commit: 8cf656db6d13ce7e97966bb31c0a068731f8530e Author: Sergei Trofimovich <slyfox <AT> gentoo <DOT> org> AuthorDate: Sun Aug 23 11:32:05 2020 +0000 Commit: Sergei Trofimovich <slyfox <AT> gentoo <DOT> org> CommitDate: Sun Aug 23 11:33:01 2020 +0000 URL: https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=8cf656db
sys-libs/glibc: disable submachine detection on ppc32 By default glibc does not enable multiarch on powerpc-unknown-linux-gnu targets. Bug triggers only when CFLAGS value 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 submachine detection for ppc32 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 | 8 ++++++++ sys-libs/glibc/glibc-2.32.ebuild | 8 ++++++++ sys-libs/glibc/glibc-9999.ebuild | 8 ++++++++ 3 files changed, 24 insertions(+) diff --git a/sys-libs/glibc/glibc-2.31-r6.ebuild b/sys-libs/glibc/glibc-2.31-r6.ebuild index c010b578953..3ac5fb0e9b1 100644 --- a/sys-libs/glibc/glibc-2.31-r6.ebuild +++ b/sys-libs/glibc/glibc-2.31-r6.ebuild @@ -301,6 +301,14 @@ setup_target_flags() { # The mips abi cannot support the GNU style hashes. #233233 filter-ldflags -Wl,--hash-style=gnu -Wl,--hash-style=both ;; + ppc) + # Many arch-specific implementations do not work on ppc with + # cache-block not equal to 128 bytes. This breaks memset: + # https://sourceware.org/PR26522 + # https://bugs.gentoo.org/737996 + # Use default -mcpu=. For ppc it means non-multiarch setup. + filter-flags '-mcpu=*' + ;; sparc) # Both sparc and sparc64 can use -fcall-used-g6. -g7 is bad, though. filter-flags "-fcall-used-g7" diff --git a/sys-libs/glibc/glibc-2.32.ebuild b/sys-libs/glibc/glibc-2.32.ebuild index 2a750041ae4..062f5445621 100644 --- a/sys-libs/glibc/glibc-2.32.ebuild +++ b/sys-libs/glibc/glibc-2.32.ebuild @@ -301,6 +301,14 @@ setup_target_flags() { # The mips abi cannot support the GNU style hashes. #233233 filter-ldflags -Wl,--hash-style=gnu -Wl,--hash-style=both ;; + ppc) + # Many arch-specific implementations do not work on ppc with + # cache-block not equal to 128 bytes. This breaks memset: + # https://sourceware.org/PR26522 + # https://bugs.gentoo.org/737996 + # Use default -mcpu=. For ppc it means non-multiarch setup. + filter-flags '-mcpu=*' + ;; sparc) # Both sparc and sparc64 can use -fcall-used-g6. -g7 is bad, though. filter-flags "-fcall-used-g7" diff --git a/sys-libs/glibc/glibc-9999.ebuild b/sys-libs/glibc/glibc-9999.ebuild index ef9ad2c0051..67b4c124000 100644 --- a/sys-libs/glibc/glibc-9999.ebuild +++ b/sys-libs/glibc/glibc-9999.ebuild @@ -302,6 +302,14 @@ setup_target_flags() { # The mips abi cannot support the GNU style hashes. #233233 filter-ldflags -Wl,--hash-style=gnu -Wl,--hash-style=both ;; + ppc) + # Many arch-specific implementations do not work on ppc with + # cache-block not equal to 128 bytes. This breaks memset: + # https://sourceware.org/PR26522 + # https://bugs.gentoo.org/737996 + # Use default -mcpu=. For ppc it means non-multiarch setup. + filter-flags '-mcpu=*' + ;; sparc) # Both sparc and sparc64 can use -fcall-used-g6. -g7 is bad, though. filter-flags "-fcall-used-g7"
