36 KiB
0 bootstrap-seeds
This is where it all begins. We start with the two raw binary seeds hex0-seed and kaem-optional-seed.
First, we use those seeds to rebuild themselves.
Note that all early steps before mes are part of stage0-posix.
1 hex0
hex0 is fairly trivial to implement and for each pair of hexadecimals characters it outputs a byte. We have also added two types of line comments (# and ;) to create a well commented lines like:
# :loop_options [_start + 0x6F] 39D3 ; cmp_ebx,edx # Check if we are done 74 14 ; je !loop_options_done # We are done 83EB 02 ; sub_ebx, !2 # --options
In the first steps we use initial hex0 binary seed to rebuild kaem-optional and hex0 from their source.
hex0 code is somewhat tedious to read and write as it is basically a well documented machine code. We have to manually calculate all jumps in the code.
hex0 can be approximated with: sed 's/[;#].*$//g' $input_file | xxd -r -p > $output_file
2 kaem-optional
kaem-optional is a trivial shell that can read list of commands together with their command line arguments from a file and executes them. It also supports line comments but has no other features.
3 hex1
This is the last program that has to be written in hex0 language. hex1 is a simple extension of hex0 and adds a single character labels and allows calculating 32-bit offsets from current position in the code to the label. hex1 code might look like:
:a #:loop_options 39D3 ; cmp_ebx,edx # Check if we are done 0F84 %b ; je %loop_options_done # We are done 83EB 02 ; sub_rbx, !2 # --options
4 hex2
hex2 is our final hex language that adds support for labels of arbitrary length. It also allows accessing them via 8, 16, 32-bit relative addresses (!, @, %) and via 16-bit or 32-bit ($, &) absolute addresses:
:loop_options 39D3 ; cmp_ebx,edx # Check if we are done 74 !loop_options_done ; je8 !loop_options_done # We are done 83EB 02 ; sub_ebx, !2 # --options
5 catm
catm allows concatenating files with catm output_file input1 input2 ... inputN. This allows us to distribute common code in separate files. We will first use it to append ELF header to .hex2 files. Before this step the ELF header had to be included in the source file itself.
6 M0
The M0 assembly language is the simplest assembly language you can create that enables the creation of more complicated programs. It includes only a single keyword: DEFINE and leverages the language properties of hex2 along with extending the behavior to populate immediate values of various sizes and formats.
Thus M0 code looks like:
DEFINE cmp_ebx,edx 39D3 DEFINE je 0F84 DEFINE sub_ebx, 81EB :loop_options cmp_ebx,edx # Check if we are done je %loop_options_done # We are done sub_ebx, %2 # --options
7 cc_x86
The cc_x86 implements a subset of the C language designed in M0 assembly. It is a somewhat limited subset of C but complete enough to make it easy to write a more usable C compiler written in the C subset that cc_x86 supports.
At this stage we start using M2libc as our C library. In fact, M2libc ships two versions of C library. There is a single-file library that contains just enough to build M2-Planet and there is a full version that is rather well-featured.
8 M2-Planet
This is the only C program that we build with cc_x86. M2-Planet supports a larger subset of C than cc_x86 and we are somewhat closer to C89 (it does not implement all C89 features but on the other hand it does have some C99 features). M2-Planet also includes a very basic preprocessor, so we can use stuff like #define, #ifdef.
M2-Planet is also capable of using full M2libc C library that has more features and optimizations compared to bootstrap version of M2libc.
M2-Planet supports generating code for various architectures including x86, amd64, armv7, aarch64, riscv32 and riscv64. Up until this point bootstrap has been very architecture specific. From now on we still have platform specific bits of code but they are usually handled as conditionals in the same application rather than having completely different applications.
9 mescc-tools
Now we build blood-elf used to generate debug info, C version of hex2 (also called hex2) and C version of M0 called M1. These are more capable than their platform specific hex counterparts and are fully cross-platform. Thus we can now have the whole toolchain written in C.
Then we rebuild mescc-tools again, so all our tools are using new toolchain written in C.
Finally, we build kaem which is a more capable version of kaem-optional and adds support for variables, environmental variables, conditionals and aliases. It also has various built-ins such as cd and echo.
10 M2-Mesoplanet
M2-Mesoplanet is a preprocessor that is more capable than M2-Planet and supports #include statements. It can also launch compiler, assembler and linker with the correct arguments, so we don't need to invoke them manually.
At the moment it is only used to build mescc-tools-extra.
11 M2-Planet
We rebuild M2-Planet with M2-Planet.
From here, we can move on from the lowest level stuff.
12 mescc-tools-extra
mescc-tools-extra contains some additional programs, namely filesystem utilities cp and chown. This allows us to have one unified directory for our binaries. Futhermore, we also build sha256sum, a checksumming tool, that we use to ensure reproducibility and authenticity of generated binaries. We also build initial untar, ungz and unbz2 utilities to deal with compressed archives.
13 /sysa
We now move into the /sysa directory. As stage0-posix has no concept of chdir() (not added until very late in stage0-posix), we have to copy a lot of files into the root of the initramfs, making it very messy. We get into the move ordered directory /sysa here, copying over all of the required binaries from /.
14 mes 0.24
GNU mes is a scheme interpreter. It runs the sister project mescc, which is a C compiler written in scheme, which links against the Mes C Library. All 3 are included in this same repository. There are two stages to this part:
- Compiling an initial mes using M2-Planet. Note that this is only the Mes interpreter, not the libc or anything else.
- We then use this to recompile the Mes interpreter as well as building the libc. This second interpreter is faster and less buggy.
15 tinycc 0.9.26
tinycc is a minimal C compiler that aims to be small and fast. It complies with all C89 and most of C99 standards.
First, we compile janneke’s fork of tcc 0.9.26 using mescc, containing 27 patches to make it operate well in the bootstrap environment and make it compilable using mescc. This is a non-trivial process and as seen within tcc.kaem has many different parts within it: a. tcc 0.9.26 is first compiled using mescc. b. The mes libc is recompiled using tcc (mescc has a non-standard .a format), including some additions for later programs. c. tcc 0.9.26 is recompiled 5(!) times to add new features that are required for other features, namely long long and float. Each time, the libc is also recompiled.
16 tinycc 0.9.27
Now, we compile upstream tcc 0.9.27, the latest release of tinycc, using the final version of tcc 0.9.26.
From this point onwards, until further notice, all programs are compiled using tinycc 0.9.27.
Note that now we begin to delve into the realm of old GNU software, using older versions compilable by tinycc. Prior to this point, all tools have been adapted significantly for the bootstrap; now, we will be using old tooling instead.
17 make 3.82
GNU make is now built so we have a more robust building system. make allows us to do things like define rules for files rather than writing complex kaem scripts.
18 gzip 1.2.4
gzip is the most common compression format used for software source code. It is more capble than ungz from stage0-posix and also supports compression.
19 tar 1.12
We build GNU Tar 1.12, the last version compilable with mes libc.
20 sed 4.0.9
You are most likely aware of GNU sed, a line editor.
21 patch 2.5.9
patch is a very useful tool at this stage, allowing us to make significantly more complex edits, including just changes to lines.
22 bzip2 1.0.8
bzip2 is a compression format that compresses more than gzip. It is preferred where we can use it, and makes source code sizes smaller.
23 coreutils 5.0
GNU Coreutils is a collection of widely used utilities such as cat, chmod, chown, cp, install, ln, ls, mkdir, mknod, mv, rm, rmdir, tee, test, true, and many others.
A few of the utilities cannot be easily compiled with Mes C library, so we skip them.
The cp in this stage replaces the mescc-tools-extra cp.
24 heirloom devtools
lex and yacc from the Heirloom project. The Heirloom project is a collection of standard UNIX utilities derived from code by Caldera and Sun. Differently from the analogous utilities from the GNU project, they can be compiled with a simple Makefile.
25 bash 2.05b
GNU bash is the most well known shell and the most complex piece of software so far. However, it comes with a number of great benefits over kaem, including proper POSIX sh support, globbing, etc.
Bash ships with a bison pre-generated file here which we delete. Unfortunately, we have not bootstrapped bison but fortunately for us, heirloom yacc is able to cope here.
26 flex 2.5.11
flex is a tool for generating lexers or scanners: programs that recognize lexical patters.
Unfortunately flex also depends on itself for compiling its own scanner, so first flex 2.5.11 is compiled, with its scanner definition manually modified so that it can be processed by lex from the Heirloom project (the required modifications are mostly syntactical, plus a few workarounds to avoid some flex advanced features).
27 tcc 0.9.27 (patched)
We recompile tcc with some patches needed to build musl.
28 musl 1.1.24
musl is a C standard library that is lightweight, fast, simple, free, and strives to be correct in the sense of standards-conformance and safety. musl is used by some distributions of GNU/Linux as their C library. Our previous Mes C library was incomplete which prevented us from building many newer or more complex programs.
tcc has slight problems when building and linking musl, so we apply a few patches. In particular, we replace all weak symbols with strong symbols and will patch tcc in the next step to ignore duplicate symbols.
29 tcc 0.9.27 (musl)
We recompile tcc against musl. This is a two stage process. First we build tcc-0.9.27 using tcc-0.9.26 that itself links to Mes C library but produces binaries linked to musl. Then we recompile newly produced tcc with itself. Interestingly, tcc-0.9.27 linked against musl is self hosting.
30 musl 1.1.24 (tcc-musl)
We now rebuild musl with the just built tcc-musl, which fixes a number of bugs, particularly regarding floats, in the first musl.
31 tcc 0.9.27 (musl v2)
Now that we have a ‘fixed’ musl, we now recompile tcc as tcc uses floats extensively.
32 sed 4.0.9
sed is rebuilt against musl.
33 bzip2 1.0.8
bzip2 is rebuilt unpatched with the new tcc and musl fixing issues with reading files from stdin that existed in the previous build.
34 m4 1.4.7
m4 is the first piece of software we need in the autotools suite, flex 2.6.4 and bison. It allows macros to be defined and files to be generated from those macros.
35 flex 2.6.4
We recompile unpatched GNU flex using older flex 2.5.11. This is again a two stage process, first compiling flex using scan.c (from scan.l) created by old flex, then recompile scan.c using the new version of flex to remove any buggy artifacts from the old flex.
36 bison 3.4.1
GNU bison is a parser generator. With m4 and flex we can now bootstrap it following https://gitlab.com/giomasce/bison-bootstrap. It’s a 3 stage process:
- Build bison using a handwritten grammar parser in C.
- Use bison from previous stage on a simplified bison grammar file.
- Build bison using original grammar file.
Finally we have a fully functional bison executable.
37 grep 2.4
GNU grep is a pattern matching utility. Is is not immediately needed but will be useful later for autotools.
38 diffutils 2.7
diffutils is useful for comparing two files. It is not immediately needed but is required later for autotools.
39 coreutils 5.0
coreutils is rebuilt against musl. Additional utilities are built including comm, expr, dd, sort, sync, uname and uniq. This fixes a variety of issues with existing coreutils.
40 coreutils 6.10
We build date, mktemp and sha256sum from coreutils 6.10 which are either missing or don't build correctly in 5.0. Other utils are not built at this stage.
41 gawk 3.0.4
gawk is the GNU implementation of awk, yet another pattern matching and data extraction utility. It is also required for autotools.
42 perl 5.000
Perl is a general purpose programming language that is especially suitable for text processing. It is essential for autotools build system because automake and some other tools are written in Perl.
Perl itself is written in C but ships with some pre-generated files that need perl for processing, namely embed.h and keywords.h. To bootstrap Perl we will start with the oldest Perl 5 version which has the fewest number of pregenerated files. We reimplement two remaining perl scripts in awk and use our custom makefile instead of Perl’s pre-generated Configure script.
At this first step we build miniperl which is perl without support for loading modules.
43 perl 5.003
We now use perl from the previous stage to recreate pre-generated files that are shipped in perl 5.003. But for now we still need to use handwritten makefile instead of ./Configure script.
44 perl 5.004_05
Yet another version of perl; the last version buildable with 5.003.
45 perl 5.005_03
More perl! This is the last version buildable with 5.004. It also introduces the new pregenerated files regnodes.h and byterun.{h,c}.
46 perl 5.6.2
Even more perl. 5.6.2 is the last version buildable with 5.005.
47 autoconf 2.52
GNU Autoconf is a tool for producing configure scripts for building, installing and packaging software on computer systems where a Bourne shell is available.
At this stage we still do not have a working autotools system, so we manually install autoconf script and replace a few placeholder variables with sed.
Autoconf 2.52 is the newest version of autoconf that does not need perl, and hence a bit easier to install.
48 automake 1.6.3
GNU Automake is a tool for automatically generating Makefile.in files. It is another major part of GNU Autotools build system and consists of aclocal and automake scripts.
We bootstrap it using a 3 stage process:
- Use sed to replace a few placeholder variables in aclocal.in script. Then we manually install aclocal script and its dependencies.
- Patch configure.in to create automake file but skip Makefile.in processing. Again we manually install automake script and its dependencies.
- We now use aclocal, autoconf, and automake to do a proper build and install.
49 automake 1.4-p6
This is an older version of GNU Automake. Various versions of GNU Autotools are not fully compatible, and we will need older automake to build some older software.
50 autoconf 2.52
We now properly rebuild autoconf using automake-1.4 and manually installed autoconf.
51 autoconf 2.13
An older autoconf will be necessary to build GNU Binutils.
52 autoconf 2.12
Yet another old autoconf version that we will need for some parts of GNU Binutils.
53 libtool 1.4
GNU Libtool is the final part of GNU Autotools. It is a script used to hide away differences when compiling shared libraries on different platforms.
54 binutils 2.14
The GNU Binary Utilities, or binutils, are a set of programming tools for creating and managing binary programs, object files, libraries, profile data, and assembly source code.
In particular we can now use full featured ar instead of tcc -ar, the GNU linker ld, which allows us building shared libraries, and the GNU assembler as.
55 musl 1.1.24 (v3)
We rebuild musl for the third time. This time we use GNU ar rather than tcc -ar, so we can drop weak symbols patch. Also, we can use GNU as to build assembly source files, so those assembly files that tcc failed to compile no longer have to be patched.
56 tcc 0.9.27 (musl v3)
We rebuild tcc against new musl and without a patch to ignore duplicate symbols.
57 autoconf 2.53
We now start bootstrapping newer versions of autoconf. Version 2.53 now uses perl. In order to build it with autoconf-2.52 we have to patch it a bit.
58 automake 1.7
Automake 1.7 and Autoconf 2.54 depend on each other, so we patch out two offending autoconf macros to make it build with autoconf-2.53.
59 autoconf 2.54
More autoconf.
60 autoconf 2.55
Even newer autoconf. This is the last version of autoconf that is buildable with automake-1.7.
61 automake 1.7.8
Newer automake. This is the latest automake that is buildable with autoconf-2.55.
62 autoconf 2.57
Newer autoconf. This time we were able to skip version 2.56.
63 autoconf 2.59
Again, we managed to skip one version.
64 automake 1.8.5
We need newer automake to proceed to newer autoconf versions. This is the latest automake version from 1.8 release series.
65 help2man 1.36.4
help2man automatically generates manpages from programs --help and --version outputs. This is not strictly required for bootstrapping but will help us to avoid patching build process to skip generation of manpages. This is the newest version of help2man that does not require Perl 5.8.
66 autoconf 2.61
Yet another version of autoconf.
67 automake 1.9.6
Latest GNU Automake from 1.9 series. Slightly annoyingly depends itself but it is easy to patch to make it buildable with 1.8.5.
68 findutils 4.2.33
GNU Find Utilities can be used to search for files. We are mainly interested in find and xargs that are often used in scripts.
69 libtool 2.2.4
Newer version of libtool which is more compatible with modern Autotools.
70 automake 1.10.3
GNU Automake from 1.10 series. aclocal is slightly patched to work with our perl.
71 autoconf 2.64
Slightly newer version of GNU Autoconf. At this stage Autoconf is mostly backwards compatible but newer versions need newer automake.
72 gcc 4.0.4
The GNU Compiler Collection (GCC) is an optimizing compiler produced by the GNU Project. GCC is a key component of the GNU toolchain and the standard compiler for most projects related to GNU and the Linux kernel.
Only the C frontend is built at this stage.
At this stage we are not yet able to regenerate top-level Makefile.in which needs GNU Autogen and hence Guile. Luckily, building GCC without top-level Makefile is fairly easy.
73 musl 1.2.2
GCC can build the latest as of the time of writing musl version.
We also don't need any of the TCC patches that we used before.
74 gcc 4.0.4
Rebuild GCC with GCC and also against the latest musl.
75 util-linux 2.19.1
util-linux contains a number of general system administration utilities. Most pressingly, we need these for being able to mount disks (for non-chroot mode, but it is built it in chroot mode anyway because it will likely be useful later). The latest version is not used because of autotools/GCC incompatibilities.
76 kbd-1.15
kbd contains loadkeys which is required for building the Linux kernel. The 2.x series is not used because it requires particular features of autotools that we do not have available.
77 make 3.82
GNU make is now rebuilt properly using the build system and GCC, which means that it does not randomly segfault while building the Linux kernel.
78 kexec-tools 2.0.22
kexec is a utility for the Linux kernel that allows the re-execution of the Linux kernel without a manual restart from within a running system. It is a kind of soft-restart. It is only built for non-chroot mode, as we only use it in non-chroot mode. It is used to go into sysb/sysc.
79 create_sysb
The next step is not a package, but the creation of the sysb rootfs, containing all of the scripts for sysb (which merely move to sysc). Again, this is only done in non-chroot mode, because sysb does not exist in chroot mode.
80 Linux kernel 4.9.10
A lot going on here. This is the first (and currently only) time the Linux kernel is built. Firstly, Linux kernel version 4.9.x is used because newer versions require much more stringent requirements on the make, GCC, binutils versions. However, the docs are also wrong, as the latest of the 4.9.x series does not work with our version of binutils. However, a much earlier 4.9.10 does (selected arbitarily, could go newer but did not test), with a small amount of patching. This is also modern enough for most hardware and to cause few problems with software built in sysc. Secondly, the linux-libre scripts are used to deblob the kernel. Every other pregenerated file is appended with _shipped so we use a find command to remove those, which are automatically regenerated. The kernel config was originally taken from Void Linux, and was then modified for the requirements of live-bootstrap, including compiler features, drivers, and removing modules. Modules are unused. They are difficult to transfer to subsequent systems, and we do not have modprobe. Lastly, the initramfs of sysb is generated in this stage, using gen_init_cpio within the Linux kernel tree. This avoids the compilation of cpio as well.
81 go_sysb
This is the last step of sysa, run for non-chroot mode. It uses kexec to load the new Linux kernel into RAM and execute it, moving into sysb.
In chroot, sysb is skipped, and data is transferred directly to sysc and chrooted into.
82 sysb
sysb is purely a transition to sysc, allowing binaries from sysa to get onto a disk (as sysa does not necessarily have hard disk support in the kernel). It populates device nodes, mounts sysc, copies over data, and executes sysc.
83 bash 5.1
Up to this point, our build of bash could run scripts but could not be used interactively. This new version of bash compiles without any patches, provides new features, and is built with GNU readline support so it can be used as an interactive shell. autoconf-2.61 is used to regenerate the configure script and bison is used to recreate some included generated files.
84 xz 5.0.5
XZ Utils is a set of free software command-line lossless data compressors, including lzma and xz. In most cases, xz achieves higher compression rates than alternatives like gzip and bzip2.
85 automake 1.11.2
GNU Automake from 1.11 series. This is not the latest point release as newer ones need Autoconf 2.68.
86 libtool 2.4.7
A modern version of libtool with better compatiblitiy with newer versions of GNU Autotools.
87 autoconf 2.69
This is a much newer version of GNU Autoconf.
88 automake 1.15.1
GNU Automake from 1.15 series. This is the last version that runs on Perl 5.6.
89 tar 1.34
Newer tar has better support for decompressing .tar.bz2 and .tar.xz archives. It also deals better with modern tar archives with extra metadata.
90 coreutils 8.32
We build the latest available coreutils 8.32 which adds needed options to make results of build metadata reproducible. For example, timestamps are changed with touch --no-dereference.
91 pkg-config 0.29.2
pkg-config is a helper tool that helps to insert compile and link time flags.
92 make 4.2.1
A newer version of make built using autotools is much more reliable and is compiled using a modern C compiler and C library. This removes a couple of segfaults encountered later in the process and allows more modern make features to be used. We do not go for the latest because of the use of automake 1.16 which we do not have yet.
93 gmp 6.2.1
GNU Multiple Precision Arithmetic Library (GMP) is a free library for arbitrary-precision arithmetic, operating on signed integers, rational numbers, and floating-point numbers.
GMP is required by newer versions of GCC and Guile.
94 autoconf-archive 2021.02.19
The GNU Autoconf Archive is a collection of Autoconf macros that are used by various projects and in particular GNU MPFR.
95 mpfr 4.1.0
The GNU Multiple Precision Floating-Point Reliable Library (GNU MPFR) is a library for arbitrary-precision binary floating-point computation with correct rounding, based on GNU Multi-Precision Library.
96 mpc 3.2.1
GNU MPC is a library for multiprecision complex arithmetic with exact rounding based on GNU MPFR.
97 flex 2.5.33
An older version of flex is required for bison 2.3. We cannot use 2.5.11 that was compiled much earlier, as it does not produce reproducible output when building bison 2.3.
98 bison 2.3
This is an older version of bison required for the bison files in perl 5.10.1. We backwards-bootstrap this from 3.4.1, using 3.4.1 to compile the bison files in 2.3. This parser works sufficiently well for perl 5.10.5.
99 bison 3.4.2
Bison 3.4.1 is buggy and segfaults when perl 5.32.1 is built. This is probably because it was built with a hand-written makefile. We do not build the latest bison because perl 5.32.1 requires bison <= 3.4.2.
100 perl 5.10.1
Perl 5.10.1 is an intermediate version used before Perl 5.32. We require this version as it adds a couple of modules into lib/ required to regenerate files in Perl 5.32. We still use the Makefile instead of the metaconfig strategy, as metaconfig history becomes poor more than a few years back.
101 dist 3.5-236
dist is perl's package used for generating Perl's Configure (which is written in Perl itself). We 'compile' (aka generate) metaconfig and manifake only from dist. We do not use dist's build system because it itself uses dist.
102 perl 5.32.1
We finally compile a full version of Perl using Configure. This includes all base extensions required and is the latest version of Perl. We are now basically able to run any Perl application we want.
103 libarchive 3.5.2
libarchive is a C library used to read and write archives.
104 openssl 1.1.1l
OpenSSL is a C library for secure communications/cryptography. We do not strictly use any of the networking functions of this library but it is a hard dependency of XBPS.
105 zlib 1.2.13
zlib is a software library used for data compression and implements an abstraction of DEFLATE algorithm that is also used in gzip.
106 automake 1.16.3
GNU Automake from 1.16 series that required newer Perl.
107 autoconf 2.71
GNU Autoconf 2.71 is even newer version of autoconf. It does not build with miniperl, so we postponed it until full perl was built.
108 patch 2.7.6
Our old patch was built with manual makefile and used mes libc. This is a newer version which we need in order to import gnulib into gettext.
109 gettext 0.21
GNU Gettext is an internationalization and localization system used for writing multilingual programs.
110 texinfo 6.7
Texinfo is a typesetting syntax used for generating documentation. We can now use makeinfo script to convert .texi files into .info documentation format.
111 gcc 4.7.4
GCC 4.7.4 is the last version written in C. This time we build both C and C++ backends. C++ backend has some dependency on gperf which is written in C++. Fortunately, it is easy to patch it out and resulting g++ compiler is capable of building gperf.
112 binutils 2.38
This version of binutils provides a more comprehensive set of programming tools for creating and managing binary programs. It also includes modern versions of the ld linker, the as assembler and the ar program.
113 gperf 3.1
gperf is a perfect hash function generator (hash function is injective).
114 libunistring 0.9.10
Library for manipulating Unicode and C strings according to Unicode standard. This is a dependency of GNU Guile.
115 libffi 3.3
The libffi library provides a portable, high level programming interface to various calling conventions.
116 libatomic_ops 7.6.10
libatomic_ops provides semi-portable access to hardware-provided atomic memory update operations on a number of architectures.
117 boehm-gc 8.0.4
The Boehm-Demers-Weiser conservative garbage collector can be used as a garbage collecting replacement for C malloc or C++ new.
118 guile 3.0.7
GNU Ubiquitous Intelligent Language for Extensions (GNU Guile) is the preferred extension language system for the GNU Project and features an implementation of the programming language Scheme.
We use guile-psyntax-bootstrapping project to bootstrap Guile's psyntax.pp without relying on pre-expanded code.
119 which 2.21
which shows the full path of (shell) commands. It mostly duplicates bash built-in command -v but some scripts call which instead. In particular, autogen scripts use it.
120 grep 3.7
Newer grep will be needed to bootstrap autogen.
121 sed 4.8
Earlier sed was built with manual makefile with most features compiled out. Build a newer sed using GNU Autotools build system. In particular this will let sed keep executable bit on after in place editing.
122 autogen 5.18.16
GNU Autogen is a tool designed to simplify the creation and maintenance of programs that contain large amounts of repetitious text. Unfortunately, the source is full of pregenerated files that require autogen to rebuild.
We will use gnu-autogen-bootstrapping project to rebuild those and create slightly crippled autogen that is then able to build full-featured version.
123 musl 1.2.3
With GCC and binutils supporting a musl-based toolchain natively, musl itself is rebuilt with support for dynamic linking.
124 python 2.0.1
Everything is in place to bootstrap the useful programming language/utility Python. While Python is largely written in C, many parts of the codebase are generated from Python scripts, which only increases as Python matured over time.
We begin with Python 2.0.1, which has minimal generated code, most of which can be removed. Lib/{keyword,token,symbol} scripts are rewritten in C and used to regenerate parts of the standard library. Unicode support and sre (regex) support is stripped out.
Using the stripped-down first version of Python 2.0.1, Python 2.0.1 is rebuilt, including Unicode and regex support (required for future Python builds). The first version is insufficient to run the Lib/{keyword,token,symbol} scripts, so those continue to use the C versions.
Precompiled Python code at this point is highly unreproducible, so it is deleted (JIT compiled instead). This makes Python itself slower, but this is of little consequence.
125 python 2.3.7
Python 2.0.1 is sufficient to build Python 2.3.7.
Differences to 2.0.1:
- The new "ast" module, performing parsing of Python, is generated from a parsing specification using Python code.
- 2.0.1 is insufficient to run 2.3.7's unicode regeneration, so Unicode support is again stripped out.
Python 2.3.7 is then rebuilt to include Unicode support.
126 python 2.5.6
Python 2.3.7 is sufficient to build Python 2.5.6, with a few minimal changes to language constructs in scripts. This is the last 2.x version we build.
Differences to 2.3.7 are very minimal.
127 python 3.1.5
Python 2.5.6 is new enough to be able to build Python 3.1.5, allowing us to move into the modern 3.x series of Python. Various patching is required, as some scripts in the tree are still Python 2 while others are Python 3. We have to convert the Python 3 ones back to Python 2 to be able to use Python 2.5.6.
Differences to 2.5.6:
- An include cycle when a distributed file is removed arises, we have to jump through some hoops to make this work.
- At the second pass of building, various charset encodings can be regenerated & used in the standard library (required in future Python 3.x).
- The new ssl Python library is disabled due to our OpenSSL version being too new.
Python 3.1.5 is rebuilt, using Python 3 for the Python 3 scripts in the tree.
128 python 3.3.7
Python 3.1.5 is sufficient to build Python 3.3.7 (rapid language change = small jumps).
Differences to 3.1.5:
- The ssl Python library can now be re-enabled, and _ssl_data.h regenerated.
129 python 3.4.10
Python 3.3.7 is sufficient to build Python 3.4.10.
Differences to 3.3.7:
- The clinic tool has been introduced, which unifies documentation with code. Clinic creates many generated files. We run the clinic tool across all files using clinic.
- The ssl library breaks in much more ugly ways than before, but unlike previous versions, it passes over this error silently.
130 python 3.8.16
Python 3.4.10 is sufficient to build Python 3.8.16.
Differences to 3.4.10:
- The build system has been significantly revamped (coming in line with modern standards).
- Many of our previous regenerations can be replaced with one make regen-all invocation.
- The stringprep Python module, previously deleted, is now required, so it is regenerated.
131 python 3.11.1
The newest version of Python, Python 3.11.1 can now be built.
Differences to 3.8.16:
- Unfortunately, the build system has regressed slightly. We must choose the order to perform regenerations in the Makefile ourselves, as some regenerations use other regenerations, but the Makefile does not include them as dependencies.
- The concept of "frozen" modules has been introduced, adding a layer of complexity to regeneration.
- stdlib_module_names.h is a new file that must be built using data from a current Python binary. To achieve this, a dummy stdlib_module_names.h is used for the build, then stdlib_module_names.h is created, and Python is rebuilt using the proper stdlib_module_names.h. Unfortunately this greatly increases the time taken to build Python, but it is not trivial to work around.
- A new generated script Lib/re/_casefix.py is introduced.
- The ssl module, now unbroken, can be built again.
- Very recent Python versions allow for the use of SOURCE_DATE_EPOCH to remove determinism from precompiled Python libraries (.pyc). Finally, we can re-enable compiling of Python modules.