On 12/19/18 12:55 AM, Aurelien Jarno wrote: > On 2018-12-18 22:11, Aurelien Jarno wrote: >> On 2018-12-18 21:34, Aurelien Jarno wrote: >>> Hi, >>> >>> On 2018-12-18 15:15, Tim Ruehsen wrote: >>>> Package: libc6-armhf-cross >>>> Version: 2.28-2cross2 >>>> Severity: normal >>>> >>>> Dear Maintainer, >>>> >>>> currently strerror(-3) sets errno unexpectedly to ENOMEM (12). >>>> >>>> The expected errno value would be either EINVAL or not touching errno >>>> at all. >>>> >>>> This behavior is relatively new and causes some CI cross builds to fail. >>>> The failing test is a gnulib test (test-strerror.c). >>>> >>> >>> I can reproduce the issue with libc6-armhf-cross 2.28-2cross2 and >>> qemu-arm-static 1:3.1+dfsg-1, but not with the same binary on real >>> hardware nor on qemu-user-static 1:2.12+dfsg-3+b1. I would therefore >>> think it's a qemu bug. >> >> Hmm, I am wrong, I can actually reproduce it with qemu-user-static >> version 1:2.12+dfsg-3+b1. But I can't reproduce it on real hardware. > > It seems to have been caused by this upstream patch: > > | commit 1294b1892e19d70e9e4dca0a2f3e39497f262a42 > | Author: Wilco Dijkstra <wdijk...@arm.com> > | Date: Thu Mar 15 17:57:03 2018 +0000 > | > | Add support for sqrt asm redirects > | > | This patch series cleans up the many uses of __ieee754_sqrt(f/l) in > GLIBC. > | The goal is to enable GCC to do the inlining, and if this fails call the > | __ieee754_sqrt function. This is done by internally declaring sqrt > with asm > | redirects. The compat symbols and sqrt wrappers need to disable the > redirect. > | The redirect is also disabled if there are already redirects defined > when > | using -ffinite-math-only. > | > | All math functions (but not math tests, non-library code and libnldbl) > are > | built with -fno-math-errno which means GCC will typically inline sqrt > as a > | single instruction. This means targets are no longer forced to add a > special > | inline for sqrt. > | > | * include/math.h (sqrt): Declare with asm redirect. > | (sqrtf): Likewise. > | (sqrtl): Likewise. > | (sqrtf128): Likewise. > | * Makeconfig: Add -fno-math-errno for libc/libm, but build > testsuite, > | nonlib and libnldbl with -fmath-errno. > | * math/w_sqrt_compat.c: Define NO_MATH_REDIRECT. > | * math/w_sqrt_template.c: Likewise. > | * math/w_sqrtf_compat.c: Likewise. > | * math/w_sqrtl_compat.c: Likewise. > | * sysdeps/i386/fpu/w_sqrt.c: Likewise. > | * sysdeps/i386/fpu/w_sqrt_compat.c: Likewise. > | * sysdeps/generic/math-type-macros-float128.h: Remove math.h and > | complex.h. > > And more precisely by building libc with -fno-math-errno.
Thanks for looking into it. How is the proceeding ? Is there enough info to fix (or report upstream) ? If not, what has to be done ? Regards, Tim
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