[Buildroot] [RFC 0/6] Support 32-bit binaries on a 64-bit architecture
Baruch Siach
baruch at tkos.co.il
Fri Feb 16 06:45:57 UTC 2018
Hi Markus,
On Thu, Feb 15, 2018 at 04:56:06PM -0800, Markus Mayer wrote:
> 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.
There is one thing I am missing here. AFAICS, this series does not add support
for building 32-bit libraries in addition to their 64-bit versions. So the
32-bit binaries that are to run on target must have their dependencies
satisfied from the toolchain provided libraries. Is that correct?
baruch
> 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
--
http://baruch.siach.name/blog/ ~. .~ Tk Open Systems
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