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

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.

1 files changed, 11 insertions, 0 deletions

diff --git a/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
index 09627e1cfed..fefb1e0fbe0 100644
--- a/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
+++ b/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
@@ -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;