[Buildroot] [Bug 7562] New: musl buildroot-toolchain and BR2_MIPS_SOFT_FLOAT break

[Buildroot] [Bug 7562] New: musl buildroot-toolchain and BR2_MIPS_SOFT_FLOAT break

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7562

           Summary: musl buildroot-toolchain and BR2_MIPS_SOFT_FLOAT break
           Product: buildroot
           Version: 2014.08
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
        AssignedTo: unassigned at buildroot.uclibc.org
        ReportedBy: alex+buildroot at digriz.org.uk
                CC: buildroot at uclibc.org
   Estimated Hours: 0.0


I use the following settings:

BR2_mipsel=y
BR2_TOOLCHAIN_BUILDROOT_MUSL=y
BR2_MIPS_SOFT_FLOAT=y

Even trying to run busybox fails as ld-musl-mipsel.so.1 does not exist.  Some
digging around I found that ld-musl-mipsel-sf.so.1 does, I am guessing 'sf'
stands for "soft float".

To workaround the problem, I slipped into my post-build.sh script the
following:
----
ln -f -s /lib/libc.so "$1/lib/ld-musl-mipsel.so.1"
----

That gets things working again.  Not should how this should actually be fixed,
otherwise I would submit a patch.

Let me know if you need anything from me to help get this fixed.

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[Buildroot] [Bug 7562] musl buildroot-toolchain and BR2_MIPS_SOFT_FLOAT break

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7562

--- Comment #1 from Thomas Petazzoni <thomas.petazzoni@free-electrons.com> 2014-11-07 07:37:03 UTC ---
Thanks for the report. That's due to a lack of coherency between the musl
installation code (which indeed installs the ld-musl-mipsel-sf symbolic link)
and the gcc patch we have for musl support, which assumes the mips dynamic
linker is always ld-musl-mipsel, regarding of whether it's hard-float or
soft-float.

I'll have a look into this and if applicable report this up to the folks doing
the gcc patches for musl.

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[Buildroot] [Bug 7562] musl buildroot-toolchain and BR2_MIPS_SOFT_FLOAT break

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7562

--- Comment #2 from Thomas Petazzoni <thomas.petazzoni@free-electrons.com> 2014-11-09 10:33:56 UTC ---
Issue reported upstream at
https://bitbucket.org/GregorR/musl-cross/issue/4/invalid-mips-soft-float-linker-path.
I am not entirely sure what is the proper condition to add in gcc to determine
if the -sf suffix should be added or not. I'll wait for upstream to give a hint
about this before cooking a patch.

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[Buildroot] [Bug 7562] musl buildroot-toolchain and BR2_MIPS_SOFT_FLOAT break

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7562

Thomas Petazzoni <thomas.petazzoni@free-electrons.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at buildroot.uclibc |thomas.petazzoni at free-elect
                   |.org                        |rons.com

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[Buildroot] [Bug 7562] musl buildroot-toolchain and BR2_MIPS_SOFT_FLOAT break

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7562

Peter Korsgaard <jacmet@uclibc.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #3 from Peter Korsgaard <jacmet@uclibc.org> ---
Fixed in git by:

commit 348d5edd91abec1fc4cc27965220d54e58217dc3
Author: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Date:   Tue Mar 8 22:20:55 2016 +0100

    gcc: fix dynamic linker path for mips soft-float

    This commit updates the gcc musl patches for gcc 4.7, 4.8 and 4.9 so
    that the path to the dynamic linker encoded as "program interpreter"
    in the generated binaries actually matches the symbolic link installed
    by musl when building for mips soft-float.

    Indeed, musl installs a symlink called ld-musl-mipsel-sf.so.1, but gcc
    currently generates binaries that use /lib/ld-musl-mips.so as program
    interpreter.

    The fix is simply the one from
    https://bitbucket.org/GregorR/musl-cross/commits/825219202365, i.e
    adjust MUSL_DYNAMIC_LINKER in our musl gcc patches.

    Thanks to these patches:

    $ ./host/usr/bin/mipsel-linux-readelf -a ./target/bin/busybox
    [...]
          [Requesting program interpreter: /lib/ld-musl-mipsel-sf.so.1]
    [...]

    gcc 5.x doesn't need any fix because the musl patches already use the
    right value.

    Fixes bug #7562.

    Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
    Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

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