[PATCH] D157794: [Driver] Make /Zi and /Z7 aliases of -g rather than handling them specially

[Justin Bogner via Phabricator via cfe-commits]

bogner added inline comments.


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Comment at: clang/test/Driver/cl-options.c:567
 
-// This test was super sneaky: "/Z7" means "line-tables", but "-gdwarf" occurs
-// later on the command line, so it should win. Interestingly the cc1 arguments
-// came out right, but had wrong semantics, because an invariant assumed by
-// CompilerInvocation was violated: it expects that at most one of {gdwarfN,
-// line-tables-only} appear. If you assume that, then you can safely use
-// Args.hasArg to test whether a boolean flag is present without caring
-// where it appeared. And for this test, it appeared to the left of -gdwarf
-// which made it "win". This test could not detect that bug.
+// If We specify both /Z7 and -gdwarf we should get dwarf, not codeview.
 // RUN: %clang_cl /Z7 -gdwarf /c -### -- %s 2>&1 | FileCheck -check-prefix=Z7_gdwarf %s
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rnk wrote:
> I think Meta folks depend on a mode that emits both codeview and DWARF. + at smeenai
Hopefully if that's the case there's a better test somewhere than this one that discusses in detail how `/Z7` is an alias for `-gline-tables-only`, which hasn't been true since 2017.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D157794/new/

https://reviews.llvm.org/D157794