
support the legacy IBM format.

Also, it is not advisable to use glibc on Alpine systems, this is an entirely 
unsupported configuration.  Use gcompat instead, it provides compatibility for 
most glibc applications while being correctly integrated into the Alpine 
system.

Ariadne