Make VaList contain a VaListImpl directly. #238
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…check_expr_struct_fields (cherry picked from commit 95b9ecd)
…ency and we have a trait error (cherry picked from commit 9d5d03b)
The library path is needed when the toolchain has been configured with
`[rust] rpath = false`. Otherwise, building the reference book will get
an error when it tries to run rustdoc, like:
rustdoc: error while loading shared libraries: librustc_driver-2ec457c3b8826b72.so
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LLVM does not include an implementation of the va_arg instruction for Xtensa. From what I understand, this is a conscious decision and instead language frontends are encouraged to implement it themselves. The rationale seems to be that loading values correctly requires language and ABI-specific knowledge that LLVM lacks. This is true of most architectures, and rustc already provides implementation for a number of them. This commit extends the support to include Xtensa. See https://lists.llvm.org/pipermail/llvm-dev/2017-August/116337.html for some discussion on the topic. Unfortunately there does not seem to be a reference document for the semantics of the va_list and va_arg on Xtensa. The most reliable source is the GCC implementation, which this commit tries to follow. Clang also provides its own compatible implementation. This was tested for all the types that rustc allows in variadics. Co-authored-by: Brian Tarricone <[email protected]>
* Updates uses of object::Architecture within the compiler
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This is my current workaround for this issue: extern "C" {
fn vsnprintf(s: *mut c_char, n: usize, format: *const c_char, ap: VaListImpl) -> c_int;
}Replacing what should be VaList by VaListImpl works correctly. |
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Thank you for the fix! I actually ran into this issue a few weeks ago and didn't realize it was this. I've applied your patch to the 1.82 branch and added you as a co-author of the vaarg patch so you still get credit :) |
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On Xtensa, va_list on the C side is clearly the size of 3 pointers.
It then follows that VaList should contain those pointers directly instead of containing a pointer to a VaListImpl.
This PR corrects which VaList implementation variant is used.
esp-idf-sys bindings: