[Buildroot] [Bug 10786] New: Linux fails to build unless make linux-menuconfig is run first

[Buildroot] [Bug 10786] New: Linux fails to build unless make linux-menuconfig is run first

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=10786

            Bug ID: 10786
           Summary: Linux fails to build unless make linux-menuconfig is
                    run first
           Product: buildroot
           Version: 2017.08
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at buildroot.uclibc.org
          Reporter: adyke at harris.com
                CC: buildroot at uclibc.org
  Target Milestone: ---

Created attachment 7476
  --> https://bugs.busybox.net/attachment.cgi?id=7476&action=edit
defconfig

When selecting BR2_TARGET_ROOTFS_ISO9660 and BR2_TARGET_SYSLINUX_ISOLINUX,
Linux fails to build until "make linux-menuconfig" is run. It would seem that
the kernel is expecting output/images/rootfs.cpio to exist, but it does not
unless linux-menuconfig is run.

Once linux-menuconfig has been run once, the problem disappears until I rm -rf
everything in output/images. Then running linux-menuconfig again solves the
issue. 

Obviously the workaround is to run linux-menuconfig, but trying to build in a
freshly checked out copy of our repo always fails.


A branch of our repo that is identical except it does not have
BR2_TARGET_ROOTFS_ISO9660 and BR2_TARGET_SYSLINUX_ISOLINUX set does not see
this issue.

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[Buildroot] [Bug 10786] Linux fails to build unless make linux-menuconfig is run first

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=10786

--- Comment #1 from adyke at harris.com ---
Created attachment 7481
  --> https://bugs.busybox.net/attachment.cgi?id=7481&action=edit
linux_defconfig

linux_defconfig used when bug was discovered

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[Buildroot] [Bug 10786] Linux fails to build unless make linux-menuconfig is run first

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=10786

--- Comment #2 from Thomas Petazzoni <thomas.petazzoni@free-electrons.com> ---
I'm indeed able to reproduce, I'll try to have a look. Thanks for the bug
report.

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[Buildroot] [Bug 10786] Linux fails to build unless make linux-menuconfig is run first

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=10786

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

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

--- Comment #3 from Thomas Petazzoni <thomas.petazzoni@free-electrons.com> ---
You have CONFIG_INITRAMFS_SOURCE defined in your linux_defconfig, but you have
not enabled initramfs support in Buildroot. So obviously this cannot work.

If you enable initramfs support in Buildroot, then Buildroot will make sure to
have a dummy rootfs.cpio when the kernel is first built, will make sure to set
CONFIG_INITRAMFS_SOURCE to the correct value, and will rebuild the kernel image
at the end of the build with the final rootfs.cpio.

Therefore, there is no bug per se: there is just a mis-use of the initramfs
support.

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