commit: 3e3d3f661fa3df6911db31e7496951aa23497389 Author: Sergei Trofimovich <slyfox <AT> gentoo <DOT> org> AuthorDate: Sun Aug 23 10:19:03 2020 +0000 Commit: Sergei Trofimovich <slyfox <AT> gentoo <DOT> org> CommitDate: Sun Aug 23 10:19:16 2020 +0000 URL: https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=3e3d3f66
sys-libs/glibc: disable multiarch on ppc32 By default glibc does not enable multiarch on powerpc-unknown-linux-gnu targets. Bug triggers only when CFLAGS= enables power4 or above (like, CFLAGS=-mcpu=7450). multiarch does not work on ppc with cache-block not equal to 128 bytes and breaks memset implementations. There 'dcbz' instruction is used for optimization to zero out cache-block with zeros at a time. memset implementation assumes cache-block=128. G4 hardware and qemu-ppc both have cache-block=32. This means memset() zero-initializes only 32 of each 128-byte block including .sbss and .bss sections. This breaks glibc's locks and many other things. The change disables multiarch for pps32 in Gentoo until glibc is fixed upstream. Reported-by: Daniel Gurney Bug: https://sourceware.org/PR26522 Closes:https://bugs.gentoo.org/737996 Package-Manager: Portage-3.0.4, Repoman-3.0.1 Signed-off-by: Sergei Trofimovich <slyfox <AT> gentoo.org> sys-libs/glibc/glibc-2.31-r6.ebuild | 5 +++++ sys-libs/glibc/glibc-2.32.ebuild | 5 +++++ sys-libs/glibc/glibc-9999.ebuild | 5 +++++ 3 files changed, 15 insertions(+) diff --git a/sys-libs/glibc/glibc-2.31-r6.ebuild b/sys-libs/glibc/glibc-2.31-r6.ebuild index c010b578953..73a26abf452 100644 --- a/sys-libs/glibc/glibc-2.31-r6.ebuild +++ b/sys-libs/glibc/glibc-2.31-r6.ebuild @@ -420,6 +420,11 @@ want__thread() { use_multiarch() { # Allow user to disable runtime arch detection in multilib. use multiarch || return 1 + # multiarch does not work on ppc with cache-block not equal to 128 bytes + # and breaks memset: + # https://sourceware.org/PR26522 + # https://bugs.gentoo.org/737996 + [[ $(tc-arch ${CTARGET}) == ppc ]] && return 1 # Make sure binutils is new enough to support indirect functions, # #336792. This funky sed supports gold and bfd linkers. local bver nver diff --git a/sys-libs/glibc/glibc-2.32.ebuild b/sys-libs/glibc/glibc-2.32.ebuild index 2a750041ae4..a53946fa562 100644 --- a/sys-libs/glibc/glibc-2.32.ebuild +++ b/sys-libs/glibc/glibc-2.32.ebuild @@ -420,6 +420,11 @@ want__thread() { use_multiarch() { # Allow user to disable runtime arch detection in multilib. use multiarch || return 1 + # multiarch does not work on ppc with cache-block not equal to 128 bytes + # and breaks memset: + # https://sourceware.org/PR26522 + # https://bugs.gentoo.org/737996 + [[ $(tc-arch ${CTARGET}) == ppc ]] && return 1 # Make sure binutils is new enough to support indirect functions, # #336792. This funky sed supports gold and bfd linkers. local bver nver diff --git a/sys-libs/glibc/glibc-9999.ebuild b/sys-libs/glibc/glibc-9999.ebuild index ef9ad2c0051..8430fbb242d 100644 --- a/sys-libs/glibc/glibc-9999.ebuild +++ b/sys-libs/glibc/glibc-9999.ebuild @@ -421,6 +421,11 @@ want__thread() { use_multiarch() { # Allow user to disable runtime arch detection in multilib. use multiarch || return 1 + # multiarch does not work on ppc with cache-block not equal to 128 bytes + # and breaks memset: + # https://sourceware.org/PR26522 + # https://bugs.gentoo.org/737996 + [[ $(tc-arch ${CTARGET}) == ppc ]] && return 1 # Make sure binutils is new enough to support indirect functions, # #336792. This funky sed supports gold and bfd linkers. local bver nver
