Re: Directory structure of glibc and header files installed on Linux

[Peng Yu <pengyu.ut@gmail.com>]

> A sysroot is a folder which contains a minimal filesystem (especially
> libraries, the C library and header files). I just paste the *exactly*
> sequence of command using build-many-glibcs.py to create one using
> gcc targeting glibc. You will need to read build-many-glibcs.py [3]
> to check exactly on how it accomplish it,

I am referring to the exact sequence of commands to make sysroot.
Basically, all commands need for vanilla ubuntu are needed (only
sysroot is need before running build-many-glibcs.py ?). Google search
of sysroot is not very helpful on how to use it.

https://stackoverflow.com/questions/39920712/what-is-a-sysroot-exactly-and-how-do-i-create-one

So once sysroot is create, then the following commands can be used?
All the original glibc installed in the system will not be affected?

>>> (1) glibc-git$ ./scripts/build-many-glibcs.py checkout
>>> /path/to/place/source/and/binaries
>>> (2) glibc-git$ ./scripts/build-many-glibcs.py host-libraries
>>> (3) glibc-git$ ./scripts/build-many-glibcs.py compilers x86_64-linux-gnu
>>> (4) glibc-git$ ./scripts/build-many-glibcs.py glibcs x86_64-linux-gnu
>>>
>>> The (1) will download the required source (binutils, linux, gcc,
>>> glibc, math libraries), (2) will
>>> build the math libraries used in gcc built, (3) will build a bootstrap
>>> compiler targetting
>>> x86_64-linux-gnu, and finally (4) will build a glibc using the
>>> bootstrap compiler built.
>>
>>
>
> [1] https://crosstool-ng.github.io/docs/toolchain-construction/

I don't need cross compilation. Why is this relevant?

> [2] http://www.linuxfromscratch.org/

What is the relation of the above instruction to arch linux?

> [3]
> https://sourceware.org/git/?p=glibc.git;a=blob;f=scripts/build-many-glibcs.py;h=580d25e8ee4b3ff5f99fb957e6e533035bcc4ebc;hb=HEAD

There are almost two thousand lines of code with too much code about
dealing with command-line options. It is definitely not minimal for
learning purposes. Does it really take so many lines of code. If the
target is just for intel architecture, It sounds like a bash script
with barely minimal code should be much shorter.

-- 
Regards,
Peng