[Pragma] Add backwards compatibility for 'cilk grainsize = ...' synta…

…x. Thanks to @skuntz for the essential code for this patch. This commit partially addresses wsmoses/Tapir-LLVM#90.
wsmoses · Oct 22, 2019 · 1be7d6c · 1be7d6c
1 parent 581ce50
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diff --git a/include/clang/Basic/DiagnosticParseKinds.td b/include/clang/Basic/DiagnosticParseKinds.td
@@ -1077,6 +1077,9 @@ def err_pragma_cilk_grainsize_missing_argument : Error<
 def warn_cilk_for_following_grainsize: Warning<
   "'#pragma cilk' ignored, because it is not followed by a '_Cilk_for' loop">,
   InGroup<SourceUsesCilkPlus>;
+def warn_pragma_cilk_grainsize_equals: Warning<
+  "'#pragma cilk grainsize' no longer requires '='">,
+  InGroup<SourceUsesCilkPlus>;
 
 // OpenMP support.
 def warn_pragma_omp_ignored : Warning<

diff --git a/lib/Parse/ParsePragma.cpp b/lib/Parse/ParsePragma.cpp
@@ -2876,6 +2876,13 @@ void PragmaCilkHintHandler::HandlePragma(Preprocessor &PP,
     }
     PP.Lex(Tok);
 
+    // Handle = for backwards compatibility
+    bool GrainsizeEq = Tok.is(tok::equal);
+    if (GrainsizeEq) {
+      PP.Diag(Tok.getLocation(), diag::warn_pragma_cilk_grainsize_equals);
+      PP.Lex(Tok);
+    }
+
     // Read '(' if it exists.
     bool ValueInParens = Tok.is(tok::l_paren);
     if (ValueInParens)