When building with -DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON the compiler-rt
CMake configuration attempts to use CMAKE_*_COMPILER_TARGET variables,
which are usually only defined in cross-compilation mode.
You can build (partially) with LLVM toolchain using the useLLVM flag.
This works like so:
nix-build -A hello --arg crossSystem '{ system =
"aarch64-unknown-linux-musl"; useLLVM = true }'
also don’t separate debug info in lldClang
It doesn’t work currently with that setup hook. Missing build-id?
LLVM should be target independent because it will work with all
machine types. This is different from GCC where it needs to know what
target to build ahead of time.
* llvm: build w/polly in-tree, optionally
Don't enable by default yet, defer rebuilds.
* top-level: llvm-polly, clang-polly
* bit hacky re:overrides
* need to explicitly set cmake flags for clang to link in polly
clang needs to find headers + libraries for compiling with libc++. We
need to add a libcxx argument to cc-wrapper. This means you do not
have to pass in c++ headers directly.
This resolves the last case remaining of #30670. Darwin clang++ now
works properly.
Fixes#30670
This makes LLVM tools (including dependent tools such as LLD) readily useful in
more situations, foresees such needed additions as BPF and NVPTX, and brings
llvm_6 and newer on par with the current default llvm_5.
* add generic x86_32 support
- Add support for i386-i586.
- Add `isx86_32` predicate that can replace most uses of `isi686`.
- `isi686` is reinterpreted to mean "exactly i686 arch, and not say i585 or i386".
- This branch was used to build working i586 kernel running on i586 hardware.
* revert `isi[345]86`, remove dead code
- Remove changes to dead code in `doubles.nix` and `for-meta.nix`.
- Remove `isi[345]86` predicates since other cpu families don't have specific model predicates.
* remove i386-linux since linux not supported on that cpu
LLVM’s `LLVM_TARGETS_TO_BUILD` build flag defauls to `all`, which contains
`AMDGPU` among others. [1] Changes in llvm [2] switched to explicitly listing
host and target platforms, excluding the AMDGPU target, which is required
for Mesa to build.
[1]: db50b6fe39/CMakeLists.txt (L286-L302)
[2]: https://github.com/NixOS/nixpkgs/pull/52031
This is necessary to avoid objc errors like:
"_OBJC_CLASS_$_NSDictionary", referenced from:
objc-class-ref in liblldbHost.a(HostInfoMacOSX.mm.o)
objc-class-ref in liblldbPluginPlatformMacOSX.a(PlatformiOSSimulatorCoreSimulatorSupport.mm.o)
ld: symbol(s) not found for architecture x86_64
