[PATCH] D133092: [clang] fix generation of .debug_aranges with LTO

[Azat Khuzhin via Phabricator via cfe-commits]

azat created this revision.
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Right now in case of LTO the section is not emited:

  $ cat test.c
  void __attribute__((optnone)) bar()
  {
  }
  void __attribute__((optnone)) foo()
  {
          bar();
  }
  int main()
  {
          foo();
  }
  
  $ clang -flto=thin -gdwarf-aranges -g -O3 test.c
  $ eu-readelf -waranges a.out  | fgrep -c -e foo -e bar
  0
  
  $ clang -gdwarf-aranges -g -O3 test.c
  $ eu-readelf -waranges a.out  | fgrep -c -e foo -e bar
  2

Fix this by passing explicitly -mllvm -generate-arange-section.

P.S. although this looks like a hack, since none of -mllvm was passed to
the lld before.

Signed-off-by: Azat Khuzhin <a.khuzhin at semrush.com>
Suggested-by: OCHyams <orlando.hyams at sony.com>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D133092

Files:
  clang/lib/Driver/ToolChains/CommonArgs.cpp


Index: clang/lib/Driver/ToolChains/CommonArgs.cpp
===================================================================
--- clang/lib/Driver/ToolChains/CommonArgs.cpp
+++ clang/lib/Driver/ToolChains/CommonArgs.cpp
@@ -506,6 +506,9 @@
             Suffix,
         Plugin);
     CmdArgs.push_back(Args.MakeArgString(Plugin));
+  } else if (Args.hasArg(options::OPT_gdwarf_aranges)) {
+    CmdArgs.push_back(Args.MakeArgString("-mllvm"));
+    CmdArgs.push_back(Args.MakeArgString("-generate-arange-section"));
   }
 
   // Try to pass driver level flags relevant to LTO code generation down to


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