As gcc needed glibc version 2.29, I started emerging glibc
It said invalid: REDEPEND: USE flag 'kernel_linux' referenced in conditional 'kernel_linux?' is not in use
So, I added kernel_linux under IUSE_IMPLICIT variable to /etc/portage/make.profile/make.defaults
Similarly as above, Missing USE flag 'amd64' So, added amd64 use flag under IUSE_IMPLICIT variable to /etc/portage/make.profile/make.defaults
IUSE_IMPLICIT="abi_x86_64 prefix prefix-guest kernel_linux amd64"
Then, it complained about saying Your /etc/nsswitch.conf is out of date. So, I had to update it. My nsswitch.conf
As glibc needed sys-devel/bison, I commented it from make.provided and emerged
sudo emerge -a sys-devel/bison
Also Installed linux-headers as glibc’s dependencies
sudo emerge -a sys-kernel/linux-headers
I had to add sys-devel/gcc to package.provided (as it was dependencies for glibc). Continued with emerging, ERROR : in function iconv_open': (.text+0x55a): undefined reference to __stack_chk_guard'
Referring to one of stackoverflow post, I added -fno-stack-protector to CFLAGS in make.conf and used -ssp during emerging.
Then, Segmentation fault (core dumped) LC_ALL=C ./ld-*.so --library-path . ${x} > /dev/null
When i asked about this in the IRC channel, they said that I managed to build a glibc that doesn’t work and it failed in sanity check. Also, they commented on __stack_chk_guard error saying that it was dangerous to add -fno-stack-protector flag and it also tends to breaks things
I thought, instead of adding use flags manually(caused a lot of problems), I would change the profile to default/linux/amd64/17.1/desktop and add gcc, glibc to packages.provided which overcame the problem of circular dependencies.
But, again falls on world update due to circular dependencies of perl package. So, I decided to build binaries for perl.
I read about crossdev again and started building toolchain for crOS.
- This would build the glibc greater than v2.29 and perl binaries also
In order to build toolchain for x86_64-cros-linux-gnu, I needed a custom repository which i had setup previously and also updated my system. I built the toolchain for crOS and tested by building busy box package with static keyword.
sudo crossdev -t x86_64-cros-linux-gnu
sudo USE=static x86_64-cros-linux-gnu-emerge -av1 busybox
Then, I built gcc-9.3 for crOS (Was not to cross compile gcc-10.1.0-r1)
sudo x86_64-cros-linux-gnu-emerge -av1 =sys-devel/gcc-9.3.0
Before building perl binaries, I wanted make sure of toolchain. So, I zipped the directory /usr/x86_64-cros-linux-gnu and moved that to crOS.
I symlinked the gcc’s and binutils’s binaries to toolchain’s usr/bin and added to PATH variable. Then, I added toolchain’s usr/lib to LD_LIBRARY_PATH variable. Also, symlinked header files from toolchain’s sys-include to /usr/include. Finally, “Hello world” program successfully executed on crOS
Now, I tried to emerge dev-lang/perl but had to add ncurse to toolchain’s package.use
But got stuck with error
The following REQUIRED_USE flag constraints are unsatisfied:
python_single_target_python2_7 python_single_target_python3_8 python_single_target_python3_8
The above constraints are a subset of the following complete expression:
exactly-one-of ( python_single_target_python2_7 python_single_target_python3_7 python_single_target_python3_8)
While installing python-3.8.3, I had to add PYTHON_TARGETS PYTHON_TARGETS="python3_8” to toolchain’s make.conf and add PYTHON_TARGETS to toolchain’s make.profile/make.default line USE_EXPAND
One of the python dependencies, python-exec failed to install. So, I Added to toolchains’s profile/package.provided (removed after the python installation completed and emerged again)
Also, I had to emerge a unstable package, setup_tools. So, I added it to system’s system’s package.use with ~amd64 use flag
Then, Error Couldn't satisfy ebuild dev-python/certifi. I added it to package.provided as it was firefox’s CA Bundle. Python successfully emerged
After all this, perl package failed to emerge by giving an error that it couldn’t cross-compile perl. I asked on IRC Channel and they asked me to find the right version of perl to emerge which is compatible perl-cross
x86_64-cros-linux-gnu-emerge -av1 =dev-lang/perl-5.30.1
Finally, I had build all the packages that was stuck in circular dependencies
sys-devel/gcc-9.3.0
sys-libs/glibc-2.30-r8
dev-lang/perl-5.30.3
sys-libs/db-5.3.28-r2
sys-devel/autoconf-2.69-r4
I zipped the directory /usr/x86_64-cros-linux-gnu using, copied to crOS and unzipped it
tar -czf x86_64-cros-linux-gnu.tar /usr/x86_64-cros-linux-gnu # On gentoo system
sudo tar -xzf x86_64-cros-linux-gnu.tar # On crOS root directory
But it failed as it had less space on its root partition i.e 2GB
While I was googling around on how to extend the partition, I found a script called chromeos-resize
I downloaded the script and executed it.
curl https://raw.githubusercontent.com/ethanmad/chromeos-resize/master/cros-resize.sh
sudo chmod 755 cros-resize.sh
sudo ./cros-resize.sh
Script failed as it needed developer mode to be enabled. As i don’t own a chromebook, I couldn’t. So commented those lines and re-ran it again.
I followed as it instructed me. After it was done, it rebooted and repaired itself. I was supposed to run it again with the same values.
It successfully completed but the when i executed df -h, it was of same size. I rechecked with fdisk -l and it extended to rootfs C which was minimal-size partition for future third kernel.
I went through the script and learnt how to extend a crOS partition
- As crOS repaired itself, it wipes out all the data on the device
According to phyical partition of crOS (Layout), I took 6gb from state partition and added to rootfs A. It is easier as they are beside each other
Live boot a OS, list the partition and extend it
cgpt show /dev/sda
cgpt add -i 1 -b <startblock> -s <size> /dev/sda # Moved the starting point by 6gb and reduced that 6gb from size also
cgpt add -i 3 -b <startblock> -s <size> /dev/sda # kept starting point same but added + 6gb for size
Then, check consistency and resize the file system
e2fsck -f /dev/sda3
resize2fs /dev/sda3
Reboot and repeat the above 2 steps again
Finally, I was able to extend the root partition to 8GB
Summary
As gcc needed glibc version 2.29, I started emerging it with its dependencies and also by adding required use flags. But it built a glibc that doesn’t work and failed sanity checks. So, I changed the profile to default/linux/amd64/17.1/desktop and added gcc, glibc to packages.provided which overcame the problem of circular dependencies.
Then, It needed perl package, So I had to cross compile it using crossdev. At last, I zipped the toolchain directory, copied to crOS and unzipped it. But it failed as it had less space on its root partition. I referred a script called chromeos-resize.sh and learnt things that was required. It successfully extended the root partition.