rust/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp, branch 1.77.1

fix: stop emitting `.debug_pubnames` and `.debug_pubtypes`

2023-12-11T19:58:02+00:00

`.debug_pubnames` and `.debug_pubtypes` are poorly designed and people seldom use them. However, they take a considerable portion of size in the final binary. This tells LLVM stop emitting those sections on DWARFv4 or lower. DWARFv5 use `.debug_names` which is more concise in size and performant for name lookup.

Add `-Zfunction-return={keep,thunk-extern}` option

2023-11-30T19:21:31+00:00

This is intended to be used for Linux kernel RETHUNK builds. With this commit (optionally backported to Rust 1.73.0), plus a patched Linux kernel to pass the flag, I get a RETHUNK build with Rust enabled that is `objtool`-warning-free and is able to boot in QEMU and load a sample Rust kernel module. Signed-off-by: Miguel Ojeda

Update the minimum external LLVM to 16.

2023-11-21T21:40:16+00:00

Auto merge of #117948 - aeubanks:dibuilder, r=durin42

2023-11-16T03:14:51+00:00

llvm-wrapper: Pass newly added param to DIBuilder::createStaticMemberType() This was added in https://github.com/llvm/llvm-project/pull/72234. DW_TAG_member was the implicit default before. The LLVM change is quite sinister since due to weakly typed ints and default params, this was still successfully compiling against LLVM but was passing the wrong parameters.

llvm-wrapper: Pass newly added param to DIBuilder::createEnumerationType()

2023-11-15T22:42:53+00:00

Added in LLVM in https://github.com/llvm/llvm-project/pull/72011.

17 -> 18

2023-11-15T21:15:55+00:00

[llvm-wrapper] Pass newly added param to DIBuilder::createStaticMemberType()

2023-11-15T19:29:35+00:00

This was added in https://github.com/llvm/llvm-project/pull/72234. DW_TAG_member was the implicit default before.

debuginfo: add compiler option to allow compressed debuginfo sections

2023-09-08T14:45:29+00:00

LLVM already supports emitting compressed debuginfo. In debuginfo=full builds, the debug section is often a large amount of data, and it typically compresses very well (3x is not unreasonable.) We add a new knob to allow debuginfo to be compressed when the matching LLVM functionality is present. Like clang, if a known-but-disabled compression mechanism is requested, we disable compression and emit uncompressed debuginfo sections. The API is different enough on older LLVMs we just pretend the support is missing on LLVM older than 16.

Rollup merge of #113593 - rcvalle:rust-cfi-fix-90546, r=wesleywiser

2023-08-08T19:44:43+00:00

CFI: Fix error compiling core with LLVM CFI enabled Fix #90546 by filtering out global value function pointer types from the type tests, and adding the LowerTypeTests pass to the rustc LTO optimization pipelines.

Only enable hotness information when PGO is available

2023-08-08T13:36:55+00:00