[clang] [flang] [flang][debug] Add compressed DWARF support in Flang (PR #212584)

[Tarun Prabhu via cfe-commits]

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@@ -174,6 +174,23 @@ static bool parseDebugArgs(Fortran::frontend::CodeGenOptions &opts,
   opts.DebugInfoForProfiling =
       args.hasArg(clang::options::OPT_fdebug_info_for_profiling);
 
+  if (const llvm::opt::Arg *a =
+          args.getLastArg(clang::options::OPT_compress_debug_sections_EQ)) {
+    auto type = llvm::StringSwitch<std::optional<llvm::DebugCompressionType>>(
+                    a->getValue())
+                    .Case("none", llvm::DebugCompressionType::None)
+                    .Case("zlib", llvm::DebugCompressionType::Zlib)
+                    .Case("zstd", llvm::DebugCompressionType::Zstd)
+                    .Default(std::nullopt);
+    if (type) {
+      opts.setCompressDebugSections(*type);
+    } else {
+      diags.Report(clang::diag::err_drv_invalid_value)
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tarunprabhu wrote:

We probably don't need to diagnose this here. The driver will have diagnosed this already and ensure that only valid values get passed here. `-fc1` is not intended for end-users, so it is ok to assume that the options passed to it are valid.

https://github.com/llvm/llvm-project/pull/212584