phosek added inline comments.
================
Comment at: runtimes/CMakeLists.txt:168
+if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+ set(CXX_TARGET_TRIPLE ${CMAKE_CXX_COMPILER} --target=${LLVM_RUNTIME_TRIPLE}
-print-target-triple)
+ execute_process(COMMAND ${CXX_TARGET_TRIPLE}
----------------
tamas wrote:
> I think there is one downside to this: the `normalize` function will not, in
> fact, normalize alternative spellings for equivalent architectures (and
> likely other components, I haven't checked that):
> ```
> + clang -print-target-triple -target amd64-unknown-linux-musl
> amd64-unknown-linux-musl
> + clang -print-target-triple -target x86_64-unknown-linux-musl
> x86_64-unknown-linux-musl
> ```
> So the issue where the distribution build can install runtimes in paths that
> won't be found by the driver still remains
> (https://github.com/llvm/llvm-project/issues/57781). One way to fix this
> could be adding a new switch that does a more opinionated normalization (for
> example, always picks `x86_64` in the above). Sort of a reverse for
> `Triple::parseArch` etc. where it always returns one certain spelling when
> there are multiple common alternatives. Alternatively, `normalize` could be
> changed to do this, but that might subtle breaking consequences for users
> which are hard to foresee.
I think this is an orthogonal issue to the one that this change is trying to
address. Clang currently uses normalized triples to for its include directories
(libc++ headers) and runtime libraries. This change ensures that the triple
spelling used by CMake and Clang matches, but it doesn't change the
normalization logic.
From Clang's perspective, `amd64-unknown-linux-musl` and
`x86_64-unknown-linux-musl` are two different triples and so it'd use different
search directories. We could consider changing the normalization rules to
normalize these to the same triple, but that should be done separately (and
would likely require further discussion to understand the potential
consequences of such a change).
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D140925/new/
https://reviews.llvm.org/D140925
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