Previously, we linked in the ROCm device libraries which provide math
and other utility functions late. This is not stricly correct as this
library contains several flags that are only set per-TU, such as fast
math or denormalization. This patch changes this to pass the bitcode
libraries per-TU using the same method we use for the CUDA libraries.
This has the advantage that we correctly propagate attributes making
this implementation more correct. Additionally, many annoying unused
functions were not being fully removed during LTO. This lead to
erroneous warning messages and remarks on unused functions.
I am not sure if not finding these libraries should be a hard error. let
me know if it should be demoted to a warning saying that some device
utilities will not work without them.
Reviewed By: JonChesterfield
Differential Revision: https://reviews.llvm.org/D133726
Recently OpenMP has transitioned to using the "new" driver which
primarily merges the device and host linking phases into a single
wrapper that handles both at the same time. This replaced a few tools
that were only used for OpenMP offloading, such as the
`clang-offload-wrapper` and `clang-nvlink-wrapper`. The new driver
carries some marked benefits compared to the old driver that is now
being deprecated. Things like device-side LTO, static library
support, and more compatible tooling. As such, we should be able to
completely deprecate the old driver, at least for OpenMP. The old driver
support will still exist for CUDA and HIP, although both of these can
currently be compiled on Linux with `--offload-new-driver` to use the new
method.
Note that this does not deprecate the `clang-offload-bundler`, although
it is unused by OpenMP now, it is still used by the HIP toolchain both
as their device binary format and object format.
When I proposed deprecating this code I heard some vendors voice
concernes about needing to update their code in their fork. They should
be able to just revert this commit if it lands.
Reviewed By: jdoerfert, MaskRay, ye-luo
Differential Revision: https://reviews.llvm.org/D130020
This fixes the 'unused linker option: -lm' warning when compiling
program with -c.
Reviewed By: JonChesterfield
Differential Revision: https://reviews.llvm.org/D107952
This patch adds AMDGPUOpenMPToolChain for supporting OpenMP
offloading to AMD GPU's.
Originally authored by Greg Rodgers
Reviewed By: jdoerfert
Differential Revision: https://reviews.llvm.org/D94961
Joseph Huber