binutils: avoid texinfo dependency during bootstrap #210132
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ghost
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Jan 13, 2023
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Normally binutils provides pregenerated manuals along with release
tarball. Manuals regeneration is needed every time we change
`configure.ac`. But usually there are no material changes in it.
This change instead inhibits manuals regeenration by keeping
man and info files up to date.
The diff of bootstrap tree before and after the change:
$ nix-store --query --graph $(nix-instantiate -A stdenv) |
fgrep ' -> ' | awk '{print $3}' | sort -u |
sed 's/"[0-9a-z]\{32\}-/"/g' | sort > before
$ nix-store --query --graph $(nix-instantiate -A stdenv) |
fgrep ' -> ' | awk '{print $3}' | sort -u |
sed 's/"[0-9a-z]\{32\}-/"/g' | sort > after
$ diff -U0 before after
--- before
+++ after
@@ -100 +99,0 @@
-"texinfo-6.8.drv"
Co-authored-by: Adam Joseph <54836058+amjoseph-nixpkgs@users.noreply.github.com>
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Artturin
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Jan 14, 2023
|
|
||
| # autoreconfHook is not included for all targets. | ||
| # Call it here explicitly as well. | ||
| ${finalAttrs.postAutoreconf} |
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✔️ it should be okay to run the touch commands twice
wegank
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Feb 1, 2023
#### Immediate Benefits
- Allow `gcc11` on `aarch64`
- No more copying `libgcc_s` out of the bootstrap-files or other
derivations
- No more [static `lib{mpfr,mpc,gmp,isl}.a`
hack](https://github.com/NixOS/nixpkgs/blob/2f1948af9c984ebb82dfd618e67dc949755823e2/pkgs/stdenv/linux/default.nix#L380)
- *Zero* additional `gcc` builds (stage1+stage2+stageCompare)
- The `gcc` derivation builds `gcc` once instead of three times.
- The libraries that are linked into the final `pkgs.gcc` (`mpfr`,
`mpc`, `gmp`, `isl`, `glibc`) are built by
`stdenv.__bootPkgs.gcc` rather than by the `bootstrapFiles`. No
more Frankenstein compiler!
- stageCompare runs **concurrently** with (not in series with)
with `stdenv`'s dependees.
- Many other `stdenv` hacks eliminated.
- `gcc` and `clang` share the same codepath for more of
`cc-wrapper`.
- Makes the cross and native codepaths much more similar --
another step towards "cross by default".
Note that *all* the changes in this PR are controlled by flags; no
old codepaths need to be removed until/if we're completely certain
that this is the right way to go.
#### Future Benefits
- This should allow using a [foreign] `bootstrap-files` so long as
`hostPlatform.canExecute bootstrapFiles`.
- There will be an "avalanche of simplification" when we set
`enableGccExternalBootstrap=true` and run dead code elimination.
It's really quite a huge amount of code that goes away.
Native-gcc has its own special codepath in so many places, while
cross-gcc and clang work the same way (and are much simpler).
- This should allow each of the libraries that ship with `gcc`
(`lib{backtrace,atomic,cc1,decnumber,ffi,gomp,iberty,offloadatomic,quadmath,sanitizer,ssp,stdc++-v3,vtv}`)
to be built in separate (one-liner) derivations which `inherit
src;` from `gcc`.
- Building `libstdc++-v3` in a separate derivation will eliminate
a lot of accidental-reference-to-the-`bootstrapFiles` landmines.
#### Incorporates
- NixOS#209054
- NixOS#210004
- NixOS#36948 (unreverted)
- NixOS#210325
- NixOS#210118
- NixOS#210132
- NixOS#210109
#### Closes
- Closes NixOS#208412
- Closes NixOS#108111
- Closes NixOS#108305
- Closes NixOS#201254
#### Build history
- First successful builds (stage1/stage2):
- powerpc64le-linux at 9c7e9ef
- x86_64-linux at 9c7e9ef
- aarch64-linux at 4d5bc7d
- First successful comparisons (stageCompare):
- at 81949cf
- [aarch64-linux][aarch64-compare-ofborg]
- [x86\_64-linux][amd64-compare-ofborg]
#### Credits
This project was made possible by three important insights, none of
which were mine:
1. @Ericson2314 was the first to advocate for this change, and
probably the first to appreciate its advantages. External
bootstrap is "cross by default".
2. @trofi has figured out a lot about how to get gcc to not mix up
the copy of `libstdc++` that it depends on with the copy that it
builds. Now that gcc is written in C++, it depends on
`libstdc++`, builds a copy of `libstdc++`, and builds auxiliary
products (like `libplugin`) which depend on `libstdc++`. @trofi
developed two important techniques for keeping this straight: the
use of a [nonexistent sysroot] and moving the `bootstrapFiles`'
`libstdc++` into a [versioned directory]. Without these two
discoveries, external bootstrap would be impossible, because the
final gcc would still have references to the `bootstrapFiles`.
3. Using the undocumented variable [`user-defined-trusted-dirs`]
when building glibc. When glibc `dlopen()`s `libgcc_s.so`, it
uses a completely different and totally special set of rules for
finding `libgcc_s.so`. This trick is the only way we can put
`libgcc_s.so` in its own separate outpath without creating
circular dependencies or dependencies on the bootstrapFiles. I
would never have guessed to use this (or that it existed!) if it
were not for a [comment in guix] which @Mic92 [mentioned].
My own role in this PR was basically: being available to go on a
coding binge at an opportune moment, so we wouldn't waste a
[crisis].
[aarch64-compare-ofborg]: https://github.com/NixOS/nixpkgs/pull/209870/checks?check_run_id=10662822938
[amd64-compare-ofborg]: https://github.com/NixOS/nixpkgs/pull/209870/checks?check_run_id=10662825857
[nonexistent sysroot]: NixOS#210004
[versioned directory]: NixOS#209054
[`user-defined-trusted-dirs`]: https://sourceware.org/legacy-ml/libc-help/2013-11/msg00026.html
[comment in guix]: https://github.com/guix-mirror/guix/blob/5e4ec8218142eee8e6e148e787381a5ef891c5b1/gnu/packages/gcc.scm#L253
[mentioned]: NixOS#210112 (comment)
[crisis]: NixOS#108305
[foreign]: NixOS#170857 (comment)
tm-drtina
pushed a commit
to awakesecurity/nixpkgs
that referenced
this pull request
Apr 27, 2024
#### Summary
By default, when you type `make`, GCC will compile itself three
times. This PR inhibits that behavior by configuring GCC with
`--disable-bootstrap`, and reimplements the triple-rebuild using
Nix rather than `make`/`sh`.
#### Immediate Benefits
- Allow `gcc11` and `gcc12` on `aarch64` (without needing new
`bootstrapFiles`)
- Faster stdenv rebuilds: the third compilation of gcc
(i.e. stageCompare) is no longer a `drvInput` of the final stdenv.
This allows Nix to build stageCompare in parallel with the rest of
nixpkgs instead of in series.
- No more copying `libgcc_s` out of the bootstrap-files or other
derivations
- No more Frankenstein compiler: the final gcc and the libraries it
links against (mpfr, mpc, isl, glibc) are all built by the same
compiler (xgcc) instead of a mixture of the bootstrapFiles'
compiler and xgcc.
- No more [static lib{mpfr,mpc,gmp,isl}.a hack]
- Many other small `stdenv` hacks eliminated
- `gcc` and `clang` share the same codepath for more of `cc-wrapper`.
#### Future Benefits
- This should allow using a [foreign] `bootstrap-files` so long as
`hostPlatform.canExecute bootstrapFiles`.
- This should allow each of the libraries that ship with `gcc`
(lib{backtrace, atomic, cc1, decnumber, ffi, gomp, iberty,
offloadatomic, quadmath, sanitizer, ssp, stdc++-v3, vtv}) to be
built in separate (one-liner) derivations which `inherit src;`
from `gcc`, much like NixOS#132343
#### Incorporates
- NixOS#210004
- NixOS#36948 (unreverted)
- NixOS#210325
- NixOS#210118
- NixOS#210132
- NixOS#210109
- NixOS#213909
- NixOS#216136
- NixOS#216237
- NixOS#210019
- NixOS#216232
- NixOS#216016
- NixOS#217977
- NixOS#217995
#### Closes
- Closes NixOS#108305
- Closes NixOS#108111
- Closes NixOS#201254
- Closes NixOS#208412
#### Credits
This project was made possible by three important insights, none of
which were mine:
1. @Ericson2314 was the first to advocate for this change, and
probably the first to appreciate its advantages. Nix-driven
(external) bootstrap is "cross by default".
2. @trofi has figured out a lot about how to get gcc to not mix up
the copy of `libstdc++` that it depends on with the copy that it
builds, by moving the `bootstrapFiles`' `libstdc++` into a
[versioned directory]. This allows a Nix-driven bootstrap of gcc
without the final gcc would still having references to the
`bootstrapFiles`.
3. Using the undocumented variable [`user-defined-trusted-dirs`]
when building glibc. When glibc `dlopen()`s `libgcc_s.so`, it
uses a completely different and totally special set of rules for
finding `libgcc_s.so`. This trick is the only way we can put
`libgcc_s.so` in its own separate outpath without creating
circular dependencies or dependencies on the bootstrapFiles. I
would never have guessed to use this (or that it existed!) if it
were not for a [comment in guix] which @Mic92 [mentioned].
My own role in this PR was basically: being available to go on a
coding binge at an opportune moment, so we wouldn't waste a
[crisis].
[aarch64-compare-ofborg]: https://github.com/NixOS/nixpkgs/pull/209870/checks?check_run_id=10662822938
[amd64-compare-ofborg]: https://github.com/NixOS/nixpkgs/pull/209870/checks?check_run_id=10662825857
[nonexistent sysroot]: NixOS#210004
[versioned directory]: NixOS#209054
[`user-defined-trusted-dirs`]: https://sourceware.org/legacy-ml/libc-help/2013-11/msg00026.html
[comment in guix]: https://github.com/guix-mirror/guix/blob/5e4ec8218142eee8e6e148e787381a5ef891c5b1/gnu/packages/gcc.scm#L253
[mentioned]: NixOS#210112 (comment)
[crisis]: NixOS#108305
[foreign]: NixOS#170857 (comment)
[static lib{mpfr,mpc,gmp,isl}.a hack]: https://github.com/NixOS/nixpkgs/blob/2f1948af9c984ebb82dfd618e67dc949755823e2/pkgs/stdenv/linux/default.nix#L380
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Normally binutils provides pregenerated manuals along with release tarball. Manuals regeneration is needed every time we change
configure.ac. But usually there are no material changes in it.This change instead inhibits manuals regeenration by keeping man and info files up to date.
The diff of bootstrap tree before and after the change:
Description of changes
Things done
sandbox = trueset innix.conf? (See Nix manual)nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage./result/bin/)nixos/doc/manual/md-to-db.shto update generated release notes