[clang] [Clang][NFC] Enumerate Clang abi versions in a separate header file (PR #151995)

[Aaron Ballman via cfe-commits]

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@@ -4482,32 +4453,16 @@ bool CompilerInvocation::ParseLangArgs(LangOptions &Opts, ArgList &Args,
                    !VerParts.second.getAsInteger(10, Minor)
              : VerParts.first.size() == Ver.size() || VerParts.second == "0")) {
       // Got a valid version number.
-      if (Major == 3 && Minor <= 8)
-        Opts.setClangABICompat(LangOptions::ClangABI::Ver3_8);
-      else if (Major <= 4)
-        Opts.setClangABICompat(LangOptions::ClangABI::Ver4);
-      else if (Major <= 6)
-        Opts.setClangABICompat(LangOptions::ClangABI::Ver6);
-      else if (Major <= 7)
-        Opts.setClangABICompat(LangOptions::ClangABI::Ver7);
-      else if (Major <= 9)
-        Opts.setClangABICompat(LangOptions::ClangABI::Ver9);
-      else if (Major <= 11)
-        Opts.setClangABICompat(LangOptions::ClangABI::Ver11);
-      else if (Major <= 12)
-        Opts.setClangABICompat(LangOptions::ClangABI::Ver12);
-      else if (Major <= 14)
-        Opts.setClangABICompat(LangOptions::ClangABI::Ver14);
-      else if (Major <= 15)
-        Opts.setClangABICompat(LangOptions::ClangABI::Ver15);
-      else if (Major <= 17)
-        Opts.setClangABICompat(LangOptions::ClangABI::Ver17);
-      else if (Major <= 18)
-        Opts.setClangABICompat(LangOptions::ClangABI::Ver18);
-      else if (Major <= 19)
-        Opts.setClangABICompat(LangOptions::ClangABI::Ver19);
-      else if (Major <= 20)
-        Opts.setClangABICompat(LangOptions::ClangABI::Ver20);
+#define ABI_VER_MAJOR_MINOR(Major_, Minor_)                                    \
+  if (std::tie(Major, Minor) <= std::tuple(Major_, Minor_))                    \
+    Opts.setClangABICompat(LangOptions::ClangABI::Ver##Major_##_##Minor_);     \
+  else
+#define ABI_VER_MAJOR(Major_)                                                  \
+  if (Major <= Major_)                                                         \
+    Opts.setClangABICompat(LangOptions::ClangABI::Ver##Major_);                \
+  else
+#include "clang/Basic/ABIVersions.def"
+      {} // sub-statement of the last else branch
----------------
AaronBallman wrote:

I wish we had some better way of writing this, but I've not come up with anything. :-)

https://github.com/llvm/llvm-project/pull/151995