[Buildroot] [Bug 7592] New: Buildroot GCC: -lto requires plugin support in ranlib

[Buildroot] [Bug 7592] New: Buildroot GCC: -lto requires plugin support in ranlib

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7592

           Summary: Buildroot GCC: -lto requires plugin support in ranlib
           Product: buildroot
           Version: 2014.08
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: Other
        AssignedTo: unassigned at buildroot.uclibc.org
        ReportedBy: syntheticpp at gmx.net
                CC: buildroot at uclibc.org
   Estimated Hours: 0.0


To circumvent linker errors when lto is enabled I use  
arm-linux-gcc-ranlib and arm-linux-gcc-ar
but arm-linux-gcc-ranlib stops with this error:

sorry - this program has been built without plugin support


Config:

BR2_arm=y
BR2_cortex_a8=y
BR2_ARM_EABIHF=y
BR2_ARM_FPU_VFPV3=y
BR2_DEPRECATED=y
BR2_OPTIMIZE_3=y
BR2_TOOLCHAIN_BUILDROOT_EGLIBC=y
BR2_EGLIBC_VERSION_2_19=y
BR2_BINUTILS_VERSION_2_24=y
BR2_GCC_VERSION_4_9_X=y
BR2_TOOLCHAIN_BUILDROOT_CXX=y

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[Buildroot] [Bug 7592] Buildroot GCC: -lto requires plugin support in ranlib

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7592

--- Comment #1 from Thomas Petazzoni <thomas.petazzoni@free-electrons.com> 2014-11-07 07:28:23 UTC ---
We don't have LTO support right now in Buildroot. There is a patch adding LTO
support (see http://patchwork.ozlabs.org/patch/362034/), but we not entirely
happy with it yet, so it hasn't been applied. Feel free to test it and report
back: some feedback on the patch would be very useful.

So, I'm tempted to classify this bug not as a bug, but as a feature request.

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[Buildroot] [Bug 7592] Buildroot GCC: -lto requires plugin support in ranlib

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7592

--- Comment #2 from syntheticpp at gmx.net 2014-11-09 10:54:30 UTC ---
OK, I build gcc and binutils with

+        --enable-plugins \
+        --enable-lto

rootfs builds fine, but when gcc-ar is called it fails because it is also
called with all the GCC options.

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[Buildroot] [Bug 7592] Buildroot GCC: -lto requires plugin support in ranlib

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7592

--- Comment #3 from syntheticpp at gmx.net 2014-11-09 11:11:20 UTC ---
The problem is that arm-linux-gcc-ar/ranlib are also wrapped by
ext-toolchain-wrapper.
When those tools just link to the external toolchain lto works (without
switching to gold)

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[Buildroot] [Bug 7592] Buildroot GCC: -lto requires plugin support in ranlib

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7592

--- Comment #4 from syntheticpp at gmx.net 2014-11-09 12:14:18 UTC ---
I pushed patches to the list to support lto for buildroot-clients.
buildroot itself is still compiled without lto.

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[Buildroot] [Bug 7592] Buildroot GCC: -lto requires plugin support in ranlib

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7592

--- Comment #5 from syntheticpp at gmx.net 2014-11-24 18:19:25 UTC ---
http://patchwork.ozlabs.org/patch/408558/
http://patchwork.ozlabs.org/patch/411183/

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[Buildroot] [Bug 7592] Buildroot GCC: -lto requires plugin support in ranlib

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7592

--- Comment #6 from syntheticpp at gmx.net 2015-02-12 09:10:10 UTC ---
Why does nobody care about this patch?

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[Buildroot] [Bug 7592] Buildroot GCC: -lto requires plugin support in ranlib

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7592

--- Comment #7 from syntheticpp at gmx.net 2015-02-14 08:11:12 UTC ---
Ah! didn't noticed 
http://thread.gmane.org/gmane.comp.lib.uclibc.buildroot/103000/focus

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[Buildroot] [Bug 7592] Buildroot GCC: -lto requires plugin support in ranlib

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7592

--- Comment #8 from syntheticpp at gmx.net 2015-02-18 10:37:22 UTC ---
Updated patch:
http://thread.gmane.org/gmane.comp.lib.uclibc.buildroot/106748

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[Buildroot] [Bug 7592] Buildroot GCC: -lto requires plugin support in ranlib

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7592

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

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

--- Comment #9 from Thomas Petazzoni <thomas.petazzoni@free-electrons.com> 2015-06-04 15:15:44 UTC ---
This has actually been fixed a long time ago, in commit
814f63ec32585f281855587fe0a287cee32e4232, which adds LTO support. It makes sure
the wrapper is not generated for tools that shouldn't be wrapped.

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