[PATCH] D145726: Fix assembler error when -g and -gdwarf-* is passed with -fno-integrated-as.

[Nick Desaulniers via Phabricator via cfe-commits]

nickdesaulniers added inline comments.


================
Comment at: clang/lib/Driver/ToolChains/Gnu.cpp:978-986
+      if (Arg *A = Args.getLastArg(options::OPT_g_Flag, options::OPT_gN_Group,
+                                   options::OPT_gdwarf_2, options::OPT_gdwarf_3,
+                                   options::OPT_gdwarf_4, options::OPT_gdwarf_5,
+                                   options::OPT_gdwarf))
+        if (!A->getOption().matches(options::OPT_g0)) {
+          Args.AddLastArg(CmdArgs, options::OPT_g_Flag);
+          unsigned DwarfVersion = getDwarfVersion(getToolChain(), Args);
----------------
nickdesaulniers wrote:
> garvitgupta08 wrote:
> > nickdesaulniers wrote:
> > > Isn't this potentially going to add `-gdwarf-` repeatedly if there's many inputs?
> > > 
> > > Wouldn't it be better to scan the inputs to see if there's any .S or .s files, then add the flags once?
> > Let me know if this is fine.
> I don't think the current implementation addresses my point.  Having `CmdArgs.push_back` be called in a loop on the number of inputs will potentially add the arg repeatedly.
> 
> I think you should simply check if the `InputType` is asm or asm-with-cpp in the loop, potentially setting a boolean scoped outside the loop. Then, after the loop, decide whether to add the cmd arg.
Specifically, if `llvm::any_of` the inputs are asm or asm-with-cpp, then we might want to modify the command line flags passed to the external assembler.

We don't want to pass additional flags per input.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D145726/new/

https://reviews.llvm.org/D145726