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Date: Mon, 15 Feb 2016 15:11:22 -0500
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: test results from latest git
On Mon, Feb 15, 2016 at 09:05:40PM +0100, Waldemar Brodkorb wrote:
> Hi,
> Szabolcs Nagy wrote,
>
> > * Waldemar Brodkorb <wbx@...nadk.org> [2016-02-15 17:45:11 +0100]:
> > >
> > > I uploaded latest test results from embedded-test here:
> > > http://tests.embedded-test.org/musl/git-14022016/
> > >
> >
> > hm, almost all armv7 float/math tests failed
> >
> > can you give some info about the toolchain? (gcc -v)
> > and the armv6 one for comparision? (which seems to work)
>
> ARMv6:
> usr/bin/arm-openadk-linux-musleabihf-gcc -v
> Using built-in specs.
> COLLECT_GCC=./openadk/toolchain_qemu-arm-realview-eb-mpcore_musl_arm_hard_eabihf/usr/bin/arm-openadk-linux-musleabihf-gcc
> COLLECT_LTO_WRAPPER=/home/wbx/embedded-test/openadk/toolchain_qemu-arm-realview-eb-mpcore_musl_arm_hard_eabihf/usr/libexec/gcc/arm-openadk-linux-musleabihf/5.3.0/lto-wrapper
> Target: arm-openadk-linux-musleabihf
> Configured with:
> /home/wbx/embedded-test/openadk/toolchain_build_qemu-arm-realview-eb-mpcore_musl_arm_hard_eabihf/w-gcc-5.3.0-1/gcc-5.3.0/configure
> --prefix=/home/wbx/embedded-test/openadk/toolchain_qemu-arm-realview-eb-mpcore_musl_arm_hard_eabihf/usr
> --with-bugurl=http://www.openadk.org/ --build=x86_64-linux-gnu
> --host=x86_64-linux-gnu --target=arm-openadk-linux-musleabihf
> --with-gmp=/home/wbx/embedded-test/openadk/host_x86_64-linux-gnu/usr
> --with-mpfr=/home/wbx/embedded-test/openadk/host_x86_64-linux-gnu/usr
> --with-libelf=/home/wbx/embedded-test/openadk/host_x86_64-linux-gnu/usr
> --disable-__cxa_atexit --with-system-zlib --with-gnu-ld
> --with-gnu-as --disable-libsanitizer --disable-install-libiberty
> --disable-libitm --disable-libmudflap --disable-libgomp
> --disable-libcilkrts --disable-libquadmath
> --disable-libquadmath-support --disable-decimal-float
> --disable-libstdcxx-pch --disable-ppl-version-check
> --disable-cloog-version-check --without-ppl --without-cloog
> --without-isl --disable-nls --disable-lto --with-cpu=mpcore
> --with-float=hard --enable-tls --enable-threads --enable-libatomic
> --enable-shared=libstdc++,libgcc --disable-libssp --disable-biarch
> --disable-multilib --enable-cxx-flags=-fPIC --enable-languages=c,c++
> --with-build-sysroot='/../../target_qemu-arm-realview-eb-mpcore_musl_arm_hard_eabihf'
> --with-sysroot='/../../target_qemu-arm-realview-eb-mpcore_musl_arm_hard_eabihf'
> Thread model: posix
> gcc version 5.3.0 (GCC)
>
> ARMv7:
> usr/bin/arm-openadk-linux-musleabihf-gcc -v
> Using built-in specs.
> COLLECT_GCC=./openadk/toolchain_qemu-arm-vexpress-a9_musl_arm_hard_eabihf/usr/bin/arm-openadk-linux-musleabihf-gcc
> COLLECT_LTO_WRAPPER=/home/wbx/embedded-test/openadk/toolchain_qemu-arm-vexpress-a9_musl_arm_hard_eabihf/usr/libexec/gcc/arm-openadk-linux-musleabihf/5.3.0/lto-wrapper
> Target: arm-openadk-linux-musleabihf
> Configured with:
> /home/wbx/embedded-test/openadk/toolchain_build_qemu-arm-vexpress-a9_musl_arm_hard_eabihf/w-gcc-5.3.0-1/gcc-5.3.0/configure
> --prefix=/home/wbx/embedded-test/openadk/toolchain_qemu-arm-vexpress-a9_musl_arm_hard_eabihf/usr
> --with-bugurl=http://www.openadk.org/ --build=x86_64-linux-gnu
> --host=x86_64-linux-gnu --target=arm-openadk-linux-musleabihf
> --with-gmp=/home/wbx/embedded-test/openadk/host_x86_64-linux-gnu/usr
> --with-mpfr=/home/wbx/embedded-test/openadk/host_x86_64-linux-gnu/usr
> --with-libelf=/home/wbx/embedded-test/openadk/host_x86_64-linux-gnu/usr
> --disable-__cxa_atexit --with-system-zlib --with-gnu-ld
> --with-gnu-as --disable-libsanitizer --disable-install-libiberty
> --disable-libitm --disable-libmudflap --disable-libgomp
> --disable-libcilkrts --disable-libquadmath
> --disable-libquadmath-support --disable-decimal-float
> --disable-libstdcxx-pch --disable-ppl-version-check
> --disable-cloog-version-check --without-ppl --without-cloog
> --without-isl --disable-nls --disable-lto --with-cpu=cortex-a9
> --with-float=hard --with-fpu=neon-fp16 --enable-tls --enable-threads
> --enable-libatomic --enable-shared=libstdc++,libgcc --disable-libssp
> --disable-biarch --disable-multilib --enable-cxx-flags=-fPIC
> --enable-languages=c,c++
> --with-build-sysroot='/../../target_qemu-arm-vexpress-a9_musl_arm_hard_eabihf'
> --with-sysroot='/../../target_qemu-arm-vexpress-a9_musl_arm_hard_eabihf'
> Thread model: posix
> gcc version 5.3.0 (GCC)
>
> I do not configure any --with-fpu for ARMv6. Are NEON intrinsics the
> problem?
OK, Neon is almost certainly your problem. It should never be used as
the default for a toolchain because it produces non-IEEE-conforming
results. You can enable Neon for individual applications where you
don't care (just like -ffast-math) but using it to build libc will
result in a broken libc, and using it by default could break other
apps too. Perhaps we should add something to musl's configure to
detect this misconfiguration and error out or disable Neon?
Rich
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