For a cross-built native compiler, i.e. build!=(host==target), the
bundled libgfortran needs a gfortran which can run on the
buildPlatform and emit code for the targetPlatform. The compiler
which is built alongside gfortran in this configuration doesn't meet
that need: it runs on the hostPlatform.
This commit passes the necessary compiler via `GFORTRAN_FOR_TARGET`,
using `pkgsBuildTarget.gfortran`.
Cross-compiled binaries currently end up with two different libgcc
outpaths in their closure. This is harmless, but confusing.
The two libgccs are:
- One of them is the "first" targetPlatform libgcc, which is built
by the "first" cross-compiler. This "first libgcc" and "first
compiler" are used to build the targetPlatform glibc.
- Once glibc is built, we *rebuild* the cross-compiler, since gcc
can't enable most of its features unless you give it an
already-compiled targetPlatform glibc. When this "second"
compiler is built, it also builds an extra copy of libgcc.
This commit discards the second, extra libgcc, and instead puts a
reference to the first (correct) libgcc into the "second compiler"
`.passthru.libgcc`, so that anybody expecting `stdenv.cc.cc.libgcc`
to exist will still find it there.
Closes#249680
msvcrt is only one of the libcs in MinGW. We therefore
replace explictly testing for msvcrt with the isMinGW
predicate. This lays the foundation for ucrt64 support.
Without the change build on mips64-unknown-linux-gnu fails as:
$ nix-build -A buildPackages.gcc12 --argstr crossSystem mips64-linux
In file included from ...-glibc-mips64-unknown-linux-gnu-2.37-8-dev/include/bits/stat.h:25,
from ...-glibc-mips64-unknown-linux-gnu-2.37-8-dev/include/fcntl.h:78,
from ../../../../gcc-12.3.0/libsanitizer/sanitizer_common/sanitizer_linux.cpp:55:
...-glibc-mips64-unknown-linux-gnu-2.37-8-dev/include/bits/struct_stat.h:190:8: error: redefinition of 'struct stat64'
190 | struct stat64
| ^~~~~~
This PR sorts the huge pile of patches and deduplicates it. Unlike
its predecessors https://github.com/NixOS/nixpkgs/pull/249707 and
https://github.com/NixOS/nixpkgs/pull/250489 this commit *does*
affect eval.
Patches below are organized into three general categories:
1. Patches relevant to gcc>=12 on every platform
2. Patches relevant to gcc>=12 on specific platforms
3. Patches relevant only to gcc<12, sorted by the newest version to
which they might be relevant
