I made a mistake merge. Reverting it in c778945806 undid the state
on master, but now I realize it crippled the git merge mechanism.
As the merge contained a mix of commits from `master..staging-next`
and other commits from `staging-next..staging`, it got the
`staging-next` branch into a state that was difficult to recover.
I reconstructed the "desired" state of staging-next tree by:
- checking out the last commit of the problematic range: 4effe769e2
- `git rebase -i --preserve-merges a8a018ddc0` - dropping the mistaken
merge commit and its revert from that range (while keeping
reapplication from 4effe769e2)
- merging the last unaffected staging-next commit (803ca85c20)
- fortunately no other commits have been pushed to staging-next yet
- applying a diff on staging-next to get it into that state
It's supposed to be just bugfixes. I tested building some projects with
gcc10. Also gfortran10 still builds. I don't expect issues.
This causes basically no rebuilds, as we use 9 by default.
Turns out that libgccjit gets installed as a .so file, which the gcc
builder.sh didn't change: It only touched .dylib files; that means
that anything linking in libgccjit.so would receive an "Image not
found" error at load time.
With this change, we invoke `install_name_tool` on .so files too,
adjusting their dynamic linker ID, so that they too can be found.
This adds a warning to the top of each “boot” package that reads:
Note: this package is used for bootstrapping fetchurl, and thus cannot
use fetchpatch! All mutable patches (generated by GitHub or cgit) that
are needed here should be included directly in Nixpkgs as files.
This makes it clear to maintainer that they may need to treat this
package a little differently than others. Importantly, we can’t use
fetchpatch here due to using <nix/fetchurl.nix>. To avoid having stale
hashes, we need to include patches that are subject to changing
overtime (for instance, gitweb’s patches contain a version number at
the bottom).
In some cases, such as when building cross compilers, the binaries and
manpages contain the target architecture tuple, such as
`i686-w64-mingw32-g++.1`.
Ensure the symlink created to save space with the duplicated manpage
(`g++.1 -> gcc.1`) properly handles such cases and generates symlinks
such as `i686-w64-mingw32-g++.1 -> i686-w64-mingw32-gcc.1`.
Previously in such cases, a broken `gcc.1` link would be created
instead.
reasoning:
sjlj (short jump long jump) exception handling makes no sense on x86_64, it's forcably slowing programs down as it produces a constant overhead. On x86_64 we have SEH (Structured Exception Handling) and we should use that. On i686, we do not have SEH, and have to use sjlj with dwarf2. Hence it's now conditional on x86_32
`libstdc++` and a few other libraries are comiled with the options
set in `EXTRA_TARGET_FLAGS`. Normally, this is filled form
`EXTRA_FLAGS` inside of `builder.sh`, from which it inherits its
optimization option. For cross compilers `EXTRA_TARGET_FLAGS` is
set by a dedicated function that does not specify any optimization,
leading to sub-par runtime performance of many C++ programs.
I hate the thing too even though I made it, and rather just get rid of
it. But we can't do that yet. In the meantime, this brings us more
inline with autoconf and will make it slightly easier for me to write a
pkg-config wrapper, which we need.
Everything is copied as-is from 9 (except version and hash).
Some platform-specific patches might not apply anymore;
I'm lazily leaving that for the community to fix.
This option can be used to set the “jit” language which enable the
libgccjit functionality. Also adds a “libgccjit” attr which is gcc
built with just jit enabled.
libgccjit is a library but is used as a compiler. So it references a
bunch of compiler things in $out. To avoid a cycle, we need to put
everything in $out, so referenced to $lib need to be replaced with
${!outputLib}.
MacOS 10.15 now includes "aligned_alloc". Disagreement between the
headers and the binaries about whether aligned_alloc exists leads to
a compilation failure (see #73319 and the detailed comment in this
commit).
