Author: rsmith
Date: Mon Oct 31 15:25:52 2016
New Revision: 285631
URL: http://llvm.org/viewvc/llvm-project?rev=285631&view=rev
Log:
Add comment explaining this mysterious macro name.
Modified:
cfe/trunk/lib/Frontend/InitPreprocessor.cpp
Modified: cfe/trunk/lib/Frontend/InitPreprocessor.cpp
URL:
http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Frontend/InitPreprocessor.cpp?rev=285631&r1=285630&r2=285631&view=diff
==============================================================================
--- cfe/trunk/lib/Frontend/InitPreprocessor.cpp (original)
+++ cfe/trunk/lib/Frontend/InitPreprocessor.cpp Mon Oct 31 15:25:52 2016
@@ -992,6 +992,9 @@ static void InitializePredefinedMacros(c
}
if (TI.hasInt128Type() && LangOpts.CPlusPlus && LangOpts.GNUMode) {
+ // For each extended integer type, g++ defines a macro mapping the
+ // index of the type (0 in this case) in some list of extended types
+ // to the type.
Builder.defineMacro("__GLIBCXX_TYPE_INT_N_0", "__int128");
Builder.defineMacro("__GLIBCXX_BITSIZE_INT_N_0", "128");
}
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