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From: "cmetcalf at ezchip dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug math/17748] New: fe* function calls yield link namespace conform failures on dbl-64 hosts
Date: Mon, 22 Dec 2014 20:55:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=17748

            Bug ID: 17748
           Summary: fe* function calls yield link namespace conform
                    failures on dbl-64 hosts
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: cmetcalf at ezchip dot com

Looking at the conform/*/math.h/linknamespace results, it seems to be that 
SET_RESTORE_ROUND_53BIT in sysdeps/ieee754/dbl-64/s_sin.c (for example) calls 
through to feupdateenv() and other similar routines: 

[initial] __sqrt -> [libm.a(w_sqrt.o)] __ieee754_sqrt -> [libm.a(e_sqrt.o)]
fegetround
[initial] __sqrt -> [libm.a(w_sqrt.o)] __ieee754_sqrt -> [libm.a(e_sqrt.o)]
fesetenv
[initial] __cos -> [libm.a(s_sin.o)] feupdateenv
[initial] __remainder -> [libm.a(w_remainder.o)] __ieee754_remainder ->
[libm.a(e_remainder.o)] fegetenv
[initial] __asinh -> [libm.a(s_asinh.o)] __ieee754_sqrt -> [libm.a(e_sqrt.o)]
fegetround
[initial] __remainder -> [libm.a(w_remainder.o)] __ieee754_remainder ->
[libm.a(e_remainder.o)] fesetenv 

We should convert to using the __fe* names instead of the fe* names.  Machines
with inline libc_fe* definitions would not normally see these issues.

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