bjoernager/rust
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Rollup merge of #115358 - durin42:compress-debuginfo, r=oli-obk

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debuginfo: add compiler option to allow compressed debuginfo sections

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.
This commit is contained in:
Matthias Krüger 2023-09-09 00:28:19 +02:00 • committed by GitHub
commit aa78b4c368
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10 changed files with 132 additions and 6 deletions
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11
compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
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@ -410,6 +410,7 @@ extern "C" LLVMTargetMachineRef LLVMRustCreateTargetMachine(
bool RelaxELFRelocations,
bool UseInitArray,
const char *SplitDwarfFile,
const char *DebugInfoCompression,
bool ForceEmulatedTls,
const char *ArgsCstrBuff, size_t ArgsCstrBuffLen) {
@ -441,6 +442,16 @@ extern "C" LLVMTargetMachineRef LLVMRustCreateTargetMachine(
if (SplitDwarfFile) {
Options.MCOptions.SplitDwarfFile = SplitDwarfFile;
}
#if LLVM_VERSION_GE(16, 0)
if (!strcmp("zlib", DebugInfoCompression) && llvm::compression::zlib::isAvailable()) {
Options.CompressDebugSections = DebugCompressionType::Zlib;
} else if (!strcmp("zstd", DebugInfoCompression) && llvm::compression::zstd::isAvailable()) {
Options.CompressDebugSections = DebugCompressionType::Zstd;
} else if (!strcmp("none", DebugInfoCompression)) {
Options.CompressDebugSections = DebugCompressionType::None;
}
#endif
Options.RelaxELFRelocations = RelaxELFRelocations;
Options.UseInitArray = UseInitArray;