From mboxrd@z Thu Jan 1 00:00:00 1970 From: Markus Mayer Date: Thu, 15 Feb 2018 16:56:06 -0800 Subject: [Buildroot] [RFC 0/6] Support 32-bit binaries on a 64-bit architecture Message-ID: <20180216005612.69593-1-mmayer@broadcom.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net This series contains a proposal for supporting 32-bit libraries and binaries on a 64-bit platform. There are some limitations and prerequisites as to the scope this has been tested. - It has only been tested on ARM/ARM64. - It has only been tested with an external toolchain (https://github.com/Broadcom/stbgcc-6.3/releases). - It requires that the Aarch64 compiler be compiled with "multi-lib" enabled. This ensures that the sysroot doesn't contain a lib64 -> lib symlink. Instead, lib and lib64 are separate directories. - It has only been tested with a fairly limited number of packages. There might be other packages that don't correctly pass --libdir, similar to bzip2 as mentioned below. The patches in this series make the following changes, in this order: - ensure that check-bin-arch allows Aarch32 binaries on Aarch64 - introduce some new BR2 configuration variables (primarily for the 32-bit sysroot location on the host and where system libraries live by default on the target) - tell the Buildroot core not to create lib32 or lib64 symlink when 32-bit support is enabled - tell the Buildroot core to copy the 32-bit sysroot when 32-bit support is enabled - introduce the $(LIBDIR) variable to the bzip2 package, so we can tell it that libbz2.so should go in /usr/lib64 when that is desired - modify the package core to pass /usr/lib (or /usr/lib64) as the library location for the system The result is that all 64-bit shared libraries should be installed into /usr/lib64. The 32-bit libraries are copied from the 32-bit sysroot on the host into /usr/lib. I am quite certain this submission will only be a first step, but it does look like there are others who are faced with the same issue. Markus Mayer (6): support/scripts/check-bin-arch: improve architecture check system/Config.in: add configuration options for 32-bit library support core: system and toolchain: 32-bit run-time support on 64-bit platform core/pkg-toolchain-external: copy external 32-bit libraries to staging bzip2: introduce make variable $(LIBDIR) package: use BR2_ROOTFS_LIB_DIR for all libraries we use package/bzip2/0003-add-libdir-to-makefile.patch | 36 ++++++++++++++++++++++ .../bzip2/0004-add-libdir-to-makefile-libbz2.patch | 31 +++++++++++++++++++ package/bzip2/bzip2.mk | 4 ++- package/dmalloc/dmalloc.mk | 7 +++-- package/e2fsprogs/e2fsprogs.mk | 2 ++ package/libzlib/libzlib.mk | 3 +- package/linux-tools/linux-tool-cpupower.mk.in | 7 ++++- package/pciutils/pciutils.mk | 2 ++ package/pkg-autotools.mk | 1 + package/readline/readline.mk | 2 +- support/scripts/check-bin-arch | 15 +++++++++ system/Config.in | 34 ++++++++++++++++++++ system/system.mk | 11 ++++++- .../toolchain-external/pkg-toolchain-external.mk | 13 +++++++- 15 files changed, 161 insertions(+), 10 deletions(-) create mode 100644 package/bzip2/0003-add-libdir-to-makefile.patch create mode 100644 package/bzip2/0004-add-libdir-to-makefile-libbz2.patch -- 2.7.4